笔者前段时间完成设置的圆角item风格的修改，但最近，客户新增需求，想把设置做成Tab风格的，没办法，顾客就是上帝，咱得改啊。今天算是初步改完了，趁着测试紧张测试的空隙，赶紧写写博客，梳理一下，一来是给自己记个笔记，二来希望给有需要的朋友一点帮助。
修改主要是两个点：
①.圆角item的实现。
②.Tab风格的实现。
先来看看下面粗糙的效果图：
我们都知道，Android从3.0开始加入了Fragment，这大大的减少了Activity的使用，在4.0的设置中尤其发挥的淋漓尽致，几乎整个设置应用的一级、二级设置菜单就属于一个Activity即Settings.java。我们能看到不同的设置项，其实就是更换不同的Fragment，表面上是显得很简洁明了，但是修改起来还是有点蛋疼了，一点小改动就有可能牵扯一大部分功能，引起一堆bug。
- 圆角item的实现：
其实这种圆角的item有两种类型，一种是一直都有的Preference，另外一种是从3.0开始添加的Header。比如设置的第一个主界面使用的就是Header(第一、二张图片所示)，其二级、三级菜单就是Preference(第三张图片所示)了，不管是哪种类型，他们都是基于ListView实现的，理解了这个原理，修改起来就简单了，只用在ListView的Adapter的getView函数中，修改对应item项的背景图片即可。观察圆角item的背景图片我们可以发现，先要准备四种背景图片：顶部(上圆下方)、中间(上下都方)、底部(上方下圆)和单独(上下都圆)。
由于Header和Preference还是有一点区别的，Header使用频率没有Preference高，因此，我这里就没有在framework层修改Header，只是在需要用到的地方再修改。所以重点说一下Preference。
在源码中找到：frameworks/base/core/java/android/preference/PreferenceGroupAdapter.java，这个就是Preference的Adapter，首先声明4种类型的背景，然后通过计算得知那一项需要替换成对应的背景图片，最后在getView函数中，把对应的item的背景替换成我们需要的，下面是源码，加上liweiping标签的就是我的修改：
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.preference;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import android.os.Handler;
import android.preference.Preference.OnPreferenceChangeInternalListener;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
/**
* An adapter that returns the {@link Preference} contained in this group.
* In most cases, this adapter should be the base class for any custom
* adapters from {@link Preference#getAdapter()}.
* <p>
* This adapter obeys the
* {@link Preference}'s adapter rule (the
* {@link Adapter#getView(int, View, ViewGroup)} should be used instead of
* {@link Preference#getView(ViewGroup)} if a {@link Preference} has an
* adapter via {@link Preference#getAdapter()}).
* <p>
* This adapter also propagates data change/invalidated notifications upward.
* <p>
* This adapter does not include this {@link PreferenceGroup} in the returned
* adapter, use {@link PreferenceCategoryAdapter} instead.
*
* @see PreferenceCategoryAdapter
*/
class PreferenceGroupAdapter extends BaseAdapter implements OnPreferenceChangeInternalListener {
private static final String TAG = "PreferenceGroupAdapter";
/**
* The group that we are providing data from.
*/
private PreferenceGroup mPreferenceGroup;
/**
* Maps a position into this adapter -> {@link Preference}. These
* {@link Preference}s don't have to be direct children of this
* {@link PreferenceGroup}, they can be grand children or younger)
*/
private List<Preference> mPreferenceList;
/**
* List of unique Preference and its subclasses' names. This is used to find
* out how many types of views this adapter can return. Once the count is
* returned, this cannot be modified (since the ListView only checks the
* count once--when the adapter is being set). We will not recycle views for
* Preference subclasses seen after the count has been returned.
*/
private ArrayList<PreferenceLayout> mPreferenceLayouts;
private PreferenceLayout mTempPreferenceLayout = new PreferenceLayout();
/**
* Blocks the mPreferenceClassNames from being changed anymore.
*/
private boolean mHasReturnedViewTypeCount = false;
private volatile boolean mIsSyncing = false;
private Handler mHandler = new Handler();
//start by liweiping 20130826
private ArrayList<Integer> mPreferenceListBackgroundIndex;
private final int SINGLE_LINE_ROUND_CORNER_BACKGROUND = 1;
private final int TOP_ROUND_CORNER_BACKGROUND = 2;
private final int BOTTOM_ROUND_CORNER_BACKGROUND = 3;
private final int CENTER_RECTANGLE_BACKGROUND = 4;
private final int NO_BACKGOUND = 5;
//end by liweiping 20130826
private Runnable mSyncRunnable = new Runnable() {
public void run() {
syncMyPreferences();
}
};
private static class PreferenceLayout implements Comparable<PreferenceLayout> {
private int resId;
private int widgetResId;
private String name;
public int compareTo(PreferenceLayout other) {
int compareNames = name.compareTo(other.name);
if (compareNames == 0) {
if (resId == other.resId) {
if (widgetResId == other.widgetResId) {
return 0;
} else {
return widgetResId - other.widgetResId;
}
} else {
return resId - other.resId;
}
} else {
return compareNames;
}
}
}
public PreferenceGroupAdapter(PreferenceGroup preferenceGroup) {
mPreferenceGroup = preferenceGroup;
// If this group gets or loses any children, let us know
mPreferenceGroup.setOnPreferenceChangeInternalListener(this);
mPreferenceList = new ArrayList<Preference>();
mPreferenceLayouts = new ArrayList<PreferenceLayout>();
syncMyPreferences();
}
private void syncMyPreferences() {
synchronized(this) {
if (mIsSyncing) {
return;
}
mIsSyncing = true;
}
List<Preference> newPreferenceList = new ArrayList<Preference>(mPreferenceList.size());
mPreferenceListBackgroundIndex = new ArrayList<Integer>(mPreferenceList.size());//add by liweiping 20130826
flattenPreferenceGroup(newPreferenceList, mPreferenceGroup);
mPreferenceList = newPreferenceList;
notifyDataSetChanged();
synchronized(this) {
mIsSyncing = false;
notifyAll();
}
}
private void flattenPreferenceGroup(List<Preference> preferences, PreferenceGroup group) {
// TODO: shouldn't always?
group.sortPreferences();
final int groupSize = group.getPreferenceCount();
final int[] tempIndexOfPrefrence = calcItemsBetweenCategory(group);//add by liweiping 20130826
for (int i = 0; i < groupSize; i++) {
final Preference preference = group.getPreference(i);
preferences.add(preference);
//start by liweiping 20130826
if(tempIndexOfPrefrence[i] == 0){
mPreferenceListBackgroundIndex.add(NO_BACKGOUND);
} else if (tempIndexOfPrefrence[i] == 1
&& (i == 0 ? true : tempIndexOfPrefrence[i - 1] <= 1)){
if(i == (groupSize - 1) ? true : tempIndexOfPrefrence[i + 1] <= 1){
mPreferenceListBackgroundIndex.add(SINGLE_LINE_ROUND_CORNER_BACKGROUND);
}else {
mPreferenceListBackgroundIndex.add(TOP_ROUND_CORNER_BACKGROUND);
}
}else if(tempIndexOfPrefrence[i] > 1){
if(i == (groupSize - 1) ? true : tempIndexOfPrefrence[i + 1] <= 1){
mPreferenceListBackgroundIndex.add(BOTTOM_ROUND_CORNER_BACKGROUND);
}else {
mPreferenceListBackgroundIndex.add(CENTER_RECTANGLE_BACKGROUND);
}
}
//end by liweiping 20130826
if (!mHasReturnedViewTypeCount && !preference.hasSpecifiedLayout()) {
addPreferenceClassName(preference);
}
if (preference instanceof PreferenceGroup) {
final PreferenceGroup preferenceAsGroup = (PreferenceGroup) preference;
if (preferenceAsGroup.isOnSameScreenAsChildren()) {
flattenPreferenceGroup(preferences, preferenceAsGroup);
}
}
preference.setOnPreferenceChangeInternalListener(this);
}
}
/**
* Creates a string that includes the preference name, layout id and widget layout id.
* If a particular preference type uses 2 different resources, they will be treated as
* different view types.
*/
private PreferenceLayout createPreferenceLayout(Preference preference, PreferenceLayout in) {
PreferenceLayout pl = in != null? in : new PreferenceLayout();
pl.name = preference.getClass().getName();
pl.resId = preference.getLayoutResource();
pl.widgetResId = preference.getWidgetLayoutResource();
return pl;
}
private void addPreferenceClassName(Preference preference) {
final PreferenceLayout pl = createPreferenceLayout(preference, null);
int insertPos = Collections.binarySearch(mPreferenceLayouts, pl);
// Only insert if it doesn't exist (when it is negative).
if (insertPos < 0) {
// Convert to insert index
insertPos = insertPos * -1 - 1;
mPreferenceLayouts.add(insertPos, pl);
}
}
public int getCount() {
return mPreferenceList.size();
}
public Preference getItem(int position) {
if (position < 0 || position >= getCount()) return null;
return mPreferenceList.get(position);
}
public long getItemId(int position) {
if (position < 0 || position >= getCount()) return ListView.INVALID_ROW_ID;
return this.getItem(position).getId();
}
public View getView(int position, View convertView, ViewGroup parent) {
final Preference preference = this.getItem(position);
// Build a PreferenceLayout to compare with known ones that are cacheable.
mTempPreferenceLayout = createPreferenceLayout(preference, mTempPreferenceLayout);
// If it's not one of the cached ones, set the convertView to null so that
// the layout gets re-created by the Preference.
if (Collections.binarySearch(mPreferenceLayouts, mTempPreferenceLayout) < 0) {
convertView = null;
}
// start by liweiping 20130826
//return preference.getView(convertView, parent);
View mView = preference.getView(convertView, parent);
mView.setBackgroundResource(com.android.internal.R.color.transparent);
if(mPreferenceListBackgroundIndex.get(position) == SINGLE_LINE_ROUND_CORNER_BACKGROUND){
mView.setBackgroundResource(com.android.internal.R.drawable.easy_pref_item_single);
}else if(mPreferenceListBackgroundIndex.get(position) == TOP_ROUND_CORNER_BACKGROUND){
mView.setBackgroundResource(com.android.internal.R.drawable.easy_pref_item_top);
}else if(mPreferenceListBackgroundIndex.get(position) == CENTER_RECTANGLE_BACKGROUND){
mView.setBackgroundResource(com.android.internal.R.drawable.easy_pref_item_center);
}else if(mPreferenceListBackgroundIndex.get(position) == BOTTOM_ROUND_CORNER_BACKGROUND){
mView.setBackgroundResource(com.android.internal.R.drawable.easy_pref_item_bottom);
}
return mView;
//end by liweiping 20130826
}
@Override
public boolean isEnabled(int position) {
if (position < 0 || position >= getCount()) return true;
return this.getItem(position).isSelectable();
}
@Override
public boolean areAllItemsEnabled() {
// There should always be a preference group, and these groups are always
// disabled
return false;
}
public void onPreferenceChange(Preference preference) {
notifyDataSetChanged();
}
public void onPreferenceHierarchyChange(Preference preference) {
mHandler.removeCallbacks(mSyncRunnable);
mHandler.post(mSyncRunnable);
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public int getItemViewType(int position) {
if (!mHasReturnedViewTypeCount) {
mHasReturnedViewTypeCount = true;
}
final Preference preference = this.getItem(position);
if (preference.hasSpecifiedLayout()) {
return IGNORE_ITEM_VIEW_TYPE;
}
mTempPreferenceLayout = createPreferenceLayout(preference, mTempPreferenceLayout);
int viewType = Collections.binarySearch(mPreferenceLayouts, mTempPreferenceLayout);
if (viewType < 0) {
// This is a class that was seen after we returned the count, so
// don't recycle it.
return IGNORE_ITEM_VIEW_TYPE;
} else {
return viewType;
}
}
@Override
public int getViewTypeCount() {
if (!mHasReturnedViewTypeCount) {
mHasReturnedViewTypeCount = true;
}
return Math.max(1, mPreferenceLayouts.size());
}
//start by liweiping 20130826
private int[] calcItemsBetweenCategory(PreferenceGroup group){
final int groupSize = group.getPreferenceCount();
int[] indexOfPreference = new int[groupSize];
for (int i = 0; i < groupSize; i++) {
final Preference preference = group.getPreference(i);
if (preference instanceof PreferenceCategory) {
indexOfPreference[i] = 0 ;
}else if(i == 0){
indexOfPreference[i] = 1 ;
}else {
indexOfPreference[i] = indexOfPreference[i - 1] + 1;
}
}
return indexOfPreference;
}
//end by liweiping 20130826
}- tab风格的实现
tab风格的实现有两种方法，一种是传统的TabHost，另外一种就是从3.0开始的ActionBar中的tab，我最开始使用的就是TabHost，也大概实现了，但是最后的Bug让我头疼死了，因此果断放弃，选择了ActionBar的tab，其实一开始就应该选择这个的，由于笔者过度自信对TabHost的使用熟练度，因此结果就是不得不返工，浪费时间精力。其实用ActionBar的tab对代码的改动应该是最小的。下面来看看我修改过后的Settings.java的源码(我的修改也是打过liweiping标签的)：
/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings;
import com.android.settings.accounts.AccountSyncSettings;
import com.android.settings.bluetooth.BluetoothEnabler;
import com.android.settings.fuelgauge.PowerUsageSummary;
import com.android.settings.wifi.WifiEnabler;
//import static com.sprd.android.config.OptConfig.LC_RAM_SUPPORT;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.FragmentTransaction;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.os.SystemProperties;
import android.os.TopwiseProp;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.util.Log;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.MenuItem;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Switch;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/**
* Top-level settings activity to handle single pane and double pane UI layout.
*/
public class Settings extends PreferenceActivity implements ButtonBarHandler {
private static final String LOG_TAG = "Settings";
private static final String META_DATA_KEY_HEADER_ID =
"com.android.settings.TOP_LEVEL_HEADER_ID";
private static final String META_DATA_KEY_FRAGMENT_CLASS =
"com.android.settings.FRAGMENT_CLASS";
private static final String META_DATA_KEY_PARENT_TITLE =
"com.android.settings.PARENT_FRAGMENT_TITLE";
private static final String META_DATA_KEY_PARENT_FRAGMENT_CLASS =
"com.android.settings.PARENT_FRAGMENT_CLASS";
private static final String EXTRA_CLEAR_UI_OPTIONS = "settings:remove_ui_options";
private static final String SAVE_KEY_CURRENT_HEADER = "com.android.settings.CURRENT_HEADER";
private static final String SAVE_KEY_PARENT_HEADER = "com.android.settings.PARENT_HEADER";
public static boolean UNIVERSEUI_SUPPORT = SystemProperties.getBoolean("universe_ui_support",false);
private String mFragmentClass;
private int mTopLevelHeaderId;
private Header mFirstHeader;
private Header mCurrentHeader;
private Header mParentHeader;
private boolean mInLocalHeaderSwitch;
// TODO: Update Call Settings based on airplane mode state.
protected HashMap<Integer, Integer> mHeaderIndexMap = new HashMap<Integer, Integer>();
private List<Header> mHeaders;
//start by liweiping 20140103
private int mTabFlag;
private static final int FLAG_TAB_WIRELESS_NETWORKS = 0;
private static final int FLAG_TAB_DEVICE = 1;
private static final int FLAG_TAB_PERSONAL = 2;
private static final int FLAG_TAB_SYSTEM = 3;
private final TabListener mTabListener = new TabListener() {
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
//Log.i("lwp-log", "tab.getContentDescription().toString() = "+tab.getContentDescription().toString());
if (tab.getContentDescription().toString().equals(getResources().getString(R.string.header_category_wireless_networks))){
mTabFlag = FLAG_TAB_WIRELESS_NETWORKS;
}else if(tab.getContentDescription().toString().equals(getResources().getString(R.string.header_category_personal))) {
mTabFlag = FLAG_TAB_PERSONAL;
} else if (tab.getContentDescription().toString().equals(getResources().getString(R.string.header_category_system))) {
mTabFlag = FLAG_TAB_SYSTEM;
} else if (tab.getContentDescription().toString().equals(getResources().getString(R.string.header_category_device))) {
mTabFlag = FLAG_TAB_DEVICE;
}
Log.i("lwp-log", "onTabSelected mTabFlag = " + mTabFlag);
invalidateHeaders();
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
};
private void setupWirelessNetworks(ActionBar bar) {
final Tab tab = bar.newTab();
View view = mInflater.inflate(R.layout.tab_widget_view, null);
ImageView dialView = (ImageView)view.findViewById(R.id.main_activity_tab_image);
if(dialView != null){
dialView.setImageResource(R.drawable.ic_tab_wireless);
}
TextView dialText = (TextView) view.findViewById(R.id.main_activity_tab_text);
if(dialText!=null){
dialText.setText(R.string.header_category_wireless_networks);
}
tab.setCustomView(view);
tab.setTabListener(mTabListener);
tab.setContentDescription(R.string.header_category_wireless_networks);
bar.addTab(tab);
}
private void setupDevice(ActionBar bar) {
final Tab tab = bar.newTab();
View view = mInflater.inflate(R.layout.tab_widget_view, null);
ImageView dialView = (ImageView)view.findViewById(R.id.main_activity_tab_image);
if(dialView != null){
dialView.setImageResource(R.drawable.ic_tab_device);
}
TextView dialText = (TextView) view.findViewById(R.id.main_activity_tab_text);
if(dialText!=null){
dialText.setText(R.string.header_category_device);
}
tab.setCustomView(view);
tab.setTabListener(mTabListener);
tab.setContentDescription(R.string.header_category_device);
bar.addTab(tab);
}
private void setupPersonal(ActionBar bar) {
final Tab tab = bar.newTab();
View view = mInflater.inflate(R.layout.tab_widget_view, null);
ImageView dialView = (ImageView)view.findViewById(R.id.main_activity_tab_image);
if(dialView != null){
dialView.setImageResource(R.drawable.ic_tab_personal);
}
TextView dialText = (TextView) view.findViewById(R.id.main_activity_tab_text);
if(dialText!=null){
dialText.setText(R.string.header_category_personal);
}
tab.setCustomView(view);
tab.setTabListener(mTabListener);
tab.setContentDescription(R.string.header_category_personal);
bar.addTab(tab);
}
private void setupSystem(ActionBar bar) {
final Tab tab = bar.newTab();
View view = mInflater.inflate(R.layout.tab_widget_view, null);
ImageView dialView = (ImageView)view.findViewById(R.id.main_activity_tab_image);
if(dialView != null){
dialView.setImageResource(R.drawable.ic_tab_system);
}
TextView dialText = (TextView) view.findViewById(R.id.main_activity_tab_text);
if(dialText!=null){
dialText.setText(R.string.header_category_system);
}
tab.setCustomView(view);
tab.setTabListener(mTabListener);
tab.setContentDescription(R.string.header_category_system);
bar.addTab(tab);
}
private LayoutInflater mInflater;
//end by liweiping 20140103
@Override
protected void onCreate(Bundle savedInstanceState) {
if(UNIVERSEUI_SUPPORT){
this.setTheme(R.style.Theme_Holo_new_ui);
}
if (getIntent().getBooleanExtra(EXTRA_CLEAR_UI_OPTIONS, false)) {
getWindow().setUiOptions(0);
}
//start by liweiping 20140103
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
mInflater = getLayoutInflater();
mTabFlag = FLAG_TAB_WIRELESS_NETWORKS;
//end by liweiping 20140103
getMetaData();
mInLocalHeaderSwitch = true;
super.onCreate(savedInstanceState);
mInLocalHeaderSwitch = false;
//For LowCost case, define the list selector by itself
// if (LC_RAM_SUPPORT) {
//ListView list = getListView();
//list.setSelector(R.drawable.list_selector_holo_dark);
// list.setOverScrollMode(View.OVER_SCROLL_NEVER);
// }
if (!onIsHidingHeaders() && onIsMultiPane()) {
highlightHeader();
// Force the title so that it doesn't get overridden by a direct launch of
// a specific settings screen.
setTitle(R.string.settings_label);
}
// Retrieve any saved state
if (savedInstanceState != null) {
mCurrentHeader = savedInstanceState.getParcelable(SAVE_KEY_CURRENT_HEADER);
mParentHeader = savedInstanceState.getParcelable(SAVE_KEY_PARENT_HEADER);
}
// If the current header was saved, switch to it
if (savedInstanceState != null && mCurrentHeader != null) {
//switchToHeaderLocal(mCurrentHeader);
showBreadCrumbs(mCurrentHeader.title, null);
}
if (mParentHeader != null) {
setParentTitle(mParentHeader.title, null, new OnClickListener() {
public void onClick(View v) {
switchToParent(mParentHeader.fragment);
}
});
}
}
/* Set ActionBar with popup function */
protected void setActionBarStyle() {
ActionBar actionBar = getActionBar();
if (actionBar == null){
return;
}
//start by liweiping 20140106
Log.i("lwp-log", "this.toString() = " + this.toString());
//if ( this.toString().contains("SubSettings") ) {
if ( this.toString().contains("SubSettings") || this.toString().contains("$")) {
//end by liweiping 20140106
actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP, ActionBar.DISPLAY_HOME_AS_UP);
actionBar.setDisplayHomeAsUpEnabled(true);
}
else {
actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP
^ ActionBar.DISPLAY_HOME_AS_UP
, ActionBar.DISPLAY_HOME_AS_UP);
actionBar.setDisplayHomeAsUpEnabled(false);
//start by liweiping 20140103
actionBar.setAlternativeTabStyle(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
if(actionBar.getTabCount() == 0){
setupWirelessNetworks(actionBar);
setupDevice(actionBar);
setupPersonal(actionBar);
setupSystem(actionBar);
}
final SharedPreferences settings = PreferenceManager
.getDefaultSharedPreferences(this);
mTabFlag = settings.getInt("tab", FLAG_TAB_WIRELESS_NETWORKS);
Log.i("lwp-log", "setActionBarStyle mTabFlag = " + mTabFlag);
actionBar.selectTab(actionBar.getTabAt(mTabFlag));
//end by liweiping 20140103
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Add support for android.R.id.home in all Setting's onOptionsItemSelected
// getActionBar().setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP,
// ActionBar.DISPLAY_HOME_AS_UP);
// Now it's done.
if (item.getItemId() == android.R.id.home) {
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// Save the current fragment, if it is the same as originally launched
if (mCurrentHeader != null) {
outState.putParcelable(SAVE_KEY_CURRENT_HEADER, mCurrentHeader);
}
if (mParentHeader != null) {
outState.putParcelable(SAVE_KEY_PARENT_HEADER, mParentHeader);
}
}
@Override
public void onResume() {
ListAdapter listAdapter = getListAdapter();
if (listAdapter instanceof HeaderAdapter) {
((HeaderAdapter) listAdapter).resume();
}
setActionBarStyle();
super.onResume();
}
@Override
public void onPause() {
super.onPause();
ListAdapter listAdapter = getListAdapter();
if (listAdapter instanceof HeaderAdapter) {
((HeaderAdapter) listAdapter).pause();
}
//start by liweiping 20140106
final SharedPreferences settings = PreferenceManager
.getDefaultSharedPreferences(this);
settings.edit().putInt("tab", settings.getInt("tab", FLAG_TAB_WIRELESS_NETWORKS)).commit();
//end by liweiping 20140106
}
//start by liweiping 20140106
@Override
protected void onDestroy() {
super.onDestroy();
//final SharedPreferences settings = PreferenceManager
// .getDefaultSharedPreferences(this);
//settings.edit().putInt("tab", FLAG_TAB_WIRELESS_NETWORKS).commit();
}
//end by liweiping 20140106
@Override
public void onBackPressed() {
if (!moveTaskToBack(false)) {
super.onBackPressed();
}
}
private void switchToHeaderLocal(Header header) {
mInLocalHeaderSwitch = true;
switchToHeader(header);
mInLocalHeaderSwitch = false;
}
@Override
public void switchToHeader(Header header) {
if (!mInLocalHeaderSwitch) {
mCurrentHeader = null;
mParentHeader = null;
}
super.switchToHeader(header);
}
/**
* Switch to parent fragment and store the grand parent's info
* @param className name of the activity wrapper for the parent fragment.
*/
private void switchToParent(String className) {
final ComponentName cn = new ComponentName(this, className);
try {
final PackageManager pm = getPackageManager();
final ActivityInfo parentInfo = pm.getActivityInfo(cn, PackageManager.GET_META_DATA);
if (parentInfo != null && parentInfo.metaData != null) {
String fragmentClass = parentInfo.metaData.getString(META_DATA_KEY_FRAGMENT_CLASS);
CharSequence fragmentTitle = parentInfo.loadLabel(pm);
Header parentHeader = new Header();
parentHeader.fragment = fragmentClass;
parentHeader.title = fragmentTitle;
mCurrentHeader = parentHeader;
switchToHeaderLocal(parentHeader);
highlightHeader();
mParentHeader = new Header();
mParentHeader.fragment
= parentInfo.metaData.getString(META_DATA_KEY_PARENT_FRAGMENT_CLASS);
mParentHeader.title = parentInfo.metaData.getString(META_DATA_KEY_PARENT_TITLE);
}
} catch (NameNotFoundException nnfe) {
Log.w(LOG_TAG, "Could not find parent activity : " + className);
}
}
@Override
public void onNewIntent(Intent intent) {
super.onNewIntent(intent);
// If it is not launched from history, then reset to top-level
if ((intent.getFlags() & Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY) == 0
&& mFirstHeader != null && !onIsHidingHeaders() && onIsMultiPane()) {
switchToHeaderLocal(mFirstHeader);
}
}
private void highlightHeader() {
if (mTopLevelHeaderId != 0) {
Integer index = mHeaderIndexMap.get(mTopLevelHeaderId);
if (index != null) {
getListView().setItemChecked(index, true);
getListView().smoothScrollToPosition(index);
}
}
}
@Override
public Intent getIntent() {
Intent superIntent = super.getIntent();
String startingFragment = getStartingFragmentClass(superIntent);
// This is called from super.onCreate, isMultiPane() is not yet reliable
// Do not use onIsHidingHeaders either, which relies itself on this method
if (startingFragment != null && !onIsMultiPane()) {
Intent modIntent = new Intent(superIntent);
modIntent.putExtra(EXTRA_SHOW_FRAGMENT, startingFragment);
Bundle args = superIntent.getExtras();
if (args != null) {
args = new Bundle(args);
} else {
args = new Bundle();
}
args.putParcelable("intent", superIntent);
modIntent.putExtra(EXTRA_SHOW_FRAGMENT_ARGUMENTS, superIntent.getExtras());
return modIntent;
}
return superIntent;
}
/**
* Checks if the component name in the intent is different from the Settings class and
* returns the class name to load as a fragment.
*/
protected String getStartingFragmentClass(Intent intent) {
if (mFragmentClass != null) return mFragmentClass;
String intentClass = intent.getComponent().getClassName();
if (intentClass.equals(getClass().getName())) return null;
if ("com.android.settings.ManageApplications".equals(intentClass)
|| "com.android.settings.RunningServices".equals(intentClass)
|| "com.android.settings.applications.StorageUse".equals(intentClass)) {
// Old names of manage apps.
intentClass = com.android.settings.applications.ManageApplications.class.getName();
}
return intentClass;
}
/**
* Override initial header when an activity-alias is causing Settings to be launched
* for a specific fragment encoded in the android:name parameter.
*/
@Override
public Header onGetInitialHeader() {
String fragmentClass = getStartingFragmentClass(super.getIntent());
if (fragmentClass != null) {
Header header = new Header();
header.fragment = fragmentClass;
header.title = getTitle();
header.fragmentArguments = getIntent().getExtras();
mCurrentHeader = header;
return header;
}
return mFirstHeader;
}
@Override
public Intent onBuildStartFragmentIntent(String fragmentName, Bundle args,
int titleRes, int shortTitleRes) {
Intent intent = super.onBuildStartFragmentIntent(fragmentName, args,
titleRes, shortTitleRes);
// some fragments want to avoid split actionbar
if (DataUsageSummary.class.getName().equals(fragmentName) ||
PowerUsageSummary.class.getName().equals(fragmentName) ||
AccountSyncSettings.class.getName().equals(fragmentName) ||
UserDictionarySettings.class.getName().equals(fragmentName)) {
intent.putExtra(EXTRA_CLEAR_UI_OPTIONS, true);
}
intent.setClass(this, SubSettings.class);
return intent;
}
/**
* Populate the activity with the top-level headers.
*/
@Override
public void onBuildHeaders(List<Header> headers) {
//start by liweiping 20130103
//if(UNIVERSEUI_SUPPORT){
// loadHeadersFromResource(R.xml.settings_headers_uui, headers);
//}else{
// loadHeadersFromResource(R.xml.settings_headers, headers);
//}
Log.i("lwp", "mTabFlag = "+mTabFlag + ", headers.size() = "+ headers.size() );
if (mTabFlag == FLAG_TAB_WIRELESS_NETWORKS){
loadHeadersFromResource(R.xml.settings_headers_wireless_networks, headers);
}else if(mTabFlag == FLAG_TAB_DEVICE){
loadHeadersFromResource(R.xml.settings_headers_device, headers);
}else if(mTabFlag == FLAG_TAB_PERSONAL){
loadHeadersFromResource(R.xml.settings_headers_personal, headers);
}else{
loadHeadersFromResource(R.xml.settings_headers_system, headers);
}
//end by liweiping 20130103
updateHeaderList(headers);
//start by liweiping 20130107 for bug 1146
//mHeaders = headers;
if(mHeaders != null){
mHeaders.clear();
mHeaders.addAll(headers);
}
//end by liweiping 20130107
}
private void updateHeaderList(List<Header> target) {
int i = 0;
while (i < target.size()) {
Header header = target.get(i);
// Ids are integers, so downcasting
int id = (int) header.id;
if (id == R.id.dock_settings) {
if (!needsDockSettings())
target.remove(header);
} else if (id == R.id.operator_settings || id == R.id.manufacturer_settings) {
Utils.updateHeaderToSpecificActivityFromMetaDataOrRemove(this, target, header);
} else if (id == R.id.wifi_settings) {
// Remove WiFi Settings if WiFi service is not available.
// modified by zhangguixin
// if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_WIFI)) {
if (!SystemProperties.getBoolean("ro.device.support.wifi", true)) {
// if ("0".equals(SystemProperties.getBoolean("ro.device.support.wifi", "1"))) {
target.remove(header);
}
} else if (id == R.id.bluetooth_settings) {
// Remove Bluetooth Settings if Bluetooth service is not available.
// modified by zhangguixin
// if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)) {
if (!SystemProperties.getBoolean("ro.device.support.bt", true)) {
// if ("0".equals(SystemProperties.getBoolean("ro.device.support.bt", "1"))) {
target.remove(header);
}
} else if (id == R.id.dual_sim_settings) {
if (!TelephonyManager.isMultiSim()) {
target.remove(header);
}
} else if (id == R.id.data_usage_settings &&
"sc8825".equalsIgnoreCase(SystemProperties.get("ro.board.platform", "sc8825"))) {//fix bug182500
target.remove(header);
}
//add by huangweiwei, topwise, 2013-10-12
else if (id == R.id.development_settings) {
if (android.os.TopwiseProp.getDefaultSettingBoolean("settings_remove_development", false)) {
target.remove(header);
}
}
//add end by huangweiwei, topwise, 2013-10-12
// Increment if the current one wasn't removed by the Utils code.
if (target.get(i) == header) {
// Hold on to the first header, when we need to reset to the top-level
if (mFirstHeader == null &&
HeaderAdapter.getHeaderType(header) != HeaderAdapter.HEADER_TYPE_CATEGORY) {
mFirstHeader = header;
}
mHeaderIndexMap.put(id, i);
i++;
}
}
}
private boolean needsDockSettings() {
return getResources().getBoolean(R.bool.has_dock_settings);
}
private void getMetaData() {
try {
ActivityInfo ai = getPackageManager().getActivityInfo(getComponentName(),
PackageManager.GET_META_DATA);
if (ai == null || ai.metaData == null) return;
mTopLevelHeaderId = ai.metaData.getInt(META_DATA_KEY_HEADER_ID);
mFragmentClass = ai.metaData.getString(META_DATA_KEY_FRAGMENT_CLASS);
// Check if it has a parent specified and create a Header object
final int parentHeaderTitleRes = ai.metaData.getInt(META_DATA_KEY_PARENT_TITLE);
String parentFragmentClass = ai.metaData.getString(META_DATA_KEY_PARENT_FRAGMENT_CLASS);
if (parentFragmentClass != null) {
mParentHeader = new Header();
mParentHeader.fragment = parentFragmentClass;
if (parentHeaderTitleRes != 0) {
mParentHeader.title = getResources().getString(parentHeaderTitleRes);
}
}
} catch (NameNotFoundException nnfe) {
// No recovery
}
}
@Override
public boolean hasNextButton() {
return super.hasNextButton();
}
@Override
public Button getNextButton() {
return super.getNextButton();
}
private static class HeaderAdapter extends ArrayAdapter<Header> {
static final int HEADER_TYPE_CATEGORY = 0;
static final int HEADER_TYPE_NORMAL = 1;
static final int HEADER_TYPE_SWITCH = 2;
private static final int HEADER_TYPE_COUNT = HEADER_TYPE_SWITCH + 1;
private final WifiEnabler mWifiEnabler;
private final BluetoothEnabler mBluetoothEnabler;
private SparseArray<View> mViewCache;
private static class HeaderViewHolder {
ImageView icon;
TextView title;
TextView summary;
Switch switch_;
}
private LayoutInflater mInflater;
static int getHeaderType(Header header) {
if (header.fragment == null && header.intent == null) {
return HEADER_TYPE_CATEGORY;
} else if (header.id == R.id.wifi_settings || header.id == R.id.bluetooth_settings) {
return HEADER_TYPE_SWITCH;
} else {
return HEADER_TYPE_NORMAL;
}
}
@Override
public int getItemViewType(int position) {
Header header = getItem(position);
return getHeaderType(header);
}
//start by liweiping 20140106
@Override
public void notifyDataSetChanged() {
// TODO Auto-generated method stub
super.notifyDataSetChanged();
mViewCache = new SparseArray<View>(getCount());
}
//end by liweiping 20140106
@Override
public boolean areAllItemsEnabled() {
return false; // because of categories
}
@Override
public boolean isEnabled(int position) {
return getItemViewType(position) != HEADER_TYPE_CATEGORY;
}
@Override
public int getViewTypeCount() {
return HEADER_TYPE_COUNT;
}
@Override
public boolean hasStableIds() {
return true;
}
public HeaderAdapter(Context context, List<Header> objects) {
super(context, 0, objects);
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// Temp Switches provided as placeholder until the adapter replaces these with actual
// Switches inflated from their layouts. Must be done before adapter is set in super
mWifiEnabler = new WifiEnabler(context, new Switch(context));
mBluetoothEnabler = new BluetoothEnabler(context, new Switch(context));
mViewCache = new SparseArray<View>(objects.size());
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
HeaderViewHolder holder;
Header header = getItem(position);
int headerType = getHeaderType(header);
View view = null;
convertView = mViewCache.get(position);
if (convertView == null) {
holder = new HeaderViewHolder();
switch (headerType) {
case HEADER_TYPE_CATEGORY:
view = new TextView(getContext(), null,
android.R.attr.listSeparatorTextViewStyle);
holder.title = (TextView) view;
break;
case HEADER_TYPE_SWITCH:
view = mInflater.inflate(R.layout.preference_header_switch_item, parent,
false);
holder.icon = (ImageView) view.findViewById(R.id.icon);
holder.title = (TextView)
view.findViewById(com.android.internal.R.id.title);
holder.summary = (TextView)
view.findViewById(com.android.internal.R.id.summary);
holder.switch_ = (Switch) view.findViewById(R.id.switchWidget);
break;
case HEADER_TYPE_NORMAL:
view = mInflater.inflate(
com.android.internal.R.layout.preference_header_item, parent,
false);
holder.icon = (ImageView) view.findViewById(com.android.internal.R.id.icon);
holder.title = (TextView)
view.findViewById(com.android.internal.R.id.title);
holder.summary = (TextView)
view.findViewById(com.android.internal.R.id.summary);
break;
}
view.setBackgroundDrawable(null);
view.setTag(holder);
mViewCache.put(position, view);
} else {
view = convertView;
holder = (HeaderViewHolder) view.getTag();
return view;
}
// All view fields must be updated every time, because the view may be recycled
switch (headerType) {
case HEADER_TYPE_CATEGORY:
holder.title.setText(header.getTitle(getContext().getResources()));
holder.title.setTextColor(android.R.color.transparent);//add by liweiping 20130826
break;
case HEADER_TYPE_SWITCH:
// Would need a different treatment if the main menu had more switches
if (header.id == R.id.wifi_settings) {
mWifiEnabler.setSwitch(holder.switch_);
} else {
mBluetoothEnabler.setSwitch(holder.switch_);
}
// No break, fall through on purpose to update common fields
//$FALL-THROUGH$
case HEADER_TYPE_NORMAL:
holder.icon.setImageResource(header.iconRes);
holder.title.setText(header.getTitle(getContext().getResources()));
CharSequence summary = header.getSummary(getContext().getResources());
if (!TextUtils.isEmpty(summary)) {
holder.summary.setVisibility(View.VISIBLE);
holder.summary.setText(summary);
} else {
holder.summary.setVisibility(View.GONE);
}
break;
}
//start by liweiping 20130826
if (header.fragment == null && header.intent == null) {
view.setBackgroundColor(android.R.color.transparent);
}else if(header.id == R.id.dual_sim_settings || header.id == R.id.sound_settings || header.id == R.id.sync_settings || header.id == R.id.dock_settings || header.id == R.id.date_time_settings){
view.setBackgroundResource(com.android.internal.R.drawable.easy_pref_item_top);
}else if(header.id == R.id.wireless_settings || header.id == R.id.manufacturer_settings || header.id == R.id.privacy_settings || header.id == R.id.about_settings || header.id == R.id.application_settings){
view.setBackgroundResource(com.android.internal.R.drawable.easy_pref_item_bottom);
}else {
view.setBackgroundResource(com.android.internal.R.drawable.easy_pref_item_center);
}
//end by liweiping 20130826
return view;
}
public void resume() {
mWifiEnabler.resume();
mBluetoothEnabler.resume();
}
public void pause() {
mWifiEnabler.pause();
mBluetoothEnabler.pause();
}
}
@Override
public boolean onPreferenceStartFragment(PreferenceFragment caller, Preference pref) {
// Override the fragment title for Wallpaper settings
int titleRes = pref.getTitleRes();
if (pref.getFragment().equals(WallpaperTypeSettings.class.getName())) {
titleRes = R.string.wallpaper_settings_fragment_title;
}
startPreferencePanel(pref.getFragment(), pref.getExtras(), titleRes, null, null, 0);
return true;
}
//start,added by topwise hehuadong in 2013.10.24
@Override
public void onHeaderClick(Header header, int position) {
// TODO Auto-generated method stub
//start by liweiping 20140105
final SharedPreferences settings = PreferenceManager
.getDefaultSharedPreferences(this);
settings.edit().putInt("tab", mTabFlag).commit();
Log.i("lwp-log", "onHeaderClick..." + settings.getInt("tab", -1));
//end by liweiping 20140105
if (TopwiseProp.getDefaultSettingString("default_customize_about_device")!=null){
if (header != null && header.fragment !=null && header.fragment.equals("com.android.settings.DeviceInfoSettings")){
header.fragment="com.android.settings.AboutDeviceSettings";
}
}
super.onHeaderClick(header, position);
}
//end,added by topwise hehuadong in 2013.10.24
@Override
public void setListAdapter(ListAdapter adapter) {
if (mHeaders == null) {
mHeaders = new ArrayList<Header>();
// When the saved state provides the list of headers, onBuildHeaders is not called
// Copy the list of Headers from the adapter, preserving their order
for (int i = 0; i < adapter.getCount(); i++) {
mHeaders.add((Header) adapter.getItem(i));
}
}
// Ignore the adapter provided by PreferenceActivity and substitute ours instead
super.setListAdapter(new HeaderAdapter(this, mHeaders));
}
/*
* Settings subclasses for launching independently.
*/
public static class BluetoothSettingsActivity extends Settings { /* empty */ }
public static class WirelessSettingsActivity extends Settings { /* empty */ }
public static class TetherSettingsActivity extends Settings { /* empty */ }
public static class VpnSettingsActivity extends Settings { /* empty */ }
public static class DateTimeSettingsActivity extends Settings { /* empty */ }
public static class StorageSettingsActivity extends Settings { /* empty */ }
public static class WifiSettingsActivity extends Settings { /* empty */ }
public static class WifiP2pSettingsActivity extends Settings { /* empty */ }
public static class InputMethodAndLanguageSettingsActivity extends Settings { /* empty */ }
public static class InputMethodAndSubtypeEnablerActivity extends Settings { /* empty */ }
public static class SpellCheckersSettingsActivity extends Settings { /* empty */ }
public static class LocalePickerActivity extends Settings { /* empty */ }
public static class UserDictionarySettingsActivity extends Settings { /* empty */ }
public static class SoundSettingsActivity extends Settings { /* empty */ }
public static class DisplaySettingsActivity extends Settings { /* empty */ }
public static class DeviceInfoSettingsActivity extends Settings { /* empty */ }
public static class ApplicationSettingsActivity extends Settings { /* empty */ }
public static class ManageApplicationsActivity extends Settings { /* empty */ }
public static class StorageUseActivity extends Settings { /* empty */ }
public static class DevelopmentSettingsActivity extends Settings { /* empty */ }
public static class AccessibilitySettingsActivity extends Settings { /* empty */ }
public static class SecuritySettingsActivity extends Settings { /* empty */ }
public static class LocationSettingsActivity extends Settings { /* empty */ }
public static class PrivacySettingsActivity extends Settings { /* empty */ }
public static class DockSettingsActivity extends Settings { /* empty */ }
public static class RunningServicesActivity extends Settings { /* empty */ }
public static class ManageAccountsSettingsActivity extends Settings { /* empty */ }
public static class PowerUsageSummaryActivity extends Settings { /* empty */ }
public static class AccountSyncSettingsActivity extends Settings { /* empty */ }
public static class AccountSyncSettingsInAddAccountActivity extends Settings { /* empty */ }
public static class CryptKeeperSettingsActivity extends Settings { /* empty */ }
public static class DeviceAdminSettingsActivity extends Settings { /* empty */ }
public static class DataUsageSummaryActivity extends Settings { /* empty */ }
public static class AdvancedWifiSettingsActivity extends Settings { /* empty */ }
public static class TextToSpeechSettingsActivity extends Settings { /* empty */ }
public static class AndroidBeamSettingsActivity extends Settings { /* empty */ }
}简单分析一下：
①.首先我们在onResume中找到setActionBarStyle这个函数，这就是设置每次恢复时的必经之路，在这里，我们改变ActionBar的样式，如果是一级界面，就加上tab风格，二级界面就去掉tab风格，显示返回键。
/* Set ActionBar with popup function */
protected void setActionBarStyle() {
ActionBar actionBar = getActionBar();
if (actionBar == null){
return;
}
//start by liweiping 20140106
Log.i("lwp-log", "this.toString() = " + this.toString());
//if ( this.toString().contains("SubSettings") ) {
if ( this.toString().contains("SubSettings") || this.toString().contains("$")) {
//end by liweiping 20140106
actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP, ActionBar.DISPLAY_HOME_AS_UP);
actionBar.setDisplayHomeAsUpEnabled(true);
}
else {
actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP
^ ActionBar.DISPLAY_HOME_AS_UP
, ActionBar.DISPLAY_HOME_AS_UP);
actionBar.setDisplayHomeAsUpEnabled(false);
//start by liweiping 20140103
actionBar.setAlternativeTabStyle(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
if(actionBar.getTabCount() == 0){
setupWirelessNetworks(actionBar);
setupDevice(actionBar);
setupPersonal(actionBar);
setupSystem(actionBar);
}
final SharedPreferences settings = PreferenceManager
.getDefaultSharedPreferences(this);
mTabFlag = settings.getInt("tab", FLAG_TAB_WIRELESS_NETWORKS);
Log.i("lwp-log", "setActionBarStyle mTabFlag = " + mTabFlag);
actionBar.selectTab(actionBar.getTabAt(mTabFlag));
//end by liweiping 20140103
}
}②.监听tab的选择事件，点击每一个tab产生对应的事件，然后把选择项存为全局变量mTabFlag中，最后调用invalidateHeaders()函数刷新界面，替换成不同的Header list。
private final TabListener mTabListener = new TabListener() {
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
//Log.i("lwp-log", "tab.getContentDescription().toString() = "+tab.getContentDescription().toString());
if (tab.getContentDescription().toString().equals(getResources().getString(R.string.header_category_wireless_networks))){
mTabFlag = FLAG_TAB_WIRELESS_NETWORKS;
}else if(tab.getContentDescription().toString().equals(getResources().getString(R.string.header_category_personal))) {
mTabFlag = FLAG_TAB_PERSONAL;
} else if (tab.getContentDescription().toString().equals(getResources().getString(R.string.header_category_system))) {
mTabFlag = FLAG_TAB_SYSTEM;
} else if (tab.getContentDescription().toString().equals(getResources().getString(R.string.header_category_device))) {
mTabFlag = FLAG_TAB_DEVICE;
}
Log.i("lwp-log", "onTabSelected mTabFlag = " + mTabFlag);
invalidateHeaders();
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
};③.当调用invalidateHeaders()函数时，就进入了onBuildHeaders(List<Header> headers)函数，在这里，我们需要根据mTabFlag来loadHeadersFromResource对应的布局文件，最后一定要记住用新的headers将全局变量mHeaders替换掉。
/**
* Populate the activity with the top-level headers.
*/
@Override
public void onBuildHeaders(List<Header> headers) {
//start by liweiping 20130103
//if(UNIVERSEUI_SUPPORT){
// loadHeadersFromResource(R.xml.settings_headers_uui, headers);
//}else{
// loadHeadersFromResource(R.xml.settings_headers, headers);
//}
Log.i("lwp", "mTabFlag = "+mTabFlag + ", headers.size() = "+ headers.size() );
if (mTabFlag == FLAG_TAB_WIRELESS_NETWORKS){
loadHeadersFromResource(R.xml.settings_headers_wireless_networks, headers);
}else if(mTabFlag == FLAG_TAB_DEVICE){
loadHeadersFromResource(R.xml.settings_headers_device, headers);
}else if(mTabFlag == FLAG_TAB_PERSONAL){
loadHeadersFromResource(R.xml.settings_headers_personal, headers);
}else{
loadHeadersFromResource(R.xml.settings_headers_system, headers);
}
//end by liweiping 20130103
updateHeaderList(headers);
//start by liweiping 20130107 for bug 1146
//mHeaders = headers;
if(mHeaders != null){
mHeaders.clear();
mHeaders.addAll(headers);
}
//end by liweiping 20130107
}OK，今天就大概这样了。
转载于:https://my.oschina.net/cjkall/blog/195789