项目目录如下
第一步:自定义activity_bottom.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal"
android:background="#ffffff">
<RelativeLayout
android:id="@+id/main_layout"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_weight="1">
<ImageView
android:id="@+id/main_iamgeview"
android:layout_width="35dp"
android:layout_height="35dp"
android:src="@drawable/main2"
android:layout_centerHorizontal="true"/>
<TextView
android:id="@+id/main_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="首页"
android:layout_below="@+id/main_iamgeview"
android:layout_centerHorizontal="true"
android:textSize="12dp"
android:textColor="#707070"/>
</RelativeLayout>
<RelativeLayout
android:id="@+id/more_layout"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_weight="1">
<ImageView
android:id="@+id/more_iamgeview"
android:layout_width="35dp"
android:layout_height="35dp"
android:src="@drawable/more1"
android:layout_centerHorizontal="true"/>
<TextView
android:id="@+id/more_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="更多"
android:layout_below="@+id/more_iamgeview"
android:layout_centerHorizontal="true"
android:textSize="12dp"
android:textColor="#707070"/>
</RelativeLayout>
<RelativeLayout
android:id="@+id/mine_layout"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_weight="1">
<ImageView
android:id="@+id/mine_iamgeview"
android:layout_width="35dp"
android:layout_height="35dp"
android:src="@drawable/my1"
android:layout_centerHorizontal="true"/>
<TextView
android:id="@+id/mine_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我的"
android:layout_below="@+id/mine_iamgeview"
android:layout_centerHorizontal="true"
android:textSize="12dp"
android:textColor="#707070"/>
</RelativeLayout>
</LinearLayout>
</LinearLayout>
第二步:引入到main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="@+id/Fragment_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="50dp"/>
<include layout="@layout/activity_bottom"/>
</RelativeLayout>
第三步:Fragment布局文件main_fragment.xml如下(其他两个一样):
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我是首页"
android:textColor="#000000"
android:layout_centerInParent="true"/>
</RelativeLayout>
第四步:继承Fragment(其他两个也一样)
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.fragmentlayout.R;
public class MainFragment extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.main_fragment, container, false);
return view;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
Main_activity如下:
重点注意:引入support-v4库,它能让Fragment(碎片)在所有Android的版本中保持一致性。比如在Fragment嵌套Fragment是很常见的,如果使用内置的android.app.Fragment库,在Android 4.2之前程序会崩溃的。所以强烈建议使用统一的support-v4库。
package com.example.fragmentlayout;
import android.graphics.Color;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.example.fragmentlayout.Fragment.MainFragment;
import com.example.fragmentlayout.Fragment.MineFragment;
import com.example.fragmentlayout.Fragment.MoreFragment;
public class MainActivity extends FragmentActivity implements View.OnClickListener {
private TextView main_textview,more_textview,mine_textview;
private ImageView main_imageview,more_imageview,mine_imageview;
private RelativeLayout main_layout,more_layout,mine_layout;
private Fragment mainFragment,moreFragment,mineFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);//删除自带标题栏(如果继承AppCompatActivity,不起效果,所以继承FragmentActivity)
setContentView(R.layout.activity_main);
initView();
setSelect(0);
//显示第一个Fragment (0代表mainFragment,1代表moreFragment,2代表mineFragment);
}
private void initView() {
main_imageview=(ImageView)findViewById(R.id.main_iamgeview);
more_imageview=(ImageView)findViewById(R.id.more_iamgeview);
mine_imageview=(ImageView)findViewById(R.id.mine_iamgeview);
main_textview=(TextView)findViewById(R.id.main_textview);
more_textview=(TextView)findViewById(R.id.more_textview);
mine_textview=(TextView)findViewById(R.id.mine_textview);
main_layout=(RelativeLayout)findViewById(R.id.main_layout);
more_layout=(RelativeLayout)findViewById(R.id.more_layout);
mine_layout=(RelativeLayout)findViewById(R.id.mine_layout);
main_layout.setOnClickListener(this);
more_layout.setOnClickListener(this);
mine_layout.setOnClickListener(this);
}
//显示默认界面
private void setSelect(int i) {
FragmentManager fragmentmanager=getSupportFragmentManager();
FragmentTransaction transaction=fragmentmanager.beginTransaction();
hideFragment(transaction);
switch (i){
//如果Fragment未添加到activity容器中,先对要添加的Fragment进行实例化,在通过transaction.add()方法进行添加。
//所以在initView()里就不必在进行实例化
//通过transaction.hide()和transaction.show()进行隐藏和显示
case 0:
if(mainFragment==null){
mainFragment=new MainFragment();
transaction.add(R.id.Fragment_layout,mainFragment);
}else{
transaction.show(mainFragment);
}
break;
case 1:
if(moreFragment==null){
moreFragment=new MoreFragment();
transaction.add(R.id.Fragment_layout,moreFragment);
}else{
transaction.show(moreFragment);
}
break;
case 2:
if(mineFragment==null){
mineFragment=new MineFragment();
transaction.add(R.id.Fragment_layout,mineFragment);
}else{
transaction.show(mineFragment);
}
break;
}
transaction.commit();
}
private void hideFragment(FragmentTransaction transaction) {
if(mainFragment!=null){
transaction.hide(mainFragment);
}
if(moreFragment!=null){
transaction.hide(moreFragment);
}
if(mineFragment!=null){
transaction.hide(mineFragment);
}
}
@Override
public void onClick(View v) {
initImageText();
switch (v.getId()){
case R.id.main_layout:
setSelect(0);
main_imageview.setImageResource(R.drawable.main2);
main_textview.setTextColor(Color.parseColor("#707070"));
break;
case R.id.more_layout:
setSelect(1);
more_imageview.setImageResource(R.drawable.more2);
more_textview.setTextColor(Color.parseColor("#707070"));
break;
case R.id.mine_layout:
setSelect(2);
mine_imageview.setImageResource(R.drawable.my2);
mine_textview.setTextColor(Color.parseColor("#707070"));
break;
}
}
//初始化图片和文字(未点击自定义的Tab下样式)
private void initImageText() {
main_imageview.setImageResource(R.drawable.main1);
more_imageview.setImageResource(R.drawable.more1);
mine_imageview.setImageResource(R.drawable.my1);
main_textview.setTextColor(Color.parseColor("#dfdfdf"));
more_textview.setTextColor(Color.parseColor("#dfdfdf"));
mine_textview.setTextColor(Color.parseColor("#dfdfdf"));
}
}
效果图如下: