1、ContextMenu
第一种ContextMenu
public class MainActivity extends AppCompatActivity {
private Button mButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mButton = findViewById(R.id.button);
mButton.setOnCreateContextMenuListener(MainActivity.this);
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
v.showContextMenu();
}
});
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.context_menu, menu);
}
//点击事件处理
@Override
public boolean onContextItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.text1:
Toast.makeText(MainActivity.this,"你点击了" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
case R.id.text2:
Toast.makeText(MainActivity.this,"你点击了" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
case R.id.text3:
Toast.makeText(MainActivity.this,"你点击了" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
default:
break;
}
return super.onContextItemSelected(item);
}
}
在res文件夹下创建menu文件夹,再创建context_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/text1"
android:title="文本1"
/>
<item android:id="@+id/text2"
android:title="文本2"
/>
<item android:id="@+id/text3"
android:title="文本3"
/>
</menu>
第二种ContextMenu
public class MainActivity extends AppCompatActivity {
private ArrayList<String> mList;
private ListView mListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView = findViewById(R.id.listView);
mList = new ArrayList<>();
for(int i = 0 ; i < 3; i++) {
mList.add("文本" + i);
}
mListView.setAdapter(new ArrayAdapter<String>(
MainActivity.this,
android.R.layout.simple_expandable_list_item_1,
mList
));
/*为listView添加()注册上下文菜单*/
registerForContextMenu(mListView);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
//获取适配器
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
//设置标题
menu.setHeaderTitle(mList.get(info.position));
/*设置选项内容*/
//参数一:组,参数二:项目编号 参数三:位置
menu.add(0,1,0, "嘤嘤嘤");
menu.add(0,2,0, "噫噫噫");
menu.add(0,3,0, "呀呀呀");
}
@Override
public boolean onContextItemSelected(MenuItem item) {
switch (item.getItemId()) {
case 1:
Toast.makeText(MainActivity.this,"你点击了" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
case 2:
Toast.makeText(MainActivity.this,"你点击了" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
case 3:
Toast.makeText(MainActivity.this,"你点击了" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
default:
break;
}
return super.onContextItemSelected(item);
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.admin.vip_10.MainActivity">
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
注意一点就是此处弹出ContextMenu需要长按。
2、TabHost
第一种TabHost写法:
<TabHost android:layout_height="match_parent"
android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</TabWidget>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
>
<LinearLayout
android:id="@+id/layout_1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPrimaryDark"
android:orientation="vertical"
>
</LinearLayout>
<LinearLayout
android:id="@+id/layout_2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorAccent"
android:orientation="vertical"
>
</LinearLayout>
</FrameLayout>
</LinearLayout>
</TabHost>
需要注意的地方:
1. TabHost id必须是 android:id=”@android:id/tabhost”
2. TabWidget id必须是 android:id=”@android:id/tabs”
3. FrameLayout id必须是 android:id=”@android:id/tabcontent”
//注意继承TabActivity
public class MainActivity extends TabActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabHost tabHost = getTabHost();
tabHost.addTab(
tabHost.newTabSpec("1").setIndicator("layout_1").setContent(R.id.layout_1)
);
tabHost.addTab(
tabHost.newTabSpec("2").setIndicator("layout_2").setContent(R.id.layout_2)
);
}
}
第二种TabHost的写法:
activity_main.xml文件中几乎一样的要求,但是其中的TabHost的id可以自定义。
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabHost tabHost = findViewById(R.id.myTabHost);
//启动tabHost
tabHost.setup();
TabHost.TabSpec spec1 = tabHost.newTabSpec("1");
spec1.setIndicator("layout_1");
spec1.setContent(R.id.layout_1);
TabHost.TabSpec spec2 = tabHost.newTabSpec("2");
spec2.setIndicator("layout_2");
spec2.setContent(R.id.layout_2);
//别忘了添加到tabHost中
tabHost.addTab(spec1);
tabHost.addTab(spec2);
}
}