Android PopupMenu弹出菜单的实现
（1）布局文件：用于弹出菜单的处罚button：
代码语言：javascript复制<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
<Button
android:id="@ id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="96dp"
android:layout_marginTop="111dp"
android:onClick="showPopup"
android:text="弹出菜单" /
</RelativeLayout （2）res-menu目录下的main.xml文件：
代码语言：javascript复制<menu xmlns:android="http://schemas.android.com/apk/res/android"
<item
android:id="@ id/open"
android:orderInCategory="100"
android:showAsAction="never"
android:title="@string/open"/
<item
android:id="@ id/close"
android:orderInCategory="100"
android:showAsAction="never"
android:title="@string/close"/
</menu （3）类的文件：
代码语言：javascript复制package com.example.menu_popupmenu;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.PopupMenu;
public class MainActivity extends Activity {
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void showPopup(View view) {
PopupMenu popupMenu = new PopupMenu(MainActivity.this, view);
popupMenu.getMenuInflater().inflate(R.menu.main, popupMenu.getMenu());
popupMenu.show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
} 
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