Android PopupMenu弹出菜单的实现

Android PopupMenu弹出菜单的实现

（1）布局文件：用于弹出菜单的处罚button：

<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：

<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：

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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