Menu中弹出Dialog示例(一)

main.xml如下:

<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"    tools:context=".MainActivity"     >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        android:text="请点击菜单键" /></RelativeLayout>

dialog.xml如下:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView        android:id="@+id/textView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:textSize="20sp"        android:textColor="@android:color/white"        android:text="this is a dialog"      /></RelativeLayout>

main.xml如下:

<menu xmlns:android="http://schemas.android.com/apk/res/android" >       <item        android:id="@+id/exit"        android:icon="@drawable/ic_launcher"        android:title="退出"/>    <item        android:id="@+id/aboutme"        android:title="About me"/></menu>

MainActivity如下:

package com.wy;import android.os.Bundle;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.content.DialogInterface;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuInflater;import android.view.MenuItem;import android.view.View;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {MenuInflater menuInflater = this.getMenuInflater();menuInflater.inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {if (item.getItemId() == R.id.exit) {finish();}if(item.getItemId() == R.id.aboutme) {AlertDialog.Builder builder = new Builder(this);LayoutInflater inflater=getLayoutInflater();View xmlView=inflater.inflate(R.layout.dialog, null);builder.setView(xmlView);AlertDialog dialog=builder.create();dialog.setIcon(R.drawable.ic_launcher);dialog.setTitle("welcome");dialog.setButton("OK",new DialogInterface.OnClickListener() {public void onClick(DialogInterface clickedDialog, int arg1) {clickedDialog.cancel();}});dialog.show();}return super.onOptionsItemSelected(item);}}