package com.fish.helloworld;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.os.Bundle;import android.util.Log;import android.view.KeyEvent;import android.view.Menu;import android.view.MenuItem;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;public class MainActivity extends Activity {    private Button1_OnClickListener m_Button1Listener = new Button1_OnClickListener();    class Button1_OnClickListener implements OnClickListener{        public void onClick(View v){            new AlertDialog.Builder(MainActivity.this)                                .setTitle("标题")                              .setMessage("简单消息框")                              .setPositiveButton("确定", null)                              .show();         }    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.skeleton_activity);                Button m_Button1 = (Button)findViewById(R.id.button8);        m_Button1.setOnClickListener(m_Button1Listener);    }    }

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button        android:id="@+id/button8"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="极端对话框" />    <Button        android:id="@+id/button1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="OK Cancel dialog with a message" />    <Button        android:id="@+id/button2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="OK Cancel dialog with a long message" />    <Button        android:id="@+id/button3"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="List dialog" />    <Button        android:id="@+id/button4"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Progress dialog" />    <Button        android:id="@+id/button5"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Single Choice dialog" />    <Button        android:id="@+id/button6"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Repeat alarm" />    <Button        android:id="@+id/button7"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Text Entry dialog" /></LinearLayout>