android对话框应用

啥都别说了，看效果吧！
1代码 
new AlertDialog.Builder(Lesson_01_Pic.this).setTitle("提示标题").setMessage("这是提示内容").show();    
 
2代码 
new AlertDialog.Builder(Lesson_01_Pic.this)   
         .setTitle("这是标题")   
        .setMessage("这是提示内容")    
        .setPositiveButton("确定",    
        new DialogInterface.OnClickListener(){   
                  public void onClick(DialogInterface dialoginterface, int i){    
                                 //按钮事件    
                           Toast.makeText(Lesson_01_Pic.this, "确定",Toast.LENGTH_LONG).show();   
                              }    
                     }).show();    
 
3代码 
import android.app.Activity;   
 import android.app.AlertDialog;   
 import android.app.Dialog;   
 import android.content.DialogInterface;   
 import android.content.DialogInterface.OnClickListener;   
 import android.content.DialogInterface.OnMultiChoiceClickListener;   
 import android.os.Bundle;   
 import android.view.View;   
 import android.widget.Button;   
 import android.widget.Toast;   
 public class Lesson_02_Dia extends Activity {   
     /** Called when the activity is first created. */   
     @Override   
     public void onCreate(Bundle savedInstanceState) {   
         super.onCreate(savedInstanceState);   
         setContentView(R.layout.main);   
            
         Button button = (Button)findViewById(R.id.b01);   
         button.setText("对话框");   
         button.setOnClickListener(new Button.OnClickListener(){   
             @Override   
             public void onClick(View v) {   
                 //选项数组   
                 String[] choices={"Facebook","Twitter"};   
                 //Check判断数组，与选项对应   
                 boolean[] chsBool = {tr