有关于android弹出框

package com.example.androiddialog1;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
        Button btn=(Button)findViewById(R.id.button1);
        btn.setOnClickListener(new OnClickListener() {
   
   public void onClick(View arg0) {
    
    AlertDialog.Builder builder=new Builder(MainActivity.this);
    builder.setTitle("王强");
    builder.setPositiveButton("确定", null);
    builder.setNegativeButton("取消", null);
    builder.setIcon(android.R.drawable.ic_dialog_info);
    builder.setMessage("王强是坏人了");
    builder.show();
    
   }
  });
       
       
       
        Button btn2=(Button)findViewById(R.id.button2);
        btn2.setOnClickListener(new OnClickListener() {
   
   public void onClick(View arg0) {
    
    AlertDialog.Builder builder=new Builder(MainActivity.this);
    builder.setTitle("何博中");
    builder.setIcon(android.R.drawable.ic_dialog_info);
    builder.setView(new EditText(MainActivity.this));
    builder.setNegativeButton("取消", null);
    builder.setPositiveButton("确定", null);
    builder.setMessage("xxxxxxx");
    builder.show();
    
    
    
   }
  });
       
       
       
        Button btn3=(Button)findViewById(R.id.button3);
        btn3.setOnClickListener(new MessageChcek());
       
        //弹出按钮
        Button btn4=(Button)findViewById(R.id.button4);
        btn4.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View arg0) {

    AlertDialog.Builder builder=new Builder(MainActivity.this);
    builder.setTitle("xxxx");
    builder.setIcon(android.R.drawable.ic_dialog_info);
    builder.setSingleChoiceItems(new String[]{"item1","item2","item3","item4"},
      0,
   new DialogInterface.OnClickListener(){
     public void onClick(DialogInterface dialog, int which){
      
           dialog.dismiss();
          } });
    builder.setNegativeButton("取消", null);
    builder.show();
    
   }
  });
       
       
       
       
        //弹出多选
        Button btn5=(Button)findViewById(R.id.btndialog);
        btn5.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View arg0) {
    AlertDialog.Builder builder=new Builder(MainActivity.this);
    builder.setTitle("mulitle");
    builder.setIcon(android.R.drawable.ic_dialog_info);
    builder.setMultiChoiceItems(new String[]{"item1","item2","item3","item4"},null, null);
    builder.setNegativeButton("取消", null);
    builder.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;
    }
   
    private final class MessageChcek implements View.OnClickListener
    {

  @Override
  public void onClick(View v) {
   
   
  Intent intent=new Intent();
  intent.putExtra("names", "123456");
  intent.setClass(MainActivity.this, CheckActive.class);
  startActivity(intent);
  MainActivity.this.finish();
   
   
  }
     
    }
   
  
   
  
   
}