1 package activityLaunchStandard;
 2 
 3 
 4 
 5 
 6 import com.example.activityLaunchStandard.R;
 7 
 8 import android.app.Activity;
 9 import android.content.Intent;
10 import android.os.Bundle;
11 import android.view.View;
12 import android.view.View.OnClickListener;
13 import android.widget.Button;
14 
15 
16 
17 public class MainActivity extends Activity{
18     private Button btn_openActivty;//创建一个button对象
19      protected void onCreate(Bundle savedInstanceState) {
20             super.onCreate(savedInstanceState);//父类操作
21             setContentView(R.layout.activity_main);//引入名为activity_main的界面
22             btn_openActivty=(Button) findViewById(R.id.btn_openActivity);//找id为btn_openActivity的button
23             btn_openActivty.setOnClickListener(new OnClickListener() {//设置button点击监听
24                 
25                 @Override
26                 public void onClick(View v) {//onclick事件
27                     // TODO Auto-generated method stub
28                     Intent intent=new Intent();//初始化intent
29                     intent.setClass(MainActivity.this,MainActivity.class);//连接三
30                     startActivity(intent);//打开activity
31                 }
32             });
33         }
34 }