Android四大组件之——Activity的生命周期（图文详解）

//创建Activity
public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
//Activity快要变成可见的
    @Override
    protected void onStart() {
        super.onStart();
    }
//Activity变成可见的，处于运行状态
    @Override
    protected void onResume() {
        super.onResume();
    }
//其他Activity获得用户焦点，（Activity快要暂停了）
    @Override
    protected void onPause() {
        super.onPause();
    }
//Activity不再可见，处于停止状态
    @Override
    protected void onStop() {
        super.onStop();
    }
//Activity快要被销毁了
    @Override
    protected void onDestroy() {
        super.onDestroy()；
   ｝
  }

 1 package com.example.activitytest;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.util.Log;
 7 import android.view.View;
 8 import android.view.View.OnClickListener;
 9 import android.widget.Button;
10 
11 public class MainActivity extends Activity {
12   
13     private Button btn;
14     private static final String TAG = "ActivityTest";
15     @Override
16     protected void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         Log.d(TAG, "MainActivity onCreate");
19         setContentView(R.layout.activity_main);
20         btn = (Button)findViewById(R.id.btn);
21         btn.setOnClickListener(new OnClickListener() {
22             
23             @Override
24             public void onClick(View v) {
25                    Intent intent = new Intent(MainActivity.this,SecondActivity.class);
26                    startActivity(intent);
27             }
28         });
29         
30     }
31     @Override
32     protected void onPause() {
33         Log.d(TAG, "MainActivity onPause  ");
34         super.onPause();
35     }
36     @Override
37     protected void onResume() {
38         Log.d(TAG, "MainActivity onResume  ");
39         super.onResume();
40     }
41     @Override
42     protected void onStart() {
43         super.onStart();
44         Log.d(TAG,"MainActivity onStart  ");
45     }
46     @Override
47     protected void onStop() {
48         super.onStop();
49         Log.d(TAG, "MainActivity onStop  ");
50     }
51     @Override
52     protected void onDestroy() {
53         super.onDestroy();
54         Log.d(TAG, "MainActivity onDestroy  ");
55     }
56     @Override
57     protected void onRestart() {
58         super.onRestart();
59         Log.d(TAG, "MainActivity onRestart  ");
60     }
61 }