android之activity生命周期图

第一个activity

 1 package good.go;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.Button;
 8 import android.widget.Toast;
 9 
10 public class TestProcActivity extends Activity {
11     /** Called when the activity is first created. */
12 
13     private Button btn = null;
14 
15     @Override
16     public void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.main);
19 
20         Toast.makeText(getApplicationContext(), "on create", 2000).show();
21 
22         btn = (Button) findViewById(R.id.good);
23         btn.setOnClickListener(new View.OnClickListener() {
24 
25             @Override
26             public void onClick(View v) {
27                 // TODO Auto-generated method stub
28                 Intent i = new Intent();
29                 i.setClass(TestProcActivity.this, num.class);
30                 startActivity(i);
31             }
32         });
33 
34     }
35 
36     @Override
37     protected void onStart() {
38         // TODO Auto-generated method stub
39         Toast.makeText(getApplicationContext(), "on start", 2000).show();
40         super.onStart();
41     }
42 
43     @Override
44     protected void onRestart() {
45         // TODO Auto-generated method stub
46         Toast.makeText(getApplicationContext(), "on restart", 2000).show();
47         super.onRestart();
48     }
49 
50     @Override
51     protected void onResume() {
52         // TODO Auto-generated method stub
53         Toast.makeText(getApplicationContext(), "on resume", 2000).show();
54         super.onResume();
55     }
56 
57     @Override
58     protected void onPause() {
59         // TODO Auto-generated method stub
60         Toast.makeText(getApplicationContext(), "on pause", 2000).show();
61         super.onPause();
62     }
63 
64     @Override
65     protected void onStop() {
66         // TODO Auto-generated method stub
67         Toast.makeText(getApplicationContext(), "on stop", 2000).show();
68         super.onStop();
69     }
70 
71     @Override
72     protected void onDestroy() {
73         // TODO Auto-generated method stub
74         Toast.makeText(getApplicationContext(), "on destory", 2000).show();
75         super.onDestroy();
76     }
77 
78 }

第二个activity（对话框风格）

 1 package good.go;
 2 
 3 import android.app.*;
 4 import android.os.*;
 5 import android.widget.Toast;
 6 
 7 public class num extends Activity {
 8 
 9     @Override
10     protected void onCreate(Bundle savedInstanceState) {
11         // TODO Auto-generated method stub
12         Toast.makeText(getApplicationContext(), "num --on create", 2000).show();
13         super.onCreate(savedInstanceState);
14     }
15 
16     @Override
17     protected void onStart() {
18         // TODO Auto-generated method stub
19         Toast.makeText(getApplicationContext(), "num --on start", 2000).show();
20         super.onStart();
21     }
22 
23     @Override
24     protected void onRestart() {
25         // TODO Auto-generated method stub
26         Toast.makeText(getApplicationContext(), "num --on restart", 2000)
27                 .show();
28         super.onRestart();
29     }
30 
31     @Override
32     protected void onResume() {
33         // TODO Auto-generated method stub
34         Toast.makeText(getApplicationContext(), "num --on resume", 2000).show();
35         super.onResume();
36     }
37 
38     @Override
39     protected void onPause() {
40         // TODO Auto-generated method stub
41         Toast.makeText(getApplicationContext(), "num --on pause", 2000).show();
42         super.onPause();
43     }
44 
45     @Override
46     protected void onStop() {
47         // TODO Auto-generated method stub
48         Toast.makeText(getApplicationContext(), "num --on stop", 2000).show();
49         super.onStop();
50     }
51 
52     @Override
53     protected void onDestroy() {
54         // TODO Auto-generated method stub
55         Toast.makeText(getApplicationContext(), "num --on destroy", 2000)
56                 .show();
57         super.onDestroy();
58     }
59 
60 }

manifest

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="good.go"
 4     android:versionCode="1"
 5     android:versionName="1.0" >
 6 
 7     <uses-sdk android:minSdkVersion="7" />
 8 
 9     <application
10         android:icon="@drawable/ic_launcher"
11         android:label="@string/app_name" >
12         <activity
13             android:name=".TestProcActivity"
14             android:label="@string/app_name" >
15             <intent-filter>
16                 <action android:name="android.intent.action.MAIN" />
17 
18                 <category android:name="android.intent.category.LAUNCHER" />
19             </intent-filter>
20         </activity>
21         <activity
22             android:name=".num"
23             android:label="@string/app_name"
24             android:theme="@android:style/Theme.Dialog" >
25         </activity>
26     </application>
27 
28 </manifest>

无论在一个activity中哪个函数中调用 startactivity，都会经历一个活动状态的变迁过程，而不是立即跳转到别的activity中执行，所以了解android的

生命周期的过程，对了解程序的执行和分布是很有意义的。

原图连接： http://blog.csdn.net/android_tutor/article/details/5772285

最好的是在写程序的时候加上与调试相关的代码，这样能避免一些自己想不到的错误。同时也能帮助自己理解生命周期这个概念。