Android开发教程 --- 葵花宝典第二层 Activity生命周期

public class MainActivity extends Activity {
    Button btn1;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        System.out.println("第一个活动（窗体）初始化------------- onCreate");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn1 =(Button) findViewById(R.id.btn1);
        btn1.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setClass(MainActivity.this, ResultActivity.class);
                startActivity(intent);
            }
        });
    }
    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        System.out.println("第一个活动（窗体）初始化完毕，并将要显示时------------- onStart");
    }
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        System.out.println("第一个活动（窗体）在即将于用户交互时------------- onResume");
    }
    
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        System.out.println("第一个活动（窗体）在系统即将启动第二个活动时------------- onPause");
    }
    
    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        System.out.println("第一个活动（窗体）在用户不可见时------------- onStop");
    }
     @Override
    protected void onRestart() {
       // TODO Auto-generated method stub
       super.onRestart();
       System.out.println("第一个活动（窗体）当重新启动时------------- onRestart");
    }
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        System.out.println("第一个活动（窗体）当活动销毁时------------- onDestroy");
    }
   
}

public class ResultActivity extends Activity {
    TextView txtResult;
    Button btn1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        System.out.println("第二个活动（窗体）初始化------------- onCreate");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.result);
        txtResult = (TextView)findViewById(R.id.txtResult);
        txtResult.setText("第二个窗体");
        btn1 = (Button)findViewById(R.id.btn1);
        
        btn1.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent();
                i.setClass(ResultActivity.this, MainActivity.class);
                startActivity(i);
            }
        });
    }
    
    
    
    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        System.out.println("第二个活动（窗体）初始化完毕，并将要显示时------------- onStart");
    }
    
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        System.out.println("第二个活动（窗体）在即将于用户交互时------------- onResume");
    }
    
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        System.out.println("第二个活动（窗体）在系统即将启动第二个活动时------------- onPause");
    }
    
    
    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        System.out.println("第二个活动（窗体）在用户不可见时------------- onStop");
    }
    
     @Override
    protected void onRestart() {
       // TODO Auto-generated method stub
       super.onRestart();
       System.out.println("第二个活动（窗体）当重新启动时------------- onRestart");
    }
     
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        System.out.println("第二个活动（窗体）当活动销毁时------------- onDestroy");
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="TSD.Jason.Example"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon" android:label="@string/app_name" android:debuggable="true">
        <activity android:name=".MainActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".ResultActivity"></activity>
    </application>
</manifest>