Android生命周期(三)

一个Android应用程序的生命周期用以下图解释再清楚不过了.

创建一个demo,代码如下：

public class MainActivity extends Activity {

	private static final String TAG = "Android_life";
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		Log.i(TAG,"onCtreate()");
		setContentView(R.layout.activity_main);
	}
	
	protected void onStart() {
		super.onStart();
		Log.i(TAG,"onStart()");
	}
	
	protected void onResume() {
		super.onResume();
		Log.i(TAG,"onResume()");
	}
	
	protected void onPause() {
		super.onPause();
		Log.i(TAG,"onPause()");
	}
	protected void onDestroy() {
		super.onDestroy();
		Log.i(TAG,"onDestroy()");
	}

运行程序的效果如下：

03-10 20:38:11.531: I/Android_life(4635): onCtreate()
03-10 20:38:11.641: I/Android_life(4635): onStart()
03-10 20:38:11.641: I/Android_life(4635): onResume()

2)关闭手机屏幕

03-10 20:38:11.531: I/Android_life(4635): onCtreate()
03-10 20:38:11.641: I/Android_life(4635): onStart()
03-10 20:38:11.641: I/Android_life(4635): onResume()
03-10 20:38:29.451: I/Android_life(4635): onPause()

3）激活手机屏幕

03-10 20:38:11.531: I/Android_life(4635): onCtreate()
03-10 20:38:11.641: I/Android_life(4635): onStart()
03-10 20:38:11.641: I/Android_life(4635): onResume()
03-10 20:38:29.451: I/Android_life(4635): onPause()
03-10 20:53:51.631: I/Android_life(4635): onStart()
03-10 20:53:51.731: I/Android_life(4635): onResume()

4）退出该应用程序，可以看到日志

03-10 20:57:51.161: I/Android_life(5779): onDestroy()