【代码】利用Android的Log 演示一个activity的生命周期
16lz
2021-01-23
代码：//DemoActivity.javapackage uni.activity;/* @author octobershiner 2011 7 22 SE.HIT*/import android.app.Activity;import android.os.Bundle;import android.util.Log;public class ActivityDemoActivity extends Activity { /** Called when the activity is first created. */ private static final String TAG = "demo"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Log.d("demo", "this is a test string "); } protected void onStart(){ super.onStart(); Log.i(TAG, "The activity state---->onStart"); } protected void onRestart(){ super.onRestart(); Log.i(TAG, "The activity state---->onReatart"); } protected void onResume(){ super.onResume(); Log.i(TAG, "The activity state---->onResume"); } protected void onPause(){ super.onPause(); Log.i(TAG, "The activity state---->onPause"); } protected void onStop(){ super.onStop(); Log.i(TAG, "The activity state---->onStop"); } protected void onDestroy(){ super.onDestroy(); Log.i(TAG, "The activity state---->onDestroy"); } } 演示sundy留的小作业 截取LOG
这是演示的结果
//注释表示 中间执行的操作 为方便的观察数据，可以在LOGCAT窗口（没有的话可以在window菜单中的show view中调出）的右侧单击加号创建一个过滤器，我的例子中过滤的是demo
//开始运行demo
07-22 11:18:19.311: INFO/demo(281): The activity state---->onStart
07-22 11:18:19.311: INFO/demo(281): The activity state---->onResume
//按下了back键 返回 activity从stack中弹出
07-22 11:18:34.821: INFO/demo(281): The activity state---->onPause
07-22 11:18:35.090: INFO/demo(281): The activity state---->onStop
07-22 11:18:35.090: INFO/demo(281): The activity state---->onDestroy
//再次启动demo
07-22 11:18:45.550: INFO/demo(281): The activity state---->onStart
07-22 11:18:45.550: INFO/demo(281): The activity state---->onResume
//按下了HOME键 当前TASK 处于后台转态，系统保存状态
07-22 11:18:53.750: INFO/demo(281): The activity state---->onPause
07-22 11:18:54.820: INFO/demo(281): The activity state---->onStop
//再次启动demo 回复原来的TASK activity在栈顶
07-22 11:19:03.550: INFO/demo(281): The activity state---->onReatart
07-22 11:19:03.550: INFO/demo(281): The activity state---->onStart
07-22 11:19:03.550: INFO/demo(281): The activity state---->onResume
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