Activity Lifecycle

来源：互联网发布：取色笔淘宝编辑：程序博客网时间：2024/04/29 00:05

备注：Android系统版本5.1.1

Activity是一个可视化的用户界面，是Android程序与用户交互的窗口，能响应所有窗口事件，具备有控件，菜单等界面元素。Activity需要为了保持各个界面状态，需要做很多持久化的事情，还需要妥善管理生命周期，和一些转跳逻辑。

代码片段：public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Log.i("lifecycle","onCreate");    }    @Override    protected void onStart() {        super.onStart();        Log.i("lifecycle","onStart");    }    @Override    protected void onResume() {        super.onResume();        Log.i("lifecycle","onResume");    }    @Override    protected void onPause() {        super.onPause();        Log.i("lifecycle","onPause");    }    @Override    protected void onStop() {        super.onStop();        Log.i("lifecycle","onStop");    }    @Override    protected void onDestroy() {        super.onDestroy();        Log.i("lifecycle","onDestroy");    }    @Override    protected void onRestart() {        super.onRestart();        Log.i("lifecycle","onRestart");    }}

结果分析：

启动app
09-18 21:26:31.984 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onCreate
09-18 21:26:31.984 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onStart
09-18 21:26:31.994 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onResume
点击home
09-18 21:27:25.294 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onPause
09-18 21:27:25.554 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onStop
在任务栏重新打开app
09-18 21:28:04.484 4377-5627/? D/LifecycleResourceManager: begin check cache…
09-18 21:28:05.284 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onRestart
09-18 21:28:05.294 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onStart
09-18 21:28:05.294 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onResume
点击back
09-18 21:28:36.804 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onPause
09-18 21:28:37.074 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onStop
09-18 21:28:37.074 30822-30822/servicedemo.example.com.myapplication I/lifecycle: onDestroy

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