activity生命周期图解:
测试类:
package com.zizhu.lifecycle; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; public class Lifecycle_activityActivity extends Activity { public static final String TAG = "Lifecycle_activityActivity"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Log.i(TAG, "onCreate method invoked!"); } public void openStopActitity(View view){ startActivity(new Intent(this, StopActivity.class)); } public void openPauseActitity(View view){ startActivity(new Intent(this, PauseActivity.class)); } @Override protected void onStart() { Log.i(TAG, "onStart method invoked!"); super.onStart();//调用父类的方法不能删除,用于管理生命周期 } @Override protected void onRestart() { Log.i(TAG, "onRestart method invoked!"); super.onRestart(); } @Override protected void onResume() { Log.i(TAG, "onResume method invoked!"); super.onResume(); } @Override protected void onPause() { Log.i(TAG, "onPause method invoked!"); super.onPause(); } @Override protected void onStop() { Log.i(TAG, "onStop method invoked!"); super.onStop(); } @Override protected void onDestroy() { Log.i(TAG, "onDestroy method invoked!"); super.onDestroy(); } }
1.当打开activity的时候:调用 onCreate,onStart,onResume三个方法
2.当打开PauseActivity的时候,PauseActivity是对话形式的Activity,调用onPause方法
3.按下返回健,让其回到MainActivity,调用onResume方法
4.当打开StopActivity的时候,StopActivity会全部覆盖MainActivity,调用onPause,onStop两个方法
5.再次按下返回健,回到MainActivity,调用onRestart,onStart,onResume三个方法
6.按下返回健,回到主桌面,调用onPause,onStop,onDestroy三个方法,Activity生命周期结束