Android Activity 的生命周期流程顺序

从此篇博文开始会一 一记录自己的Android学习之路，方便自己查缺补漏及与各位大佬交流。

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• Activity实际上是继承了ApplicationContext这个类

 public class Activity extends ApplicationContext {             protected void onCreate(Bundle savedInstanceState);             protected void onStart();                protected void onRestart();             protected void onResume();             protected void onPause();             protected void onStop();             protected void onDestroy();         }  

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程序调试观察函数顺序

import android.app.Activity;import android.os.Bundle;import android.util.Log;public class MainActivity extends Activity {    private static final String TAG = "ActivityDemo";    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Log.e(TAG, "start onCreate~~~");    }    @Override    protected void onStart() {        super.onStart();        Log.e(TAG, "start onStart~~~");    }    @Override    protected void onRestart() {        super.onRestart();        Log.e(TAG, "start onRestart~~~");    }    @Override    protected void onResume() {        super.onResume();        Log.e(TAG, "start onResume~~~");    }    @Override    protected void onPause() {        super.onPause();        Log.e(TAG, "start onPause~~~");    }    @Override    protected void onStop() {        super.onStop();        Log.e(TAG, "start onStop~~~");    }    @Override    protected void onDestroy() {        super.onDestroy();        Log.e(TAG, "start onDestroy~~~");    }}

启动程序：
onCreate()–>onStart()–>onResume()

按返回键：
onPause()–>onStop()–>onDestroy()

按Home键：
onPause()–>onStop()

注意：此时并没有执行onDestroy()

再次启动程序：
onRestart()–>onStart()–>onResume()

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整体结构

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