android开发ui层都是建立在activity的基础上，也是整个android的四大组件之一。那么activity各阶段的生命方法的调用又是怎样的呢？让我们来一起探索-----------

一.activity被启动的阶段

1.protected void onApplyThemeResource(Theme theme, int resid, boolean first) {}

2.public View onCreateView(String name, Context context, AttributeSet attrs){}

3.public void onContentChanged(){}

4.protected void onCreate(Bundle savedInstanceState){}

5.protected void onStart(){}

6.protected void onResume(){}

7.public void onAttachedToWindow(){}

8.public View onCreatePanelView(int featureId){}

二.二个activity之间的跳转过程（A--->B）

1.A调用protected void onPause(){}

2.B走完一个完整的acitivy启动阶段的方法（activity被启动的阶段）

3.A调用protected void onSaveInstanceState(Bundle outState){}

4.A调用protected void onStop(){}

三.二个activity，当A启动B，在由B返回到A的过程

1.B调用protected void onPause(){}

2.A调用protected void onRestart(){}

3.A调用protected void onStart(){}

4.A调用protected void onResume(){}

5.B调用protected void onStop(){}

6.B调用protected void onDestroy()

7.B调用public void onDetachedFromWindow()

四.activity退出的过程

1.protected void onPause(){}

2.protected void onStop(){}

3.protected void onDestroy(){}

4.public void onDetachedFromWindow()

五.电源键被按时的过程

按电源键关闭屏幕

1.protected void onPause(){}

2.protected void onSaveInstanceState(Bundle outState){}

3.protected void onStop(){}

按电源键重新进入屏幕

1.protected void onRestart(){}

2.protected void onRestart(){}

3.protected void onResume()

六.home键的点击和重启启用的过程和电源键一致