onWindowFocusChanged

CSDN

程序真的可见时，会调用onWindowFocusChanged,从这时候起，用户可以与应用程序进行交互了。
下面的测试是以Android 5.1.1,坚果手机为例，不同的版本，不同的定制系统可能略有不同。

这是一个Activity从进入到退出的过程。

  1. com.yan.legacy.MainActivity: onCreate
  2. com.yan.legacy.MainActivity: onStart
  3. com.yan.legacy.MainActivity: onResume
  4. com.yan.legacy.MainActivity: attachedToWindow
  5. com.yan.legacy.MainActivity: onWindowFocusChanged
  6. 程序运行
  7. com.yan.legacy.MainActivity: onWindowFocusChanged
  8. com.yan.legacy.MainActivity: onPause
  9. com.yan.legacy.MainActivity: onStop
  10. com.yan.legacy.MainActivity: onDestroy

这是一个Activity从进入到进入下一个activity到返回自身的过程

  1. com.yan.legacy.MainActivity: onCreate
  2. com.yan.legacy.MainActivity: onStart
  3. com.yan.legacy.MainActivity: onResume
  4. com.yan.legacy.MainActivity: attachedToWindow
  5. com.yan.legacy.MainActivity: onWindowFocusChanged
  6. 程序运行
  7. 点击一个按钮进入下一个activity
  8. com.yan.legacy.MainActivity: onPause
  9. com.yan.legacy.MainActivity: onWindowFocusChanged
  10. com.yan.legacy.MainActivity: onStop
  11. 返回自身
  12. com.yan.legacy.MainActivity: onRestart
  13. com.yan.legacy.MainActivity: onStart
  14. com.yan.legacy.MainActivity: onResume
  15. com.yan.legacy.MainActivity: onWindowFocusChanged

下面是一个activity从进入到锁屏经历的声明周期

  1. com.yan.legacy.MainActivity: onCreate
  2. com.yan.legacy.MainActivity: onStart
  3. com.yan.legacy.MainActivity: onResume
  4. com.yan.legacy.MainActivity: attachedToWindow
  5. com.yan.legacy.MainActivity: onWindowFocusChanged
  6. 程序运行
  7. 锁屏
  8. com.yan.legacy.MainActivity: onPause
  9. com.yan.legacy.MainActivity: onStop
  10. com.yan.legacy.MainActivity: onWindowFocusChanged
  11. 开锁
  12. com.yan.legacy.MainActivity: onRestart
  13. com.yan.legacy.MainActivity: onStart
  14. com.yan.legacy.MainActivity: onResume
  15. com.yan.legacy.MainActivity: onWindowFocusChanged

下面是一个activity从进入到按Home退回桌面，然后再进入的过程

  1. com.yan.legacy.MainActivity: onCreate
  2. com.yan.legacy.MainActivity: onStart
  3. com.yan.legacy.MainActivity: onResume
  4. com.yan.legacy.MainActivity: attachedToWindow
  5. com.yan.legacy.MainActivity: onWindowFocusChanged
  6. 程序运行
  7. 按Home
  8. com.yan.legacy.MainActivity: onPause
  9. com.yan.legacy.MainActivity: onWindowFocusChanged
  10. com.yan.legacy.MainActivity: onStop
  11. 再次进入
  12. com.yan.legacy.MainActivity: onRestart
  13. com.yan.legacy.MainActivity: onStart
  14. com.yan.legacy.MainActivity: onResume
  15. com.yan.legacy.MainActivity: onWindowFocusChanged

与进入下一个activity相同，与锁屏唯一不同的是onWindowFocusChanged，可能是因为桌面更早的获得了焦点。

弹出一个Dialog，Activity仍可见时如下

  1. com.yan.legacy.MainActivity: onCreate
  2. com.yan.legacy.MainActivity: onStart
  3. com.yan.legacy.MainActivity: onResume
  4. com.yan.legacy.MainActivity: attachedToWindow
  5. com.yan.legacy.MainActivity: onWindowFocusChanged
  6. 程序运行
  7. 弹窗出来
  8. com.yan.legacy.MainActivity: onWindowFocusChanged

下面是一个activity从进入到弹出一个Theme为Dialog的Activity时的过程

  1. com.yan.legacy.MainActivity: onCreate
  2. com.yan.legacy.MainActivity: onStart
  3. com.yan.legacy.MainActivity: onResume
  4. com.yan.legacy.MainActivity: attachedToWindow
  5. com.yan.legacy.MainActivity: onWindowFocusChanged
  6. 程序运行
  7. 弹出Dialog样式的Activity
  8. com.yan.legacy.MainActivity: onPause
  9. com.yan.legacy.MainActivity: onWindowFocusChanged
  10. 返回
  11. com.yan.legacy.MainActivity: onResume
  12. com.yan.legacy.MainActivity: onWindowFocusChanged

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