屏幕旋转Activity的生命周期变化-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_3028/article/details/81922714

本文详细介绍了当Android应用中的Activity遇到屏幕旋转时的行为变化。通过配置`configChanges`属性可以避免因屏幕旋转导致的Activity重启，默认情况下屏幕旋转会触发Activity的销毁与重建过程。文章还提供了具体的生命周期回调函数调用顺序示例。

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屏幕旋转 Activity 的生命周期变化：

1、Activity 不重启请在 AndroidManifest.xml 设置如下：

......

......

2、如果不设置则启动如下：

第一次执行
onCreate(null)
onStart()
onPostCreate()
onResume()
onPostResume()

可将屏幕旋转以后：

onSaveInstanceState()
onPause()
onStop()
onDestroy()
onCreate(Bundle[{android:viewHierarchyState=Bundle[{android:views=android.util.SparseArray@43370a48}], key=123}])
onStart()
onRestoreInstanceState()
onPostCreate()
onResume()
onPostResume()

onDestroy() 证明杀掉了你的 activity， onCreate() 又重新启动了你的 activity

代码：

......

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_dialog_activity);

Log.w("Test", "onCreate(" + savedInstanceState + ")");
}

protected void onRestart() {
super.onRestart();
Log.w("Test", "onRestart()");
}

protected void onStart() {
super.onStart();
Log.w("Test", "onStart()");
}

protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
Log.w("Test", "onRestoreInstanceState()");
}

protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
Log.w("Test", "onPostCreate()");
}

protected void onResume() {
super.onResume();
Log.w("Test", "onResume()");
}

protected void onPostResume() {
super.onPostResume();
Log.w("Test", "onPostResume()");
}

protected void onSaveInstanceState(Bundle outState) {
  outState.putInt("key", 123);
  super.onSaveInstanceState(outState);
  Log.w("Test", "onSaveInstanceState()");
}

protected void onPause() {
super.onPause();
Log.w("Test", "onPause()");
}

protected void onStop() {
super.onStop();
Log.w("Test", "onStop()");
}

protected void onDestroy() {
super.onDestroy();
Log.w("Test", "onDestroy()");
}

protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
Log.w("Test", "onNewIntent()");
}

.....