Android 面试之横竖屏切换的Activity生命周期

public class EngineerJspActivity extends Activity {
private static String Tag = "EngineerJspActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(Tag, "onCreate()");
setContentView(R.layout.activity_main);
}
@Override
protected void onStart() {
super.onStart();
Log.d(Tag, "onStart()");
}
@Override
protected void onResume() {
super.onResume();
Log.d(Tag, "onResume()");
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Log.d(Tag, "onSaveInstanceState()");
}
@Override
protected void onPause() {
super.onPause();
Log.d(Tag, "onPause()");
}
@Override
protected void onStop() {
super.onStop();
Log.d(Tag, "onStop()");
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
Log.d(Tag, "onRestoreInstanceState()");
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.d(Tag, "onDestroy()");
}

}
②执行Activity(没有切换屏幕的正常情况下启动Activity)，得到例如以下结果：






③切换成横屏时的Activity生命周期：






④换回竖屏的Activity生命周期：






⑤给清单文件加上android:configChanges="orientation"属性。又一次启动Activity,没有切换屏幕时(正常启动)的生命周期：






⑥加上android:configChanges="orientation"属性。切换成横屏，Activity的生命周期：






⑦加上android:configChanges="orientation"属性。换回竖屏，Activity的生命周期：







⑧加上android:configChanges="orientation"keyboardHidden"属性。正常启动Activity的生命周期(未切屏幕)：






⑨加上android:configChanges="orientation"keyboardHidden"属性。正常启动Activity的生命周期(切成横屏)：






⑩加上android:configChanges="orientation"keyboardHidden"属性。正常启动Activity的生命周期(换回竖屏)：






执行Home键之后的生命周期：