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运行Activity(没有切换屏幕的正常情况下启动Activity)，得到如下结果：
 
 
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，重新启动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：