从“第二个活动”中按下“上一步”按钮时，第一个“活动”将被销毁

Question

我正在实现一个播放在线视频的Android应用程序，但收到了错误。为了简单起见，我在这里制作了一个示例应用程序。共有2个活动：MainActivity和SecondActivity。

MainActivity
public class MainActivity extends Activity {
    public static String TAG = "MainActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.e(TAG, "onCreate");
        setContentView(R.layout.activity_main);
        ((Button)findViewById(R.id.btn)).setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
                startActivity(intent);
            }
        });
    }
    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        Log.e(TAG, "onStart");
    }
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        Log.e(TAG, "onResume");
    }
    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        Log.e(TAG, "onStop");
    }
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        Log.e(TAG, "onDestroy");
    }
}
SecondActivity
public class SecondActivity extends Activity {
    public static String TAG = "SecondActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
    }
    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        Log.e(TAG, "onStart");
    }
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        Log.e(TAG, "onResume");
    }
    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        Log.e(TAG, "onStop");
    }
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        Log.e(TAG, "onDestroy");
    }
    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        // TODO Auto-generated method stub
        super.onConfigurationChanged(newConfig);
        Log.e(TAG, "onConfigurationChanged");
    }
}
AndroidManifiest.xml    
    <activity
        android:name="com.example.androidtest.MainActivity"
        android:screenOrientation="portrait"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name="com.example.androidtest.SecondActivity"
        android:label="@string/title_activity_second" 
        android:configChanges="orientation|keyboardHidden|screenSize"
        android:screenOrientation="portrait">
    </activity>

在MainActivity中有一个启动SecondActivity的按钮。我的场景是将设备置于横向模式，然后单击按钮启动SecondActivity（使SecondActivity自动旋转到横向模式）。然后立即按下返回按钮返回MainActivity。但MainActivity被破坏了。这是我的日志：

12-11 22:22:20.940: E/MainActivity(400): onCreate
12-11 22:22:20.960: E/MainActivity(400): onStart
12-11 22:22:20.960: E/MainActivity(400): onResume
12-11 22:22:24.524: E/SecondActivity(400): onStart
12-11 22:22:24.524: E/SecondActivity(400): onResume
12-11 22:22:24.544: E/SecondActivity(400): onConfigurationChanged
12-11 22:22:24.634: E/MainActivity(400): onStop
12-11 22:22:24.634: E/MainActivity(400): onDestroy
12-11 22:22:34.133: E/SecondActivity(400): onStop
12-11 22:22:34.133: E/SecondActivity(400): onDestroy

MainActivity被破坏，当前活动为SecondActivity。如果我再按一次"后退"，SeconActivity将被销毁。任何人都可以解释为什么MainActivity被破坏，或者这是安卓操作系统的错误。提前谢谢
P/S：在这种情况下，将设备置于横向，然后单击按钮启动SecondActivity并立即按Back
其他情况都很好。

Answer 1

您的MainActivity正在循环中重新创建。为了防止在设备旋转时重新创建它，您需要与SecondActivity相同的configChanges:android:configChanges="orientation|keyboardHidden|screenSize"