android - 为什么 `android:screenOrientation="后面"` 在 android 4.1.2 中没有效果？

Question

作为一个测试示例，有一个应用程序有 2 个 Activity :MainActivity，它在按钮单击时启动 SecondActivity。
它在 Android 4.0.4 上运行良好，但在 Android 4.1.2 上我遇到了意外行为。

系统设置中的 AutoRotation 已关闭(或已打开 - 没关系，“后面”选项无论如何都会被忽略)。
android:screenOrientation="landscape" 设置为 MainActivity 并且 android:screenOrientation="behind" 设置为 SecondActivity，这意味着SecondActivity也必须横向启动。
对于 Android 4.0.4 是这样，但在 Android 4.1.2 上 SecondActivity 以纵向开始。

AndroidManifest.xml:

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="16" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.my.example.testbehindorientation.MainActivity"
        android:label="@string/app_name"
        android:screenOrientation="landscape" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name="com.my.example.testbehindorientation.SecondActivity"
        android:configChanges="screenSize|orientation"
        android:label="@string/title_activity_second"
        android:screenOrientation="behind" >
    </activity>
</application>

SecondActivity.java:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);
    logOrientation("onCreate");
}


@Override
protected void onDestroy() {
    super.onDestroy();
    logOrientation("onDestroy");
}

@Override
protected void onResume() {
    super.onResume();
    logOrientation("onResume");
}

private void logOrientation(String prefix) {
        int requestedOrientation = this.getRequestedOrientation();
        WindowManager lWindowManager =  (WindowManager) getSystemService(WINDOW_SERVICE);
        Configuration cfg = getResources().getConfiguration();
        int lRotation = lWindowManager.getDefaultDisplay().getRotation();   
        int orientation = cfg.orientation;
        Log.i(LOG_TAG, prefix + ", requestedOrientation is " + requestedOrientation + ", rotation is " + lRotation + ", orientation is " + orientation);
}

AndroidManifest.xml 中没有 android:configChanges="screenSize|orientation" 行的日志输出，用于 ​​SecondActivity 在 中单击按钮后主 Activity :

onCreate, requestedOrientation is 3, rotation is 1, orientation is 2
onResume, requestedOrientation is 3, rotation is 1, orientation is 2
onDestroy, requestedOrientation is 3, rotation is 0, orientation is 1
onCreate, requestedOrientation is 3, rotation is 0, orientation is 1
onResume, requestedOrientation is 3, rotation is 0, orientation is 1

使用 AndroidManifest.xml 中包含的 android:configChanges="screenSize|orientation" 行记录:

onCreate, requestedOrientation is 3, rotation is 1, orientation is 2
onResume, requestedOrientation is 3, rotation is 1, orientation is 2

现在没有 Activity 重新创建，但结果始终相同 - SecondActivity 以纵向开始! :( 也就是说，SecondActivity在onResume之后由于某种原因旋转为纵向。 为什么？

测试于:

• 搭载 Android 4.0.4 的三星 Galaxy S3(正常)
• 搭载 Android 4.1 的三星 Galaxy S3。？ (错误)
• 带有 Android 4.1.2 的模拟器，带有纵向主屏幕方向(错误)
• Android 4.0.3 模拟器(好的)
• Android 4.2 模拟器(错误)

Answer 1

如果您在使用 list 更改方向时遇到问题，您可以在 java 中更改方向。这是 list 和 Activity 的完整代码。

Manifest.xml

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="16" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.my.example.testbehindorientation.MainActivity"
        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.my.example.testbehindorientation.SecondActivity"
        android:configChanges="screenSize|orientation"
        android:label="@string/title_activity_second" >
    </activity>
</application>

横向的第二个 Activity

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);            
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);//Change according to need this is for landscape
    logOrientation("onCreate");
}


@Override
protected void onDestroy() {
    super.onDestroy();
    logOrientation("onDestroy");
}

@Override
protected void onResume() {
    super.onResume();
    logOrientation("onResume");
}

private void logOrientation(String prefix) {
        int requestedOrientation = this.getRequestedOrientation();
        WindowManager lWindowManager =  (WindowManager) getSystemService(WINDOW_SERVICE);
        Configuration cfg = getResources().getConfiguration();
        int lRotation = lWindowManager.getDefaultDisplay().getRotation();   
        int orientation = cfg.orientation;
        Log.i(LOG_TAG, prefix + ", requestedOrientation is " + requestedOrientation + ", rotation is " + lRotation + ", orientation is " + orientation);
}

在MainActivity的onCreate()方法中添加如下代码

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);//Change according to need this is for landscape