锁定/解锁方向

Question

To lock my orientation to portrait, I use:

activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

I'm unsure what flag tells the activity to go back to relying on the device orientation. I imagine it is one of these:

SCREEN_ORIENTATION_FULL_SENSOR
SCREEN_ORIENTATION_SENSOR
SCREEN_ORIENTATION_UNSPECIFIED
SCREEN_ORIENTATION_USER

On another note, why isn't the android documentation open source? The documentation is completely lacking. Very few of the functions and flags have useful descriptions.

Answer 1

根据http://developer.android.com/reference/android/R.attr.html#screenOrientation （如果你SCREEN_ORIENTATION_SENSOR SCREEN_ORIENTATION_FULL_SENSOR文档，screenOrientation就是那些值链接到的那些）， SCREEN_ORIENTATION_SENSOR或SCREEN_ORIENTATION_FULL_SENSOR将会这样做，具体取决于多少您想要的灵活性 - 但是，我怀疑您真正想要的是返回默认设置，即SCREEN_ORIENTATION_UNSPECIFIED以便它返回到系统默认设置，包括任何用户设置。

Answer 2

An easy fix for this that worked for me is to add a line to AndroidManifest.xml like so:

Add android:screenOrientation="portrait"> in the application section.

<application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".App"
              android:label="@string/app_name"
              android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

</application>

Answer 3

如果此活动的应用程序manifest entry的“ android:immersive"属性设置为“ true ”，则ActivityInfo.flags成员始终设置其FLAG_IMMERSIVE位，即使沉浸模式在运行时使用“ setImmersive()更改” setImmersive() “ 方法。