你可以通过在manifest.xml文件中这样写来强制你的特定活动始终保持纵向模式:

<activity
    android:name=".MainActivity"
    android:screenOrientation="portrait"></activity>

你也可以通过在你的活动的onCreate()方法中写入下面的行来强制你的活动保持在纵向模式:

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_layout);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}

<android . . . >
    . . .
    <manifest . . . >
        . . .
        <application>
            <activity
                android:name=".MyActivity"
                android:screenOrientation="portrait"
                android:configChanges="keyboardHidden|orientation">
            </activity>
        </application>
    </manifest>
</android>

在Activity的onCreate()中使用

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

如果您正在使用Xamarin c#，其中一些解决方案将无法工作。这是我发现的一个有效的解决方案。

[Activity(MainLauncher = true, Icon = "@drawable/icon", ScreenOrientation = ScreenOrientation.Portrait)]

上面的类工作得很好，类似于其他解决方案。此外，它不是全局适用的，需要放在每个活动头中。

您可以为整个应用程序这样做，而不必使所有活动扩展一个公共基类。

诀窍是首先确保在项目中包含Application子类。在它的onCreate()中，当你的应用程序第一次启动时调用，你注册了一个ActivityLifecycleCallbacks对象(API级别14+)来接收活动生命周期事件的通知。

这让你有机会在应用程序中的任何活动启动(或停止，或恢复，或其他)时执行自己的代码。此时，您可以在新创建的活动上调用setRequestedOrientation()。

不要忘记添加app:name="。MyApp”。

class MyApp extends Application {

    @Override
    public void onCreate() {
        super.onCreate();  

        // register to be informed of activities starting up
        registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {

            @Override
            public void onActivityCreated(Activity activity, 
                                          Bundle savedInstanceState) {

                // new activity created; force its orientation to portrait
                activity.setRequestedOrientation(
                    ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            }
            ....
        });
    }
}

如何在一些视图中改变方向

不是锁定整个活动的方向，你可以使用这个类从你的任何视图中动态地锁定方向:

让你的视图成为景观

OrientationUtils.lockOrientationLandscape(mActivity);

将视图设置为竖屏

OrientationUtils.lockOrientationPortrait(mActivity);

解锁取向

OrientationUtils.unlockOrientation(mActivity);

方向Util类

import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.os.Build;
import android.view.Surface;
import android.view.WindowManager;

/*  * This class is used to lock orientation of android app in nay android devices
 */

public class OrientationUtils {
    private OrientationUtils() {
    }

    /** Locks the device window in landscape mode. */
    public static void lockOrientationLandscape(Activity activity) {
        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
    }

    /** Locks the device window in portrait mode. */
    public static void lockOrientationPortrait(Activity activity) {
        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }

    /** Locks the device window in actual screen mode. */
    public static void lockOrientation(Activity activity) {
        final int orientation = activity.getResources().getConfiguration().orientation;
        final int rotation = ((WindowManager) activity.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay()
                .getRotation();

        // Copied from Android docs, since we don't have these values in Froyo
        // 2.2
        int SCREEN_ORIENTATION_REVERSE_LANDSCAPE = 8;
        int SCREEN_ORIENTATION_REVERSE_PORTRAIT = 9;

        // Build.VERSION.SDK_INT <= Build.VERSION_CODES.FROYO
        if (!(Build.VERSION.SDK_INT <= Build.VERSION_CODES.FROYO)) {
            SCREEN_ORIENTATION_REVERSE_LANDSCAPE = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
            SCREEN_ORIENTATION_REVERSE_PORTRAIT = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
        }

        if (rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_90) {
            if (orientation == Configuration.ORIENTATION_PORTRAIT) {
                activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            } else if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
                activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            }
        } else if (rotation == Surface.ROTATION_180 || rotation == Surface.ROTATION_270) {
            if (orientation == Configuration.ORIENTATION_PORTRAIT) {
                activity.setRequestedOrientation(SCREEN_ORIENTATION_REVERSE_PORTRAIT);
            } else if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
                activity.setRequestedOrientation(SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
            }
        }
    }

    /** Unlocks the device window in user defined screen mode. */
    public static void unlockOrientation(Activity activity) {
        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER);
    }

}