android activity 全屏非全屏切换

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android app 通过代码，在全屏和非全屏之间切换

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Build;
import android.view.WindowManager;

public class FullScreenOperator {
private static boolean sIsFullScreen = false;
private static int sOrientation = 0;
private static int sSystemUiVisibility = 0;
private static int sEnterCount = 0;

private static boolean isFullScreen(Activity activity) {
return WindowManager.LayoutParams.FLAG_FULLSCREEN
== (activity.getWindow().getAttributes().flags
& WindowManager.LayoutParams.FLAG_FULLSCREEN);
}

public static void enter(Activity activity) {
++sEnterCount;

//Log.v(TAG, "enter " + sEnterCount + ", activity " + activity);

if (activity == null || sEnterCount != 1)
return;

sIsFullScreen = isFullScreen(activity);
sOrientation = activity.getRequestedOrientation();

if (Build.VERSION.SDK_INT >= 14) {
sSystemUiVisibility = activity.getWindow().getDecorView().getSystemUiVisibility();
}

if (!sIsFullScreen) {
activity.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
}

activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);

if (Build.VERSION.SDK_INT >= 16) {
// View.SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004
activity.getWindow().getDecorView().setSystemUiVisibility(0x00000004);
}
}

public static void exit(Activity activity) {
--sEnterCount;

//Log.v(TAG, "exit " + sEnterCount + ", activity " + activity);

if (activity == null || sEnterCount != 0)
return;

if (!sIsFullScreen)
activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

activity.setRequestedOrientation(sOrientation);

if (Build.VERSION.SDK_INT >= 14) {
activity.getWindow().getDecorView().setSystemUiVisibility(sSystemUiVisibility);
}
}
}