Utils.java

package me.imid.swipebacklayout.lib;

import android.app.Activity;

import java.lang.reflect.Method;

/**
 * Created by Chaojun Wang on 6/9/14.
 */
public class Utils {
    private Utils() {
    }

    /**
     * Convert a translucent themed Activity
     * {@link android.R.attr#windowIsTranslucent} to a fullscreen opaque
     * Activity.
     * <p>
     * Call this whenever the background of a translucent Activity has changed
     * to become opaque. Doing so will allow the {@link android.view.Surface} of
     * the Activity behind to be released.
     * <p>
     * This call has no effect on non-translucent activities or on activities
     * with the {@link android.R.attr#windowIsFloating} attribute.
     */
    public static void convertActivityFromTranslucent(Activity activity) {
        try {
            Method method = Activity.class.getDeclaredMethod("convertFromTranslucent");
            method.setAccessible(true);
            method.invoke(activity);
        } catch (Throwable t) {
        }
    }

    /**
     * Convert a translucent themed Activity
     * {@link android.R.attr#windowIsTranslucent} back from opaque to
     * translucent following a call to
     * {@link #convertActivityFromTranslucent(android.app.Activity)} .
     * <p>
     * Calling this allows the Activity behind this one to be seen again. Once
     * all such Activities have been redrawn
     * <p>
     * This call has no effect on non-translucent activities or on activities
     * with the {@link android.R.attr#windowIsFloating} attribute.
     */
    public static void convertActivityToTranslucent(Activity activity) {
        try {
            Class<?>[] classes = Activity.class.getDeclaredClasses();
            Class<?> translucentConversionListenerClazz = null;
            for (Class clazz : classes) {
                if (clazz.getSimpleName().contains("TranslucentConversionListener")) {
                    translucentConversionListenerClazz = clazz;
                }
            }
            Method method = Activity.class.getDeclaredMethod("convertToTranslucent",
                    translucentConversionListenerClazz);
            method.setAccessible(true);
            method.invoke(activity, new Object[] {
                null
            });
        } catch (Throwable t) {
        }
    }
}