java/src/com/android/inputmethod/compat/LooperCompatUtils.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.inputmethod.compat;

import android.os.Looper;

import java.lang.reflect.Method;

/**
 * Helper to call Looper#quitSafely, which was introduced in API
 * level 18 (Build.VERSION_CODES.JELLY_BEAN_MR2).
 *
 * In unit tests, we create lots of instances of LatinIME, which means we need to clean up
 * some Loopers lest we leak file descriptors. In normal use on a device though, this is never
 * necessary (although it does not hurt).
 */
public final class LooperCompatUtils {
    private static final Method METHOD_quitSafely = CompatUtils.getMethod(
            Looper.class, "quitSafely");

    public static void quitSafely(final Looper looper) {
        if (null != METHOD_quitSafely) {
            CompatUtils.invoke(looper, null /* default return value */, METHOD_quitSafely);
        } else {
            looper.quit();
        }
    }
}