transition/api18/android/support/transition/ViewGroupUtilsApi18.java

/*
 * Copyright (C) 2016 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 android.support.transition;

import android.support.annotation.NonNull;
import android.support.annotation.RequiresApi;
import android.util.Log;
import android.view.ViewGroup;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

@RequiresApi(18)
class ViewGroupUtilsApi18 extends ViewGroupUtilsApi14 {

    private static final String TAG = "ViewUtilsApi18";

    private static Method sSuppressLayoutMethod;
    private static boolean sSuppressLayoutMethodFetched;

    @Override
    public ViewGroupOverlayImpl getOverlay(@NonNull ViewGroup group) {
        return new ViewGroupOverlayApi18(group);
    }

    @Override
    public void suppressLayout(@NonNull ViewGroup group, boolean suppress) {
        fetchSuppressLayoutMethod();
        if (sSuppressLayoutMethod != null) {
            try {
                sSuppressLayoutMethod.invoke(group, suppress);
            } catch (IllegalAccessException e) {
                Log.i(TAG, "Failed to invoke suppressLayout method", e);
            } catch (InvocationTargetException e) {
                Log.i(TAG, "Error invoking suppressLayout method", e);
            }
        }
    }

    private void fetchSuppressLayoutMethod() {
        if (!sSuppressLayoutMethodFetched) {
            try {
                sSuppressLayoutMethod = ViewGroup.class.getDeclaredMethod("suppressLayout",
                        boolean.class);
                sSuppressLayoutMethod.setAccessible(true);
            } catch (NoSuchMethodException e) {
                Log.i(TAG, "Failed to retrieve suppressLayout method", e);
            }
            sSuppressLayoutMethodFetched = true;
        }
    }

}