FrameLayoutCompatUtils.java

/*
 * Copyright (C) 2011 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.view.ViewGroup;
import android.view.ViewGroup.MarginLayoutParams;
import android.widget.FrameLayout;
import android.widget.RelativeLayout;

public class FrameLayoutCompatUtils {
    private static final boolean NEEDS_FRAME_LAYOUT_HACK = (
            android.os.Build.VERSION.SDK_INT < 11 /* Honeycomb */);

    public static ViewGroup getPlacer(ViewGroup container) {
        if (NEEDS_FRAME_LAYOUT_HACK) {
            // Insert RelativeLayout to be able to setMargin because pre-Honeycomb FrameLayout
            // could not handle setMargin properly.
            final ViewGroup placer = new RelativeLayout(container.getContext());
            container.addView(placer);
            return placer;
        } else {
            return container;
        }
    }

    public static MarginLayoutParams newLayoutParam(ViewGroup placer, int width, int height) {
        if (placer instanceof FrameLayout) {
            return new FrameLayout.LayoutParams(width, height);
        } else if (placer instanceof RelativeLayout) {
            return new RelativeLayout.LayoutParams(width, height);
        } else if (placer == null) {
            throw new NullPointerException("placer is null");
        } else {
            throw new IllegalArgumentException("placer is neither FrameLayout nor RelativeLayout: "
                    + placer.getClass().getName());
        }
    }
}