RadioImageView.java

/*
 * Copyright 2015 XiNGRZ <chenxingyu92@gmail.com>
 *
 * 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 party.danyang.nationalgeographic.widget;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * 一个能保持比例的 ImageView
 * TODO: 暂时只支持维持宽度适应高度
 *
 * @author XiNGRZ
 */
public class RadioImageView extends ImageView {

    private int originalWidth;
    private int originalHeight;

    public RadioImageView(Context context) {
        super(context);
    }

    public RadioImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public RadioImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public void setOriginalSize(int originalWidth, int originalHeight) {
        this.originalWidth = originalWidth;
        this.originalHeight = originalHeight;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (originalWidth > 0 && originalHeight > 0) {
            float ratio = (float) originalWidth / (float) originalHeight;

            int width = MeasureSpec.getSize(widthMeasureSpec);
            int height = MeasureSpec.getSize(heightMeasureSpec);

            // TODO: 现在只支持固定宽度
            if (width > 0) {
                height = (int) ((float) width / ratio);
            }

            setMeasuredDimension(width, height);
        } else {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    //    @Override
//    protected void onDetachedFromWindow() {
//        super.onDetachedFromWindow();
//        setImageDrawable(null);
//    }

}