ImageView自适应大小

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SumeFitImage

public class SumeFitImage extends AppCompatImageView {

    private int width;
    private int height;

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

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

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

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        Drawable drawable = getDrawable();
        if (drawable != null) {
            width = MeasureSpec.getSize(widthMeasureSpec);
            //高度根据使得图片的宽度充满屏幕计算而得
            height = (int) Math.ceil((float) width * (float) drawable.getIntrinsicHeight() / (float) drawable.getIntrinsicWidth());
            setMeasuredDimension(width, height);
        } else {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    public int getH() {
        return height;
    }

    public int getW() {
        return width;
    }