Question

我有一个固定的尺寸ImageView。我想实现这个目标：

如果Bitmap宽于或小于Bitmap宽度，则Imageview始终缩放到宽度。
如果高度高于ImageView高度，则裁剪高度，否则将其缩放到高度。

我想要这样的answer，但反过来（FitXCropY）。我试过改变这个答案没有成功。

谢谢。

Answer 1

根据这个答案ImageView to scale to fixed height, but crop excess width

public class FitXCropYImageView extends ImageView {
boolean done = false;

@SuppressWarnings("UnusedDeclaration")
public FitXCropYImageView(Context context) {
    super(context);
    setScaleType(ScaleType.MATRIX);
}

@SuppressWarnings("UnusedDeclaration")
public FitYCropXImageView(Context context, AttributeSet attrs) {
    super(context, attrs);
    setScaleType(ScaleType.MATRIX);
}

@SuppressWarnings("UnusedDeclaration")
public FitXCropYImageView(Context context, AttributeSet attrs, int defStyle)      {
    super(context, attrs, defStyle);
    setScaleType(ScaleType.MATRIX);
}

private final RectF drawableRect = new RectF(0, 0, 0,0);
private final RectF viewRect = new RectF(0, 0, 0,0);
private final Matrix m = new Matrix();
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    if (done) {
        return;//Already fixed drawable scale
    }
    final Drawable d = getDrawable();
    if (d == null) {
        return;//No drawable to correct for
    }
    int viewHeight = getMeasuredHeight();
    int viewWidth = getMeasuredWidth();
    int drawableWidth = d.getIntrinsicWidth();
    int drawableHeight = d.getIntrinsicHeight();
    drawableRect.set(0, 0, drawableWidth, drawableHeight);//Represents the original image
    //Compute the left and right bounds for the scaled image
    float viewHalfHeight = viewHeight / 2;
    float scale = (float) viewWidth / (float) drawableWidth;
    float scaledHeight = drawableHeight * scale;
    float scaledHalfHeight = scaledHeight / 2;
    viewRect.set(0, viewHalfHeight-scaledHalfHeight,viewWidth, viewHalfHeight+scaledHalfHeight);

    m.setRectToRect(drawableRect, viewRect, Matrix.ScaleToFit.CENTER /* This constant doesn't matter? */);
    setImageMatrix(m);

    done = true;

    requestLayout();
}
}

Answer 2

试试这个，

在Oncreate中添加

viewImage = (ImageView) findViewById(R.id.pictureImageview123);
viewImage.setScaleType(ScaleType.FIT_XY);

Android ImageView将位图缩放到宽度并裁剪高度

2 个答案: