TopCropImageView

TopCropImageView.java

import android.content.Context;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.widget.ImageView;

public class TopCropImageView extends ImageView {  
	  
    public TopCropImageView(Context context, AttributeSet attrs) {  
            super(context, attrs);  
            setScaleType(ScaleType.MATRIX);  
    }  
     
    public TopCropImageView(Context context, AttributeSet attrs, int defStyle) {  
        super(context, attrs, defStyle);  
        setScaleType(ScaleType.MATRIX);  
    }  
  
    public TopCropImageView(Context context) {  
        super(context);  
        setScaleType(ScaleType.MATRIX);  
    }  
     
    @Override  
    protected boolean setFrame(int l, int t, int r, int b)  
    {  
        if (getDrawable() == null) {  
            return super.setFrame(l, t, r, b);  
        }  
        Matrix matrix = getImageMatrix();  
        float scaleWidth = getWidth()/(float)getDrawable().getIntrinsicWidth();  
        float scaleHeight = getHeight()/(float)getDrawable().getIntrinsicHeight();  
        float scaleFactor = (scaleWidth > scaleHeight) ? scaleWidth : scaleHeight;  
        matrix.setScale(scaleFactor, scaleFactor, 0, 0);  
        if (scaleFactor == scaleHeight) {  
            float tanslateX = ((getDrawable().getIntrinsicWidth() * scaleFactor) - getWidth()) / 2;  
            matrix.postTranslate(-tanslateX, 0);  
        }  
        setImageMatrix(matrix);  
        return super.setFrame(l, t, r, b);  
    }  
}