StartCropImageView.java

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

public class StartCropImageView extends ImageView {

    Matrix matrix = new Matrix(getImageMatrix());

    public StartCropImageView(Context context) {
        super(context);
        setScaleType(ScaleType.MATRIX);
        setPivotX(0);

    }

    public StartCropImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        setScaleType(ScaleType.MATRIX);
        setPivotX(0);
    }

    public StartCropImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setScaleType(ScaleType.MATRIX);
    }

    @Override
    protected boolean setFrame(int l, int t, int r, int b) {
        matrix.set(getMatrix());
        if (getDrawable() != null) {
            float scale;
            final int viewWidth = getMeasuredWidth() - getPaddingLeft() - getPaddingRight();
            final int viewHeight = getMeasuredHeight() - getPaddingTop() - getPaddingBottom();
            final int drawableWidth = getDrawable().getIntrinsicWidth();
            final int drawableHeight = getDrawable().getIntrinsicHeight();

            if (drawableWidth * viewHeight > drawableHeight * viewWidth) {
                scale = (float) viewHeight / (float) drawableHeight;
            } else {
                scale = (float) viewWidth / (float) drawableWidth;
            }
            if (scale > 0) {
                matrix.setScale(scale, scale);
                setImageMatrix(matrix);
            }
        }
        return super.setFrame(l, t, r, b);

    }


}