Android ImageView Drawable Get amendMatrixForCenterCrop(ImageView imageView)

Description

amend Matrix For Center Crop

Declaration

public static void amendMatrixForCenterCrop(ImageView imageView) 

Method Source Code

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Locale;
import android.annotation.SuppressLint;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.text.TextUtils;
import android.widget.ImageView;

public class Main{
    /**/* w  w w .ja va2  s  .co  m*/
     * bitmap with alpha channel
     */
    public static final String LOG_TAG = "BitmapUtils";
    public static void amendMatrixForCenterCrop(ImageView imageView) {
        if (imageView == null) {
            return;
        }

        Drawable drawable = imageView.getDrawable();
        int drawableHeight = drawable != null ? drawable
                .getIntrinsicHeight() : 0;
        int drawableWidth = drawable != null ? drawable.getIntrinsicWidth()
                : 0;
        int viewWidth = imageView.getWidth();
        int viewHeight = imageView.getHeight();
        if (drawableHeight <= 0 || drawableWidth <= 0 || viewWidth <= 0
                || viewHeight <= 0) {
            return;
        }
        float horizontalScaleRatio = 1.0f * viewWidth / drawableWidth;
        float verticalScaleRatio = 1.0f * viewHeight / drawableHeight;
        if (verticalScaleRatio >= horizontalScaleRatio) {
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        } else {
            imageView.setScaleType(ImageView.ScaleType.MATRIX);
            float scaleRatio = Math.max(horizontalScaleRatio,
                    verticalScaleRatio);
            Matrix matrix = new Matrix();
            matrix.postScale(scaleRatio, scaleRatio);
            imageView.setImageMatrix(matrix);
        }
    }
}