Create Rounded Corner ImageView from View to show Image
Description
The following code shows how to Create Rounded Corner ImageView from View to show Image.
Code revised from
Android Recipes:A Problem-Solution Approach
http://www.apress.com/9781430234135
ISBN13: 978-1-4302-3413-5
Example
Main Activity Java code
/*w w w. jav a 2s. c o m*/
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader.TileMode;
import android.util.AttributeSet;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
RoundedCornerImageView iv = new RoundedCornerImageView(this);
Bitmap source = BitmapFactory.decodeResource(getResources(), R.drawable.dog);
iv.setImage(source);
setContentView(iv);
}
}
class RoundedCornerImageView extends View {
private Bitmap mImage;
private Paint mBitmapPaint;
private RectF mBounds;
private float mRadius = 25.0f;
public RoundedCornerImageView(Context context) {
super(context);
init();
}
public RoundedCornerImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public RoundedCornerImageView(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
mBitmapPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mBounds = new RectF();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int height, width;
height = width = 0;
int imageHeight, imageWidth;
if (mImage == null) {
imageHeight = imageWidth = 0;
} else {
imageHeight = mImage.getHeight();
imageWidth = mImage.getWidth();
}
width = getMeasurement(widthMeasureSpec, imageWidth);
height = getMeasurement(heightMeasureSpec, imageHeight);
setMeasuredDimension(width, height);
}
private int getMeasurement(int measureSpec, int contentSize) {
int specSize = MeasureSpec.getSize(measureSpec);
switch (MeasureSpec.getMode(measureSpec)) {
case MeasureSpec.AT_MOST:
return Math.min(specSize, contentSize);
case MeasureSpec.UNSPECIFIED:
return contentSize;
case MeasureSpec.EXACTLY:
return specSize;
default:
return 0;
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
if (w != oldw || h != oldh) {
int imageWidth, imageHeight;
if (mImage == null) {
imageWidth = imageHeight = 0;
} else {
imageWidth = mImage.getWidth();
imageHeight = mImage.getHeight();
}
int left = (w - imageWidth) / 2;
int top = (h - imageHeight) / 2;
mBounds.set(left, top, left+imageWidth, top+imageHeight);
if (mBitmapPaint.getShader() != null) {
Matrix m = new Matrix();
m.setTranslate(left, top);
mBitmapPaint.getShader().setLocalMatrix(m);
}
}
}
public void setImage(Bitmap bitmap) {
if (mImage != bitmap) {
mImage = bitmap;
if (mImage != null) {
BitmapShader shader = new BitmapShader(mImage, TileMode.CLAMP, TileMode.CLAMP);
mBitmapPaint.setShader(shader);
} else {
mBitmapPaint.setShader(null);
}
requestLayout();
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mBitmapPaint != null) {
canvas.drawRoundRect(mBounds, mRadius, mRadius, mBitmapPaint);
}
}
}