Android图片圆角
MainActivity.java
package com.xzq.imageviewroundconcer;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ImageView;
/**
* @author XZQ
* @see http://blog.csdn.net/cmdkmd?viewmode=contents
*/
public class MainActivity extends Activity {
private ImageView roundImage;// 需要处理的图片
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findViewById();
processBiz();
}
/**
* 业务的处理
*/
private void processBiz() {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.a);
roundImage.setImageBitmap(getRoundCornerImage(bitmap));
}
/**
* 圆角的处理
*
* @param bitmap
*/
private static Bitmap getRoundCornerImage(Bitmap bitmap) {
Bitmap oldBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);// 创建一个原图
Canvas canvas = new Canvas(oldBitmap);// 创建带有位图roundConcerImage的画布
Paint paint = new Paint();// 创建画笔
Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());// 创建一个和原始图片一样大小的矩形
RectF rectf = new RectF(rect);
paint.setAntiAlias(true);// 去锯齿
canvas.drawRoundRect(rectf, 50, 50, paint);// 画一个和原始图片一样大小的圆角矩形
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); // 设置相交模式
canvas.drawBitmap(bitmap, null, rect, paint); // 把图片画到矩形去
return oldBitmap;
}
/**
* 页面空间初始化
*/
private void findViewById() {
roundImage = (ImageView) findViewById(R.id.img_concer);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}