Android(安卓)实现图片的圆角

实现圆角的方法，此方法可以将一个位图改变为一个圆角位图：

/** * 获取圆角位图的方法 * @param bitmap 需要转化成圆角的位图 * @param pixels 圆角的度数，数值越大，圆角越大 * @return 处理后的圆角位图 */public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(), Config.ARGB_8888);Canvas canvas = new Canvas(output);final int color = 0xff424242;final Paint paint = new Paint();final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());final RectF rectF = new RectF(rect);final float roundPx = pixels;paint.setAntiAlias(true);canvas.drawARGB(0, 0, 0, 0);paint.setColor(color);canvas.drawRoundRect(rectF, roundPx, roundPx, paint);paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);return output;}

下面就测试一下这个方法，将一个Activity的背景图设置为圆角，即将Activity的LinerLayout的背景设置为圆角：

配置文件 main.xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/layout"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" ></LinearLayout>

Java代码：

import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;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.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.widget.LinearLayout;/** * 将Activity的背景图设置为圆角图 */public class AndroidTestActivity extends Activity {/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);// Drawable drawable = getResources().getDrawable(R.drawable.bg);// BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;// Bitmap bitmap = bitmapDrawable.getBitmap();LinearLayout layout = (LinearLayout) findViewById(R.id.layout);Drawable drawable = getResources().getDrawable(R.drawable.yexuan);BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;Bitmap bitmap = bitmapDrawable.getBitmap();BitmapDrawable bbb = new BitmapDrawable(toRoundCorner(bitmap, 30));layout.setBackgroundDrawable(bbb);// ImageView imageView = (ImageView) findViewById(R.id.imgShow);// imageView.setImageBitmap(MyActivity.getRoundedCornerBitmap(bitmap));// imageView.setImageBitmap(MyActivity.toRoundCorner(bitmap, 20));}/** * 获取圆角位图的方法 * @param bitmap 需要转化成圆角的位图 * @param pixels 圆角的度数，数值越大，圆角越大 * @return 处理后的圆角位图 */public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(), Config.ARGB_8888);Canvas canvas = new Canvas(output);final int color = 0xff424242;final Paint paint = new Paint();final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());final RectF rectF = new RectF(rect);final float roundPx = pixels;paint.setAntiAlias(true);canvas.drawARGB(0, 0, 0, 0);paint.setColor(color);canvas.drawRoundRect(rectF, roundPx, roundPx, paint);paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);return output;}}

效果如下：

嘿嘿，成功了。。。原文： http://www.javaask.com/mobile/android/2011/1013/9118.html

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