Android开发之自定义圆形的ImageView的实现

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package com.example.tumei.utils;      import android.content.Context;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.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.ImageView;/** * 自定义的圆形ImageView，可以直接当组件在布局中使用。* @author caizhiming* */ public class RoundImageView extends ImageView{ private Paint paint ; public RoundImageView(Context context) { this(context,null);      } public RoundImageView(Context context, AttributeSet attrs){ this(context, attrs,0);      } public RoundImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle);        paint = new Paint();          } /** * 绘制圆形图片    * @author caizhiming */ @Override         protected void onDraw(Canvas canvas) {          Drawable drawable = getDrawable(); if (null != drawable) {             Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();             Bitmap b = getCircleBitmap(bitmap, 14); final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight()); final Rect rectDest = new Rect(0,0,getWidth(),getHeight());           paint.reset();             canvas.drawBitmap(b, rectSrc, rectDest, paint);          } else { super.onDraw(canvas);         }     }             /** * 获取圆形图片方法    * @param bitmap    * @param pixels    * @return Bitmap    * @author caizhiming */     private Bitmap getCircleBitmap(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 Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());         paint.setAntiAlias(true);         canvas.drawARGB(0, 0, 0, 0);         paint.setColor(color); int x = bitmap.getWidth();               canvas.drawCircle(x / 2, x / 2, x / 2, paint);         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));         canvas.drawBitmap(bitmap, rect, rect, paint); return output;                   }  }

 <com.example.tumei.utils.RoundImageView                      android:id="@+id/iv_avatars"                    android:layout_width="35dp"                    android:layout_height="35dp"                    android:gravity="right|center_vertical"                    android:layout_gravity="right|center_vertical"                                        android:src="@drawable/settings_selected"                    android:visibility="visible"            android:clickable="true"                                    android:onClick="onClickAvatars" />

不能设置背景颜色，如果增加这样背景属性，则编程普通imageview。

                    android:background="@color/btn_gray_normal"

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