开源项目：RoundedImageView

1 <org.warnier.zhang.widget.RoundedImageView 
2     xmlns:android="http://schemas.android.com/apk/res/android"
3     xmlns:app="http://schemas.android.com/apk/res-auto"
4     android:layout_width="wrap_content"
5     android:layout_height="wrap_content"
6     android:scaleType="fitXY"
7     app:circular="true"
8     app:src="@drawable/logo" />

1 <org.warnier.zhang.nongji.widget.RoundedImageView
2     xmlns:android="http://schemas.android.com/apk/res/android"
3     xmlns:app="http://schemas.android.com/apk/res-auto"
4     android:layout_width="wrap_content"
5     android:layout_height="wrap_content"
6     android:scaleType="fitXY"
7     app:cornerRadius="8dp"
8     app:src="@drawable/logo" />

 1 package org.warnier.zhang.widget;
 2 
 3 import android.content.Context;
 4 import android.content.res.TypedArray;
 5 import android.graphics.Bitmap;
 6 import android.graphics.BitmapFactory;
 7 import android.graphics.drawable.Drawable;
 8 import android.support.v4.graphics.drawable.RoundedBitmapDrawable;
 9 import android.support.v4.graphics.drawable.RoundedBitmapDrawableFactory;
10 import android.util.AttributeSet;
11 import android.widget.ImageView;
12 
13 import org.warnier.zhang.nongji.R;
14 
15 public class RoundedImageView extends ImageView {
16     private int mCornerRadius = 0;
17     private boolean mCircular = false;
18     private int mResource = 0;
19 
20     public RoundedImageView(Context context) {
21         this(context, null);
22     }
23 
24     public RoundedImageView(Context context, AttributeSet attrs) {
25         this(context, attrs, 0);
26     }
27 
28     public RoundedImageView(Context context, AttributeSet attrs, int defStyleAttr) {
29         super(context, attrs, defStyleAttr);
30         TypedArray typedArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.RoundedImageView, 0, 0);
31         try {
32             mCornerRadius = typedArray.getDimensionPixelSize(R.styleable.RoundedImageView_cornerRadius, 0);
33             mCircular = typedArray.getBoolean(R.styleable.RoundedImageView_circular, false);
34             mResource = typedArray.getResourceId(R.styleable.RoundedImageView_src, 0);
35             if (mResource != 0) {
36                 setImageResource(mResource);
37             }
38         } finally {
39             typedArray.recycle();
40         }
41     }
42 
43     @Override
44     public void setImageResource(int resId) {
45         super.setImageResource(resId);
46         Bitmap bitmap = BitmapFactory.decodeResource(getResources(), resId);
47         setImageBitmap(bitmap);
48     }
49 
50     @Override
51     public void setImageBitmap(Bitmap bitmap) {
52         super.setImageBitmap(bitmap);
53         setImageDrawable(round(bitmap));
54     }
55 
56     private Drawable round(Bitmap bitmap) {
57         RoundedBitmapDrawable drawable = RoundedBitmapDrawableFactory.create(getResources(), bitmap);
58         drawable.setAntiAlias(true);
59         if (mCircular) {
60             drawable.setCircular(true);
61         }
62         if (mCornerRadius != 0) {
63             drawable.setCornerRadius(mCornerRadius);
64         }
65         return drawable;
66     }
67 
68     public void setCornerRadius(int cornerRadius) {
69         mCornerRadius = cornerRadius;
70     }
71 
72     public void setCircular(boolean circular) {
73         mCircular = circular;
74     }
75 
76     public int getCornerRadius() {
77         return mCornerRadius;
78     }
79 
80     public boolean isCircular() {
81         return mCircular;
82     }
83 }