Android 自定义圆角ImageView，androidimageview

Android 自定义圆角ImageView，androidimageview

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[java] view plaincopy

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[java] view plaincopy

1. java类如下：  

[java] view plaincopy

1.   

[java] view plaincopy

1. import android.content.Context;  
2. import android.content.res.TypedArray;  
3. import android.graphics.Bitmap;  
4. import android.graphics.Bitmap.Config;  
5. import android.graphics.Canvas;  
6. import android.graphics.Color;  
7. import android.graphics.Paint;  
8. import android.graphics.Path;  
9. import android.graphics.PorterDuff;  
10. import android.graphics.PorterDuffXfermode;  
11. import android.graphics.RectF;  
12. import android.util.AttributeSet;  
13. import android.widget.ImageView;  
14. import cn.dotcreate.tt.R;  
15.   
16. public class RoundAngleImageView extends ImageView {  
17.   
18.     private Paint paint;  
19.     private int roundWidth = 5;  
20.     private int roundHeight = 5;  
21.     private Paint paint2;  
22.   
23.     public RoundAngleImageView(Context context, AttributeSet attrs, int defStyle) {  
24.         super(context, attrs, defStyle);  
25.         init(context, attrs);  
26.     }  
27.   
28.     public RoundAngleImageView(Context context, AttributeSet attrs) {  
29.         super(context, attrs);  
30.         init(context, attrs);  
31.     }  
32.   
33.     public RoundAngleImageView(Context context) {  
34.         super(context);  
35.         init(context, null);  
36.     }  
37.       
38.     private void init(Context context, AttributeSet attrs) {  
39.           
40.         if(attrs != null) {     
41.             TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundAngleImageView);   
42.             roundWidth= a.getDimensionPixelSize(R.styleable.RoundAngleImageView_roundWidth, roundWidth);  
43.             roundHeight= a.getDimensionPixelSize(R.styleable.RoundAngleImageView_roundHeight, roundHeight);  
44.         }else {  
45.             float density = context.getResources().getDisplayMetrics().density;  
46.             roundWidth = (int) (roundWidth*density);  
47.             roundHeight = (int) (roundHeight*density);  
48.         }   
49.           
50.         paint = new Paint();  
51.         paint.setColor(Color.WHITE);  
52.         paint.setAntiAlias(true);  
53.         paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));  
54.           
55.         paint2 = new Paint();  
56.         paint2.setXfermode(null);  
57.     }  
58.       
59.     @Override  
60.     public void draw(Canvas canvas) {  
61.         Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Config.ARGB_8888);  
62.         Canvas canvas2 = new Canvas(bitmap);  
63.         super.draw(canvas2);  
64.         drawLiftUp(canvas2);  
65.         drawRightUp(canvas2);  
66.         drawLiftDown(canvas2);  
67.         drawRightDown(canvas2);  
68.         canvas.drawBitmap(bitmap, 0, 0, paint2);  
69.         bitmap.recycle();  
70.     }  
71.       
72.     private void drawLiftUp(Canvas canvas) {  
73.         Path path = new Path();  
74.         path.moveTo(0, roundHeight);  
75.         path.lineTo(0, 0);  
76.         path.lineTo(roundWidth, 0);  
77.         path.arcTo(new RectF(  
78.                 0,   
79.                 0,   
80.                 roundWidth*2,   
81.                 roundHeight*2),   
82.                 -90,   
83.                 -90);  
84.         path.close();  
85.         canvas.drawPath(path, paint);  
86.     }  
87.       
88.     private void drawLiftDown(Canvas canvas) {  
89.         Path path = new Path();  
90.         path.moveTo(0, getHeight()-roundHeight);  
91.         path.lineTo(0, getHeight());  
92.         path.lineTo(roundWidth, getHeight());  
93.         path.arcTo(new RectF(  
94.                 0,   
95.                 getHeight()-roundHeight*2,   
96.                 0+roundWidth*2,   
97.                 getHeight()),  
98.                 90,   
99.                 90);  
100.         path.close();  
101.         canvas.drawPath(path, paint);  
102.     }  
103.       
104.     private void drawRightDown(Canvas canvas) {  
105.         Path path = new Path();  
106.         path.moveTo(getWidth()-roundWidth, getHeight());  
107.         path.lineTo(getWidth(), getHeight());  
108.         path.lineTo(getWidth(), getHeight()-roundHeight);  
109.         path.arcTo(new RectF(  
110.                 getWidth()-roundWidth*2,   
111.                 getHeight()-roundHeight*2,   
112.                 getWidth(),   
113.                 getHeight()), 0, 90);  
114.         path.close();  
115.         canvas.drawPath(path, paint);  
116.     }  
117.       
118.     private void drawRightUp(Canvas canvas) {  
119.         Path path = new Path();  
120.         path.moveTo(getWidth(), roundHeight);  
121.         path.lineTo(getWidth(), 0);  
122.         path.lineTo(getWidth()-roundWidth, 0);  
123.         path.arcTo(new RectF(  
124.                 getWidth()-roundWidth*2,   
125.                 0,   
126.                 getWidth(),   
127.                 0+roundHeight*2),   
128.                 -90,   
129.                 90);  
130.         path.close();  
131.         canvas.drawPath(path, paint);  
132.     }  
133.   
134. }  

定义一个attr.xml的文件，放在values目录下面，内容如下：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="RoundAngleImageView">
<attr name="roundWidth" format="dimension" />
<attr name="roundHeight" format="dimension" />
</declare-styleable>
</resources>
使用示例如下：
先要声明属性的名字空间：
然后再写跟一般定义View一样： <cn.dotcreate.tt.ui.RoundAngleImageView
android:id="@+id/headIV"
android:layout_width="75dp"
android:layout_height="75dp"
android:layout_centerVertical="true"
android:layout_marginLeft="2dp"
app:roundWidth="10dp"
app:roundHeight="10dp"
android:src="@drawable/default_head_icon" />


效果如图：