自定义View之绘制圆形控件

1. 创建一个类继承自View

 1 package com.bwf.view_05;
 2 
 3 import android.content.Context;
 4 
 5 import android.graphics.Bitmap;
 6 import android.graphics.Bitmap.Config;
 7 import android.graphics.Canvas;
 8 import android.graphics.Color;
 9 import android.graphics.Paint;
10 import android.graphics.PorterDuff.Mode;
11 import android.graphics.PorterDuffXfermode;
12 import android.graphics.Rect;
13 import android.graphics.drawable.BitmapDrawable;
14 import android.graphics.drawable.Drawable;
15 import android.util.AttributeSet;
16 import android.widget.ImageView;
17 
18 public class MyCircleImageView extends ImageView {
19 
20     public MyCircleImageView(Context context) {
21         super(context);
22         // TODO Auto-generated constructor stub
23     }
24 
25     public MyCircleImageView(Context context, AttributeSet attrs) {
26         super(context, attrs);
27     }
28 
29     public MyCircleImageView(Context context, AttributeSet attrs, int defStyle) {
30         super(context, attrs, defStyle);
31     }
32 
33     @Override
34     protected void onDraw(Canvas canvas) {
35 
36         Drawable drawable = getDrawable();
37 
38         if (drawable == null) {
39             return;
40         }
41 
42         if (getWidth() == 0 || getHeight() == 0) {
43             return;
44         }
45 
46         Bitmap b = ((BitmapDrawable) drawable).getBitmap();
47 
48         if (null == b) {
49             return;
50         }
51 
52         Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
53 
54         int w = getWidth(), h = getHeight();
55 
56         Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
57         canvas.drawBitmap(roundBitmap, 0, 0, null);
58 
59     }
60 
61     public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
62         Bitmap sbmp;
63         if (bmp.getWidth() != radius || bmp.getHeight() != radius)
64             sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);
65         else
66             sbmp = bmp;
67         Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), sbmp.getHeight(),
68                 Config.ARGB_8888);
69         Canvas canvas = new Canvas(output);
70 
71         final int color = 0xffa19774;
72         final Paint paint = new Paint();
73         final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());
74 
75         paint.setAntiAlias(true);
76         paint.setFilterBitmap(true);
77         paint.setDither(true);
78         canvas.drawARGB(0, 0, 0, 0);
79         paint.setColor(Color.parseColor("#BAB399"));
80         canvas.drawCircle(sbmp.getWidth() / 2 + 0.7f,
81                 sbmp.getHeight() / 2 + 0.7f, sbmp.getWidth() / 2 + 0.1f, paint);
82         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
83         canvas.drawBitmap(sbmp, rect, rect, paint);
84 
85         return output;
86     }
87 
88 }

2.布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.bwf.view_05.MyCircleImageView
        android:id="@+id/iv"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_centerInParent="true"
        android:src="@drawable/ldh" />

</RelativeLayout>

3.activity

 1 package com.bwf.view_05;
 2 
 3 import android.os.Bundle;
 4 import android.app.Activity;
 5 import android.view.Menu;
 6 
 7 public class MainActivity extends Activity {
 8 
 9     @Override
10     protected void onCreate(Bundle savedInstanceState) {
11         super.onCreate(savedInstanceState);
12         setContentView(R.layout.activity_main);
13     }
14 
15     @Override
16     public boolean onCreateOptionsMenu(Menu menu) {
17         // Inflate the menu; this adds items to the action bar if it is present.
18         getMenuInflater().inflate(R.menu.main, menu);
19         return true;
20     }
21 
22 }

posted on 2015-11-11 21:13 敬的男人阅读(263) 评论(0) 收藏举报