17 自定义属性及圆角imageView

  1 public class RoundAngleImageView extends ImageView {
  2     //cn.dpocket.moplusand.uinew是app的包名 manifest文件里面
  3     private static final String NAMESPACE = "http://schemas.android.com/apk/res/cn.dpocket.moplusand.uinew";
  4     private Paint paint;
  5     //如果不在xml属性里面设置自定义属性 默认值为5dp
  6     private int roundWidth = 5;
  7     private int roundHeight = 5;
  8     private Paint paint2;
  9     public RoundAngleImageView(Context context) {
 10         super(context);
 11         init(context,null);
 12     }
 13 
 14     public RoundAngleImageView(Context context, AttributeSet attrs) {
 15         super(context, attrs);
 16         init(context,attrs);
 17     }
 18 
 19     private void init(Context context, AttributeSet attrs) {
 20 
 21         if(attrs != null) {
 22             roundWidth= attrs.getAttributeIntValue(NAMESPACE,"roundWidth",0);
 23             roundHeight= attrs.getAttributeIntValue(NAMESPACE, "roundHeight", 0);
 24         }else {
 25             float density = context.getResources().getDisplayMetrics().density;
 26             roundWidth = (int) (roundWidth*density);
 27             roundHeight = (int) (roundHeight*density);
 28         }
 29 
 30         paint = new Paint();
 31         paint.setColor(Color.WHITE);
 32         paint.setAntiAlias(true);
 33         paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
 34 
 35         paint2 = new Paint();
 36         paint2.setXfermode(null);
 37     }
 38 
 39     @Override
 40     public void draw(Canvas canvas) {
 41         Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
 42         Canvas canvas2 = new Canvas(bitmap);
 43         super.draw(canvas2);
 44         drawLiftUp(canvas2);
 45         drawRightUp(canvas2);
 46         drawLiftDown(canvas2);
 47         drawRightDown(canvas2);
 48         canvas.drawBitmap(bitmap, 0, 0, paint2);
 49         bitmap.recycle();
 50     }
 51 
 52     private void drawLiftUp(Canvas canvas) {
 53         Path path = new Path();
 54         path.moveTo(0, roundHeight);
 55         path.lineTo(0, 0);
 56         path.lineTo(roundWidth, 0);
 57         path.arcTo(new RectF(
 58                         0,
 59                         0,
 60                         roundWidth*2,
 61                         roundHeight*2),
 62                 -90,
 63                 -90);
 64         path.close();
 65         canvas.drawPath(path, paint);
 66     }
 67 
 68     private void drawLiftDown(Canvas canvas) {
 69         Path path = new Path();
 70         path.moveTo(0, getHeight()-roundHeight);
 71         path.lineTo(0, getHeight());
 72         path.lineTo(roundWidth, getHeight());
 73         path.arcTo(new RectF(
 74                         0,
 75                         getHeight()-roundHeight*2,
 76                         0+roundWidth*2,
 77                         getHeight()),
 78                 90,
 79                 90);
 80         path.close();
 81         canvas.drawPath(path, paint);
 82     }
 83 
 84     private void drawRightDown(Canvas canvas) {
 85         Path path = new Path();
 86         path.moveTo(getWidth()-roundWidth, getHeight());
 87         path.lineTo(getWidth(), getHeight());
 88         path.lineTo(getWidth(), getHeight()-roundHeight);
 89         path.arcTo(new RectF(
 90                 getWidth()-roundWidth*2,
 91                 getHeight()-roundHeight*2,
 92                 getWidth(),
 93                 getHeight()), 0, 90);
 94         path.close();
 95         canvas.drawPath(path, paint);
 96     }
 97 
 98     private void drawRightUp(Canvas canvas) {
 99         Path path = new Path();
100         path.moveTo(getWidth(), roundHeight);
101         path.lineTo(getWidth(), 0);
102         path.lineTo(getWidth()-roundWidth, 0);
103         path.arcTo(new RectF(
104                         getWidth()-roundWidth*2,
105                         0,
106                         getWidth(),
107                         0+roundHeight*2),
108                 -90,
109                 90);
110         path.close();
111         canvas.drawPath(path, paint);
112     }
113 }

圆角imageView

定义一个attr.xml的文件，放在values目录下面，内容如下：

1 <?xml version="1.0" encoding="utf-8"?>
2 <resources>
3 <declare-styleable name="RoundAngleImageView">
4 <attr name="roundWidth" format="integer" />
5 <attr name="roundHeight" format="integer" />
6 </declare-styleable>
7 </resources>

自定义属性

在布局文件的跟布局中加入如下代码：

//cn.dpocket.moplusand.uinew是app的包名  manifest文件中

xmlns:app="http://schemas.android.com/apk/res/cn.dpocket.moplusand.uinew"

1 <cn.dpocket.moplusand.uinew.widget.RoundAngleImageView
2                         android:id="@+id/iv_head1"
3                         android:layout_width="68dp"
4                         android:layout_height="68dp"    
5                         app:roundWidth="8"
6                         app:roundHeight="8"
7                         ></cn.dpocket.moplusand.uinew.widget.RoundAngleImageView>

自定义view的全路径