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Android自定义圆角ImageView

2019年07月24日  | 移动技术网IT编程  | 我要评论

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废话不多说了，直接给大家贴代码了。

java类如下： 

import android.content.context; 
import android.content.res.typedarray; 
import android.graphics.bitmap; 
import android.graphics.bitmap.config; 
import android.graphics.canvas; 
import android.graphics.color; 
import android.graphics.paint; 
import android.graphics.path; 
import android.graphics.porterduff; 
import android.graphics.porterduffxfermode; 
import android.graphics.rectf; 
import android.util.attributeset; 
import android.widget.imageview; 
import cn.dotcreate.tt.r; 
public class roundangleimageview extends imageview { 
private paint paint; 
private int roundwidth = 5; 
private int roundheight = 5; 
private paint paint2; 
public roundangleimageview(context context, attributeset attrs, int defstyle) { 
super(context, attrs, defstyle); 
init(context, attrs); 
} 
public roundangleimageview(context context, attributeset attrs) { 
super(context, attrs); 
init(context, attrs); 
} 
public roundangleimageview(context context) { 
super(context); 
init(context, null); 
} 
private void init(context context, attributeset attrs) { 
if(attrs != null) { 
typedarray a = context.obtainstyledattributes(attrs, r.styleable.roundangleimageview); 
roundwidth= a.getdimensionpixelsize(r.styleable.roundangleimageview_roundwidth, roundwidth); 
roundheight= a.getdimensionpixelsize(r.styleable.roundangleimageview_roundheight, roundheight); 
}else { 
float density = context.getresources().getdisplaymetrics().density; 
roundwidth = (int) (roundwidth*density); 
roundheight = (int) (roundheight*density); 
} 
paint = new paint(); 
paint.setcolor(color.white); 
paint.setantialias(true); 
paint.setxfermode(new porterduffxfermode(porterduff.mode.dst_out)); 
paint2 = new paint(); 
paint2.setxfermode(null); 
} 
@override 
public void draw(canvas canvas) { 
bitmap bitmap = bitmap.createbitmap(getwidth(), getheight(), config.argb_8888); 
canvas canvas2 = new canvas(bitmap); 
super.draw(canvas2); 
drawliftup(canvas2); 
drawrightup(canvas2); 
drawliftdown(canvas2); 
drawrightdown(canvas2); 
canvas.drawbitmap(bitmap, 0, 0, paint2); 
bitmap.recycle(); 
} 
private void drawliftup(canvas canvas) { 
path path = new path(); 
path.moveto(0, roundheight); 
path.lineto(0, 0); 
path.lineto(roundwidth, 0); 
path.arcto(new rectf( 
0, 
0, 
roundwidth*2, 
roundheight*2), 
-90, 
-90); 
path.close(); 
canvas.drawpath(path, paint); 
} 
private void drawliftdown(canvas canvas) { 
path path = new path(); 
path.moveto(0, getheight()-roundheight); 
path.lineto(0, getheight()); 
path.lineto(roundwidth, getheight()); 
path.arcto(new rectf( 
0, 
getheight()-roundheight*2, 
0+roundwidth*2, 
getheight()), 
90, 
90); 
path.close(); 
canvas.drawpath(path, paint); 
} 
private void drawrightdown(canvas canvas) { 
path path = new path(); 
path.moveto(getwidth()-roundwidth, getheight()); 
path.lineto(getwidth(), getheight()); 
path.lineto(getwidth(), getheight()-roundheight); 
path.arcto(new rectf( 
getwidth()-roundwidth*2, 
getheight()-roundheight*2, 
getwidth(), 
getheight()), 0, 90); 
path.close(); 
canvas.drawpath(path, paint); 
} 
private void drawrightup(canvas canvas) { 
path path = new path(); 
path.moveto(getwidth(), roundheight); 
path.lineto(getwidth(), 0); 
path.lineto(getwidth()-roundwidth, 0); 
path.arcto(new rectf( 
getwidth()-roundwidth*2, 
0, 
getwidth(), 
0+roundheight*2), 
-90, 
90); 
path.close(); 
canvas.drawpath(path, paint); 
} 
}

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：

以上代码简单介绍了android自定义圆角imageview的相关知识，希望本文分享对大家有所帮助。

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