Android 实现切圆图作为头像使用实例
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2024-02-23 10:59:28
android 切圆图
效果图如下:
myview 类
public class myview extends view {
bitmap bm...
android 切圆图
效果图如下:
myview 类
public class myview extends view { bitmap bmp; paint paint = new paint(); public myview(context context) { super(context); } public myview(context context, attributeset attrs) { super(context, attrs); bmp = bitmapfactory.decoderesource(getresources(), r.mipmap.c); src = new rectf(bmp.getwidth() / 2 - 50, bmp.getheight() / 2 - 50, bmp.getwidth() / 2 + 50, bmp.getheight() / 2 + 50); dst = new rect(200, 200, 400, 400); paint.setantialias(true); paint.setdither(true); shader shaer = new bitmapshader(bmp, shader.tilemode.mirror, shader.tilemode.repeat); paint.setshader(shaer); } private rectf src = null; private rect dst = null; @override protected void ondraw(canvas canvas) { super.ondraw(canvas); //绘制bitmap matrix m = new matrix(); //每次set都会重置矩形 m.setrotate(90, bmp.getwidth() / 2, bmp.getheight() / 2); m.posttranslate(100, 100); m.prescale(0.5f, 0.5f, bmp.getwidth() / 2, bmp.getheight() / 2); //错切 m.postskew(0.3f, 0.3f); // canvas.drawbitmap(bmp, m, null); // canvas.drawbitmap(bmp, src, dst, null); //拿view的高宽 canvas.drawarc(src, 100, 270, true, paint); } }
mainactivity 类
public class mainactivity extends appcompatactivity { @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); } }
xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.example.administrator.lesson12_drawbitmap.mainactivity"> <com.example.administrator.lesson12_drawbitmap.myview android:layout_width="wrap_content" android:layout_height="wrap_content" /> </linearlayout>
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