Android圆形图片效果 Android实现圆形图片效果
JH学编程 人气:0想了解Android实现圆形图片效果的相关内容吗,JH学编程在本文为您仔细讲解Android圆形图片效果的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:Android,圆形图片,下面大家一起来学习吧。
创建RoundPicture.java文件
在src/main/java/XX包下新建RoundPicture.java
写入RoundPicture.java文件
复制下方代码,并引入类即可
public class RoundPicture extends androidx.appcompat.widget.AppCompatImageView { private Paint paint; public RoundPicture(Context context) { this(context, null); } public RoundPicture(Context context, AttributeSet attrs) { this(context, attrs, 0); } public RoundPicture(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); paint = new Paint(); } // 绘制圆形图片 @Override protected void onDraw(Canvas canvas) { Drawable drawable = getDrawable(); if (null != drawable) { Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap(); Bitmap b = getCircleBitmap(bitmap, 14); final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight()); final Rect rectDest = new Rect(0, 0, getWidth(), getHeight()); paint.reset(); canvas.drawBitmap(b, rectSrc, rectDest, paint); } else { super.onDraw(canvas); } } // 获取圆形图片方法 private Bitmap getCircleBitmap(Bitmap bitmap, int pixels) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xff424242; final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); int x = bitmap.getWidth(); canvas.drawCircle(x / 2, x / 2, x / 2, paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); return output; } }
调用RoundPicture创建圆形图片
只需在.xml文件中插入图片处,将控件名改为
< XX.RoundPicture 并引入图片即可
<com.example.jh_android.RoundPicture android:id="@+id/iv" android:layout_height="200dp" android:layout_width="200dp" android:layout_marginTop="150dp" android:layout_centerHorizontal="true" android:src="@drawable/head" />
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