Set round avatar -- canvas and paint

java Code ：

Set related variables ：

private Bitmap bitmap;
private Paint mPaint;
private Path mPath;

 Because it needs to be used clip Series of functions , want  Disable hardware acceleration , Otherwise, it will not produce any effect .

  setLayerType(LAYER_TYPE_SOFTWARE,null);

 Can't be in onDraw Function , You need to initialize .

private void init() {
        setLayerType(LAYER_TYPE_SOFTWARE,null);
        bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.a);
        mPaint = new Paint();
        mPath = new Path();
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        mPath.addCircle(width/2,height/2,width/2,Path.Direction.CCW);
    }

rewrite onDraw() function ：

@Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        canvas.save();
        canvas.clipPath(mPath);
        canvas.drawBitmap(bitmap,0,0,mPaint);
        canvas.restore();
    }

Last but not least xml Just import it into the layout file ：

 <com.example.vacationtest.CircleTest
        android:layout_width="120dp"
        android:layout_height="120dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

The operation effect is as follows ：

                                                                        original image （ You can search Baidu map by yourself ）