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mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setColor(Color.BLACK);
mPaint.setTextSize(60);

canvas.translate(300, 300);
canvas.clipRect(100, 100, 300, 300); // Set display range
canvas.drawColor(Color.WHITE); // White background
canvas.drawText("Double 11, keep eating my dog food...", 150, 300, mPaint); // Draw string

/**
 * Created by coder-pig on 2015/7/18 0018.
 */
public class RoundImageView extends ImageView {

    private Bitmap mBitmap;
    private Rect mRect = new Rect();
    private PaintFlagsDrawFilter pdf = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG);
    private Paint mPaint = new Paint();
    private Path mPath = new Path();

    public RoundImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    // Pass in a Bitmap object
    public void setBitmap(Bitmap bitmap) {
        this.mBitmap = bitmap;
    }

    private void init() {
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        mPaint.setAntiAlias(true); // Anti-aliasing
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (mBitmap == null) {
            return;
        }
        mRect.set(0, 0, getWidth(), getHeight());
        canvas.save();
        canvas.setDrawFilter(pdf);
        mPath.addCircle(getWidth() / 2, getWidth() / 2, getHeight() / 2, Path.Direction.CCW);
        canvas.clipPath(mPath, Region.Op.REPLACE);
        canvas.drawBitmap(mBitmap, null, mRect, mPaint);
        canvas.restore();
    }
}

<com.jay.demo.imageviewdemo.RoundImageView
        android:id="@+id/img_round"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_margin="5px"/>

public class MainActivity extends AppCompatActivity {

    private RoundImageView img_round;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        img_round = (RoundImageView) findViewById(R.id.img_round);
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.meinv);
        img_round.setBitmap(bitmap);
    }
}