圆形ImageView的实现

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XML直接可以引用

public class CircleImageDrawable extends Drawable {    private Paint mPaint;    private Bitmap mBitmap;    private int mWidth;    public CircleImageDrawable(Bitmap bitmap) {        mBitmap = bitmap;        BitmapShader shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);        mPaint = new Paint();        mPaint.setAntiAlias(true);        mPaint.setShader(shader);        mWidth = Math.min(mBitmap.getWidth(), mBitmap.getHeight());    }    @Override    public void draw(Canvas canvas) {        canvas.drawCircle(mWidth / 2, mWidth / 2, mWidth / 2, mPaint);    }    @Override    public int getIntrinsicWidth() {        return mWidth;    }    @Override    public int getIntrinsicHeight() {        return mWidth;    }    @Override    public void setAlpha(int i) {        mPaint.setAlpha(i);    }    @Override    public void setColorFilter(ColorFilter colorFilter) {        mPaint.setColorFilter(colorFilter);    }    @Override    public int getOpacity() {        return PixelFormat.TRANSLUCENT;    }}

Activity里的引用

public class FirstActivity extends AppCompatActivity {    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_first);        imageBtn = (ImageView) findViewById(R.id.imageBtn);        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.headphoto);        imageBtn.setImageDrawable(new CircleImageDrawable(bitmap));    }}

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