Android 圓角圖片

1.繼承ImageView方式實現圓角圖片

使用：

RoundImageView imageView = (RoundImageView) mView.findViewById(R.id.img_icon);
imageView.setRect_adius(300);

佈局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="@dimen/lyrics_height"
    android:layout_marginLeft="@dimen/bottom_btn_height"
    android:layout_marginRight="@dimen/bottom_btn_height"
    android:background="@color/gainsboro"
    android:orientation="horizontal" >

    <包名.RoundImageView
        android:id="@+id/img_icon"
        style="@style/RoundImageView"
        android:scaleType="fitXY"
        android:src="@drawable/icon_test"
        imagecontrol:border_inside_color="@color/themewhite"
        imagecontrol:border_thickness="1dp" />
</LinearLayout>

attr.xml中添加

<declare-styleable name="roundedimageview">
        <attr name="border_thickness" format="dimension" />
        <attr name="border_inside_color" format="color" />
<attr name="border_outside_color" format="color"></attr>
</declare-styleable>

RoundImageView.java

public class RoundImageView extends ImageView{
    public RoundImageView(Context context) {
        this(context,null);
    }

    public RoundImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

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

    private final RectF roundRect = new RectF();

    public void setRect_adius(float rect_adius) {
        this.rect_adius = rect_adius;
    }

    private float rect_adius = 6;
    private final Paint maskPaint = new Paint();
    private final Paint zonePaint = new Paint();

    private void init() {
        maskPaint.setAntiAlias(true);
        maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        //
        zonePaint.setAntiAlias(true);
        zonePaint.setColor(Color.WHITE);
        //
        float density = getResources().getDisplayMetrics().density;
        rect_adius = rect_adius * density;
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        int w = getWidth();
        int h = getHeight();
        roundRect.set(0, 0, w, h);
    }

    @Override
    public void draw(Canvas canvas) {
        canvas.saveLayer(roundRect, zonePaint, Canvas.ALL_SAVE_FLAG);
        canvas.drawRoundRect(roundRect, rect_adius, rect_adius, zonePaint);
        canvas.saveLayer(roundRect, maskPaint, Canvas.ALL_SAVE_FLAG);
        super.draw(canvas);
        canvas.restore();
    }
}