android自定义一圆角ImageView

[java] view plaincopy

[java]
java类如下：
[java]

[java]
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.widget.ImageView;
import cn.dotcreate.tt.R;

public class RoundAngleImageView extends ImageView {

    private Paint paint;
    private int roundWidth = 5;
    private int roundHeight = 5;
    private Paint paint2;

    public RoundAngleImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context, attrs);
    }

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

    public RoundAngleImageView(Context context) {
        super(context);
        init(context, null);
    }

    private void init(Context context, AttributeSet attrs) {

        if(attrs != null) {
            TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundAngleImageView);
            roundWidth= a.getDimensionPixelSize(R.styleable.RoundAngleImageView_roundWidth, roundWidth);
            roundHeight= a.getDimensionPixelSize(R.styleable.RoundAngleImageView_roundHeight, roundHeight);
        }else {
            float density = context.getResources().getDisplayMetrics().density;
            roundWidth = (int) (roundWidth*density);
            roundHeight = (int) (roundHeight*density);
        }

        paint = new Paint();
        paint.setColor(Color.WHITE);
        paint.setAntiAlias(true);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));

        paint2 = new Paint();
        paint2.setXfermode(null);
    }

    @Override
    public void draw(Canvas canvas) {
        Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Config.ARGB_8888);
        Canvas canvas2 = new Canvas(bitmap);
        super.draw(canvas2);
        drawLiftUp(canvas2);
        drawRightUp(canvas2);
        drawLiftDown(canvas2);
        drawRightDown(canvas2);
        canvas.drawBitmap(bitmap, 0, 0, paint2);
        bitmap.recycle();
    }

    private void drawLiftUp(Canvas canvas) {
        Path path = new Path();
        path.moveTo(0, roundHeight);
        path.lineTo(0, 0);
        path.lineTo(roundWidth, 0);
        path.arcTo(new RectF(
                0,
                0,
                roundWidth*2,
                roundHeight*2),
                -90,
                -90);
        path.close();
        canvas.drawPath(path, paint);
    }

    private void drawLiftDown(Canvas canvas) {
        Path path = new Path();
        path.moveTo(0, getHeight()-roundHeight);
        path.lineTo(0, getHeight());
        path.lineTo(roundWidth, getHeight());
        path.arcTo(new RectF(
                0,
                getHeight()-roundHeight*2,
                0+roundWidth*2,
                getWidth()),
                90,
                90);
        path.close();
        canvas.drawPath(path, paint);
    }

    private void drawRightDown(Canvas canvas) {
        Path path = new Path();
        path.moveTo(ge

补充：移动开发 , Android ,