Android圆形头像实现

如图所示，实现一个QQ圆形头像，话不多说，直接上代码，继承ImageView类，重写里面的方法：

package com.example.boo.com.tool;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

/** * Created by 海洋之言 on 2017/7/21. */
public class XCRoundImageView extends ImageView{
    private Paint paint ;

    public XCRoundImageView(Context context) {
        this(context,null);
    }

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

    public XCRoundImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        paint = new Paint();

    }

    /** * 绘制圆形图片 * @author caizhiming */
    @Override
    protected void onDraw(Canvas canvas) {

        Drawable drawable = getDrawable();
        if (null != drawable) {
            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
            Bitmap b = getCircleBitmap(bitmap, 14);
            final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight());
            final Rect rectDest = new Rect(0,0,getWidth(),getHeight());
            paint.reset();
            canvas.drawBitmap(b, rectSrc, rectDest, paint);

        } else {
            super.onDraw(canvas);
        }
    }

    /** * 获取圆形图片方法 * @param bitmap * @param pixels * @return Bitmap * @author caizhiming */
    private Bitmap getCircleBitmap(Bitmap bitmap, int pixels) {
        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
                bitmap.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final int color = 0xff424242;

        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        int x = bitmap.getWidth();

        canvas.drawCircle(x / 2, x / 2, x / 2, paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);
        return output;


    }
}

然后在xml加载写好的XCRoundImageView

   <com.example.boo.com.tool.XCRoundImageView
            android:layout_width="85dip"
            android:layout_height="85dip"
            android:layout_marginLeft="70dip"
            android:layout_gravity="center"
            android:src="@drawable/i"/>