Android图片圆形和矩形截图功能

项目中经常会用到一些图片的裁剪作为头像，需求基本是圆形或者是矩形的。
1、先上个效果图

2、背景是由选择图片传递过去显示的

主要思路
1、矩形在四周绘制四个矩形，为透明的黑色，注意绘制的四个矩形不要重叠，不然会有黑色的重叠框子无法查看，绘制完成边框之后，在中间绘制一个有白色边框的矩形。
2、圆形在四周绘制一个半径为高度一半的圆弧，为透明的黑色，绘制完边框之后，在中间绘制一个有白色变宽的圆形
3、获取bitmap，使用Bitmap.drawBitmap();方法，获取矩形或者圆形的bitmap

3、矩形主要代码

@Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        int width = this.getWidth();
        int height = this.getHeight();

        mWidth = width - mHorizontalPadding * 2;
        mVerticalPadding = (height - mWidth) / 2;
        mPaint.setColor(0xaa000000);
        //绘制左边
        canvas.drawRect(0, 0, mHorizontalPadding, height, mPaint);
        //绘制上边
        canvas.drawRect(mHorizontalPadding, 0, width - mHorizontalPadding, mVerticalPadding, mPaint);
        //绘制底部
        canvas.drawRect(mHorizontalPadding, height - mVerticalPadding, width - mHorizontalPadding, height, mPaint);
        //绘制右边
        canvas.drawRect(width - mHorizontalPadding, 0, width, height, mPaint);
        //绘制矩形边框
        mPaint.setColor(mBorderColor);
        mPaint.setStrokeWidth(mBorderWidth);
        mPaint.setStyle(Paint.Style.STROKE);
        canvas.drawRect(mHorizontalPadding, mVerticalPadding, width - mHorizontalPadding, height - mVerticalPadding, mPaint);
    }

4、圆形主要代码

@Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        int width = this.getWidth();
        int height = this.getHeight();

        int innerCircle = dip2px(mContext, 150); 
        int ringWidth = height;

        //绘制圆形
        mPaint.setColor(Color.WHITE);
        mPaint.setStrokeWidth(2);
        mPaint.setStyle(Paint.Style.STROKE);
        canvas.drawCircle(width / 2, height / 2, innerCircle, mPaint);

        //绘制圆形周边的背景
        mPaint.setColor(0xaa000000);
        mPaint.setStrokeWidth(ringWidth);
        canvas.drawCircle(width / 2, height / 2, innerCircle + 1 + ringWidth
                / 2, mPaint);

    }

5、布局主要代码

<com.tongju.common.widget.view.ClipImageView
        android:id="@+id/src_pic"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

    <com.tongju.common.widget.view.ClipRectangleView
        android:id="@+id/clipview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

6、Activity主要代码

@Route(path = RouterPath.ROUTER_COMMON_IMAGE_CLIP)
public class ClipImageActivity extends BaseActivity implements View.OnClickListener {

    private ClipImageView mClipImageView;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_clip_image);
    }

    @Override
    protected BasePresenter createPresenter() {
        return null;
    }

    @Override
    protected void findViews() {
        this.mClipImageView = findViewById(R.id.src_pic);
        findViewById(R.id.iv_back).setOnClickListener(this);
        findViewById(R.id.tv_use).setOnClickListener(this);
    }

    @Override
    protected void init() {
    //拍照或者选完相册照片传递uri过来
        Uri uri = getIntent().getParcelableExtra("image");
        Glide.with(this).load(uri).apply(new RequestOptions()
                .skipMemoryCache(true)
                .diskCacheStrategy(DiskCacheStrategy.NONE))
                .transition(withCrossFade()).into(mClipImageView);
    }

    @Override
    public void onClick(View v) {
        int id = v.getId();
        if (id == R.id.iv_back) {
            finish();
        } else if (id == R.id.tv_use) {
            Bitmap bitmap = mClipImageView.rectangleClip();
            //这边通过EventBus传递获取到的bitmap,因为bundle对bitmap传递有大小限制
            EventBus.getDefault().post(new MGetBitmap(bitmap));
            finish();
        }
    }

}

github代码
https://github.com/llayjun/android_common_use/tree/master/%E7%9F%A9%E5%BD%A2%E5%9C%86%E5%BD%A2%E8%A3%81%E5%89%AA%E5%A4%B4%E5%83%8F%E5%8A%9F%E8%83%BD