CircleImageView圆形头像点击事件

        关于CircleImageView就不多说了，网上关于这个的源码解读也很多。但是找了好久没看到有关于点击之后的响应事件，在此记录一下。先贴上代码：

public class CircleImageView extends ImageView  {


    private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;

    private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;
    private static final int COLORDRAWABLE_DIMENSION = 2;

    private static final int DEFAULT_BORDER_WIDTH = 0;
    private static final int DEFAULT_BORDER_COLOR = Color.BLACK;
    private static final int DEFAULT_CIRCLE_BACKGROUND_COLOR = Color.TRANSPARENT;
    private static final boolean DEFAULT_BORDER_OVERLAY = false;

    private final RectF mDrawableRect = new RectF();
    private final RectF mBorderRect = new RectF();

    private final Matrix mShaderMatrix = new Matrix();
    private final Paint mBitmapPaint = new Paint();
    private final Paint mBorderPaint = new Paint();
    private final Paint mCircleBackgroundPaint = new Paint();

    private int mBorderColor = DEFAULT_BORDER_COLOR;
    private int mBorderWidth = DEFAULT_BORDER_WIDTH;
    private int mCircleBackgroundColor = DEFAULT_CIRCLE_BACKGROUND_COLOR;

    private Bitmap mBitmap;
    private BitmapShader mBitmapShader;
    private int mBitmapWidth;
    private int mBitmapHeight;

    private float mDrawableRadius;
    private float mBorderRadius;

    private ColorFilter mColorFilter;

    private boolean mReady;
    private boolean mSetupPending;
    private boolean mBorderOverlay;
    private boolean mDisableCircularTransformation;

    public CircleImageView(Context context) {
        super(context);
        init();
    }

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

    public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);

        mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_civ_border_width, DEFAULT_BORDER_WIDTH);
        mBorderColor = a.getColor(R.styleable.CircleImageView_civ_border_color, DEFAULT_BORDER_COLOR);
        mBorderOverlay = a.getBoolean(R.styleable.CircleImageView_civ_border_overlay, DEFAULT_BORDER_OVERLAY);

        // Look for deprecated civ_fill_color if civ_circle_background_color is not set
        if (a.hasValue(R.styleable.CircleImageView_civ_circle_background_color)) {
            mCircleBackgroundColor = a.getColor(R.styleable.CircleImageView_civ_circle_background_color,
                    DEFAULT_CIRCLE_BACKGROUND_COLOR);
        } else if (a.hasValue(R.styleable.CircleImageView_civ_fill_color)) {
            mCircleBackgroundColor = a.getColor(R.styleable.CircleImageView_civ_fill_color,
                    DEFAULT_CIRCLE_BACKGROUND_COLOR);
        }

        a.recycle();

        init();
    }


    private void init() {
        super.setScaleType(SCALE_TYPE);
        mReady = true;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            setOutlineProvider(new OutlineProvider());
        }

        if (mSetupPending) {
            setup();
            mSetupPending = false;
        }
    }

    @Override
    public ScaleType getScaleType() {
        return SCALE_TYPE;
    }

    @Override
    public void setScaleType(ScaleType scaleType) {
        if (scaleType != SCALE_TYPE) {
            throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));
        }
    }

    @Override
    public void setAdjustViewBounds(boolean adjustViewBounds) {
        if (adjustViewBounds) {
            throw new IllegalArgumentException("adjustViewBounds not supported.");
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (mDisableCircularTransformation) {
            super.onDraw(canvas);
            return;
        }

        if (mBitmap == null) {
            return;
        }

        if (mCircleBackgroundColor != Color.TRANSPARENT) {
            canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mCircleBackgroundPaint);
        }
        canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mBitmapPaint);
        if (mBorderWidth > 0) {
            canvas.drawCircle(mBorderRect.centerX(), mBorderRect.centerY(), mBorderRadius, mBorderPaint);
        }
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        setup();
    }

    @Override
    public void setPadding(int left, int top, int right, int bottom) {
        super.setPadding(left, top, right, bottom);
        setup();
    }

    @Override
    public void setPaddingRelative(int start, int top, int end, int bottom) {
        super.setPaddingRelative(start, top, end, bottom);
        setup();
    }

    public int getBorderColor() {
        return mBorderColor;
    }

    public void setBorderColor(@ColorInt int borderColor) {
        if (borderColor == mBorderColor) {
            return;
        }

        mBorderColor = borderColor;
        mBorderPaint.setColor(mBorderColor);
        invalidate();
    }

    /**
     * @deprecated Use {@link #setBorderColor(int)} instead
     */
    @Deprecated
    public void setBorderColorResource(@ColorRes int borderColorRes) {
        setBorderColor(getContext().getResources().getColor(borderColorRes));
    }

    public int getCircleBackgroundColor() {
        return mCircleBackgroundColor;
    }

    public void setCircleBackgroundColor(@ColorInt int circleBackgroundColor) {
        if (circleBackgroundColor == mCircleBackgroundColor) {
            return;
        }

        mCircleBackgroundColor = circleBackgroundColor;
        mCircleBackgroundPaint.setColor(circleBackgroundColor);
        invalidate();
    }

    public void setCircleBackgroundColorResource(@ColorRes int circleBackgroundRes) {
        setCircleBackgroundColor(getContext().getResources().getColor(circleBackgroundRes));
    }

    /**
     * Return the color drawn behind the circle-shaped drawable.
     *
     * @return The color drawn behind the drawable
     *
     * @deprecated Use {@link #getCircleBackgroundColor()} instead.
     */
    @Deprecated
    public int getFillColor() {
        return getCircleBackgroundColor();
    }

    /**
     * Set a color to be drawn behind the circle-shaped drawable. Note that
     * this has no effect if the drawable is opaque or no drawable is set.
     *
     * @param fillColor The color to be drawn behind the drawable
     *
     * @deprecated Use {@link #setCircleBackgroundColor(int)} instead.
     */
    @Deprecated
    public void setFillColor(@ColorInt int fillColor) {
        setCircleBackgroundColor(fillColor);
    }

    /**
     * Set a color to be drawn behind the circle-shaped drawable. Note that
     * this has no effect if the drawable is opaque or no drawable is set.
     *
     * @param fillColorRes The color resource to be resolved to a color and
     *                     drawn behind the drawable
     *
     * @deprecated Use {@link #setCircleBackgroundColorResource(int)} instead.
     */
    @Deprecated
    public void setFillColorResource(@ColorRes int fillColorRes) {
        setCircleBackgroundColorResource(fillColorRes);
    }

    public int getBorderWidth() {
        return mBorderWidth;
    }

    public void setBorderWidth(int borderWidth) {
        if (borderWidth == mBorderWidth) {
            return;
        }

        mBorderWidth = borderWidth;
        setup();
    }

    public boolean isBorderOverlay() {
        return mBorderOverlay;
    }

    public void setBorderOverlay(boolean borderOverlay) {
        if (borderOverlay == mBorderOverlay) {
            return;
        }

        mBorderOverlay = borderOverlay;
        setup();
    }

    public boolean isDisableCircularTransformation() {
        return mDisableCircularTransformation;
    }

    public void setDisableCircularTransformation(boolean disableCircularTransformation) {
        if (mDisableCircularTransformation == disableCircularTransformation) {
            return;
        }

        mDisableCircularTransformation = disableCircularTransformation;
        initializeBitmap();
    }

    @Override
    public void setImageBitmap(Bitmap bm) {
        super.setImageBitmap(bm);
        initializeBitmap();
    }

    @Override
    public void setImageDrawable(Drawable drawable) {
        super.setImageDrawable(drawable);
        initializeBitmap();
    }

    @Override
    public void setImageResource(@DrawableRes int resId) {
        super.setImageResource(resId);
        initializeBitmap();
    }

    @Override
    public void setImageURI(Uri uri) {
        super.setImageURI(uri);
        initializeBitmap();
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        if (cf == mColorFilter) {
            return;
        }

        mColorFilter = cf;
        applyColorFilter();
        invalidate();
    }

    @Override
    public ColorFilter getColorFilter() {
        return mColorFilter;
    }

    private void applyColorFilter() {
        if (mBitmapPaint != null) {
            mBitmapPaint.setColorFilter(mColorFilter);
        }
    }

    private Bitmap getBitmapFromDrawable(Drawable drawable) {
        if (drawable == null) {
            return null;
        }

        if (drawable instanceof BitmapDrawable) {
            return ((BitmapDrawable) drawable).getBitmap();
        }

        try {
            Bitmap bitmap;

            if (drawable instanceof ColorDrawable) {
                bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);
            } else {
                bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);
            }

            Canvas canvas = new Canvas(bitmap);
            drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
            drawable.draw(canvas);
            return bitmap;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    private void initializeBitmap() {
        if (mDisableCircularTransformation) {
            mBitmap = null;
        } else {
            mBitmap = getBitmapFromDrawable(getDrawable());
        }
        setup();
    }

    private void setup() {
        if (!mReady) {
            mSetupPending = true;
            return;
        }

        if (getWidth() == 0 && getHeight() == 0) {
            return;
        }

        if (mBitmap == null) {
            invalidate();
            return;
        }

        mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

        mBitmapPaint.setAntiAlias(true);
        mBitmapPaint.setShader(mBitmapShader);

        mBorderPaint.setStyle(Paint.Style.STROKE);
        mBorderPaint.setAntiAlias(true);
        mBorderPaint.setColor(mBorderColor);
        mBorderPaint.setStrokeWidth(mBorderWidth);

        mCircleBackgroundPaint.setStyle(Paint.Style.FILL);
        mCircleBackgroundPaint.setAntiAlias(true);
        mCircleBackgroundPaint.setColor(mCircleBackgroundColor);

        mBitmapHeight = mBitmap.getHeight();
        mBitmapWidth = mBitmap.getWidth();

        mBorderRect.set(calculateBounds());
        mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2.0f, (mBorderRect.width() - mBorderWidth) / 2.0f);

        mDrawableRect.set(mBorderRect);
        if (!mBorderOverlay && mBorderWidth > 0) {
            mDrawableRect.inset(mBorderWidth - 1.0f, mBorderWidth - 1.0f);
        }
        mDrawableRadius = Math.min(mDrawableRect.height() / 2.0f, mDrawableRect.width() / 2.0f);

        applyColorFilter();
        updateShaderMatrix();
        invalidate();
    }

    private RectF calculateBounds() {
        int availableWidth  = getWidth() - getPaddingLeft() - getPaddingRight();
        int availableHeight = getHeight() - getPaddingTop() - getPaddingBottom();

        int sideLength = Math.min(availableWidth, availableHeight);

        float left = getPaddingLeft() + (availableWidth - sideLength) / 2f;
        float top = getPaddingTop() + (availableHeight - sideLength) / 2f;

        return new RectF(left, top, left + sideLength, top + sideLength);
    }

    private void updateShaderMatrix() {
        float scale;
        float dx = 0;
        float dy = 0;

        mShaderMatrix.set(null);

        if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {
            scale = mDrawableRect.height() / (float) mBitmapHeight;
            dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;
        } else {
            scale = mDrawableRect.width() / (float) mBitmapWidth;
            dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;
        }

        mShaderMatrix.setScale(scale, scale);
        mShaderMatrix.postTranslate((int) (dx + 0.5f) + mDrawableRect.left, (int) (dy + 0.5f) + mDrawableRect.top);

        mBitmapShader.setLocalMatrix(mShaderMatrix);
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    private class OutlineProvider extends ViewOutlineProvider {

        @Override
        public void getOutline(View view, Outline outline) {
            Rect bounds = new Rect();
            mBorderRect.roundOut(bounds);
            outline.setRoundRect(bounds, bounds.width() / 2.0f);
        }

    }

}

        这是CircleImageView源码，之前我想着既然这个类继承于ImageView也应该有setOnClickListener方法，结果失败了。然后在MainActivity里面去初始化这个ImageView，尝试用ImageView imageView = findViewById（R.id.image），imageView.setOnclickListener（new ClickListener...）又出现一个问题，因为我在项目中使用的是侧滑菜单，然后在activity_main中include了这个menu_head，嵌套了两层，然后就找不到这个imageview的id，报空指针异常。

        然后我想着既然不能直接找到这个imageView的id，那就先找到它外层的layout id。

View headerLayout = navigationView.inflateHeaderView(R.layout.menu_head);
headImage = headerLayout.findViewById(R.id.person);
headImage.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        System.out.println("你点击了头像");
        changeImage();
    }
});

这个changeImage( )方法就是普通的调用相机的方法

//修改头像
    public void changeImage(){
        final String font[] = { "拍照", "从图库选择"};
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setItems(font, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        switch(font[which]){
                            case "拍照":
                                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                                String fileName = "IMG_" + DateFormat.format("yyyyMMdd_hhmmss",
                                        Calendar.getInstance(Locale.CHINA)) + ".jpg";
                                picture = new File(Environment.getExternalStorageDirectory()
                                        .getAbsolutePath() + "/DCIM/Camera", fileName);
                                Uri imageUri = Uri.fromFile(picture);
                                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);//直接使用，没有缩小
                                startActivityForResult(intent,6);

                                break;
                            case "从图库选择":
                                Intent i = new Intent(
                                        Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                                startActivityForResult(i, 7);

                        }
                    }
                }).setNegativeButton("Cancle", null)
                .setPositiveButton("OK", null).create().show();

}

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == 6){ //调用相机成功

            Uri uri = Uri.fromFile(picture);
            Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
            intent.setData(uri);
            this.sendBroadcast(intent);  // 发送广播让MediaScanner 扫描我们制定的文件
            // 这样在系统的相册中我们就可以找到所拍摄的照片了
            Bitmap bitmap = BitmapFactory.decodeFile(picture.toString());
            headImage = findViewById(R.id.person);
            if(bitmap != null) {
                headImage.setImageBitmap(bitmap);
            }
        }else if(requestCode == 7) {
            //从图库选择照片
            try {
                if(data.getData() != null) {  //不选中直接返回
                    Uri selectedImage = data.getData();
                    String[] filePathColumn = {MediaStore.Images.Media.DATA};

                    Cursor cursor = getContentResolver().query(selectedImage,
                            filePathColumn, null, null, null);
                    cursor.moveToFirst();

                    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                    String picturePath = cursor.getString(columnIndex);
                    headImage = findViewById(R.id.person);
                    headImage.setImageBitmap(BitmapFactory.decodeFile(picturePath));
                    cursor.close();
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

然后问题就解决了