解决CircleImageView不能用Afinal的FinalBitmap加载网络图片问题

相信好多项目中都会用到类似QQ头像的圆形ImageView，最近小编在项目就用到这个圆形的ImageView，于是在网上找到了开源项目CircleImageView。用的时候感觉不错，但是在利用Afinal框架的display方法加载网络图片时，总是显示不出来，甚是苦恼。当然解决问题的最好的办法就是读源码，于是我看一下CircleImageView的源码，发现它需

要一个bitmap通过裁剪显示圆形的，而Afinal框架的display方法则不能提供一个bitmap。这时我就找FinalBitmap有没有提供一个方法返回的是bitmap的，很遗憾没有给我们提供这样的方法。后来我查找ImageLoader框架，发现它给我提供了一个这样的方法loadImageSync，它可以通过URL返回的一个bitmap，再把这个bitmap提供CircleImageView就能很好的显示图片了。但是特别要注意的是，loadImageSync这个方法是同步的，不是异步的，android4.0有个特性，网络操作不能在主线程，意思是这个方法必须要开一个线程操作。不然直接使用会报错的。

这个就是我在CircleImageView中新增的方法

/**
	 * 为圆形Iamge设置IamgeUrl
	 * 
	 * @param url 图片的url
	 */
	public void setImageURL(final String url) {

		final Handler handler = new Handler() {
			@Override
			public void handleMessage(Message msg) {
				super.handleMessage(msg);
				setImageBitmap(bitmap);
			}
		};

		/**
		 * 网络操作相关的子线程
		 */
		new Thread(new Runnable() {

			@Override
			public void run() {
				// TODO
				// 在这里进行 http request.网络请求相关操作
				Message msg = new Message();
				bitmap = ImageLoader.getInstance().loadImageSync(url);
				handler.sendMessage(msg);
			}
		}).start();

	}

修改过后的CircleImageView，可以拿去直接使用了

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_FILL_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 mFillPaint = new Paint();

	private int mBorderColor = DEFAULT_BORDER_COLOR;
	private int mBorderWidth = DEFAULT_BORDER_WIDTH;
	private int mFillColor = DEFAULT_FILL_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 Context mContext;
	private Bitmap bitmap = null;

	public CircleImageView(Context context) {
		super(context);
		this.mContext = context;
		init();
	}

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

	public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		this.mContext = context;
		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);
		mFillColor = a.getColor(R.styleable.CircleImageView_civ_fill_color,
				DEFAULT_FILL_COLOR);

		a.recycle();

		init();
	}

	private void init() {
		super.setScaleType(SCALE_TYPE);

		mReady = true;

		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 (mBitmap == null) {
			return;
		}

		if (mFillColor != Color.TRANSPARENT) {
			canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f,
					mDrawableRadius, mFillPaint);
		}
		canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f,
				mDrawableRadius, mBitmapPaint);
		if (mBorderWidth != 0) {
			canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f,
					mBorderRadius, mBorderPaint);
		}
	}

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

	public int getBorderColor() {
		return mBorderColor;
	}

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

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

	public void setBorderColorResource(int borderColorRes) {
		setBorderColor(getContext().getResources().getColor(borderColorRes));
	}

	public int getFillColor() {
		return mFillColor;
	}

	public void setFillColor(int fillColor) {
		if (fillColor == mFillColor) {
			return;
		}

		mFillColor = fillColor;
		mFillPaint.setColor(fillColor);
		invalidate();
	}

	public void setFillColorResource(int fillColorRes) {
		setFillColor(getContext().getResources().getColor(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();
	}

	@Override
	public void setImageBitmap(Bitmap bm) {
		super.setImageBitmap(bm);
		mBitmap = bm;
		setup();
	}

	@Override
	public void setImageDrawable(Drawable drawable) {
		super.setImageDrawable(drawable);
		mBitmap = getBitmapFromDrawable(drawable);
		setup();
	}

	@Override
	public void setImageResource(int resId) {
		super.setImageResource(resId);
		mBitmap = getBitmapFromDrawable(getDrawable());
		setup();
	}

	@Override
	public void setImageURI(Uri uri) {
		super.setImageURI(uri);
		mBitmap = uri != null ? getBitmapFromDrawable(getDrawable()) : null;
		setup();
	}

	/**
	 * 为圆形Iamge设置IamgeUrl
	 * 
	 * @param url 图片的url
	 */
	public void setImageURL(final String url) {

		final Handler handler = new Handler() {
			@Override
			public void handleMessage(Message msg) {
				super.handleMessage(msg);
				setImageBitmap(bitmap);
			}
		};

		/**
		 * 网络操作相关的子线程
		 */
		new Thread(new Runnable() {

			@Override
			public void run() {
				// TODO
				// 在这里进行 http request.网络请求相关操作
				Message msg = new Message();
				bitmap = ImageLoader.getInstance().loadImageSync(url);
				handler.sendMessage(msg);
			}
		}).start();

	}

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

		mColorFilter = cf;
		mBitmapPaint.setColorFilter(mColorFilter);
		invalidate();
	}

	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 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);

		mFillPaint.setStyle(Paint.Style.FILL);
		mFillPaint.setAntiAlias(true);
		mFillPaint.setColor(mFillColor);

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

		mBorderRect.set(0, 0, getWidth(), getHeight());
		mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2.0f,
				(mBorderRect.width() - mBorderWidth) / 2.0f);

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

		updateShaderMatrix();
		invalidate();
	}

	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);
	}

}

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