Android圓形頭像圖Circle ImageView

《Android圓形頭像圖Circle ImageView》

需要處理的原始圖（pic）：

使用CircleImageView處理後的圖（作為頭像）：

現在很多的應用都有設置頭像的功能，如QQ、微信、微博等。頭像有標准的四方形，也有圓形（如QQ）。現在結合他人的代碼加以修改，給出一個以原始圖形中心為原點，修剪圖片為頭像的工具類，此類

可以直接在布局文件中加載使用，比如：

CircleImageView.java的完整源代碼：

package zhangphil.circle;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.FloatMath;
import android.widget.ImageView;

/**
 * @author Phil
 *
 */
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;

	// 圓形邊框的厚度默認值。
	// 如果是0，則沒有天藍色漸變的邊框。
	private static final int DEFAULT_BORDER_WIDTH = 20;

	private static final int DEFAULT_BORDER_COLOR = Color.BLACK;

	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 int mBorderColor = DEFAULT_BORDER_COLOR;
	private int mBorderWidth = DEFAULT_BORDER_WIDTH;

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

	private float mDrawableRadius;
	private float mBorderRadius;

	private boolean mReady;
	private boolean mSetupPending;
	private final Paint mFlagBackgroundPaint = new Paint();
	private final TextPaint mFlagTextPaint = new TextPaint();
	private String mFlagText;
	private boolean mShowFlag = false;
	private Rect mFlagTextBounds = new Rect();

	Shader mSweepGradient = null;

	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_border_width,
		// DEFAULT_BORDER_WIDTH);
		// mBorderColor = a.getColor(R.styleable.CircleImageView_border_color,
		// DEFAULT_BORDER_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 (getDrawable() == null) {
			return;
		}

		canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius,
				mBitmapPaint);
		if (mBorderWidth != 0) {
			canvas.save();
			canvas.rotate(20, getWidth() / 2, getHeight() / 2);
			canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius,
					mBorderPaint);
			canvas.restore();
		}

		if (mShowFlag && mFlagText != null) {
			canvas.drawArc(mBorderRect, 40, 100, false, mFlagBackgroundPaint);
			mFlagTextPaint.getTextBounds(mFlagText, 0, mFlagText.length(),
					mFlagTextBounds);
			canvas.drawText(mFlagText, getWidth() / 2,
					(3 + FloatMath.cos((float) (Math.PI * 5 / 18)))
							* getHeight() / 4 + mFlagTextBounds.height() / 3,
					mFlagTextPaint);
		}

	}

	@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 int getBorderWidth() {
		return mBorderWidth;
	}

	/**
	 * @param borderWidth
	 *            圓形的邊框厚度。
	 */
	public void setBorderWidth(int borderWidth) {
		if (borderWidth == mBorderWidth) {
			return;
		}

		mBorderWidth = borderWidth;
		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 = getBitmapFromDrawable(getDrawable());
		setup();
	}

	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 (OutOfMemoryError e) {
			return null;
		}
	}

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

		if (mBitmap == null) {
			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);

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

		mBorderRect.set(0, 0, getWidth(), getHeight());
		mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2,
				(mBorderRect.width() - mBorderWidth) / 2);

		mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width()
				- mBorderWidth, mBorderRect.height() - mBorderWidth);
		mDrawableRadius = Math.min(mDrawableRect.height() / 2,
				mDrawableRect.width() / 2);

		mFlagBackgroundPaint.setColor(Color.BLACK & 0x66FFFFFF);
		mFlagBackgroundPaint.setFlags(TextPaint.ANTI_ALIAS_FLAG);

		mFlagTextPaint.setFlags(TextPaint.ANTI_ALIAS_FLAG);
		mFlagTextPaint.setTextAlign(Align.CENTER);
		mFlagTextPaint.setColor(Color.WHITE);
		mFlagTextPaint
				.setTextSize(getResources().getDisplayMetrics().density * 18);

		mSweepGradient = new SweepGradient(getWidth() / 2, getHeight() / 2,
				new int[] { Color.rgb(255, 255, 255), Color.rgb(1, 209, 255) },
				null);

		mBorderPaint.setShader(mSweepGradient);

		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) + mBorderWidth,
				(int) (dy + 0.5f) + mBorderWidth);

		mBitmapShader.setLocalMatrix(mShaderMatrix);
	}

	public void setShowFlag(boolean show) {
		mShowFlag = show;
		invalidate();
	}

	public void setFlagText(String text) {
		mFlagText = text;
		invalidate();
	}
}