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FROM： githhub；
自定义的ImageView类：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 | package com.example.testcircleimageview; 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.ColorFilter; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.RectF; import android.graphics.Shader; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.ColorDrawable; import android.graphics.drawable.Drawable; import android.net.Uri; import android.util.AttributeSet; import android.widget.ImageView; 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 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 ColorFilter mColorFilter; private boolean mReady; private boolean mSetupPending; 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.drawCircle(getWidth() / 2 , getHeight() / 2 , 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 int getBorderWidth() { return mBorderWidth; } 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(); } @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 (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 ); 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); } } |
2.在attrs文件中添加：
| 1 2 3 4 | <declare-styleable name= "CircleImageView" > <attr name= "border_width" format= "dimension" /> <attr name= "border_color" format= "color" /> </declare-styleable> |
3.在布局文件中申明使用：
| 1 2 3 4 5 6 | <com.example.testcircleimageview.CircleImageView android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:src= "@drawable/icon" app:border_color= "@android:color/black" app:border_width= "10dp" /> |
4.效果：
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本文转自wauoen51CTO博客，原文链接：http://blog.51cto.com/7183397/1608761 ，如需转载请自行联系原作者