Android 图片设置圆角形式

1.自定义的图片圆角形式CircleImageView类

public class CircleImageView extends ImageView {private static final Xfermode MASK_XFERMODE;private Bitmap mask;private Paint paint;private int mBorderWidth = 10;private int mBorderColor = Color.parseColor("#f2f2f2");private boolean useDefaultStyle = false;static {PorterDuff.Mode localMode = PorterDuff.Mode.DST_IN;MASK_XFERMODE = new PorterDuffXfermode(localMode);}public CircleImageView(Context context) {super(context);}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.CircularImage);mBorderColor = a.getColor(R.styleable.CircularImage_border_color, mBorderColor);final int def = (int) (2 * context.getResources().getDisplayMetrics().density + 0.5f);mBorderWidth = a.getDimensionPixelOffset(R.styleable.CircularImage_border_width, def);a.recycle();}private void useDefaultStyle(boolean useDefaultStyle) {this.useDefaultStyle = useDefaultStyle;}@Overrideprotected void onDraw(Canvas canvas) {if (useDefaultStyle) {super.onDraw(canvas);return;}final Drawable localDraw = getDrawable();if (localDraw == null) {return;}if (localDraw instanceof NinePatchDrawable) {return;}if (this.paint == null) {final Paint localPaint = new Paint();localPaint.setFilterBitmap(false);localPaint.setAntiAlias(true);localPaint.setXfermode(MASK_XFERMODE);this.paint = localPaint;}final int width = getWidth();final int height = getHeight();/** 保存layer */int layer = canvas.saveLayer(0.0F, 0.0F, width, height, null, 31);/** 设置drawable的大小 */localDraw.setBounds(0, 0, width, height);/** 将drawable绑定到bitmap(this.mask)上面（drawable只能通过bitmap显示出来） */localDraw.draw(canvas);if ((this.mask == null) || (this.mask.isRecycled())) {this.mask = createOvalBitmap(width, height);}/** 将bitmap画到canvas上面 */canvas.drawBitmap(this.mask, 0.0F, 0.0F, this.paint);/** 将画布复制到layer上 */canvas.restoreToCount(layer);drawBorder(canvas, width, height);}/*** 绘制圆形边框*/private void drawBorder(Canvas canvas, final int width, final int height) {if (mBorderWidth == 0) {return;}final Paint mBorderPaint = new Paint();mBorderPaint.setStyle(Paint.Style.STROKE);mBorderPaint.setAntiAlias(true);mBorderPaint.setColor(mBorderColor);mBorderPaint.setStrokeWidth(mBorderWidth);canvas.drawCircle(width / 2, height / 2, (width - mBorderWidth) / 2, mBorderPaint);canvas = null;}public Bitmap createOvalBitmap(final int width, final int height) {Bitmap.Config localConfig = Bitmap.Config.ARGB_8888;Bitmap localBitmap = Bitmap.createBitmap(width, height, localConfig);Canvas localCanvas = new Canvas(localBitmap);Paint localPaint = new Paint();final int padding = (mBorderWidth - 3) > 0 ? mBorderWidth - 3 : 1;/*** 设置椭圆的大小(因为椭圆的最外边会和border的最外边重合的，如果图片最外边的颜色很深，有看出有棱边的效果，所以为了让体验更加好，* 让其缩进padding px)*/RectF localRectF = new RectF(padding, padding, width - padding, height - padding);localCanvas.drawOval(localRectF, localPaint);return localBitmap;}
}

1.1 在values目录下创建一个circle_attr.xml，文件内容：

<resources><declare-styleable name="CircularImage"><attr name="border_width" format="dimension" /><attr name="border_color" format="color" />declare-styleable>
resources>

如下图：

2.activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"><ImageViewandroid:layout_width="100dp"android:layout_height="100dp"android:src="@drawable/ic_sp" /><com.demo.test.bitmap.CircleImageViewandroid:layout_width="100dp"android:layout_height="100dp"android:layout_marginLeft="50dp"android:src="@drawable/ic_sp" />LinearLayout>
LinearLayout>

3.MainActivity.java

public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}
}

运行后结果：

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