自定義的圓形圖片（一般用於頭像顯示部分）

自定義的類如下所示：（繼承現有的ImageView然後繪製圓形圖）

使用的時候直接在佈局中引入即可

<com.icbc.elife.views.CircleImageView

android:id="@+id/logo"

android:layout_width="70dp"

android:layout_height="70dp"

android:scaleType="fitXY"

android:src="@drawable/ic_launcher" />

實現類：

package com.icbc.elife.views;

 

import java.lang.ref.SoftReference;

 

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Path;

import android.graphics.PorterDuff;

import android.graphics.PorterDuffXfermode;

import android.graphics.RectF;

import android.util.AttributeSet;

import android.widget.ImageView;

 

public class CircleImageView extends ImageView {

 

private Paint paint;

private Paint paint2;

 

private int width;

private int height;

 

private int angleSize;

 

private SoftReference<Bitmap> sr;

 

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

super(context, attrs, defStyle);

init(context);

}

 

public CircleImageView(Context context, AttributeSet attrs) {

super(context, attrs);

init(context);

}

 

public CircleImageView(Context context) {

super(context);

init(context);

}

 

private void init(Context context) {

paint = new Paint(Paint.ANTI_ALIAS_FLAG);

paint.setColor(Color.WHITE);

paint.setAntiAlias(true);

paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));

 

paint2 = new Paint(Paint.ANTI_ALIAS_FLAG);

paint2.setXfermode(null);

 

}

 

@Override

public void draw(Canvas canvas) {

 

Bitmap bmpCache = null;

if (sr != null) {

bmpCache = sr.get();

}

 

if (bmpCache == null || bmpCache.isRecycled()

|| bmpCache.getWidth() != width

|| bmpCache.getHeight() != height) {

if (bmpCache != null) {

bmpCache.recycle();

}

bmpCache = Bitmap.createBitmap(width, height,

Bitmap.Config.ARGB_8888);

sr = new SoftReference<Bitmap>(bmpCache);

} else {

bmpCache.eraseColor(0);

}

 

Canvas canvas2 = new Canvas(bmpCache);

super.draw(canvas2);

drawLiftUp(canvas2);

drawRightUp(canvas2);

drawLiftDown(canvas2);

drawRightDown(canvas2);

canvas.drawBitmap(bmpCache, 0, 0, paint2);

 

}

 

private void drawLiftUp(Canvas canvas) {

Path path = new Path();

path.moveTo(0, angleSize);

path.lineTo(0, 0);

path.lineTo(angleSize, 0);

path.arcTo(new RectF(0, 0, angleSize * 2, angleSize * 2), -90, -90);

path.close();

canvas.drawPath(path, paint);

}

 

private void drawLiftDown(Canvas canvas) {

Path path = new Path();

path.moveTo(0, height - angleSize);

path.lineTo(0, height);

path.lineTo(angleSize, height);

path.arcTo(new RectF(0, height - angleSize * 2, 0 + angleSize * 2,

getHeight()), 90, 90);

path.close();

canvas.drawPath(path, paint);

}

 

private void drawRightDown(Canvas canvas) {

Path path = new Path();

path.moveTo(width - angleSize, height);

path.lineTo(width, height);

path.lineTo(width, height - angleSize);

path.arcTo(new RectF(width - angleSize * 2, height - angleSize * 2,

width, height), 0, 90);

path.close();

canvas.drawPath(path, paint);

}

 

private void drawRightUp(Canvas canvas) {

Path path = new Path();

path.moveTo(width, angleSize);

path.lineTo(width, 0);

path.lineTo(width - angleSize, 0);

path.arcTo(

new RectF(width - angleSize * 2, 0, width, 0 + angleSize * 2),

-90, 90);

path.close();

canvas.drawPath(path, paint);

}

 

@Override

protected void onSizeChanged(int w, int h, int oldw, int oldh) {

super.onSizeChanged(w, h, oldw, oldh);

width = w;

height = h;

angleSize = ((width <= height) ? width : height) / 2;

}

 

}