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[操作系统]自定义View,圆形头像


1. 效果图

QQ图片20151208111358

2.

<com.etoury.etoury.ui.view.CircleImg      android:id="@+id/user_info_head_img"      android:layout_width="120dp"      android:layout_height="120dp"      android:layout_centerInParent="true"      android:src="@drawable/ic_user" ></com.etoury.etoury.ui.view.CircleImg>

3. 自定义view

CircleImg.java

package com.etoury.etoury.ui.view;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PixelFormat;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.Bitmap.Config;import android.graphics.PorterDuff.Mode;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.ImageView;public class CircleImg extends ImageView{  public CircleImg(Context context) {    super(context);    // TODO Auto-generated constructor stub  }  public CircleImg(Context context, AttributeSet attrs) {    super(context, attrs);  }  public CircleImg(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);  }  @Override  protected void onDraw(Canvas canvas) {    Drawable drawable = getDrawable();    if (drawable == null) {      return;    }    if (getWidth() == 0 || getHeight() == 0) {      return;    }    int width = drawable.getIntrinsicWidth();    int height = drawable.getIntrinsicHeight();    Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888        : Bitmap.Config.RGB_565;    Bitmap b = Bitmap.createBitmap(width, height, config);    // Bitmap b = ((BitmapDrawable) drawable).getBitmap();    // 注意,下面三行代码要用到,否在在View或者surfaceview里的canvas.drawBitmap会看不到图    Canvas can = new Canvas(b);    drawable.setBounds(0, 0, width, height);    drawable.draw(can);    if (null == b) {      return;    }    Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);    int w = getWidth(), h = getHeight();    Bitmap roundBitmap = getCroppedBitmap(bitmap, w);    canvas.drawBitmap(roundBitmap, 0, 0, null);  }  public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {    Bitmap sbmp;    if (bmp.getWidth() != radius || bmp.getHeight() != radius)      sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);    else      sbmp = bmp;    Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), sbmp.getHeight(),        Config.ARGB_8888);    Canvas canvas = new Canvas(output);    final int color = 0xffa19774;    final Paint paint = new Paint();    final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());    paint.setAntiAlias(true);    paint.setFilterBitmap(true);    paint.setDither(true);    canvas.drawARGB(0, 0, 0, 0);    paint.setColor(Color.parseColor("#BAB399"));    canvas.drawCircle(sbmp.getWidth() / 2 + 0.7f,        sbmp.getHeight() / 2 + 0.7f, sbmp.getWidth() / 2 + 0.1f, paint);    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));    canvas.drawBitmap(sbmp, rect, rect, paint);    return output;  }}