尝试使用RoundedDrawable类（从https://github.com/vinc3m1/RoundedImageView获取）将图像插入到圆角图像中。
图片来自网址。如果我使用Koushik dutta的ION库来处理图像，我会收到以下错误：
09-27 21:35:06.187: E/AndroidRuntime(12606): FATAL EXCEPTION: main
09-27 21:35:06.187: E/AndroidRuntime(12606): Process: com.ylg.maps, PID: 12606
09-27 21:35:06.187: E/AndroidRuntime(12606): java.lang.ClassCastException: com.koushikdutta.ion.IonDrawable cannot be cast to android.graphics.drawable.BitmapDrawable
09-27 21:35:06.187: E/AndroidRuntime(12606): at com.ylg.otherlibs.RoudImageViewForMap.loadBitmap(RoudImageViewForMap.java:70)
09-27 21:35:06.187: E/AndroidRuntime(12606): at com.ylg.otherslibs.RoudImageViewForMap.onDraw(RoudImageViewForMap.java:80)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.view.View.draw(View.java:14465)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.view.View.draw(View.java:14350)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.view.ViewGroup.drawChild(ViewGroup.java:3103)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.view.View.buildDrawingCache(View.java:13673)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.view.View.buildDrawingCache(View.java:13522)
09-27 21:35:06.187: E/AndroidRuntime(12606): at com.ylg.maps.Mapsthree.createDrawableFromView(Mapsthree.java:454)
09-27 21:35:06.187: E/AndroidRuntime(12606): at com.ylg.maps.Mapsthree.loadFriends(Mapsthree.java:417)
09-27 21:35:06.187: E/AndroidRuntime(12606): at com.ylg.maps.Mapsthree.access$24(Mapsthree.java:402)
09-27 21:35:06.187: E/AndroidRuntime(12606): at com.ylg.maps.Mapsthree$LoadUsers.onPostExecute(Mapsthree.java:660)
09-27 21:35:06.187: E/AndroidRuntime(12606): at com.ylg.maps.Mapsthree$LoadUsers.onPostExecute(Mapsthree.java:1)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.os.AsyncTask.finish(AsyncTask.java:632)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.os.AsyncTask.access$600(AsyncTask.java:177)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.os.Handler.dispatchMessage(Handler.java:102)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.os.Looper.loop(Looper.java:136)
09-27 21:35:06.187: E/AndroidRuntime(12606): at android.app.ActivityThread.main(ActivityThread.java:5001)
09-27 21:35:06.187: E/AndroidRuntime(12606): at java.lang.reflect.Method.invoke(Native Method)
09-27 21:35:06.187: E/AndroidRuntime(12606): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
09-27 21:35:06.187: E/AndroidRuntime(12606): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
看起来ION库支持ImageView不支持自定义图像视图？有没有人有这样的问题，如果是这样，它是如何解决的？
谢谢！
答案 0 :(得分：6)
我个人使用Ion的回调来自己设置ImageView的{{1}}，然后将其设为循环（或其他）：
Bitmap这种通用结构允许您以任何方式使用final ImageView imageView = (ImageView) ...
Ion.with(context)
.load(url)
.asBitmap()
.setCallback(new FutureCallback<Bitmap>() {
@Override
public void onCompleted(final Exception e, final Bitmap bitmap) {
// check for (e != null)
final Bitmap circleBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
final BitmapShader shader = new BitmapShader (bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
final Paint paint = new Paint();
paint.setShader(shader);
final Canvas canvas = new Canvas(circleBitmap);
canvas.drawCircle(bitmap.getWidth() / 2, bitmap.getHeight() / 2, bitmap.getWidth() / 2, paint);
// maybe bitmap.recycle() here?
imageView.setImageBitmap(circularBitmap);
}
});
。
编辑：如果您使用支持资源库v4，则应改为使用RoundedBitmapDrawable：
Bitmap