Question

这里我的要求是，我需要通过使用Retrofit从URL下载位图，并需要设置为Notification Icon.I尝试但我得到空指针异常。我不想将其下载到任何文件或文件夹。直接我想使用返回位图来通知图标。请帮助我错了

我的代码：

if (photourl != null) {
if ((photourl.endsWith(".jpg") || photourl.endsWith(".png") || photourl.endsWith(".jpeg") )) {
    if(messageType!=6 && messageType!=7){
      RoundCornerImg RCIMG = new RoundCornerImg();
      bm = RCIMG.getRoundedRectBitmap(getImageBitmap(photourl), 10);

     }else{
       bm = getImageBitmap(photourl);
       }
      photo_flag = true;
       }
  }

获取图像位图方法：

 private Bitmap getImageBitmap(String url) {

        Call<ResponseBody> call=RetroApiCall.getNotificationImage(url);

        call.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                if (response.isSuccessful()) {
                     bitmap =BitmapFactory.decodeStream(response.body().byteStream());
                }else{
                    bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
                    if (Build.VERSION.SDK_INT >= 20) {
                        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.notification);
                    }
                }
            }

            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {

            }
        });


    return bitmap;
}

谢谢！

Answer 1

这里的方法 getImageBitmap 位图被错误地转换了。我通过以下代码解决了它

private void getImageBitmap(String url) {


    Call<ResponseBody> request = RetroApiCall.getNotificationImage(url);

    try {
        downloadFile(request.execute().body());

    } catch (IOException e) {

        e.printStackTrace();
        Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
    }
}

private void downloadFile(ResponseBody body) throws IOException {

    InputStream bis = new BufferedInputStream(body.byteStream(), 1024 * 8);
    Bitmap bitmap = BitmapFactory.decodeStream(bis);
    setBitmap(bitmap);

}

我终于得到了答案!!!

Answer 2

private Target target = new Target() {
      @Override
      public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
      }

      @Override
      public void onBitmapFailed(Drawable errorDrawable) {
      }

      @Override
      public void onPrepareLoad(Drawable placeHolderDrawable) {
      }
}

private void someMethod() {
   Picasso.with(this).load("url").into(target);
}

@Override 
public void onDestroy() {  // could be in onPause or onStop
   Picasso.with(this).cancelRequest(target);
   super.onDestroy();
}

如何使用Retrofit从URL下载图像并设置为通知图标

2 个答案: