我有一个应用程序,用户可以上传图像(将它们存储到firebase),当另一个用户也想通过电话保存该图像时,我有一个“下载”按钮。
我将权限添加到清单中
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
但我仍然收到以下消息:
E/Error:: /storage/emulated/0/test.JPEG (Permission denied)
我的代码如下:
class DownloadFileFromURL extends AsyncTask<String, String, String> {
/**
* Downloading file in background thread
* */
@Override
protected String doInBackground(String... f_url) {
int count;
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
// this will be useful so that you can show a tipical 0-100%
// progress bar
int lenghtOfFile = conection.getContentLength();
// download the file
InputStream input = new BufferedInputStream(url.openStream(),
8192);
// Output stream
OutputStream output = new FileOutputStream(Environment
.getExternalStorageDirectory().toString()
+ f_url[1]);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
这就是我的称呼
new DownloadFileFromURL().execute(photoUri,"/test.JPEG");
这是怎么了?有想法吗?