I need my android app to make request to url to download an image from this url so I have built this class to help me, BUT it didn't work ???
public class MyAsnyc extends AsyncTask<Void, Void, Void> {
public static File file;
InputStream is;
protected void doInBackground() throws IOException {
File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
file = new File(path, "DemoPicture.jpg");
try{
// Make sure the Pictures directory exists.
path.mkdirs();
URL url = new URL("http://androidsaveitem.appspot.com/downloadjpg");
// Open a connection to that URL.
URLConnection ucon = url.openConnection();
// Define InputStreams to read from the URLConnection.
is = ucon.getInputStream();
} catch (IOException e) {
Log.d("ImageManager", "Error: " + e);
}
}
@Override
protected Void doInBackground(Void... params) {
try {
doInBackground();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
protected void onPostExecute() {
try {
OutputStream os = new FileOutputStream(file);
byte[] data = new byte[is.available()];
is.read(data);
os.write(data);
is.close();
os.close();
// Tell the media scanner about the new file so that it is
// immediately available to the user.
MediaScannerConnection.scanFile(
null,
new String[] { file.toString() },
null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
Log.i("ExternalStorage", "Scanned " + path + ":");
Log.i("ExternalStorage", "-> uri=" + uri);
}
}
);
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
And I have, in the Activity class on onclick(), this function:
public void down(View v) {
// ImageManager ob=new ImageManager();
// ob.DownloadFromUrl("");
new MyAsnyc().execute();
}
Although I have written the permissions in the manfiest.xml
<uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
try this
public class MyAsnyc extends AsyncTask<Void, Void, Void> {
public static File file;
InputStream is;
protected void doInBackground() throws IOException {
File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
file = new File(path, "DemoPicture.jpg");
try {
// Make sure the Pictures directory exists.
path.mkdirs();
URL url = new URL("http://androidsaveitem.appspot.com/downloadjpg");
/* Open a connection to that URL. */
URLConnection ucon = url.openConnection();
/*
* Define InputStreams to read from the URLConnection.
*/
is = ucon.getInputStream();
OutputStream os = new FileOutputStream(file);
byte[] data = new byte[is.available()];
is.read(data);
os.write(data);
is.close();
os.close();
} catch (IOException e) {
Log.d("ImageManager", "Error: " + e);
}
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
try {
doInBackground();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
protected void onPostExecute() {
try {
// Tell the media scanner about the new file so that it is
// immediately available to the user.
MediaScannerConnection.scanFile(null,
new String[]{file.toString()}, null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
Log.i("ExternalStorage", "Scanned " + path + ":");
Log.i("ExternalStorage", "-> uri=" + uri);
}
});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}