First define inner class like this in your class
class SaveTask extends AsyncTask<Void, Void, Void> {
ProgressDialog progressDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(getActivity());
progressDialog.setProgressStyle(R.style.NewDialog);
progressDialog.setMessage("Loading...");
progressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
String datafolder = Environment.getDataDirectory()
.getAbsolutePath() + File.separator + "app";
File customfolder = new File(Environment
.getExternalStorageDirectory().getAbsolutePath().toString()
+ File.separator + "BackupApps");
String comando = "cp -r /data/app /sdcard/BackupApps";
Process suProcess = null;
try {
suProcess = Runtime.getRuntime().exec("su");
} catch (IOException e3) {
// TODO Auto-generated catch block
e3.printStackTrace();
}
DataOutputStream os = new DataOutputStream(
suProcess.getOutputStream());
try {
os.writeBytes(comando + "\n");
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
try {
os.flush();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.writeBytes("exit\n");
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (progressDialog != null) {
if (progressDialog.isShowing()) {
progressDialog.dismiss();
}
}
}
}
call this in your onClick() like this.. here we haven't passing any data to AsynchTask so here i am passing null
copy.setOnClickListener(new OnClickListener() {
public void onClick(View v){
SaveTask task = new SaveTask();
task.execute(null, null, null);
}