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POInstantiationException occur while Downloading using Service
 

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    <p>I was trying to do a service sample program and i am getting following exception</p> <blockquote> <p>09-10 20:57:57.871: E/AndroidRuntime(280): FATAL EXCEPTION: main 09-10 20:57:57.871: E/AndroidRuntime(280): java.lang.RuntimeException: Unable to instantiate service com.example.demoservice.DownloadService: java.lang.InstantiationException: com.example.demoservice.DownloadService</p> </blockquote> <p>I have seen many solutions to this type of execption like passing string to constructor etc.But those solutions didnt solved this issue.</p> <p>Code sample is given below</p> <pre><code>public class MainActivity extends Activity { TextView textView ; private BroadcastReceiver receiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub Bundle bundle = intent.getExtras(); if(bundle != null){ String filepath = bundle.getString(DownloadService.FILEPATH); int result = bundle.getInt(DownloadService.RESULT); if(result == Activity.RESULT_OK){ Toast.makeText(context, "Sucess" + filepath, Toast.LENGTH_SHORT).show(); } else{ Toast.makeText(context, "Sucess", Toast.LENGTH_SHORT).show(); } } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = (TextView) findViewById(R.id.status); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } public void onClick(View v){ Intent i = new Intent(this, DownloadService.class); i.putExtra(DownloadService.FILENAME, "index.html"); i.putExtra(DownloadService.URL, "http://www.vogella.com/index.html"); startService(i); textView.setText("Service started"); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); registerReceiver(receiver, new IntentFilter(DownloadService.NOTIFICATION)); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); unregisterReceiver(receiver); } </code></pre> <p>}</p> <p>Service class</p> <pre><code>public class DownloadService extends IntentService{ private int result = Activity.RESULT_CANCELED; public static final String URL = "urlpath"; public static final String FILENAME = "filename"; public static final String FILEPATH = "filepath"; public static final String RESULT = "result"; public static final String NOTIFICATION = "com.vogella.android.service.receiver"; public DownloadService(String name) { super("DownloadService"); // TODO Auto-generated constructor stub } @Override protected void onHandleIntent(Intent intent) { // TODO Auto-generated method stub String urlpath = intent.getStringExtra(URL); String filename = intent.getStringExtra(urlpath); File output = new File(Environment.getExternalStorageDirectory(), filename); if(output.exists()){ output.delete(); } InputStream input = null; FileOutputStream fout = null; try { java.net.URL url = new java.net.URL(urlpath); input = url.openConnection().getInputStream(); InputStreamReader reader = new InputStreamReader(input); fout = new FileOutputStream(output.getPath()); int next = -1; while((next = reader.read())!= -1){ fout.write(next); } result = Activity.RESULT_OK; } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally{ if(input != null){ try { input.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if(fout != null){ try { fout.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } publishResult( output.getAbsoluteFile(), result); } private void publishResult(File absoluteFile, int result2) { // TODO Auto-generated method stub Intent intent = new Intent(this,DownloadService.class); intent.putExtra(FILEPATH, absoluteFile); intent.putExtra(RESULT, result2); sendBroadcast(intent); } </code></pre> <p>}</p> <p>I am running app using Emulator.Is it possible to run this problem in emulator,because writing to external directory</p> <p>Can anyone help me?</p>
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