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I am working on Building up Android Music Player app. I finished designing and coding but when i run it in Emulator it gives me following error :

The application Droid Player (process com.droid.droidplayer) has stopped unexpectedly. Please try again.

Here is the source code link: Source code

There are no errors in source code but after running the app it shows errors in LogCat:

02-14 20:28:49.037: E/AndroidRuntime(383): FATAL EXCEPTION: main

02-14 20:28:49.037: E/AndroidRuntime(383): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.droid.droidplayer/com.droid.droidplayer.Player}: java.lang.NullPointerException

02-14 20:28:49.037: E/AndroidRuntime(383): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)

02-14 20:28:49.037: E/AndroidRuntime(383): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)

02-14 20:28:49.037: E/AndroidRuntime(383): at android.app.ActivityThread.access$500(ActivityThread.java:122)

02-14 20:28:49.037: E/AndroidRuntime(383): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)

02-14 20:28:49.037: E/AndroidRuntime(383): at android.os.Handler.dispatchMessage(Handler.java:99)

02-14 20:28:49.037: E/AndroidRuntime(383): at android.os.Looper.loop(Looper.java:132)

02-14 20:28:49.037: E/AndroidRuntime(383): at android.app.ActivityThread.main(ActivityThread.java:4123)

02-14 20:28:49.037: E/AndroidRuntime(383): at java.lang.reflect.Method.invokeNative(Native Method)

02-14 20:28:49.037: E/AndroidRuntime(383): at java.lang.reflect.Method.invoke(Method.java:491)

02-14 20:28:49.037: E/AndroidRuntime(383): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)

02-14 20:28:49.037: E/AndroidRuntime(383): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)

02-14 20:28:49.037: E/AndroidRuntime(383): at dalvik.system.NativeStart.main(Native Method)

02-14 20:28:49.037: E/AndroidRuntime(383): Caused by: java.lang.NullPointerException

02-14 20:28:49.037: E/AndroidRuntime(383): at com.droid.droidplayer.SongsManager.getPlayList(SongsManager.java:25)

02-14 20:28:49.037: E/AndroidRuntime(383): at com.droid.droidplayer.Player.onCreate(Player.java:76)

02-14 20:28:49.037: E/AndroidRuntime(383): at android.app.Activity.performCreate(Activity.java:4397)

02-14 20:28:49.037: E/AndroidRuntime(383): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)

02-14 20:28:49.037: E/AndroidRuntime(383): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)

02-14 20:28:49.037: E/AndroidRuntime(383): ... 11 more

02-14 20:29:27.166: I/Process(383): Sending signal. PID: 383 SIG: 9

Justin Breitfeller
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vishalkin
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2 Answers2

0

An object at line 25 of your SongsManager is null.

Justin Breitfeller
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0
  1. package com.droid.droidplayer;

  3. import java.io.File;
  4. import java.io.FilenameFilter;
  5. import java.util.ArrayList;
  6. import java.util.HashMap;

  8. public class SongsManager {
  9. // SDCard Path
  10. final String MEDIA_PATH = new String("/sdcard/");
  11. private ArrayList> songsList = new ArrayList>();

  13. // Constructor
  14. public SongsManager(){

  16. }





  22. public ArrayList> getPlayList(){
  23. File home = new File(MEDIA_PATH);

  25. if (home.listFiles(new FileExtensionFilter()).length > 0) {
  26. for (File file : home.listFiles(new FileExtensionFilter())) {
  27. HashMap song = new HashMap();
  28. song.put("songTitle", file.getName().substring(0 (file.getName().length() - 4)));
  29. song.put("songPath", file.getPath());

  31. // Adding each song to SongList
  32. songsList.add(song);
  33. }
  34. }
  35. // return songs list array
  36. return songsList;
  37. }




  42. class FileExtensionFilter implements FilenameFilter {
  43. public boolean accept(File dir, String name) {
  44. return (name.endsWith(".mp3") || name.endsWith(".MP3"));
  45. }
  46. }
  47. }
vishalkin
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