Android null pointer exception on findviewbyid

hi im currently working on my android mediaplayer project , everything was fine but then i changed the layout design and now i get java.nullpointerexception everytime i launch, i've searched for answers everwhere but all i've done doesn't work... anyone can help me pls ? Here the layout.xml ``` <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/RelativeLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#000000" android:orientation="vertical" > <SeekBar android:id="@+id/sbSong" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_marginBottom="72dp" /> <ImageButton android:id="@+id/btnNext" android:contentDescription="@string/Next" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:src="@drawable/next" /> <ImageButton android:id="@+id/btnBack" android:contentDescription="@string/Previous" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:src="@drawable/previous" /> <ImageButton android:id="@+id/btnPlay" android:contentDescription="@string/btnPlay" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:src="@drawable/play" /> <ImageButton android:id="@+id/btnShuffle" android:contentDescription="@string/shuffleOn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/sbSong" android:layout_alignParentRight="true" android:src="@drawable/shuffle_off" /> <ImageButton android:id="@+id/btnRepeat" android:contentDescription="@string/repeatOn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/sbSong" android:layout_alignParentLeft="true" android:src="@drawable/repeat_off" /> <TextView android:id="@+id/txtDuration" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/btnShuffle" android:layout_toLeftOf="@+id/btnShuffle" android:text="TextView" /> <TextView android:id="@+id/txtCurrentPosition" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/btnRepeat" android:layout_toRightOf="@+id/btnRepeat" android:text="TextView" /> <ImageView android:id="@+id/AlbumArtwork" android:contentDescription="@string/noSong" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/btnShuffle" android:layout_centerHorizontal="true" android:layout_marginBottom="66dp" android:src="@drawable/noartwork" /> <TextView android:id="@+id/txtSongTitle" android:layout_width="wrap_content" android:layout_height="40dp" android:layout_alignParentLeft="true" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:text="Medium Text" android:textAppearance="?android:attr/textAppearanceMedium" /> <ImageButton android:id="@+id/btnPlaylist" android:contentDescription="@string/SongList" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:src="@drawable/dropdown" /> <ListView android:id="@+id/lstSongs" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:visibility="invisible" android:layout_below="@+id/txtSongTitle" > </ListView> <EditText android:id="@+id/searchbox" android:visibility="invisible" android:layout_height="wrap_content" android:layout_width="match_parent" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:layout_toRightOf="@+id/btnPlaylist" android:ems="10" > <requestFocus /> </EditText> </RelativeLayout> ``` -and the .java package com.example.player; ``` import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.HashMap; import java.util.Random; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; import com.example.player.R; import android.media.MediaMetadataRetriever; import android.media.MediaPlayer; import android.media.MediaPlayer.OnCompletionListener; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.provider.MediaStore; import android.annotation.SuppressLint; import android.annotation.TargetApi; import android.app.Activity; import android.content.pm.ActivityInfo; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.text.Editable; import android.text.TextWatcher; import android.util.Log; import android.view.Menu; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnTouchListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.EditText; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SeekBar; import android.widget.SimpleAdapter; import android.widget.TextView; public class MainActivity extends Activity implements OnCompletionListener { //Declaration de variable globale //button private ImageButton btnPlayPause; private ImageButton btnShuffle; private ImageButton btnRepeat; private ImageButton btnNext; private ImageButton btnBack; private ImageButton btnSongList; private SeekBar songBar; private TextView txtTitle; private TextView txtCurrentTime; private TextView txtDuration; private ListView lstSongs; private ImageView cover; private EditText searchbox; //Variable private boolean isShuffle = false; private boolean isRepeat = false; private boolean isVisible = false; private String minutes = ""; private String seconds = ""; private int textlength = 0; private ArrayList<HashMap<String,String>> songs_sort = new ArrayList<HashMap<String,String>>(); @SuppressLint("SdCardPath") private String SDCARD ="/sdcard/"; //MediaPlayer private MediaPlayer mp; private int songIndex = 0; //Songs public ArrayList<HashMap<String, String>> songs = new ArrayList<HashMap<String, String>>(); //Handler de la seekbar private final Handler handler = new Handler(); //Au load de l'Activity @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initialise(); } private void initialise() { //MediaPlayer mp = new MediaPlayer(); //Dont Move Screen setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); //findViewById btnPlayPause = (ImageButton) findViewById(R.id.btnPlay); btnShuffle = (ImageButton) findViewById(R.id.btnShuffle); btnRepeat = (ImageButton) findViewById(R.id.btnRepeat); btnNext = (ImageButton) findViewById(R.id.btnNext); btnBack = (ImageButton) findViewById(R.id.btnBack); txtTitle = (TextView) findViewById(R.id.txtSongTitle); txtCurrentTime = (TextView) findViewById(R.id.txtCurrentPosition); txtDuration = (TextView) findViewById(R.id.txtDuration); lstSongs = (ListView) findViewById(R.id.lstSongs); songBar = (SeekBar) findViewById(R.id.sbSong); cover = (ImageView) findViewById(R.id.AlbumArtwork); searchbox = (EditText) findViewById(R.id.searchbox); //set les Listener btnPlayPause.setOnClickListener(new OnClickListener() {@Override public void onClick(View v) {playPause();}}); btnShuffle.setOnClickListener(new OnClickListener() {@Override public void onClick(View v) {shuffle();}}); btnRepeat.setOnClickListener(new OnClickListener() {@Override public void onClick(View v) {repeat();}}); btnNext.setOnClickListener(new OnClickListener(){@Override public void onClick(View v) {next();}}); btnBack.setOnClickListener(new OnClickListener(){@Override public void onClick(View v) {back();}}); btnSongList.setOnClickListener(new OnClickListener(){@Override public void onClick(View v) {visible();}}); searchbox.addTextChangedListener(new TextWatcher(){ public void afterTextChanged(Editable et) { } @Override public void beforeTextChanged(CharSequence chars, int start, int count, int after) { // TODO Auto-generated method stub } @Override public void onTextChanged(CharSequence chars, int start, int count,int after) { // TODO Auto-generated method stub textlength = searchbox.getText().length(); if(textlength > 0) { songs_sort.clear(); for(int i = 0; i < songs.size();i++) { if(textlength < songs.get(i).get("songTitle").length()) { if(searchbox.getText().toString().equalsIgnoreCase((String) songs.get(i).get("songTitle").subSequence(0, textlength))) { songs_sort.add(songs.get(i)); } } } adapt(songs_sort); } else { createPlaylist(SDCARD); } } }); mp.setOnCompletionListener(this); songBar.setOnTouchListener(new OnTouchListener() {@Override public boolean onTouch(View v, MotionEvent event) { seekChange(v); return false; } }); //la playlist createPlaylist(SDCARD); } //rempli la listview avec les titres de chansons private void createPlaylist(String dir) { songs.clear(); /*Aller chercher TOUTES les chansons de la sdcard * grâce a un cursor et une db * la db Mediastore est créer par android pour * stocker tout les informations sur les fichiers de la sdcard * je pousse le resultat de ma requete dans mon array de chansons * avec un while */ String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0"; String[] projection = { MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media.DATA }; @SuppressWarnings("deprecation") Cursor cursor = this.managedQuery( MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, projection, selection, null, null); while(cursor.moveToNext()){ HashMap<String,String> song = new HashMap<String,String>(); song.put("songTitle",cursor.getString(0)+"-"+cursor.getString(1)); song.put("songPath",cursor.getString(2) ); songs.add(song); } //j'utilisais ceci avant pour aller chercher les chansons par une boucle de fichier /* File root = new File(dir); //loop a travers la carte sd Note: listFiles() n'entre pas dans les folders if(root.listFiles().length > 0) { for(File file : root.listFiles()) { //if(file.isDirectory()) //{ //}else //{ if(file.toString().endsWith(".mp3")) { HashMap<String, String> song = new HashMap<String, String>(); song.put("songTitle", file.getName().substring(0, (file.getName().length() - 4))); song.put("songPath", file.getPath()); songs.add(song); } //} } }*/ //lier avec adapter adapt(songs); } private void adapt(ArrayList<HashMap<String,String>> array) { //sort le arraylist Collections.sort(array, new Comparator<HashMap<String,String>>() { @Override public int compare(HashMap<String, String> lhs, HashMap<String, String> rhs) { // TODO Auto-generated method stub return lhs.get("songTitle").compareToIgnoreCase(rhs.get("songTitle")); } }); //Lier le array au listview comme data ListAdapter adapter = new SimpleAdapter(this, array,R.layout.song_item, new String[] { "songTitle" }, new int[] {R.id.song }); lstSongs.setAdapter(adapter); lstSongs.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub playthis(position); } }); } //joue la chanson a l'index selectionner private void playthis(int position) { songIndex = position; String path = songs.get(songIndex).get("songPath"); Log.w("PLAYER","song path = "+ path); try { mp.reset(); mp.setDataSource(path); mp.prepare(); songBar.setMax(mp.getDuration()); btnPlayPause.setImageResource(R.drawable.pause); txtTitle.setText(songs.get(songIndex).get("songTitle")); txtCurrentTime.setText("0:00"); mp.start(); timer(); progressBar(); getCover(path); } catch (Exception e) { // TODO: handle exception } } //Function PlayPause Button private void playPause() { if(mp.isPlaying()){ if(mp!=null){ mp.pause(); // je change l'image du boutton btnPlayPause.setImageResource(R.drawable.play); } }else{ // repartir la chanson if(mp!=null){ mp.start(); // je change l'image du boutton btnPlayPause.setImageResource(R.drawable.pause); } } } //Function next la chanson private void next() { if(isShuffle) { //sort une chanson random Random rand = new Random(); songIndex = rand.nextInt(songs.size()-1); playthis(songIndex); } else { //check si la chanson qui vient d'être jouer est la derniere de la liste if(songIndex < songs.size()-1) { songIndex = songIndex + 1; playthis(songIndex); } else { //repart avec la premiere chanson playthis(0); } } } //Function back() lit la chanson précédente ou une autre random private void back() { if(isShuffle) { //sort une chanson random Random rand = new Random(); songIndex = rand.nextInt(songs.size()-1); playthis(songIndex); } else { //check si la chanson qui vient d'être jouer est la premiere de la liste if(songIndex > 0) { songIndex = songIndex - 1; playthis(songIndex); } else { //joue la derniere chanson playthis(songs.size()-1); } } } //Function timer pour le current time of the song private void timer() { //Duration de la chanson minutes = String.valueOf(mp.getDuration()/60000); seconds = String.valueOf(mp.getDuration() % 60000); seconds = seconds.substring(0, 2); txtDuration.setText(minutes+":"+seconds); ScheduledExecutorService myShedule = Executors.newScheduledThreadPool(1); myShedule.scheduleWithFixedDelay( new Runnable(){ @Override public void run() { monitorHandler.sendMessage(monitorHandler.obtainMessage()); }}, 200, //initialDelay 200, //delay TimeUnit.MILLISECONDS); } Handler monitorHandler = new Handler(){ @Override public void handleMessage(Message msg) { mediacurrentposition(); } }; //Function mediacurrentposition private void mediacurrentposition() { if(mp.isPlaying()) { minutes = String.valueOf(mp.getCurrentPosition()/60000); seconds = String.valueOf(mp.getCurrentPosition() % 60000); //seconds = seconds.substring(0, 2); /*if(Integer.getInteger(seconds) < 10) { seconds = "0"+seconds ; }*/ txtCurrentTime.setText(minutes+":"+seconds); } } //Function seekbar qui suis la chanson private void progressBar() { songBar.setProgress(mp.getCurrentPosition()); if (mp.isPlaying()) { Runnable notification = new Runnable() { public void run() { progressBar(); } }; handler.postDelayed(notification,1000); }else{ mp.pause(); btnPlayPause.setImageResource(R.drawable.play); songBar.setProgress(mp.getCurrentPosition()); } } //partir la chanson ou la seekbar est private void seekChange(View v) { SeekBar sb = (SeekBar)v; if(mp.isPlaying()){ mp.seekTo(sb.getProgress()); } else { mp.seekTo(sb.getProgress()); } timer(); } private void shuffle() { if(isShuffle) { isShuffle = false; btnShuffle.setImageResource(R.drawable.shuffle_off); }else{ isShuffle = true; btnShuffle.setImageResource(R.drawable.shuffle_on); } } private void repeat() { if(isRepeat) { isRepeat = false; btnRepeat.setImageResource(R.drawable.repeat_off); }else{ isRepeat = true; btnRepeat.setImageResource(R.drawable.repeat_on); } } @Override public void onCompletion(MediaPlayer arg0) { if(isRepeat) { //joue la même chanson sur repeat playthis(songIndex); } else if(isShuffle) { //sort une chanson random Random rand = new Random(); songIndex = rand.nextInt(songs.size()-1); playthis(songIndex); } else { //la prochaine chanson suivant la chanson qui vient d'être jouer //check si la chanson qui vient d'être jouer est la derniere de la liste if(songIndex < songs.size()-1) { songIndex = songIndex + 1; playthis(songIndex); } else { //repart avec la premiere chanson playthis(0); } } } private void visible() { if(isVisible) { lstSongs.setVisibility(View.INVISIBLE); searchbox.setVisibility(View.INVISIBLE); isVisible = false; cover.setVisibility(View.VISIBLE); txtCurrentTime.setVisibility(View.VISIBLE); txtDuration.setVisibility(View.VISIBLE); } else { lstSongs.setVisibility(View.VISIBLE); searchbox.setVisibility(View.VISIBLE); isVisible = true; cover.setVisibility(View.INVISIBLE); txtCurrentTime.setVisibility(View.INVISIBLE); txtDuration.setVisibility(View.INVISIBLE); } } @TargetApi(10) @SuppressLint({ "NewApi", "NewApi", "NewApi" }) private void getCover(String path) { MediaMetadataRetriever metaDataRetriver = new MediaMetadataRetriever(); metaDataRetriver.setDataSource(path); byte[] pic; pic = metaDataRetriver.getEmbeddedPicture(); if(pic == null) { cover.setImageResource(R.drawable.noartwork); } else { Bitmap bMap; bMap = BitmapFactory.decodeByteArray(pic, 0, pic.length); cover.setImageBitmap(bMap); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } } ``` -The Logcat ``` 11-30 11:06:28.989: D/AndroidRuntime(15673): Shutting down VM 11-30 11:06:28.989: W/dalvikvm(15673): threadid=1: thread exiting with uncaught exception (group=0x40018578) 11-30 11:06:28.999: E/AndroidRuntime(15673): FATAL EXCEPTION: main 11-30 11:06:28.999: E/AndroidRuntime(15673): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.player/com.example.player.MainActivity}: java.lang.NullPointerException 11-30 11:06:28.999: E/AndroidRuntime(15673): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651) 11-30 11:06:28.999: E/AndroidRuntime(15673): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 11-30 11:06:28.999: E/AndroidRuntime(15673): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 11-30 11:06:28.999: E/AndroidRuntime(15673): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 11-30 11:06:28.999: E/AndroidRuntime(15673): at android.os.Handler.dispatchMessage(Handler.java:99) 11-30 11:06:28.999: E/AndroidRuntime(15673): at android.os.Looper.loop(Looper.java:130) 11-30 11:06:28.999: E/AndroidRuntime(15673): at android.app.ActivityThread.main(ActivityThread.java:3687) 11-30 11:06:28.999: E/AndroidRuntime(15673): at java.lang.reflect.Method.invokeNative(Native Method) 11-30 11:06:28.999: E/AndroidRuntime(15673): at java.lang.reflect.Method.invoke(Method.java:507) 11-30 11:06:28.999: E/AndroidRuntime(15673): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 11-30 11:06:28.999: E/AndroidRuntime(15673): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 11-30 11:06:28.999: E/AndroidRuntime(15673): at dalvik.system.NativeStart.main(Native Method) 11-30 11:06:28.999: E/AndroidRuntime(15673): Caused by: java.lang.NullPointerException 11-30 11:06:28.999: E/AndroidRuntime(15673): at com.example.player.MainActivity.initialise(MainActivity.java:117) 11-30 11:06:28.999: E/AndroidRuntime(15673): at com.example.player.MainActivity.onCreate(MainActivity.java:88) 11-30 11:06:28.999: E/AndroidRuntime(15673): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 11-30 11:06:28.999: E/AndroidRuntime(15673): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615) 11-30 11:06:28.999: E/AndroidRuntime(15673): ... 11 more ``` Okay i know it's a lot of code ... I've been working on that project since a 2 months for my final project at school but now i'm stuck with that error