java.lang.NullPointerException: Attempt to invoke virtual method 'int com.github.derlio.waveform.soundfile.SoundFile.getSampleRate()' on a null object reference #3
Description
I get this error
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.studiosoapps.studioso, PID: 18253
java.lang.NullPointerException: Attempt to invoke virtual method 'int com.github.derlio.waveform.soundfile.SoundFile.getSampleRate()' on a null object reference
at com.github.derlio.waveform.SimpleWaveformView.setAudioFile(SimpleWaveformView.java:74)
at com.studiosoapps.studioso.recordings.RecordedAudioListener$9$2.run(RecordedAudioListener.java:355)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
this is my code
package com.studiosoapps.studioso.recordings;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Environment;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.Toast;
import com.github.derlio.waveform.SimpleWaveformView;
import com.github.derlio.waveform.soundfile.SoundFile;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.storage.FileDownloadTask;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.studiosoapps.studioso.R;
import java.io.File;
import java.io.IOException;
import static com.crashlytics.android.Crashlytics.TAG;
public class RecordedAudioListener extends AppCompatActivity implements MediaPlayer.OnPreparedListener, SimpleWaveformView.WaveformListener {
// public static ArrayList<Object> urlName = new ArrayList<>();
public static String fileName;
public static String urlName;
public static String urlNameOrg;
public static String urlNameNew;
private SimpleWaveformView mWaveformView;
private Button buttonPlayStop;
private SeekBar seekBar;
// private static final String TAG = "RecordedAudioListener";
private MediaPlayer mediaPlayer;
//path to the audio file
private String mediaFile;
FirebaseStorage storage = FirebaseStorage.getInstance();
String UID = FirebaseAuth.getInstance().getUid();
//https://www.sitepoint.com/a-step-by-step-guide-to-building-an-android-audio-player-app/
private final Handler handler = new Handler();
// Here i override onCreate method.
//
// setContentView() method set the layout that you will see then
// the application will starts
//
// initViews() method i create to init views components.
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recorded_audio_listener);
//https://www.hrupin.com/2010/12/simple-android-mp3-media-player/comment-page-1
urlNameOrg = RecordedAudioViewer.urlReturn();
fileName = RecordedAudioViewer.nameReturn();
Log.d(TAG, "onCreate: urlNameOrg " + urlNameOrg);
// urlNameOrg = urlNameOrg.substring(0, urlNameOrg.indexOf("=") - 1);
urlNameNew = urlNameOrg.replace("{DownloadURL=","");
urlName = urlNameNew.replace("}","");
Log.d(TAG, "onCreate: urlName " + urlName);
Log.d(TAG, "onCreate: urlNameOrg new " + urlNameOrg);
Log.d(TAG, "onCreate: fileName "+ fileName);
StorageReference httpsReference = storage.getReferenceFromUrl(String.valueOf(urlName));
// File localFile = null;
// try {
// localFile = File.createTempFile("videos", "mp4");
// } catch (IOException e) {
// e.printStackTrace();
// }
File directory = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "Studioso");
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "Studioso" + "/" + fileName);
Log.d(TAG, "createDir: Dir == " + directory);
Log.d(TAG, "createDir: file dir == " + file);
if (!directory.exists() || !directory.isDirectory()) {
directory.mkdirs();
Toast.makeText(RecordedAudioListener.this, "Media file not ready", Toast.LENGTH_SHORT).show();
Log.d(TAG, "createDir: making directory");
// if ( buttonPlayStop != null ) buttonPlayStop.setEnabled(false);
httpsReference.getFile(directory).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
@Override
public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
// Local temp file has been created
Log.d(TAG, "createDir: Downloading files complete");
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
// Handle any errors
Log.d(TAG, "createDir: Downloading files failure");
}
});
}
else if (directory.exists() && !file.exists() ) {
// if ( buttonPlayStop != null ) buttonPlayStop.setEnabled(false);
Toast.makeText(RecordedAudioListener.this, "Media file not ready", Toast.LENGTH_SHORT).show();
Log.d(TAG, "createDir: Downloading files");
httpsReference.getFile(directory).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
@Override
public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
// Local temp file has been created
Log.d(TAG, "createDir: Downloading files complete");
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
// Handle any errors
Log.d(TAG, "createDir: Downloading files failure");
}
});
}
else {
Log.d(TAG, "createDir: files are there");
Toast.makeText(RecordedAudioListener.this, "Media file not ready", Toast.LENGTH_SHORT).show();
// if ( buttonPlayStop != null ) buttonPlayStop.setEnabled(false);
}
mediaFile = directory + "/" + fileName;
initViews();
mWaveformView = (SimpleWaveformView) findViewById(R.id.waveform);
mWaveformView.setWaveformListener(this);
}
// This method set the setOnClickListener and method for it (buttonClick())
private void initViews() {
// buttonPlayStop.setOnClickListener(new View.OnClickListener() {@Override public void onClick(View v) {buttonClick();}});
// mediaPlayer = MediaPlayer.create(this, Uri.parse(mediaFile));
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource(mediaFile);
// mediaPlayer.setDataSource(getApplication(),Uri.parse(mediaFile));
// mediaPlayer.setOnPreparedListener(this);
mediaPlayer.setOnPreparedListener(this);
mediaPlayer.prepareAsync();
Log.d(TAG, "initViews: mediaPlayer input file set " + mediaFile);
} catch (IOException e) {
e.printStackTrace();
}
// seekBar.setMax(mediaPlayer.getDuration());
// seekBar.setOnTouchListener(new View.OnTouchListener() {
// @Override
// public boolean onTouch(View v, MotionEvent event) {
// seekChange(v);
// return false;
// }
// });
}
//
// public void startPlayProgressUpdater() {
//
// seekBar.setProgress(mediaPlayer.getCurrentPosition());
// if (mediaPlayer.isPlaying()) {
//
// Runnable notification = new Runnable() {
// public void run() {
// startPlayProgressUpdater();
// }
// };
//// handler.postDelayed(notification, 1000);
// } else {
// if (mediaPlayer != null) {
// mediaPlayer.pause();
// }
//// buttonPlayStop.setText("Play");
//// seekBar.setProgress(0);
// }
//
// }
// This is event handler thumb moving event
private void seekChange(View v){
if(mediaPlayer.isPlaying()){
SeekBar sb = (SeekBar)v;
mediaPlayer.seekTo(sb.getProgress());
}
}
// This is event handler for buttonClick event
private void buttonClick(){
if (buttonPlayStop.getText() == "Play") {
buttonPlayStop.setText("Pause");
try{
mediaPlayer.start();
// startPlayProgressUpdater();
updateSeek();
Log.d(TAG, "buttonClick: mediaPlayer Started sucessfully");
}catch (IllegalStateException e) {
mediaPlayer.pause();
Log.d(TAG, "buttonClick: mediaPlayer failed IllegalStatus ");
}
}else {
mediaPlayer.pause();
buttonPlayStop.setText("Play");
}
}
@Override
public void onPrepared(MediaPlayer mp) {
// Do something. For example: playButton.setEnabled(true);
// buttonPlayStop.setEnabled(true);
buttonPlayStop = (Button) findViewById(R.id.ButtonPlayStop);
buttonPlayStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
buttonClick();
}
});
buttonPlayStop.setText("Play");
// mediaPlayer.start();
doTheWave();
Toast.makeText(RecordedAudioListener.this, "Media file downloaded and ready to play", Toast.LENGTH_LONG).show();
Log.d(TAG, "mediaPlayer: mediaPlayer ready");
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
}
});
new Thread(new Runnable() {
public void run() {
seekBar = (SeekBar) findViewById(R.id.SeekBar01);
seekBar.setMax(mediaPlayer.getDuration());
seekBar.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
seekChange(v);
return false;
}
});
}
}).start();
}
@Override
public void onDestroy() {
super.onDestroy();
if (mediaPlayer != null) {
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
}
}
private void updateSeek() {
new Thread(new Runnable() {
public void run() {
Log.d(TAG, "updateSeek: while loop will run"); //note this isn't in loop because of performance
while (mediaPlayer.isPlaying()) {
seekBar.setProgress(mediaPlayer.getCurrentPosition());
if (!mediaPlayer.isPlaying()) {
break;
}
}
}
}).start();
}
@Override
public void onWaveformDraw() {
if (mediaPlayer.isPlaying()) {
updateDisplay();
}
}
private synchronized void updateDisplay() {
if (mediaPlayer.isPlaying() && mediaPlayer != null) {
int now = mediaPlayer.getCurrentPosition();
mWaveformView.setPlaybackPosition(now);
}
//
// mWaveformView.setParameters(mStartPos, mEndPos, mOffset);
// mWaveformView.invalidate();
}
private void doTheWave() {
new Thread(new Runnable() {
public void run() {
try {
File dir = Environment.getExternalStorageDirectory();
final File withDir = new File(dir, "Studioso");
final File file = new File(withDir, fileName);
final SoundFile soundFile = SoundFile.create(file.getPath(), new SoundFile.ProgressListener() {
int lastProgress = 0;
@Override
public boolean reportProgress(double fractionComplete) {
final int progress = (int) (fractionComplete * 100);
if (lastProgress == progress) {
return true;
}
lastProgress = progress;
Log.i(TAG, "LOAD FILE PROGRESS:" + progress);
return true;
}
});
runOnUiThread(new Runnable() {
@Override
public void run() {
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
mWaveformView.setAudioFile(soundFile);
// mWaveformView.invalidate();
}
});
} catch (IOException e) {
e.printStackTrace();
} catch (SoundFile.InvalidInputException e) {
e.printStackTrace();
}
}
}).start();
}
}
any advice I don't know why this error is happening?