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Invalid Static Exception in android

I wrote down the sound recording code from http://developer.android.com/guide/topics/media/index.html , after running it on my emulator, it throws an illegal StateException, I also tried on my device, but the same thing there.

I'm new to android, help me

package com.android.audiorecordtest; import android.app.Activity; import android.widget.LinearLayout; import android.os.Bundle; import android.os.Environment; import android.view.ViewGroup; import android.widget.Button; import android.view.View; import android.view.View.OnClickListener; import android.content.Context; import android.util.Log; import android.media.MediaRecorder; import android.media.MediaPlayer; import java.io.IOException; public class AudioRecordTest extends Activity { private static final String LOG_TAG = "AudioRecordTest"; private static String mFileName = null; private RecordButton mRecordButton = null; private MediaRecorder mRecorder = null; private PlayButton mPlayButton = null; private MediaPlayer mPlayer = null; private void onRecord(boolean start) { if (start) { startRecording(); } else { stopRecording(); } } private void onPlay(boolean start) { if (start) { startPlaying(); } else { stopPlaying(); } } private void startPlaying() { mPlayer = new MediaPlayer(); try { mPlayer.setDataSource(mFileName); mPlayer.prepare(); mPlayer.start(); } catch (IOException e) { Log.e(LOG_TAG, "prepare() failed"); } } private void stopPlaying() { mPlayer.release(); mPlayer = null; } private void startRecording() { mRecorder = new MediaRecorder(); mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mRecorder.setOutputFile(mFileName); mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); try { mRecorder.prepare(); } catch (IOException e) { Log.e(LOG_TAG, "prepare() failed"); } mRecorder.start(); } private void stopRecording() { mRecorder.stop(); mRecorder.release(); mRecorder = null; } class RecordButton extends Button { boolean mStartRecording = true; OnClickListener clicker = new OnClickListener() { public void onClick(View v) { onRecord(mStartRecording); if (mStartRecording) { setText("Stop recording"); } else { setText("Start recording"); } mStartRecording = !mStartRecording; } }; public RecordButton(Context ctx) { super(ctx); setText("Start recording"); setOnClickListener(clicker); } } class PlayButton extends Button { boolean mStartPlaying = true; OnClickListener clicker = new OnClickListener() { public void onClick(View v) { onPlay(mStartPlaying); if (mStartPlaying) { setText("Stop playing"); } else { setText("Start playing"); } mStartPlaying = !mStartPlaying; } }; public PlayButton(Context ctx) { super(ctx); setText("Start playing"); setOnClickListener(clicker); } } public AudioRecordTest() { mFileName = Environment.getExternalStorageDirectory().getAbsolutePath(); mFileName += "/audiorecordtest.3gp"; } @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); LinearLayout ll = new LinearLayout(this); mRecordButton = new RecordButton(this); ll.addView(mRecordButton, new LinearLayout.LayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 0)); mPlayButton = new PlayButton(this); ll.addView(mPlayButton, new LinearLayout.LayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 0)); setContentView(ll); } @Override public void onPause() { super.onPause(); if (mRecorder != null) { mRecorder.release(); mRecorder = null; } if (mPlayer != null) { mPlayer.release(); mPlayer = null; } } }

Stack trace:

 > 06-01 11:06:18.440: > ERROR/AndroidRuntime(724): Uncaught > handler: thread main exiting due to > uncaught exception 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): > java.lang.IllegalStateException 06-01 > 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.media.MediaRecorder.start(Native > Method) 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > com.example.android.whereareyou.Main.startRecording(Main.java:75) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > com.example.android.whereareyou.Main.onRecord(Main.java:32) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > com.example.android.whereareyou.Main.access$0(Main.java:30) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > com.example.android.whereareyou.Main$RecordButton$1.onClick(Main.java:89) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.view.View.performClick(View.java:2179) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.view.View.onTouchEvent(View.java:3828) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.widget.TextView.onTouchEvent(TextView.java:6291) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.view.View.dispatchTouchEvent(View.java:3368) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1707) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1197) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.app.Activity.dispatchTouchEvent(Activity.java:1993) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1691) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.view.ViewRoot.handleMessage(ViewRoot.java:1525) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.os.Handler.dispatchMessage(Handler.java:99) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.os.Looper.loop(Looper.java:123) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > android.app.ActivityThread.main(ActivityThread.java:3948) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > java.lang.reflect.Method.invokeNative(Native > Method) 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > java.lang.reflect.Method.invoke(Method.java:521) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540) > 06-01 11:06:18.449: > ERROR/AndroidRuntime(724): at > dalvik.system.NativeStart.main(Native > Method)
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2 answers

Try using this: -

 public class VoiceRecorder extends Activity { /** Called when the activity is first created. */ private MediaRecorder mediaRecorder; boolean recording= false; private Button start; //Start Button to start the recordings private Button stop; // Stop button to stop the recordings @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.voice_recorder); mediaRecorder = new MediaRecorder(); start = (Button)findViewById(R.id.start); //Activity when user click the start Button start.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub settings(); recordPrepare(); mediaRecorder.start(); recording = true; } }); //Activity when user click the stop Button stop = (Button)findViewById(R.id.stop); stop.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub if(recording) { mediaRecorder.stop(); mediaRecorder.release(); recording = false; settings(); recordPrepare(); } } }); } //Settings for Audio Recorder private void settings() { long name = new Date().getTime(); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT); mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); mediaRecorder.setOutputFile("/sdcard/"+Long.toString(name)+".3gp"); DataModel dbModel = new DataModel(this); Calendar cal = Calendar.getInstance(); dbModel.insertMultimedia("/sdcard/"+Long.toString(name)+".3gp", Long.toString(name), cal); } //prepare the Environment for Recording private void recordPrepare() { try { mediaRecorder.prepare(); } catch(IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }

}

This will work fine. and the file will be saved on the SD card. You can also play using the play method as you used in your code.

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The problem in the code presented is that the name of the file name in which you write (mFileName) is null.

You can simply call AudioRecordTest() before calling the mRecorder.setOutputFile(mFileName) on startRecording() method. That should work. At least that was for me.

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