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POCrash while recording media in Android app
 

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    <p>I'm just starting off and I'm using the developers tutorials. I've modified the recording code as below, but I am getting an error and I'm not sure. I don't have an in depth level of Java, and I'm only really about 3 weeks into Objects and Classes. This app is for a project, for which we have no spec.</p> <pre><code>private static final String LOG_TAG = "Recording"; //start recording stuff private RecordButton mRecordButton = null; private MediaRecorder mRecorder = null; private void onRecord(boolean start) { if (start) startRecording(); else stopRecording(); } private void startRecording() { mRecorder = new MediaRecorder(); mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mRecorder.setOutputFile("/sdCard0/panic_record/" + System.currentTimeMillis()+ ".3gp"); 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); } } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_record); getActionBar().setDisplayHomeAsUpEnabled(true); LinearLayout ll = new LinearLayout(this); mRecordButton = new RecordButton(this); ll.addView(mRecordButton, new LinearLayout.LayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 0)); setContentView(ll); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_record, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: NavUtils.navigateUpFromSameTask(this); return true; } return super.onOptionsItemSelected(item); } </code></pre> <p>LogCat output is</p> <pre> 09-26 20:05:37.620: E/Recording(1152): prepare() failed 09-26 20:05:37.620: E/MediaRecorder(1152): start called in an invalid state: 4 09-26 20:05:37.620: D/AndroidRuntime(1152): Shutting down VM 09-26 20:05:37.620: W/dalvikvm(1152): threadid=1: thread exiting with uncaught exception (group=0x41c18300) 09-26 20:05:37.630: E/AndroidRuntime(1152): FATAL EXCEPTION: main 09-26 20:05:37.630: E/AndroidRuntime(1152): java.lang.IllegalStateException 09-26 20:05:37.630: E/AndroidRuntime(1152): at android.media.MediaRecorder.start(Native Method) 09-26 20:05:37.630: E/AndroidRuntime(1152): at cs4084.panic.button.Record.startRecording(Record.java:55) 09-26 20:05:37.630: E/AndroidRuntime(1152): at cs4084.panic.button.Record.onRecord(Record.java:34) 09-26 20:05:37.630: E/AndroidRuntime(1152): at cs4084.panic.button.Record.access$0(Record.java:31) 09-26 20:05:37.630: E/AndroidRuntime(1152): at cs4084.panic.button.Record$RecordButton$1.onClick(Record.java:71) 09-26 20:05:37.630: E/AndroidRuntime(1152): at android.view.View.performClick(View.java:4211) 09-26 20:05:37.630: E/AndroidRuntime(1152): at android.view.View$PerformClick.run(View.java:17267) 09-26 20:05:37.630: E/AndroidRuntime(1152): at android.os.Handler.handleCallback(Handler.java:615) 09-26 20:05:37.630: E/AndroidRuntime(1152): at android.os.Handler.dispatchMessage(Handler.java:92) 09-26 20:05:37.630: E/AndroidRuntime(1152): at android.os.Looper.loop(Looper.java:137) 09-26 20:05:37.630: E/AndroidRuntime(1152): at android.app.ActivityThread.main(ActivityThread.java:4898) 09-26 20:05:37.630: E/AndroidRuntime(1152): at java.lang.reflect.Method.invokeNative(Native Method) 09-26 20:05:37.630: E/AndroidRuntime(1152): at java.lang.reflect.Method.invoke(Method.java:511) 09-26 20:05:37.630: E/AndroidRuntime(1152): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 09-26 20:05:37.630: E/AndroidRuntime(1152): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 09-26 20:05:37.630: E/AndroidRuntime(1152): at dalvik.system.NativeStart.main(Native Method) </pre>
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