イタリックテキスト```public class MainActivity extends Activity {
private static final String TAG = "AR";
private int RECORDER_BPP;
private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".wav";
private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw";
private int RECORDER_SAMPLERATE;
private AudioRecord recorder = null;
private int bufferSize = 0;
private Thread recordingThread = null;
private boolean isRecording = false;
final int[] sampleRates = new int[] {44100, 22050, 11025, 8000};
final short[] audioFormats = new short[] {AudioFormat.ENCODING_PCM_16BIT, AudioFormat.ENCODING_PCM_8BIT};
final short[] channelConfigs = new short[] {AudioFormat.CHANNEL_IN_STEREO, AudioFormat.CHANNEL_IN_MONO};
@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); recorder = findAudioRecord(); setButtonHandlers(); enableButtons(false); } private void setButtonHandlers() { ((Button)findViewById(R.id.btnStart)).setOnClickListener(btnClick); ((Button)findViewById(R.id.btnStop)).setOnClickListener(btnClick); } private void enableButton(int id,boolean isEnable){ ((Button)findViewById(id)).setEnabled(isEnable); } private void enableButtons(boolean isRecording) { enableButton(R.id.btnStart,!isRecording); enableButton(R.id.btnStop,isRecording); } private String getFilename(){ String filepath = Environment.getExternalStorageDirectory().getPath(); File file = new File(filepath,System.currentTimeMillis() + AUDIO_RECORDER_FILE_EXT_WAV/*AUDIO_RECORDER_FOLDER*/); if(!file.exists()){ file.mkdirs(); } return (filepath + "/" + System.currentTimeMillis() + AUDIO_RECORDER_FILE_EXT_WAV); } private String getTempFilename(){ String filepath = Environment.getExternalStorageDirectory().getPath(); File tempFile = new File(filepath,AUDIO_RECORDER_TEMP_FILE); if(tempFile.exists()){ tempFile.delete(); } tempFile.mkdirs(); return (filepath + "/" +AUDIO_RECORDER_TEMP_FILE); } private void startRecording(){ /*int i = recorder.getState(); if(i==1)*/ recorder.startRecording(); isRecording = true; recordingThread = new Thread(new Runnable() { @Override public void run() { writeAudioDataToFile(); } },"AudioRecorder Thread"); recordingThread.start(); } private void writeAudioDataToFile(){ byte data[] = new byte[bufferSize]; String filename = getTempFilename(); FileOutputStream os = null; try { os = new FileOutputStream(filename); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } int read = 0; if(null != os){ while(isRecording){ read = recorder.read(data, 0, bufferSize); if(AudioRecord.ERROR_INVALID_OPERATION != read){ try { os.write(data); } catch (IOException e) { e.printStackTrace(); } } } try { os.close(); } catch (IOException e) { e.printStackTrace(); } } } private void stopRecording(){ if(null != recorder){ isRecording = false; int i = recorder.getState(); if(i==1) recorder.stop(); recorder.release(); recorder = null; recordingThread = null; } copyWaveFile(getTempFilename(),getFilename()); deleteTempFile(); } private void deleteTempFile() { File file = new File(getTempFilename()); file.delete(); } private void copyWaveFile(String inFilename,String outFilename){ FileInputStream in = null; FileOutputStream out = null; long totalAudioLen = 0; long totalDataLen = totalAudioLen + 36; long longSampleRate = RECORDER_SAMPLERATE; int channels = 1; long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels/8; byte[] data = new byte[bufferSize]; try { in = new FileInputStream(inFilename); out = new FileOutputStream(outFilename); totalAudioLen = in.getChannel().size(); totalDataLen = totalAudioLen + 36; WriteWaveFileHeader(out, totalAudioLen, totalDataLen, longSampleRate, channels, byteRate); while(in.read(data) != -1){ out.write(data); } in.close(); out.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } private void WriteWaveFileHeader( FileOutputStream out, long totalAudioLen, long totalDataLen, long longSampleRate, int channels, long byteRate) throws IOException { byte[] header = new byte[44]; header[0] = 'R'; // RIFF/WAVE header header[1] = 'I'; header[2] = 'F'; header[3] = 'F'; header[4] = (byte) (totalDataLen & 0xff); header[5] = (byte) ((totalDataLen >> 8) & 0xff); header[6] = (byte) ((totalDataLen >> 16) & 0xff); header[7] = (byte) ((totalDataLen >> 24) & 0xff); header[8] = 'W'; header[9] = 'A'; header[10] = 'V'; header[11] = 'E'; header[12] = 'f'; // ‘fmt ‘ chunk header[13] = 'm'; header[14] = 't'; header[15] = ' '; header[16] = 16; // 4 bytes: size of ‘fmt ‘ chunk header[17] = 0; header[18] = 0; header[19] = 0; header[20] = 1; // format = 1 header[21] = 0; header[22] = (byte) channels; header[23] = 0; header[24] = (byte) (longSampleRate & 0xff); header[25] = (byte) ((longSampleRate >> 8) & 0xff); header[26] = (byte) ((longSampleRate >> 16) & 0xff); header[27] = (byte) ((longSampleRate >> 24) & 0xff); header[28] = (byte) (byteRate & 0xff); header[29] = (byte) ((byteRate >> 8) & 0xff); header[30] = (byte) ((byteRate >> 16) & 0xff); header[31] = (byte) ((byteRate >> 24) & 0xff); header[32] = (byte) (2 * 16 / 8); // block align header[33] = 0; header[34] = (byte) RECORDER_BPP; // bits per sample header[35] = 0; header[36] = 'd'; header[37] = 'a'; header[38] = 't'; header[39] = 'a'; header[40] = (byte) (totalAudioLen & 0xff); header[41] = (byte) ((totalAudioLen >> 8) & 0xff); header[42] = (byte) ((totalAudioLen >> 16) & 0xff); header[43] = (byte) ((totalAudioLen >> 24) & 0xff); out.write(header, 0, 44); } public AudioRecord findAudioRecord() { for (int rate : sampleRates) { for (short audioFormat : audioFormats) { for (short channelConfig : channelConfigs) { try { Log.d(TAG, "Attempting rate " + rate + "Hz, bits: " + audioFormat + ", channel: " + channelConfig); bufferSize = AudioRecord.getMinBufferSize(rate, channelConfig, audioFormat); if(audioFormat==AudioFormat.ENCODING_PCM_16BIT){ RECORDER_BPP = 16; } else if(audioFormat==AudioFormat.ENCODING_PCM_8BIT){ RECORDER_BPP = 8; } RECORDER_SAMPLERATE = rate; if (bufferSize != AudioRecord.ERROR_BAD_VALUE) { recorder = new AudioRecord(AudioSource.DEFAULT, rate, channelConfig, audioFormat, bufferSize); if (recorder.getState() == AudioRecord.STATE_INITIALIZED) return recorder; } } catch (Exception e) { Log.e(TAG, rate + "Exception, keep trying.",e); } } } } return null; } private View.OnClickListener btnClick = new View.OnClickListener() { @Override public void onClick(View v) { switch(v.getId()){ case R.id.btnStart:{ enableButtons(true); startRecording();
コード
E/AndroidRuntime(10700): FATAL EXCEPTION: main E/AndroidRuntime(10700): java.lang.NullPointerException E/AndroidRuntime(10700): at com.example.s3033051.jissen2samp1.MainActivity.startRecording(MainActivity.java:90) E/AndroidRuntime(10700): at com.example.s3033051.jissen2samp1.MainActivity.access$1(MainActivity.java:86) E/AndroidRuntime(10700): at com.example.s3033051.jissen2samp1.MainActivity$1.onClick(MainActivity.java:292) E/AndroidRuntime(10700): at android.view.View.performClick(View.java:4204) E/AndroidRuntime(10700): at android.view.View$PerformClick.run(View.java:17355) E/AndroidRuntime(10700): at android.os.Handler.handleCallback(Handler.java:725) E/AndroidRuntime(10700): at android.os.Handler.dispatchMessage(Handler.java:92) E/AndroidRuntime(10700): at android.os.Looper.loop(Looper.java:137) E/AndroidRuntime(10700): at android.app.ActivityThread.main(ActivityThread.java:5292) E/AndroidRuntime(10700): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime(10700): at java.lang.reflect.Method.invoke(Method.java:511) E/AndroidRuntime(10700): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1031) E/AndroidRuntime(10700): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:798) E/AndroidRuntime(10700): at dalvik.system.NativeStart.main(Native Method)
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