イタリックテキスト ```public class MainActivity extends Activity {
@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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