如何使用java类？安卓工作室
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【中文标题】如何使用java类？安卓工作室【英文标题】：How to use java class ? Android studio 【发布时间】：2017-06-21 08:52:13 【问题描述】：我找到了一个 java 类来帮助立即记录和流式传输数据：
/*
* Thread to manage live recording/playback of voice input from the device's microphone.
*/
private class Audio extends Thread
private boolean stopped = false;
/**
* Give the thread high priority so that it's not canceled unexpectedly, and start it
*/
private Audio()
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
start();
@Override
public void run()
Log.i("Audio", "Running Audio Thread");
AudioRecord recorder = null;
AudioTrack track = null;
short[][] buffers = new short[256][160];
int ix = 0;
/*
* Initialize buffer to hold continuously recorded audio data, start recording, and start
* playback.
*/
try
int N = AudioRecord.getMinBufferSize(8000,AudioFormat.CHANNEL_IN_MONO,AudioFormat.ENCODING_PCM_16BIT);
recorder = new AudioRecord(Audiosource.MIC, 8000, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, N*10);
track = new AudioTrack(AudioManager.STREAM_MUSIC, 8000,
AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, N*10, AudioTrack.MODE_STREAM);
recorder.startRecording();
track.play();
/*
* Loops until something outside of this thread stops it.
* Reads the data from the recorder and writes it to the audio track for playback.
*/
while(!stopped)
Log.i("Map", "Writing new data to buffer");
short[] buffer = buffers[ix++ % buffers.length];
N = recorder.read(buffer,0,buffer.length);
track.write(buffer, 0, buffer.length);
catch(Throwable x)
Log.w("Audio", "Error reading voice audio", x);
/*
* Frees the thread's resources after the loop completes so that it can be run again
*/
finally
recorder.stop();
recorder.release();
track.stop();
track.release();
/**
* Called from outside of the thread in order to stop the recording/playback loop
*/
private void close()
stopped = true;
来源：Android: Need to record mic input
我想在我的应用程序中使用这个类，但我不知道它是如何工作的。我想从我的主要活动中同时记录和流式传输数据。
编辑 1：我在这里调用对象：
public static class TypingDialogFragment extends DialogFragment
EditText cmdLine;
static MainActivity parentActivity;
static ThreadConnected cmdThreadConnected;
static int a=0;
static int type1=0;
static int type2=0;
static int run_voice=0;
static int run_voice1=0;
static byte[] memory_freq="100".getBytes();
static byte[] gain_rf="42".getBytes();
static byte[] gain_if="47".getBytes();
static byte[] gain_bb="0".getBytes();
byte[] NewLine = "\n".getBytes();
byte[] kill="killall python".getBytes();
byte[] run_emetteur="DISPLAY=:0 python emetteur.py --freq ".getBytes();
byte[] run_receiver="DISPLAY=:0 python receiver.py --freq ".getBytes();
byte[] end_command = "&".getBytes();
byte[] freq_Mhz = "e6 ".getBytes();
byte[] RF_text=" --RF ".getBytes();
byte[] IF_text=" --IF ".getBytes();
byte[] BB_text=" --BB ".getBytes();
// MediaPlayer
private String OUTPUT_FILE;
private boolean stopped = false;
MediaPlayer mediaPlayer;
MediaRecorder mediaRecorder;
File outFile;
// Image button
ImageButton send_voice;
Chronometer myChrono;
ProgressBar progressBar;
Audio record_song; // My VARIABLE -------------------------------------------------------------------------------------------
static TypingDialogFragment newInstance(MainActivity parent, ThreadConnected thread, int type)
type1=type;
parentActivity = parent;
cmdThreadConnected = thread;
TypingDialogFragment f = new TypingDialogFragment();
return f;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
getDialog().setTitle("Cmd Line");
getDialog().setCanceledOnTouchOutside(false);
final View typingDialogView = inflater.inflate(R.layout.typing_layout, container, false);
ImageView imgCleaarCmd = (ImageView)typingDialogView.findViewById(R.id.clearcmd);
// Audio
/* OUTPUT_FILE= Environment.getExternalStorageDirectory()+ "/audiorecord.wav";
outFile=new File (OUTPUT_FILE);*/
record_song=new Audio(); // ERROR HERE --------------------------------------------------------------------------------
cmdLine = (EditText)typingDialogView.findViewById(R.id.cmdline);
myChrono=(Chronometer) getActivity().findViewById(R.id.chronometer1);
send_voice=(ImageButton) getActivity().findViewById(R.id.send_voice1);
progressBar=(ProgressBar) getActivity().findViewById(R.id.progressBar1);
Button bouton1 = (Button)typingDialogView.findViewById(R.id.button1);
Button bouton2=(Button)typingDialogView.findViewById(R.id.button2);
Button bouton3 = (Button)typingDialogView.findViewById(R.id.button3);
Button bouton4 = (Button)typingDialogView.findViewById(R.id.button4);
final ImageButton send_voice=(ImageButton)getActivity().findViewById(R.id.send_voice1);
imgCleaarCmd.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
dismiss();
);
if(type1==1)
bouton1.setText("STOP");
bouton2.setText("OFF");
bouton3.setText("Reset");
bouton4.setText("Enter");
if(type1==2)
bouton1.setText("TX");
bouton2.setText("RX");
bouton3.setText("Clear");
bouton4.setText("Enter");
if(type1==3)
bouton1.setText("Gain RF");
bouton2.setText("Gain IF");
bouton3.setText("Gain BB");
bouton4.setText("Enter");
bouton1.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if (type1==1)
cmdLine.setText("killall python");
if (type1==2)
cmdLine.setHint("// Partie Emission");
a=1;
if (type1==3)
type2=1;
cmdLine.setHint("// Gain RF");
);
bouton2.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if (type1==1)
cmdLine.setText("sudo poweroff");
if (type1==2)
cmdLine.setHint("// Partie Reception");
a=2;
if (type1==3)
byte[] bytesToSend = cmdLine.getText().toString().getBytes();
if (bytesToSend!=null)
type2=2;
cmdLine.setHint("// Gain IF");
);
bouton3.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if (type1==1)
cmdLine.setText("sudo reboot");
a=1;
if (type1==2)
body.setText("");
if (type1==3)
byte[] bytesToSend = cmdLine.getText().toString().getBytes();
if (bytesToSend!=null)
type2=3;
cmdLine.setHint("// Gain BB");
);
bouton4.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if(cmdThreadConnected!=null)
if (type1==1)
// Command terminal
byte[] bytesToSend = cmdLine.getText().toString().getBytes();
cmdThreadConnected.write(bytesToSend);
byte[] NewLine = "\n".getBytes();
cmdThreadConnected.write(NewLine);
if (type1==2) // FREQUENCE lancement de la partie réception ou émission
if (a==1)
byte[] bytesToSend = cmdLine.getText().toString().getBytes();
memory_freq=bytesToSend;
cmdThreadConnected.write(kill);
cmdThreadConnected.write(NewLine);
cmdThreadConnected.write(run_emetteur);
cmdThreadConnected.write(memory_freq);
cmdThreadConnected.write(freq_Mhz);
cmdThreadConnected.write(RF_text);
cmdThreadConnected.write(gain_rf);
cmdThreadConnected.write(IF_text);
cmdThreadConnected.write(gain_if);
cmdThreadConnected.write(BB_text);
cmdThreadConnected.write(gain_bb);
cmdThreadConnected.write(end_command);
cmdThreadConnected.write(NewLine);
if (a==2)
byte[] bytesToSend = cmdLine.getText().toString().getBytes();
memory_freq=bytesToSend;
cmdThreadConnected.write(kill);
cmdThreadConnected.write(NewLine);
cmdThreadConnected.write(run_receiver);
cmdThreadConnected.write(memory_freq);
cmdThreadConnected.write(freq_Mhz);
cmdThreadConnected.write(RF_text);
cmdThreadConnected.write(gain_rf);
cmdThreadConnected.write(IF_text);
cmdThreadConnected.write(gain_if);
cmdThreadConnected.write(BB_text);
cmdThreadConnected.write(gain_bb);
cmdThreadConnected.write(end_command);
cmdThreadConnected.write(NewLine);
if(type1==3)
byte[] bytesToSend = cmdLine.getText().toString().getBytes();
if (type2==1)gain_rf=bytesToSend;
if (type2==2)gain_if=bytesToSend;
if (type2==3)gain_bb=bytesToSend;
dismiss();
);
send_voice.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if (run_voice==0)
try
beginRecording();
send_voice.setColorFilter(Color.RED);
progressBar.setVisibility(View.VISIBLE);
myChrono.setBase(SystemClock.elapsedRealtime());
myChrono.start();
cmdThreadConnected.write(kill);
cmdThreadConnected.write(NewLine);
cmdThreadConnected.write(run_emetteur);
cmdThreadConnected.write(memory_freq);
cmdThreadConnected.write(freq_Mhz);
cmdThreadConnected.write(RF_text);
cmdThreadConnected.write(gain_rf);
cmdThreadConnected.write(IF_text);
cmdThreadConnected.write(gain_if);
cmdThreadConnected.write(BB_text);
cmdThreadConnected.write(gain_bb);
cmdThreadConnected.write(end_command);
cmdThreadConnected.write(NewLine);
catch (IOException ex)
// if not working
run_voice1=1;
if (run_voice==1)
stopRecording();
send_voice.setColorFilter(Color.BLACK);
progressBar.setVisibility(View.INVISIBLE);
myChrono.stop();
cmdThreadConnected.write(kill);
cmdThreadConnected.write(NewLine);
cmdThreadConnected.write(run_receiver);
cmdThreadConnected.write(memory_freq);
cmdThreadConnected.write(freq_Mhz);
cmdThreadConnected.write(RF_text);
cmdThreadConnected.write(gain_rf);
cmdThreadConnected.write(IF_text);
cmdThreadConnected.write(gain_if);
cmdThreadConnected.write(BB_text);
cmdThreadConnected.write(gain_bb);
cmdThreadConnected.write(end_command);
cmdThreadConnected.write(NewLine);
run_voice1=0;
run_voice=run_voice1;
private void ditchMediaplayer()
if (mediaRecorder!=null)mediaRecorder.release();
try
mediaPlayer.release();
catch (Exception e)
e.printStackTrace();
private void beginRecording()throws IOException
/* ditchMediaplayer();
if (outFile.exists())
outFile.delete();
mediaRecorder=new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mediaRecorder.setOutputFile(OUTPUT_FILE);
mediaRecorder.prepare();
mediaRecorder.start();*/
record_song.run();
private void stopRecording()
/* if (mediaRecorder !=null)
mediaRecorder.stop();
mediaPlayer.release();
mediaPlayer = null;
*/
record_song.close();
);
return typingDialogView;
感谢您的帮助！
【问题讨论】：
【参考方案1】：在你的项目中新建一个同名的Java Class(右键目录->新建->Java类)，然后把这段代码粘贴进去。
您现在只需在代码中导入此类并使用它！
欲了解更多信息，请参阅here
【讨论】：
感谢您的帮助，但如果我直接在主要活动中添加此类，他不起作用？ 你可以在MainActivity中将这个类定义为一个内部类，只需复制你的MainActivity类里面的代码，然后使用它。请注意，private 意味着它只能在您的MainActivity 中使用。如果这是你喜欢/需要的，你可以做到
像任何其他 Java 类...Audio myAudioInstance = new Audio();
我试过了，但总是出现同样的错误：不能被静态上下文引用
请在您的问题中粘贴整个MainActivity 课程以上是关于如何使用java类？安卓工作室的主要内容，如果未能解决你的问题，请参考以下文章
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