我正在创建一个Android应用程序，它记录并保存一个wave文件并播放它。播放.wav文件时，我有一个可视化工具。但是，我希望应用程序在录制时可视化，以便用户获得反馈并知道录制正在运行。我尝试的所有技术要么导致程序崩溃，要么根本不起作用。任何帮助表示赞赏。
在下面的迭代中，当我使用recorder.getAudioSessionId（）进行录制时尝试设置可视化工具时会出现问题。在“setupRecorderVisualizerFxAndUI（）”方法中。当我按下录制按钮时，这会导致程序崩溃。使用mPlayer.getAudioSessionId（）时，相同的技术在播放时完美运行;在setupPlaybackVisualizerFxAndUI（）方法中。
以下是我的主要活动：
package beebros.androidaudiovisualizer;
import android.content.pm.PackageManager;
import android.graphics.Canvas;
import android.graphics.Color;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Environment;
import android.os.Parcel;
import android.support.annotation.NonNull;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v7.app.ActionBarActivity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.audiofx.Visualizer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.IOException;
import java.util.List;
public class MainActivity extends ActionBarActivity {
VisualizerView mVisualizerView;
private Visualizer mVisualizer;
private static MediaRecorder mRecorder;
private static MediaPlayer mPlayer;
private static String audioFilePath;
private static String audioFilePathTemp;
private static Button stopButton;
private static Button playButton;
private static Button recordButton;
private boolean isRecording = false;
private static final int RECORDER_BPP = 16;
private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".wav";
private static final String AUDIO_RECORDER_FOLDER = "AudioRecorder";
private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw";
private static final int RECORDER_SAMPLERATE = 44100;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_STEREO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private AudioRecord recorder = null;
private int bufferSize = 0;
private Thread recordingThread = null;
String filePlace;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mVisualizerView = (VisualizerView) findViewById(R.id.myvisualizerview); //reference to visualizer in xml
//identifies location of SD card, where the recording will be stored
//should probably check first if phone has an SDCard
audioFilePath = Environment.getExternalStorageDirectory().getAbsolutePath() +
"myaudio.wav";//"/myaudio.3gp";
//gets references to the buttons
recordButton = (Button) findViewById(R.id.recordButton);
playButton = (Button) findViewById(R.id.playButton);
stopButton = (Button) findViewById(R.id.stopButton);
//check if there is a microphone
if (!hasMicrophone()) { //turns off buttons if no microphone
stopButton.setEnabled(false);
playButton.setEnabled(false);
recordButton.setEnabled(false);
} else {
playButton.setEnabled(false);
stopButton.setEnabled(false);
}
bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
}
public void recordAudio(View view) throws IOException {
isRecording = true;
//enables/disables appropriate buttons
stopButton.setEnabled(true);
playButton.setEnabled(false);
recordButton.setEnabled(false);
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
RECORDER_SAMPLERATE, RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING, bufferSize);
recorder.startRecording();
isRecording = true;
recordingThread = new Thread(new Runnable() {
@Override
public void run() {
writeAudioDataToFile();
}
},"AudioRecorder Thread");
recordingThread.start();
setupRecorderVisualizerFxAndUI();//method that sets up the visualizer while recording and causes the crash
try {
mVisualizer.setEnabled(true); //enabling the visualizer is what actually makes it crash
//calling setupRecorderVisualizerFxAndUI(); alone does not crash
} catch (Exception e){
Log.e(TAG,Log.getStackTraceString(e));
}
}
public void stopAudio(View view) {
playButton.setEnabled(true);
if(null != recorder){
isRecording = false;
recorder.stop();
recorder.release();
recorder = null;
recordingThread = null;
}
recordButton.setEnabled(true); //
filePlace = getFilename();
copyWaveFile(getTempFilename(),getFilename());//copies the latest recording to the permanent folder.
deleteTempFile();
mVisualizer.setEnabled(false);
}
//plays the audio and visuals
public void playAudio(View view) throws IOException {
//enables/diables appt. buttons
playButton.setEnabled(false);
recordButton.setEnabled(false);
stopButton.setEnabled(true);
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath,AUDIO_RECORDER_FOLDER);
setVolumeControlStream(AudioManager.STREAM_MUSIC);
mPlayer = MediaPlayer.create(this, Uri.parse(file.getAbsolutePath() + "/" + "1426282058997" + AUDIO_RECORDER_FILE_EXT_WAV)); //plays back a specific file saved on my phone for testing
setupPlaybackVisualizerFxAndUI();
// Make sure the visualizer is enabled only when you actually want to
// receive data, and when it makes sense to receive data.
mVisualizer.setEnabled(true);
// When the stream ends, we don't need to collect any more data. We
// don't do this in setupVisualizerFxAndUI because we likely want to have more,
// non-Visualizer related code in this callback.
mPlayer
.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
public void onCompletion(MediaPlayer mediaPlayer) {
mVisualizer.setEnabled(false);
}
});
mPlayer.start();
}
//method to check for the presence of a microphone
protected boolean hasMicrophone() {
PackageManager pManager = this.getPackageManager();
return pManager.hasSystemFeature(PackageManager.FEATURE_MICROPHONE);
}
@Override
protected void onPause() {
super.onPause();
if (isFinishing() && mPlayer != null) { //d
mVisualizer.release();
mPlayer.release(); //d
mPlayer = null; //d
}
}
private void setupPlaybackVisualizerFxAndUI() {
// Create the Visualizer object and attach it to our media player.
mVisualizer = new Visualizer(mPlayer.getAudioSessionId());
mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
mVisualizer.setDataCaptureListener(
new Visualizer.OnDataCaptureListener() {
public void onWaveFormDataCapture(Visualizer visualizer,
byte[] bytes, int samplingRate) {
mVisualizerView.updateVisualizer(bytes);
}
public void onFftDataCapture(Visualizer visualizer,
byte[] bytes, int samplingRate) {
}
}, Visualizer.getMaxCaptureRate() / 2, true, false);
}
private void setupRecorderVisualizerFxAndUI() {
// Create the Visualizer object and attach it to our media player.
mVisualizer = new Visualizer(recorder.getAudioSessionId());//calling recorder.getAudioSessionId causes the application to crash.
mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
mVisualizer.setDataCaptureListener(
new Visualizer.OnDataCaptureListener() {
public void onWaveFormDataCapture(Visualizer visualizer,
byte[] bytes, int samplingRate) {
mVisualizerView.updateVisualizer(bytes);
}
public void onFftDataCapture(Visualizer visualizer,
byte[] bytes, int samplingRate) {
}
}, Visualizer.getMaxCaptureRate() / 2, true, false);
}
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 String getFilename(){
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath,AUDIO_RECORDER_FOLDER);
if(!file.exists()){
file.mkdirs();
}
return (file.getAbsolutePath() + "/" + "myAudioFile" + AUDIO_RECORDER_FILE_EXT_WAV);
}
private String getTempFilename(){
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath,AUDIO_RECORDER_FOLDER);
if(!file.exists()){
file.mkdirs();
}
File tempFile = new File(filepath,AUDIO_RECORDER_TEMP_FILE);
if(tempFile.exists())
tempFile.delete();
return (file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE);
}
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 = 2;
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;
//AppLog.logString("File size: " + totalDataLen);
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] = 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);
}
}
我可以提供.xml和AndroidVisualizer.java opon请求的代码。
谢谢！
logcat的：
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer E/AudioEffect﹕ set(): AudioFlinger could not create effect, status: -22
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer E/visualizers-JNI﹕ Visualizer initCheck failed -4
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer E/Visualizer-JAVA﹕ Error code -4 when initializing Visualizer.
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ java.lang.RuntimeException: Cannot initialize Visualizer engine, error: -4
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at android.media.audiofx.Visualizer.<init>(Visualizer.java:217)
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at beebros.androidaudiovisualizer.MainActivity.setupRecorderVisualizerFxAndUI(MainActivity.java:233)
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at beebros.androidaudiovisualizer.MainActivity.recordAudio(MainActivity.java:132)
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at android.view.View$1.onClick(View.java:3978)
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at android.view.View.performClick(View.java:4654)
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at android.view.View$PerformClick.run(View.java:19438)
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:733)
03-21 14:09:00.475 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95)
03-21 14:09:00.485 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at android.os.Looper.loop(Looper.java:146)
03-21 14:09:00.485 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5487)
03-21 14:09:00.485 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
03-21 14:09:00.485 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
03-21 14:09:00.485 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
03-21 14:09:00.485 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
03-21 14:09:00.485 2351-2351/beebros.androidaudiovisualizer W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)
03-21 14:09:00.485 2351-2351/beebros.androidaudiovisualizer E/Messed Up﹕ java.lang.NullPointerException
at beebros.androidaudiovisualizer.MainActivity.recordAudio(MainActivity.java:134)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.view.View$1.onClick(View.java:3978)
at android.view.View.performClick(View.java:4654)
at android.view.View$PerformClick.run(View.java:19438)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5487)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)