在我的应用程序中有许多活动，我正在尝试在一个活动中进行录制并将其存储在手机文件中。然后在另一个活动中，我想要播放该文件。我想我可能有一个问题，我如何保存原始文件，因为它想要读取文件时第二个活动崩溃。我不确定如何保存在一个活动中，然后在下一个活动中读取该音频文件。我已经包含了我认为是两个活动的相关代码。
//This is the Activity that simply records and then saves the audio file
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Context mContext = getApplicationContext();
createTempFile("Status_Recorder.txt", "INPROGRESS");
/*
* Create the file where the audio tone that is recorded will be saved
*
*/
try{
FileOutputStream fOut = openFileOutput("audio_test_right.3gp" , MODE_WORLD_READABLE);
}catch(IOException e) {
e.printStackTrace();
exit_function();
}
path = mContext.getFilesDir()+"/audio_test_right.3gp";
start_recording();
}
//Method to Start the Recording
private void start_recording() {
//Intialize the recorder
try{
speaker_recorder = new MediaRecorder();
speaker_recorder.reset();
} catch(Exception e){
Log.e(log_tag,"Recorder Initialization Failed");
createTempFile("Status.txt", "COMPLETED-RECORDER FAILED");
}
//Setting for the Recorder
try{
Log.i(log_tag,"Setting the recorder");
speaker_recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
speaker_recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
speaker_recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
speaker_recorder.setOutputFile(path);
} catch(Exception e){
Log.e(log_tag,"Recording Settings Failed");
createTempFile("Status.txt", "COMPLETED-RECORDER FAILED");
}
//Prepare the Recorder
try{
Log.i(log_tag,"Preparing the Recorder");
speaker_recorder.prepare();
} catch(Exception e){
Log.e(log_tag,"Recording failed");
createTempFile("Status.txt", "COMPLETED-RECORDER FAILED");
exit_function();
}
//Start the Recorder
try {
Log.i(log_tag,"Starting the recorder");
title_text = ((TextView) findViewById(R.id.textView));
title_text.setTextColor(Color.RED);
title_text.setText("RECORDING");
speaker_recorder.start();
// Thread.sleep(10000);
mHandler.postDelayed(new Runnable() {
public void run() {
createTempFile("Status_Recorder.txt", "COMPLETED-RECORDER FAILED");
exit_function();
}
}, timer);
} catch (Exception e) {
Log.e(log_tag,"Recorder start failed");
createTempFile("Status.txt", "COMPLETED-RECORDER FAILED");
exit_function();
}
}
private void exit_function() {
if (speaker_recorder != null) {
speaker_recorder.release();
}
onDestroy();
}
@Override
/*
* (non-Javadoc)
* @see android.app.Activity#onDestroy()
* Function invoked before we exit the application . Reset all the volume
* and stream values in this function
*/
protected void onDestroy() {
Log.i(log_tag,"Entered onDestroy()");
super.onDestroy();
this.finish();
}
/*
* Function to create the a text file in the application directory context. This function
* takes the file name and the string that is to be written in it as the input. This function is invoked
* to create the Result.txt file.
*/
private void createTempFile(String filename, String text) {
try {
FileOutputStream fOut = openFileOutput(filename , MODE_WORLD_READABLE);
OutputStreamWriter osw = new OutputStreamWriter(fOut);
osw.write(text);
osw.flush();
osw.close();
} catch(IOException e) {
e.printStackTrace();
}
}
//这是第二个Activity，但是当它到达mp.setDataSource（path）时崩溃;因为我猜它无法找到路径
private void playSound(boolean speakers) {
mContext = getApplicationContext();
// audioManager.setMicrophoneMute(true);
path = mContext.getFilesDir() + "/audio_test_right.3gp";
audioManager.setSpeakerphoneOn(true);
try {
mp.setDataSource(path);
} catch (IOException e) {
e.printStackTrace();
}
if (speakers) {
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
} else {
mp.setAudioStreamType(AudioManager.STREAM_VOICE_CALL);
}
mp.start();
mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
createTempFile("Status_RightSpeaker.txt", "COMPLETED");
exit_function();
}
});
}
}
答案 0 :(得分：1)
好的，所以我有一个问题的工作代码
此方法提供true时开始录制，否则停止录制。所以你可以在你的第一个活动
private void startOrStopRecording(boolean record){
if (record) {
// Record the audio
mMediaRecorder = new MediaRecorder();
mMediaRecorder.reset();
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mMediaRecorder.setOutputFile(getFilesDir().getAbsolutePath() + "/audio_test.3gp");
try {
mMediaRecorder.prepare();
} catch (IOException e) {
e.printStackTrace();
}
mMediaRecorder.start();
}else{
// Stop recording
if (mMediaRecorder != null){
mMediaRecorder.stop();
mMediaRecorder.release();
mMediaRecorder = null;
}
}
}
此方法在提供true时开始播放声音停止。所以你可以在你的第二个活动
注意String mFile = getFilesDir().getAbsolutePath() + "/audio_test.3gp";
private void playOrStop(boolean play){
mPlayer = new MediaPlayer();
try{
if (play){
mPlayer.setDataSource(mFile);
mPlayer.prepare();
mPlayer.start();
}else {
mPlayer.stop();
mPlayer.release();
mPlayer = null;
}
}catch (IOException e){
Log.e("Mtali", e.getMessage());
}
}
请务必添加权限
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<强> B.O.N.U.S
您可以使用ToggleButton
START＆amp;停止录制
JAVA
final ToggleButton recordButton = (ToggleButton) findViewById(R.id.record_button);
recordButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
startOrStopRecording(isChecked);
}
});
XML
<ToggleButton
android:id="@+id/record_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textOff="@string/start_playback_string"
android:textOn="@string/stop_playback_string"/>
开始和停止播放
JAVA
ToggleButton button = (ToggleButton) findViewById(R.id.play_button);
button.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
playOrStop(isChecked);
}
});
XML
<ToggleButton
android:id="@+id/play_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:textOff="@string/start_playback_string"
android:textOn="@string/stop_playback_string"/>