[英]Android Q, how to save audio recording with MediaStore with the correct file name?
[英]Android: How can I compress an audio file after recording it and then save it
我知道如何使用MediaRecorder錄制音頻文件。 我想將音頻文件上傳到服務器上,但是在此之前,我想對其進行壓縮。
注意:我正在以.3gpp格式錄制音頻。 這是我的課:
package com.iotaconcepts.task3;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import java.io.File;
import java.io.IOException;
public class MainActivity extends AppCompatActivity
{
MediaPlayer mediaPlayer;
MediaRecorder recorder;
String OUTPUT_FILE;
Button beginRecording, stopRecording, playRecording, stopPlayback;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
OUTPUT_FILE = Environment.getExternalStorageDirectory() + "/audiorecorder.3gpp";
beginRecording = (Button)findViewById(R.id.bt_begin);
stopRecording = (Button)findViewById(R.id.bt_stop_recording);
playRecording = (Button)findViewById(R.id.bt_play_recording);
stopPlayback = (Button)findViewById(R.id.bt_stop_playback);
beginRecording.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
beginRecording();
} catch (IOException e) {
e.printStackTrace();
}
}
});
stopRecording.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
stopRecording();
}
});
playRecording.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
playRecording();
} catch (IOException e) {
e.printStackTrace();
}
}
});
stopPlayback.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
stopPlayback();
}
});
}
public void beginRecording() throws IOException {
// If media recorder is working ... stop it
ditchMediaRecorder();
File outFile = new File(OUTPUT_FILE);
if(outFile.exists())
outFile.delete();
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(OUTPUT_FILE);
recorder.prepare();
recorder.start();
}
public void stopRecording()
{
if (recorder != null)
recorder.stop();
}
public void playRecording() throws IOException
{
ditchMediaPlayer();
mediaPlayer = new MediaPlayer();
mediaPlayer.setDataSource(OUTPUT_FILE);
mediaPlayer.prepare();
mediaPlayer.start();
}
public void stopPlayback()
{
if (mediaPlayer != null)
{
mediaPlayer.stop();
}
}
public void ditchMediaRecorder()
{
if(recorder!=null)
{
recorder.release();
}
}
public void ditchMediaPlayer()
{
if (mediaPlayer != null)
{
mediaPlayer.release();
}
}
}
我已經在清單中包含了所需的權限。
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
如果您正在尋找快速無損壓縮,請查看LZ4: https : //github.com/jpountz/lz4-java 。 它提供兩種壓縮方法:快速掃描(LZ4)和高壓縮(LZ4 HC)。 可以在以下位置找到jar文件: http : //java2s.com/Code/Jar/l/Downloadlz4120jar.htm
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