I'm working on a project with voice recording, I'm halfway gone, I already have the recorder working and saving the recording according to the code below, but I'm having some problems: 1º I can not create a folder to save the I can not list the audios in the listView, 3rd I have no idea how to delete the audios after they have been created and displayed in the ListView. follows the code of the .java and XML writer. NOTE: I'm not going to put the listview's display code because it has nothing implemented.
import android.content.pm.PackageManager;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.io.IOException;
import java.util.Random;
import static android.Manifest.permission.RECORD_AUDIO;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
public class Gravador extends AppCompatActivity {
Button buttonStart, buttonStop, buttonPlayLastRecordAudio, buttonStopPlayingRecording ;
String AudioSavePathInDevice = null;
MediaRecorder mediaRecorder ;
Random random ;
String RandomAudioFileName = "ABCDEFGHIJKLMNOP";
public static final int RequestPermissionCode = 1;
MediaPlayer mediaPlayer ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gravador);
buttonStart = (Button) findViewById(R.id.button);
buttonStop = (Button) findViewById(R.id.button2);
buttonPlayLastRecordAudio = (Button) findViewById(R.id.button3);
buttonStopPlayingRecording = (Button)findViewById(R.id.button4);
buttonStop.setEnabled(false);
buttonPlayLastRecordAudio.setEnabled(false);
buttonStopPlayingRecording.setEnabled(false);
random = new Random();
buttonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(checkPermission()) {
AudioSavePathInDevice = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + CreateRandomAudioFileName(5) + "AudioRecording.3gp";
MediaRecorderReady();
try {
mediaRecorder.prepare();
mediaRecorder.start();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
buttonStart.setEnabled(false);
buttonStop.setEnabled(true);
Toast.makeText(Gravador.this, "Recording started", Toast.LENGTH_LONG).show();
}
else {
requestPermission();
}
}
});
buttonStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mediaRecorder.stop();
buttonStop.setEnabled(false);
buttonPlayLastRecordAudio.setEnabled(true);
buttonStart.setEnabled(true);
buttonStopPlayingRecording.setEnabled(false);
Toast.makeText(Gravador.this, "Recording Completed", Toast.LENGTH_LONG).show();
}
});
buttonPlayLastRecordAudio.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) throws IllegalArgumentException, SecurityException, IllegalStateException {
buttonStop.setEnabled(false);
buttonStart.setEnabled(false);
buttonStopPlayingRecording.setEnabled(true);
mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource(AudioSavePathInDevice);
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.start();
Toast.makeText(Gravador.this, "Recording Playing", Toast.LENGTH_LONG).show();
}
});
buttonStopPlayingRecording.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
buttonStop.setEnabled(false);
buttonStart.setEnabled(true);
buttonStopPlayingRecording.setEnabled(false);
buttonPlayLastRecordAudio.setEnabled(true);
if(mediaPlayer != null){
mediaPlayer.stop();
mediaPlayer.release();
MediaRecorderReady();
}
}
});
}
public void MediaRecorderReady(){
mediaRecorder=new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
mediaRecorder.setOutputFile(AudioSavePathInDevice);
}
public String CreateRandomAudioFileName(int string){
StringBuilder stringBuilder = new StringBuilder( string );
int i = 0 ;
while(i < string ) {
stringBuilder.append(RandomAudioFileName.charAt(random.nextInt(RandomAudioFileName.length())));
i++ ;
}
return stringBuilder.toString();
}
private void requestPermission() {
ActivityCompat.requestPermissions(Gravador.this, new String[]{WRITE_EXTERNAL_STORAGE, RECORD_AUDIO}, RequestPermissionCode);
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case RequestPermissionCode:
if (grantResults.length > 0) {
boolean StoragePermission = grantResults[0] == PackageManager.PERMISSION_GRANTED;
boolean RecordPermission = grantResults[1] == PackageManager.PERMISSION_GRANTED;
if (StoragePermission && RecordPermission) {
Toast.makeText(Gravador.this, "Permission Granted", Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(Gravador.this,"Permission Denied",Toast.LENGTH_LONG).show();
}
}
break;
}
}
public boolean checkPermission() {
int result = ContextCompat.checkSelfPermission(getApplicationContext(), WRITE_EXTERNAL_STORAGE);
int result1 = ContextCompat.checkSelfPermission(getApplicationContext(), RECORD_AUDIO);
return result == PackageManager.PERMISSION_GRANTED && result1 == PackageManager.PERMISSION_GRANTED;
}
}
Writer XML
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:src="@drawable/mic_pic"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Record"
android:id="@+id/button"
android:layout_below="@+id/imageView"
android:layout_alignParentLeft="true"
android:layout_marginTop="37dp"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="STOP"
android:id="@+id/button2"
android:layout_alignTop="@+id/button"
android:layout_centerHorizontal="true"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Play"
android:id="@+id/button3"
android:layout_alignTop="@+id/button2"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="STOP PLAYING RECORDING "
android:id="@+id/button4"
android:layout_below="@+id/button2"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
/>
</RelativeLayout>