Wes Summers Wes Summers -3 years ago 89
Java Question

using openFileInput to read a 3gp file, is it possible?

I am trying to use openFileInput to read a 3gp file that is generated earlier in the code and saved wherever the Environment saves the file. Is this even possible and if not, how should I be approaching this problem?
Here is the specific method:

public String readFile(String file){
String rawdata = "";
try{
FileInputStream fis = openFileInput(file);
int size = fis.available();
byte[] buffer = new byte[size];
fis.read(buffer);
fis.close();
rawdata = new String(buffer);
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(ReceiveScreen.this, "Error reading file!", Toast.LENGTH_SHORT).show();
}
return rawdata;
}


and here is the entire activity if that helps:

package com.example.wesle.noisemachine;

import android.content.Intent;
import android.media.MediaCodec;
import android.media.MediaFormat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.AppCompatDrawableManager;
import android.view.View;
import android.widget.Button;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Environment;
import android.widget.Toast;

import java.io.FileInputStream;
import java.io.IOException;

public class ReceiveScreen extends AppCompatActivity {

private Button buttonStart, buttonStop, buttonPlay, buttonDecode;
private MediaRecorder mediaRecorder = new MediaRecorder();
private String outputFile;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_receive_screen);

buttonStart = (Button) findViewById(R.id.buttonStart);
buttonStop = (Button) findViewById(R.id.buttonStop);
buttonPlay = (Button) findViewById(R.id.buttonPlay);
buttonDecode = (Button) findViewById(R.id.buttonDecode);
buttonStop.setEnabled(false);
buttonPlay.setEnabled(false);
outputFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "/recording.3gp";
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mediaRecorder.setOutputFile(outputFile);

buttonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try {
mediaRecorder.prepare();
mediaRecorder.start();
} catch (IllegalStateException ise) {
System.out.println("ISE Catch");
} catch (IOException ioe) {
System.out.println("IO Catch");

}
buttonStart.setEnabled(false);
buttonStop.setEnabled(true);


Toast.makeText(getApplicationContext(), "Recording started", Toast.LENGTH_LONG).show();


}
});

buttonStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

mediaRecorder.stop();
mediaRecorder.release();

buttonStop.setEnabled(false);
buttonPlay.setEnabled(true);
buttonStart.setEnabled(true);

Toast.makeText(getApplicationContext(), "Recording Completed", Toast.LENGTH_LONG).show();
}
});

buttonPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
MediaPlayer mediaPlayer = new MediaPlayer();

try {
mediaPlayer.setDataSource(outputFile);
mediaPlayer.prepare();
mediaPlayer.start();
} catch (Exception e) {
System.out.println("E Catch");
}
Toast.makeText(getApplicationContext(), "Recording Playing", Toast.LENGTH_LONG).show();
}
});

buttonDecode.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
System.out.println(readFile("recording.3gp"));

Toast.makeText(getApplicationContext(), "Decoding", Toast.LENGTH_LONG).show();
}
});

//Code for the back button
Button backbuttonR = (Button) findViewById(R.id.backbuttonR);
backbuttonR.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(ReceiveScreen.this, MainActivity.class));
}
});
}

public String readFile(String file){
String rawdata = "";
try{
FileInputStream fis = openFileInput(file);
int size = fis.available();
byte[] buffer = new byte[size];
fis.read(buffer);
fis.close();
rawdata = new String(buffer);
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(ReceiveScreen.this, "Error reading file!", Toast.LENGTH_SHORT).show();
}
return rawdata;
}
}

Answer Source

Is this even possible

No, because openFileInput() does not have anything to do with Environment.

how should I be approaching this problem?

Use new FileInputStream(), passing in a File object. You are already creating the File object (outputFile).

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