Блог

MainActivity.java

 package com.gtappdevelopers.camviewlibrary;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.content.pm.PackageManager;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;


import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;

import static android.Manifest.permission.RECORD_AUDIO;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;

public class MainActivity extends AppCompatActivity {

//Intializing all variables..
private TextView startTV, stopTV, playTV, stopplayTV, statusTV;
//creating a variable for medi recorder object class.
private MediaRecorder mRecorder;
// creating a variable for mediaplayer class
private MediaPlayer mPlayer;
//string variable is created for storing a file name
private static String mFileName = null;
// constant for storing audio permission
public static final int REQUEST_AUDIO_PERMISSION_CODE = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //initialize all variables with their layout items.
    statusTV = findViewById(R.id.idTVstatus);
    startTV = findViewById(R.id.btnRecord);
    stopTV = findViewById(R.id.btnStop);
    playTV = findViewById(R.id.btnPlay);
    stopplayTV = findViewById(R.id.btnStopPlay);
    stopTV.setBackgroundColor(getResources().getColor(R.color.gray));
    playTV.setBackgroundColor(getResources().getColor(R.color.gray));
    stopplayTV.setBackgroundColor(getResources().getColor(R.color.gray));

    startTV.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // start recording method will start the recording of audio.
            startRecording();
        }
    });
    stopTV.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //pause Recording method will pause the recording of audio.
            pauseRecording();

        }
    });
    playTV.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // play audio method will play the audio which we have recorded
            playAudio();
        }
    });
    stopplayTV.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // pause play method will pause the play of audio
            pausePlaying();
        }
    });
}

private void startRecording() {
    // check permission method is used to check that the user has granted permission to record nd store the audio.
    if (CheckPermissions()) {
        //setbackgroundcolor method will change the background color of text view.
        stopTV.setBackgroundColor(getResources().getColor(R.color.purple_200));
        startTV.setBackgroundColor(getResources().getColor(R.color.gray));
        playTV.setBackgroundColor(getResources().getColor(R.color.gray));
        stopplayTV.setBackgroundColor(getResources().getColor(R.color.gray));
        //we are here initializing our filename variable with the path of the recorded audio file.
        mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
        mFileName  = "/AudioRecording.3gp";
        //below method is used to initialize the media recorder clss
        mRecorder = new MediaRecorder();
        //below method is used to set the audio source which we are using a mic.
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        //below method is used to set the output format of the audio.
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        //below method is used to set the audio encoder for our recorded audio.
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        //below method is used to set the output file location for our recorded audio
        mRecorder.setOutputFile(mFileName);
        try {
            //below mwthod will prepare our audio recorder class
            mRecorder.prepare();
        } catch (IOException e) {
            Log.e("TAG", "prepare() failed");
        }
        // start method will start the audio recording.
        mRecorder.start();
        statusTV.setText("Recording Started");
    } else {
        //if audio recording permissions are not granted by user below method will ask for runtime permission for mic and storage.
        RequestPermissions();
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    // this method is called when user will grant the permission for audio recording.
    switch (requestCode) {
        case REQUEST_AUDIO_PERMISSION_CODE:
            if (grantResults.length > 0) {
                boolean permissionToRecord = grantResults[0] == PackageManager.PERMISSION_GRANTED;
                boolean permissionToStore = grantResults[1] == PackageManager.PERMISSION_GRANTED;
                if (permissionToRecord amp;amp; permissionToStore) {
                    Toast.makeText(getApplicationContext(), "Permission Granted", Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(getApplicationContext(), "Permission Denied", Toast.LENGTH_LONG).show();
                }
            }
            break;
    }
}

public boolean CheckPermissions() {
    //this method is used to check permission
    int result = ContextCompat.checkSelfPermission(getApplicationContext(), WRITE_EXTERNAL_STORAGE);
    int result1 = ContextCompat.checkSelfPermission(getApplicationContext(), RECORD_AUDIO);
    return result == PackageManager.PERMISSION_GRANTED amp;amp; result1 == PackageManager.PERMISSION_GRANTED;
}

private void RequestPermissions() {
    // this method is used to request the permission for audio recording and storage.
    ActivityCompat.requestPermissions(MainActivity.this, new String[]{RECORD_AUDIO, WRITE_EXTERNAL_STORAGE}, REQUEST_AUDIO_PERMISSION_CODE);
}


public void playAudio() {
    stopTV.setBackgroundColor(getResources().getColor(R.color.gray));
    startTV.setBackgroundColor(getResources().getColor(R.color.purple_200));
    playTV.setBackgroundColor(getResources().getColor(R.color.gray));
    stopplayTV.setBackgroundColor(getResources().getColor(R.color.purple_200));
    //for playing our recorded audio we are using media player class.
    mPlayer = new MediaPlayer();
    try {
        //below method is used to set the data source which will be our file name
        mPlayer.setDataSource(mFileName);
        //below method will prepare our media player
        mPlayer.prepare();
        //below method will start our media player.
        mPlayer.start();
        statusTV.setText("Recording Started Playing");
    } catch (IOException e) {
        Log.e("TAG", "prepare() failed");
    }


}

public void pauseRecording() {
    stopTV.setBackgroundColor(getResources().getColor(R.color.gray));
    startTV.setBackgroundColor(getResources().getColor(R.color.purple_200));
    playTV.setBackgroundColor(getResources().getColor(R.color.purple_200));
    stopplayTV.setBackgroundColor(getResources().getColor(R.color.purple_200));
    //below method will stop the audio recording.
    mRecorder.stop();
    //below method will release the media recorder class.
    mRecorder.release();
    mRecorder = null;
    statusTV.setText("Recording Stopped");

}

public void pausePlaying() {
    //this method will release the media player class and pause the playing of our recorded audio.
    mPlayer.release();
    mPlayer = null;
    stopTV.setBackgroundColor(getResources().getColor(R.color.gray));
    startTV.setBackgroundColor(getResources().getColor(R.color.purple_200));
    playTV.setBackgroundColor(getResources().getColor(R.color.purple_200));
    stopplayTV.setBackgroundColor(getResources().getColor(R.color.gray));
    statusTV.setText("Recording Play Stopped");

}

}
 

и журнал ошибок также есть

 2021-08-28 18:29:29.356 19444-19460/com.gtappdevelopers.camviewlibrary W/System: A resource failed to call close. 
2021-08-28 18:29:30.321 19444-19444/com.gtappdevelopers.camviewlibrary E/TAG: prepare() failed
2021-08-28 18:29:30.321 19444-19444/com.gtappdevelopers.camviewlibrary E/MediaRecorder: start called in an invalid state: 4
2021-08-28 18:29:30.321 19444-19444/com.gtappdevelopers.camviewlibrary D/AndroidRuntime: Shutting down VM
2021-08-28 18:29:30.327 19444-19444/com.gtappdevelopers.camviewlibrary E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.gtappdevelopers.camviewlibrary, PID: 19444
java.lang.IllegalStateException
    at android.media.MediaRecorder.start(Native Method)
    at com.gtappdevelopers.camviewlibrary.MainActivity.startRecording(MainActivity.java:110)
    at com.gtappdevelopers.camviewlibrary.MainActivity.access$000(MainActivity.java:24)
    at com.gtappdevelopers.camviewlibrary.MainActivity$1.onClick(MainActivity.java:55)
    at android.view.View.performClick(View.java:7448)
    at android.view.View.performClickInternal(View.java:7425)
    at android.view.View.access$3600(View.java:810)
    at android.view.View$PerformClick.run(View.java:28305)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:223)
    at android.app.ActivityThread.main(ActivityThread.java:7656)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
2021-08-28 18:29:30.351 19444-19444/com.gtappdevelopers.camviewlibrary I/Process: Sending signal. PID: 19444 SIG: 9
 

Could you help me, why did the Program crash?