录制按钮在android录音应用程序中仅可使用一次

Question

我开发了一个可记录用户语音的android应用。 对我来说这是一个学习应用程序。 但是，问题在于，录音按钮只能工作一次，而当我第二次点击录音时，录音按钮根本无法停止。 共有四个按钮“记录-停止”记录。 停停播放。

确切的问题是，当按下第二次记录时，停止按钮保持为灰色。

我第三次按记录，应用程序直接崩溃。

package com.example.soundrecorder;

import android.Manifest;
import android.content.pm.PackageManager;
import android.content.pm.PermissionInfo;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Environment;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;
import java.util.UUID;

public class MainActivity extends AppCompatActivity {

    Button btnRecord, btnStopRecord, btnPlay, btnStop;

    String pathsave="";
    MediaRecorder mediaRecorder;
    MediaPlayer mediaplayer;

    final int REQUEST_PERMISSION_CODE=1000;


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

        //Request Runtime Permission
        if(!CheckPermissionFromDevice())
            requestPermissions();

        //init view
        btnPlay = (Button)findViewById(R.id.btnPlay);
        btnRecord = (Button)findViewById(R.id.btnStartRecord);
        btnStop = (Button)findViewById(R.id.btnStop);
        btnStopRecord = (Button)findViewById(R.id.btnStopRecord);


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

                                                 if(CheckPermissionFromDevice())

                                                 {

                                                 pathsave = Environment.getExternalStorageDirectory().getAbsolutePath()+"/"
                                                         + UUID.randomUUID().toString()+"_audio_record.3gp";
                                                 setupMediaRecorder();
                                                 try{
                                                     mediaRecorder.prepare();
                                                     mediaRecorder.start();

                                                 }catch (IOException e){
                                                     e.printStackTrace();
                                                     }
                                                     btnPlay.setEnabled(false);
                                                    btnStop.setEnabled(false);
                                                 Toast.makeText(MainActivity.this, "Recording...", Toast.LENGTH_SHORT).show();

                                                 }
                                                 else
                                                 {
                                                     requestPermissions();
                                                 }
                                             }
                                         });
            btnStopRecord.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View view) {
                    mediaRecorder.stop();
                    btnStopRecord.setEnabled(false);
                    btnPlay.setEnabled(true);
                    btnRecord.setEnabled(true);
                    btnStop.setEnabled(false);

                }
            });


        btnPlay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
            btnStop.setEnabled(true);
            btnStopRecord.setEnabled(false);
            btnRecord.setEnabled(false);

            mediaplayer = new MediaPlayer();
            try{
                mediaplayer.setDataSource(pathsave);
                mediaplayer.prepare();
            } catch (IOException e) {
                e.printStackTrace();
            }

            mediaplayer.start();
                Toast.makeText(MainActivity.this, "Playing...", Toast.LENGTH_SHORT).show();
            }
        });

        btnStop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                btnStopRecord.setEnabled(false);
                btnRecord.setEnabled(true);
                btnStop.setEnabled(false);
                btnPlay.setEnabled(true);

                if(mediaplayer !=null)
                {
                    mediaplayer.stop();
                    mediaplayer.release();
                    setupMediaRecorder();
                }

            }
        });


    }

    private void setupMediaRecorder() {
        mediaRecorder = new MediaRecorder();
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
        mediaRecorder.setOutputFile(pathsave);


    }

    private void requestPermissions()
{
    ActivityCompat.requestPermissions(this,new String[]{
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.RECORD_AUDIO,

    },REQUEST_PERMISSION_CODE );
}


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode)
        {
            case REQUEST_PERMISSION_CODE:
            {
                if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
                    Toast.makeText(this,"Permission Granted",Toast.LENGTH_SHORT).show();
                else
                {
                    Toast.makeText(this,"Permission Denied",Toast.LENGTH_SHORT).show();
                }
            }
                break;
        }
    }

    private boolean CheckPermissionFromDevice()
    {
        int write_external_storage_result = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        int record_audio_result = ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO);
        return write_external_storage_result == PackageManager.PERMISSION_GRANTED && record_audio_result == PackageManager.PERMISSION_GRANTED;

    }

}

Answer 1

似乎没有btnStopRecord.setEnabled(true); 在btnRecord单击功能中。 如果您可以停止第一个记录，则可能是因为默认情况下已启用“停止记录”按钮，但是当您按下它时，它会自行禁用。 您可能也应该初始化按钮的启用状态，但这应该可以解决您的问题：

public void onClick(View view) {

    if(CheckPermissionFromDevice())
        pathsave = Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+UUID.randomUUID().toString()+"_audio_record.3gp";
        setupMediaRecorder();
        try{
            mediaRecorder.prepare();
            mediaRecorder.start();
            btnStopRecord.setEnabled(true); //enable stop record
            btnPlay.setEnabled(false); //shouldn't be able to play while recording too
            btnRecord.setEnabled(false); //yours to see if should be able to restart record while recording, but probably not if it crashes
            btnStop.setEnabled(false); //probably should be disabled too on record

//...rest of the function