java.io.FileNotFoundException：打开失败：EACCES权限被拒绝，尝试使用JobIntentService进行记录

如何解决java.io.FileNotFoundException：打开失败：EACCES权限被拒绝，尝试使用JobIntentService进行记录

我正在尝试使用广播接收器和JobIntentService设置android通话记录器。但是，无论何时启动JobIntentService， Mediarecorder.prepare（）方法都会引发如下错误：

W/System.err: java.io.FileNotFoundException: /storage/emulated/0/Music/filename.3gp: open failed: EACCES (Permission denied)
W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:496)
W/System.err:     at java.io.RandomAccessFile.<init>(RandomAccessFile.java:289)
W/System.err:     at java.io.RandomAccessFile.<init>(RandomAccessFile.java:152)
W/System.err:     at android.media.MediaRecorder.prepare(MediaRecorder.java:1046)
W/System.err:     at com.example.callrecorder.Job.recordCall(Job.java:77)
W/System.err:     at com.example.callrecorder.Job.onHandleWork(Job.java:38)
W/System.err:     at androidx.core.app.JobIntentService$CommandProcessor.doInBackground(JobIntentService.java:392)
W/System.err:     at androidx.core.app.JobIntentService$CommandProcessor.doInBackground(JobIntentService.java:383)
W/System.err:     at android.os.AsyncTask$3.call(AsyncTask.java:378)
W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:266)
W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
W/System.err:     at java.lang.Thread.run(Thread.java:919)
W/System.err: Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied)
W/System.err:     at libcore.io.Linux.open(Native Method)
W/System.err:     at libcore.io.ForwardingOs.open(ForwardingOs.java:167)
W/System.err:     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:252)
W/System.err:     at libcore.io.ForwardingOs.open(ForwardingOs.java:167)
W/System.err:     at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:7255)
W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:482)
W/System.err:   ... 12 more
I/Try: java.io.FileNotFoundException: /storage/emulated/0/Music/filename.3gp: open failed: EACCES (Permission denied)
E/MediaRecorder: start called in an invalid state: 4
E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
    Process: com.example.callrecorder,PID: 10311
    java.lang.RuntimeException: An error occurred while executing doInBackground()
        at android.os.AsyncTask$4.done(AsyncTask.java:399)
        at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
        at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
        at java.util.concurrent.FutureTask.run(FutureTask.java:271)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:919)
     Caused by: java.lang.IllegalStateException
        at android.media.MediaRecorder.start(Native Method)
        at com.example.callrecorder.Job.recordCall(Job.java:82)
        at com.example.callrecorder.Job.onHandleWork(Job.java:38)
        at androidx.core.app.JobIntentService$CommandProcessor.doInBackground(JobIntentService.java:392)
        at androidx.core.app.JobIntentService$CommandProcessor.doInBackground(JobIntentService.java:383)
        at android.os.AsyncTask$3.call(AsyncTask.java:378)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:919)

JobIntentService的代码如下：

public class Job extends JobIntentService {
    static final int JOB_ID = 1000;
    String state;

    MediaRecorder mediaRecorder;

    static void enqueueWork(Context context,Intent intent) {
        enqueueWork(context,Job.class,JOB_ID,intent);
    }


    @Override
    protected void onHandleWork(@NonNull Intent intent) {
        Log.i("Job","Triggered");
        state = intent.getExtras().getString(TelephonyManager.EXTRA_STATE);
        switch (state) {
            case "OFFHOOK": {
                recordCall();
            }
            break;
            case "IDLE": {
                stopRecording();
            }
            break;
        }
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
    }


    private void stopRecording() {
        Log.i("Stato","Stopped");
        mediaRecorder.stop();
        mediaRecorder.release();
        mediaRecorder = null;
    }

    private void recordCall() {

        String recordPath = null;

        String path = Environment.getExternalStoragePublicDirectory(DIRECTORY_MUSIC).getAbsolutePath();
        File dir = new File(path);
        if(!dir.exists()) {
            dir.mkdirs();
        }
        String myFile = "filename.3gp";

        mediaRecorder = new MediaRecorder();
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mediaRecorder.setOutputFile(dir + "/" + myFile);
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        try {
            mediaRecorder.prepare();
        } catch (Exception e) {
            e.printStackTrace();
            Log.i("Try",String.valueOf(e));
        }
        mediaRecorder.start();
        Log.i("Stato","Started");
    }
}

此服务的意图是从广播接收器传递的，并且一切正常，如果我尝试通过删除媒体记录器部分进行检查。由于某种原因，每当我尝试启动媒体记录器时，它都会抛出错误，提示“权限被拒绝”。 我已在Android清单文件中授予 WRITE_EXTERNAL_STORAGE，READ_EXTERNAL_STORAGE，RECORD_AUDIO，READ_PHONE_STATE，PROCESS_OUTGOING_CALLS 权限。 作业服务和接收者也已注册。

解决方法

从Android 10开始，您需要旧版权限才能以旧方式访问存储或切换为使用新方法。 将此添加到Manifest中的应用程序下以用于旧版存储。

android:requestLegacyExternalStorage="true"

录音通话功能也已从android 10中停止，因此如果没有辅助功能选项，您将无法再在其上录音通话。