java - 录音机状态无效(文件路径错误？)

Question

我有一个录音机，我正在尝试制作它来测试它并看看它是如何工作的。但是，当我运行它时，我收到错误:

E/MediaRecorder: start called in an invalid state: 4

所以我做了一些 googlejitzu 并发现我的文件路径是错误的。这是我的代码:

final MediaRecorder recorder = new MediaRecorder();
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    recorder.setOutputFile("Test");

    System.out.println("Hello");
    try {
        recorder.prepare();
    } catch (IOException e) {
        e.printStackTrace();

    }
    recorder.start();
    CountDownTimer countDownTimer = new CountDownTimer(30000, 1000) {
        @Override
        public void onTick(long l) {

        }

        @Override
        public void onFinish() {
            recorder.stop();
        }
    }.start();

所以我想我想知道如何在手机上创建一个文件路径目录来保存音频。

错误是:

    11-11 01:49:48.275 23703-23703/com.example.arege.dayatalisten W/System.err: java.io.FileNotFoundException: Test: open failed: EROFS (Read-only file system)
11-11 01:49:48.276 23703-23703/com.example.arege.dayatalisten W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:455)
        at java.io.RandomAccessFile.<init>(RandomAccessFile.java:247)
        at java.io.RandomAccessFile.<init>(RandomAccessFile.java:128)
        at android.media.MediaRecorder.prepare(MediaRecorder.java:834)
        at com.example.arege.dayatalisten.ListeningToTheWorld.onStartCommand(ListeningToTheWorld.java:47)
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3432)
        at android.app.ActivityThread.-wrap21(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1633)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6316)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)
    Caused by: android.system.ErrnoException: open failed: EROFS (Read-only file system)
11-11 01:49:48.277 23703-23703/com.example.arege.dayatalisten W/System.err:     at libcore.io.Posix.open(Native Method)
        at libcore.io.BlockGuardOs.open(BlockGuardOs.java:187)
        at libcore.io.IoBridge.open(IoBridge.java:441)
        ... 13 more

我拥有这两个必需的权限。

Answer 1

您正在尝试写入您的应用无权访问的内部存储。它不是 root 设备。

您需要将文件写入外部存储。

使用:getFilesDir() 或 getExternalFilesDir()(在上下文或 Activity 上)获取目录并将文件写入该位置。

伪代码:

File file = new File(context.getFilesDir(), "Test");
FileOutputStream outputStream = new FileOutputStream(file);
outputStream.write("contents".getBytes());
outputStream.close();