Question

我的问题很容易解释 - 我正在尝试创建一个AudioRecord对象，但它无法初始化（即在构造函数之后，getState返回0，表示失败）。我在运行OS 2.2.1的MotoDroid 1上从Eclipse运行它。我的AndroidManifest.xml是AFAIK，使用了正确的权限，RECORD_AUDIO（我不知道如何确认）：

<application android:icon="@drawable/icon" android:label="@string/app_name" android:debuggable="true">
    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
    <activity android:name=".SphinxMic"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

我执行以下操作来创建AudioRecord：

bufferSize = AudioRecord.getMinBufferSize(8000, CHANNEL_IN_MONO, ENCODING_PCM_8BIT);
audioRecorder = new AudioRecord(AudioSource.MIC, 8000, CHANNEL_IN_MONO, ENCODING_PCM_8BIT, 50*bufferSize);
if (audioRecorder.getState() != AudioRecord.STATE_INITIALIZED)
  throw new Exception("AudioRecord init failed");

audioRecorder.getState（）返回0（即STATE_UNINITIALIZED）

我还没有找到任何使用此API的完整示例，而且我非常喜欢Android初学者，所以解决方案可能很简单。我该怎么做才能找出失败的原因？

有些人提出了类似的问题，但他们肯定遇到了与我不同的问题，因为他们批准的修复措施对我没有帮助。最引人注目的是this。但批准的解决方案令人困惑，无论如何都不适用于我。我还尝试了各种比特率（8000,16000,11025,44100），单声道和立体声以及8和16比特。成功初始化后没有组合回来。

Answer 1

我花了几个小时来解决这个问题，并发现了移动

<uses-permission android:name="android.permission.RECORD_AUDIO" />

在应用程序块之外实际解决了它！

...
    </application>

    <uses-permission android:name="android.permission.RECORD_AUDIO" /> 
</manifest>

Answer 2

另一个可能的问题：

我在清单中启用了this.userEmailAddress = this.af.database.object('/users/'+this.authInfo.uid+'/emailAddress')权限，但对于API级别23，我还必须在运行时请求权限。

Answer 3

尝试16位。这对我有用：

try {
        // Create a new AudioRecord object to record the audio.
        bufferSize = AudioRecord.getMinBufferSize(frequency,channelConfiguration,audioEncoding);

        audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, 
                                                  frequency, channelConfiguration, 
                                                  audioEncoding, bufferSize);
    } catch (Throwable t) {
        Log.e("AudioRecord","Recording Failed");
    }

我设置了以下变量：

int frequency = 8000;
int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_MONO;
int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;

Answer 4

如果有人需要手动为API 23+请求磁盘权限，这是我使用过的一种方法。只需在相关位中交换permission.RECORD_AUDIO即可。方法逻辑取决于外部的一些位（例如strings.xml，ActivityCompat，Snackbar），但认为它可能对某人有帮助。

/**
 * Requests the Storage permissions.
 * If the permission has been denied previously,
 * a SnackBar will prompt the user to grant the
 * permission, otherwise it is requested directly.
 */
private void requestStoragePermissions() {

    // Newer versions Android 18+
    if (Build.VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR2) {
        /**
         * Permissions required to read and write storage.
         */
        final String[] PERMISSIONS_STORAGE = {
                permission.READ_EXTERNAL_STORAGE,
                permission.WRITE_EXTERNAL_STORAGE,
        };

        final boolean readResult =
                ActivityCompat.shouldShowRequestPermissionRationale(
                        this, permission.READ_EXTERNAL_STORAGE);
        final boolean writeResult =
                ActivityCompat.shouldShowRequestPermissionRationale(
                        this, permission.WRITE_EXTERNAL_STORAGE);

        if (readResult || writeResult) {

            // Provide an additional rationale to the user if the permission was not granted
            // and the user would benefit from additional context for the use of the permission.
            // For example, if the request has been denied previously.
            Log.i(TAG,
                    "Displaying disk permission rationale to provide additional context.");

            // Display a SnackBar with an explanation and a button to trigger the request.
            Snackbar.make(mainView, R.string.permission_storage_rationale,
                    Snackbar.LENGTH_INDEFINITE)
                    .setAction(R.string.ok, new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            ActivityCompat
                                    .requestPermissions(MainActivity.this,
                                            PERMISSIONS_STORAGE,
                                            REQUEST_STORAGE);
                        }
                    })
                    .show();
        } else {
            // Storage permissions have not been granted. Request them directly.
            ActivityCompat.requestPermissions(
                    this, PERMISSIONS_STORAGE, REQUEST_STORAGE);
        }

    }
}

Android AudioRecord初始化每次都失败

4 个答案: