语音重组助手类

Question

我正在做一个演讲重组项目。我有一个util类，它由三种方法组成:检查麦克风是否存在、检查麦克风的可用性和检查文本到语音的可用性。有人能检查我的密码吗？

public class MediaUtil {

    //returns whether a microphone exists
    public boolean getMicrophoneExists(Context context) {
        PackageManager packageManager = context.getPackageManager();
        return packageManager.hasSystemFeature(PackageManager.FEATURE_MICROPHONE);
    }

    //returns whether the microphone is available
    public static boolean getMicrophoneAvailable(Context context) {
        MediaRecorder recorder = new MediaRecorder();
        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
        recorder.setOutputFile(new File(context.getCacheDir(), "MediaUtil#micAvailTestFile").getAbsolutePath());
        boolean available = true;
        try {
            recorder.prepare();
        }
        catch (IOException exception) {
            available = false;
        }
        recorder.release();
        return available;
    }

    //returns whether text to speech is available
    public static boolean getTTSAvailable(Context context) {
        PackageManager packageManager = context.getPackageManager();
        Intent speechIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
        List<ResolveInfo> speechActivities = packageManager.queryIntentActivities(speechIntent, 0);
        if (speechActivities.size() != 0) return true;
        return false;
    }

Answer 1

• 返回布尔型如果(条件)返回true的模式；要避免返回false。返回条件；以更透明的方式实现同样的目标。在这种情况下，返回speechActivities.size() != 0；
• 测试和收购考虑到了这种情况:当你调用getMicrophoneAvailable时，它可能是可用的，但后来当你的应用程序真正需要它时，它已经被其他应用程序成功地声称了。这意味着没有必要对可用性进行测试。根据需要获取它:公共静态MediaRecorder getMicrophone(上下文上下文){.尝试{ recorder.prepare()；} catch (IOException异常){返回null；}返回记录器；}