Android13应用在后台录音无声音

最近在做项目，对讲应用放在后台，录音无声音，最后解决。

一 现象

对讲应用运行在后台，录音无效查看日志，AudioRecorder录音回调全是0；状态栏无通知，无申请通知权限。

二解决

看了现象应该能够猜测到解决方案了。让应用在后台运行不被挂起，需要申请通知权限，然后创建通知在状态栏显示，防止应用被挂起。

1 申请通知权限

AndroidManifest.xml中

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

2 代码检查权限

private final ActivityResultLauncher<String> requestPermissionLauncher = registerForActivityResult(
            new ActivityResultContracts.RequestPermission(),
            result -> {
                if (result == null || !result) {
                    // 用户不允许权限，处理拒绝的情况
                    ToastUtil.getInstance().show("请授予通知权限");
                } else {
                    // 用户允许权限，处理接受的情况

                }
            });

    @RequiresApi(api = Build.VERSION_CODES.TIRAMISU)
    public void requestPermission() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS) != PackageManager.PERMISSION_GRANTED) {
            // 权限未被授予，向用户请求权限
            requestPermissionLauncher.launch(Manifest.permission.POST_NOTIFICATIONS);
        } else {
            // 权限已经被授予，可以执行操作
        }
    }

3 创建通知栏 ，在service中创建

@SuppressLint("NotificationPermission")
    private void showMessageNotification(String data) {
        Log.e(TAG, "showMessageNotification data: " + data);

        String type = data.substring(0, 2);
        String a = ConvertUtil.convertBigModel(data.substring(2, 10));
        //短信发送方号码
        String number = String.valueOf(Long.parseLong(a, 16));
        //联系人号码
//        String b = ConvertUtil.convertBigModel(data.substring(10, 18));
//        String number1 = String.valueOf(Long.parseLong(b, 16));
        String text = ConvertUtil.unicodeToString(data.substring(10));

        Log.e(TAG, "showMessageNotification: " + data);
        // 为该通知设置一个id
        int notifyID = 1;

        daoManager = DaoManager.getInstance(this);
        smsLists = daoManager.querySmsList();
        if (smsLists != null && smsLists.size() > 0) {
            SmsList sms = daoManager.querySms(smsLists.get(smsLists.size() - 1).getId());
            notifyID = (int) (sms.getId() + 1);
        }

        int current = SPUtil.getInt(this, Constant.CHANNEL_INDEX, Constant.CHANNEL_INDEX_DEFAULT);
        list = new SmsList(notifyID, System.currentTimeMillis(), current, type, number, text, false);
        daoManager.insertSmsList(list);

        //创建通知
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            // 通知渠道的id
            String id = "my_channel_dmr_message";
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel mChannel = new NotificationChannel(id, number, importance);
            mChannel.setShowBadge(true);
            mChannel.setName(getString(R.string.message));
            mNotificationManager.createNotificationChannel(mChannel);

            //设置点击事件
            Intent clickIntent = new Intent(this, SmsActivity.class);
            clickIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            PendingIntent clearIntent = PendingIntent.getActivity(this, 0, clickIntent, PendingIntent.FLAG_IMMUTABLE);

            // 通知渠道的id
            String CHANNEL_ID = "my_channel_dmr_message";
            // Create a notification and set the notification channel.
            Notification notification = new Notification.Builder(this, CHANNEL_ID)
                    .setAutoCancel(true)
                    .setShowWhen(true)
                    .setContentIntent(clearIntent)
                    .setContentTitle(number)
                    .setContentText(text)
                    .setSmallIcon(R.drawable.icon_message)
                    .setChannelId(CHANNEL_ID)
                    .build();
            mNotificationManager.notify(notifyID, notification);
        }

       
    }

4 在AndroidManifest.xml中给service增加audioRecorder使用权限

 <service
            android:priority="1000"
          +  android:foregroundServiceType="microphone"
            android:name=".server.BoService" />

END~