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idint 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idString 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idString 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
<serviceandroid:priority="1000"+ android:foregroundServiceType="microphone"android:name=".server.BoService" />END~