Android 13已授予通知权限但通知仍不显示问题排查

将原本在Android 7上正常运行的应用迁移至Android 13后，通知无法弹出。已按要求申请并成功获取POST_NOTIFICATIONS权限，但调用showNotification方法后通知仍不显示，无报错信息，该问题在模拟器和真机上均存在。相关源码片段如下：

public class MyActivity extends AppCompatActivity {

    private static final String CHANNEL_ID = "12345";
    public static final int NEWS_NOTIFICATION_ID = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
            ...
            // Prompt user to permit notifications
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
              if (!shouldShowRequestPermissionRationale(String.valueOf(PERMISSION_REQUEST_CODE))){
                getNotificationPermission();
              }
            }

        }

        ...

        public void getNotificationPermission(){
          try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
                ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.POST_NOTIFICATIONS},
                    PERMISSION_REQUEST_CODE);
            }
          } catch (Exception e) {
            Log.e(TAG, "Unable to request permission", e);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == PERMISSION_REQUEST_CODE) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Log.d("Permission is granted in onRequestPermissionsResult()");
            } else {
                Log.d("Permission is not granted in onRequestPermissionsResult()");
            }
        }

        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    }


    private void showNotification(String msg) {
        Intent resultIntent = new Intent(getApplicationContext(), MyActivity.class);
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(getApplicationContext());
        stackBuilder.addNextIntentWithParentStack(resultIntent);
        PendingIntent resultPendingIntent=null;
        resultPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_MUTABLE);

        Notification notification = new NotificationCompat.Builder(getApplicationContext(), CHANNEL_ID)
            .setTicker("ticker")
            .setSmallIcon(R.drawable.app_icon90x90)
            .setContentTitle(msg)
            .setContentText("").setContentIntent(resultPendingIntent)
            .setAutoCancel(true)
            .build();
        NotificationManager notificationManager = (NotificationManager) getApplicationContext().getSystemService(NOTIFICATION_SERVICE);
        notificationManager.notify(NEWS_NOTIFICATION_ID, notification);
    }

    ...
}

• 缺失通知渠道创建逻辑：Android 8.0（API 26）及以上版本要求所有通知必须归属到指定的通知渠道，未创建渠道的通知会被系统拦截。当前代码仅定义了CHANNEL_ID，但没有初始化渠道的步骤。
  新增渠道创建方法，并在onCreate或首次调用showNotification前执行：

  private void createNotificationChannel() {
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
          CharSequence channelName = "应用通知";
          String channelDesc = "接收应用推送通知";
          // 重要度设置为DEFAULT，确保通知能正常弹出
          int importance = NotificationManager.IMPORTANCE_DEFAULT;
          NotificationChannel channel = new NotificationChannel(CHANNEL_ID, channelName, importance);
          channel.setDescription(channelDesc);
          NotificationManager notificationManager = getSystemService(NotificationManager.class);
          notificationManager.createNotificationChannel(channel);
      }
  }
  

• 权限申请逻辑参数错误：shouldShowRequestPermissionRationale方法需要传入权限字符串（即Manifest.permission.POST_NOTIFICATIONS），而非请求码的字符串形式。当前代码的参数错误可能导致权限申请逻辑异常（即使你已成功授权，也建议修正以避免后续场景问题）。
  修正后的权限判断代码：

  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
      if (!shouldShowRequestPermissionRationale(Manifest.permission.POST_NOTIFICATIONS)) {
          getNotificationPermission();
      }
  }
  

• 通知内容为空：当前通知的setContentText("")设置了空文本，部分Android 13设备会过滤掉无实质内容的通知。建议设置非空的内容文本，例如：

  .setContentText("这是一条测试通知")
  

• 通知图标问题：检查R.drawable.app_icon90x90是否符合Android通知图标的规范（要求透明背景、单色，避免复杂图案），不符合规范的图标可能导致通知无法正常显示。

内容的提问来源于stack exchange，提问作者ka3ak