Question

我正在尝试使用NotificationCompat为Android制作Notifications，但我遇到了一个问题：“错误：找不到符号”。这是我的NotificationService.java文件。我以为错误可能是由于导入引起的，但是我不确定，这个问题长期存在：（

package com.notifikacijas;
import android.util.Log;
import android.widget.Toast;

import android.content.Context;
import android.content.Intent;
import android.app.NotificationManager;
import android.app.NotificationChannel;
import android.app.Notification;
import android.app.PendingIntent;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import android.os.Build;
import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationManagerCompat;
import androidx.core.app.NotificationCompat.Builder;

public class NotificationService extends ReactContextBaseJavaModule {
  private ReactApplicationContext reactContext;

  public NotificationService(ReactApplicationContext reactContext) {
    super(reactContext);
    Log.i("NotificationService", "NotificationService Constructor");
    this.reactContext = reactContext;
    String CHANNEL_ID = "Kanaals";
    NotificationCompat.Builder = new NotificationCompat.Builder(this.reactContext, CHANNEL_ID)
    .setContentTitle("Virsraksts")
    .setContentText("Teksts");
  }

  @Override
  public String getName() {
    return "NotificationService";
  }
}

还有MainApplication.java

package com.notifikacijas;

import android.app.Application;
import android.content.Context;
import com.facebook.react.PackageList;
import com.facebook.react.ReactApplication;
import com.github.amarcruz.rnlog.RNLogPackage;
import com.facebook.react.ReactNativeHost;
import com.facebook.react.ReactPackage;
import com.facebook.soloader.SoLoader;
import java.lang.reflect.InvocationTargetException;
import java.util.List;

public class MainApplication extends Application implements ReactApplication {

  private final ReactNativeHost mReactNativeHost =
      new ReactNativeHost(this) {
        @Override
        public boolean getUseDeveloperSupport() {
          return BuildConfig.DEBUG;
        }

        @Override
        protected List<ReactPackage> getPackages() {
          @SuppressWarnings("UnnecessaryLocalVariable")
          List<ReactPackage> packages = new PackageList(this).getPackages();
          // Packages that cannot be autolinked yet can be added manually here, for example:
          packages.add(new NotificationService());
          return packages;
        }

        @Override
        protected String getJSMainModuleName() {
          return "index";
        }
      };

  @Override
  public ReactNativeHost getReactNativeHost() {
    return mReactNativeHost;
  }

  @Override
  public void onCreate() {
    super.onCreate();
    SoLoader.init(this, /* native exopackage */ false);
    initializeFlipper(this); // Remove this line if you don't want Flipper enabled
  }

  /**
   * Loads Flipper in React Native templates.
   *
   * @param context
   */
  private static void initializeFlipper(Context context) {
    if (BuildConfig.DEBUG) {
      try {
        /*
         We use reflection here to pick up the class that initializes Flipper,
        since Flipper library is not available in release mode
        */
        Class<?> aClass = Class.forName("com.facebook.flipper.ReactNativeFlipper");
        aClass.getMethod("initializeFlipper", Context.class).invoke(null, context);
      } catch (ClassNotFoundException e) {
        e.printStackTrace();
      } catch (NoSuchMethodException e) {
        e.printStackTrace();
      } catch (IllegalAccessException e) {
        e.printStackTrace();
      } catch (InvocationTargetException e) {
        e.printStackTrace();
      }
    }
  }
}

这是我的控制台错误输出。

/home/arturo/Notifikacijas/android/app/src/main/java/com/notifications/NotificationService.java:18: error: cannot find symbol
  private ReactApplicationContext reactContext;
          ^
  symbol:   class ReactApplicationContext
  location: class NotificationService
/home/arturo/Notifikacijas/android/app/src/main/java/com/notifications/NotificationService.java:20: error: cannot find symbol
  public NotificationService(ReactApplicationContext reactContext) {
                             ^
  symbol:   class ReactApplicationContext
  location: class NotificationService
/home/arturo/Notifikacijas/android/app/src/main/java/com/notifications/NotificationService.java:25: error: cannot find symbol
    NotificationCompat.Builder = new NotificationCompat.Builder(this.reactContext, CHANNEL_ID)
                      ^
  symbol:   variable Builder
  location: class NotificationCompat
/home/arturo/Notifikacijas/android/app/src/main/java/com/notifikacijas/MainApplication.java:28: error: constructor NotificationService in class NotificationService cannot be applied to given types;
          packages.add(new NotificationService());
                       ^
  required: ReactApplicationContext
  found: no arguments
  reason: actual and formal argument lists differ in length

期待一些帮助，谢谢:) 反应本机：0.61.5

编辑:: 修复了该问题，现在在添加displayNotification（）之后，它的构建没有错误，但是一直在我尝试启动它时说NotificationApp停止工作。

  public void displayNotification() {
  Intent intent = this.reactContext.getPackageManager().getLaunchIntentForPackage("lv.dtg");

  intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);

  Uri uri = intent.getData();

  Log.i("NotificationService", "URI "+uri.toString());
  PendingIntent pendingIntent = PendingIntent.getActivity(this.reactContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

  String CHANNEL_ID = "notificationsChannel";
  NotificationCompat.Builder builder = new NotificationCompat.Builder(this.reactContext, CHANNEL_ID);
  // builder.setSmallIcon(17301575);
  builder.setContentTitle("Objektā atrodas darbinieki");
  builder.setContentText("Vai vēlaties izreģistrēt darbiniekus no objekta?");
  builder.setPriority(NotificationCompat.PRIORITY_DEFAULT);
  builder.setContentIntent(pendingIntent);
  // builder.setAutoCancel(false);

  NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this.reactContext);
  notificationManager.notify(123, builder.build());
  }

反应本地运行Android错误，找不到符号

0 个答案: