Question

我必须在我的android应用中保存通知以备将来使用。我在Google上观看了youtube视频，但没有找到解决我的问题的方法。因此，我要求提供一些解决此问题的提示！！

Answer 1

您可以使用SQLite将通知存储在本地数据库中。

基本上您可以做的是：

创建一个助手以在SQLite数据库中创建一个表：

 import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteOpenHelper;


public class DatabaseHelper extends SQLiteOpenHelper {

  //Database Name
  private static final String DATABASE = "myDatabaseName";

  //Database Version
  public static int VERSION = 1;

  //Database tables
  private static final String TABLE_NOTIFICATIONS = "notifications";

  //Notification fields
  private static final String KEY_ID = "id";

  //Notifications Table
  private static final String KEY_DESCRIPTION = "description";

  public DatabaseHelper(Context context){
    super(context, DATABASE, null, VERSAO);
  }

  @Override
  public void onCreate(SQLiteDatabase db) {

    String CREATE_NOTIFICATIONS_TABLE = "CREATE TABLE " + TABLE_NOTIFICATIONS + "(" +
            KEY_ID + " INTEGER PRIMARY KEY, "
            + KEY_DESCRIPTION + " VARCHAR(255) "
            +");";

    db.execSQL(CREATE_NOTIFICATIONS_TABLE);
  }

  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    db.execSQL("DROP TABLE IF EXISTS " + TABLE_NOTIFICATIONS);

    onCreate(db);
  }
}

为其创建bean：

       public class NotificationBean {

          private String description;

          public String getDescription() {
            return description;
          }

          public void setDescription(String description) {
            this.description = description;
          }
      }

我还建议创建一个DAO以完成整个过程：

    import android.content.ContentValues;
    import android.content.Context;
    import android.database.Cursor;
    import android.database.sqlite.SQLiteDatabase;

    import com.yourpackage.beans.NotificationBean;
    import com.yourpackage.helpers.DatabaseHelper;

    import java.util.ArrayList;
    import java.util.List;

    public class NotificationDao {

        private DatabaseHelper helper;
        private SQLiteDatabase database;
        private ContentValues contentValues;

        public NotificationDao(Context context){
            helper = new DatabaseHelper(context);
        }

        private SQLiteDatabase getDatabase(){
            if(database == null){
                database = helper.getWritableDatabase();
            }
            return database;
        }
        public void close(){
            helper.close();
        }

        public void addNotification(NotificationBean notificationBean){
            contentValues = new ContentValues();
            contentValues.put("description", notificationBean.getDescription());
            getDatabase().insert("notifications", null, contentValues);
        }

        public List<NotificationBean> getNotifications(){
            List<NotificationBean> notificationBeanList = new ArrayList<>();
            final String SELECT_QUERY = "SELECT description FROM notifications";
            Cursor cursor = getDatabase().rawQuery(SELECT_QUERY, null);

            if(cursor.moveToFirst()){
                do{
                    NotificationBean notificationBean = new NotificationBean();
                    notificationBean.setDescription(cursor.getString(0));
                    notificationBeanList.add(notificationBean);
                }while (cursor.moveToNext());
            }
            return notificationBeanList;
        }
    }

创建后，只需在通知服务中调用它即可

public class NotificationsListenerService extends FirebaseMessagingService {

private NotificationDao notificationDao;
private NotificationBean notificationBean;

@Override
public void onMessageReceived(RemoteMessage message) {

    //Saving notification on database

    notificationDao = new NotificationDao(NotificationsListenerService.this);
    notificationBean = new NotificationBean();
    notificationBean.setDescription(message.getNotification().getBody());
    notificationDao.addNotification(notificationBean);
 }
}

请记住，您可以为表添加任何想要的字段，这只是我在某些项目中使用的。但是，您也可以添加created_at字段，以跟踪添加通知的日期。

就是这样，如果您还有其他疑问，请告诉我

如何保存应用程序中Firebase推送通知的接收通知以备将来使用？

1 个答案: