如何轻松存储推文列表（状态）？

Question

I'm pulling a list of tweets using twitter4j. Here is my code:

private ResponseList<Status> favouritesSavedLocally;

ConfigurationBuilder builder = new ConfigurationBuilder();

builder.setOAuthConsumerKey(ConstantValues.TWITTER_CONSUMER_KEY);
builder.setOAuthConsumerSecret(ConstantValues.TWITTER_CONSUMER_SECRET);
builder.setOAuthAccessToken(SharedPref.getPrefKeyOauthToken());
builder.setOAuthAccessTokenSecret(SharedPref.getPrefKeyOauthSecret());
builder.setJSONStoreEnabled(true);
builder.setIncludeEntitiesEnabled(true);
builder.setIncludeMyRetweetEnabled(true);

AccessToken accessToken = new AccessToken(SharedPref.getPrefKeyOauthToken(), SharedPref.getPrefKeyOauthSecret());
Twitter twitter = new TwitterFactory(builder.build()).getInstance(accessToken);

try {
    favouritesSavedLocally = twitter.getFavorites();
} catch (TwitterException e) {
    e.printStackTrace();
}

Now this works fine... but the problem is I need to store this locally. Does anyone know what is the best way to store a Status (tweet) object? I've trie to store it in SQLite as a blob but I get this error when attempting to read from DB. This is how I tried to store it locally:

private static final String COLUMN_ID = "ID";
private static final String COLUMN_FAVOURITE_TWEET = "FAVOURITE_TWEET";

...

@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
    sqLiteDatabase.execSQL("create table " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT,FAVOURITE_TWEET BLOB) ");
}

...

public boolean addFavouriteStatus(byte[] status) {

    SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put(COLUMN_FAVOURITE_TWEET, status);

    long result = sqLiteDatabase.insert(TABLE_NAME, null, contentValues);

    if (result == -1) {
        return false;
    } else {
        sqLiteDatabase.close();
        return true;
    }
}

public Cursor getFavouriteStatuses() {

    SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
    Cursor result = sqLiteDatabase.rawQuery("select * from " + TABLE_NAME, null);

    return result;
}

I get this error when attempting to read the getFavoritesStatuses()

FATAL EXCEPTION: AsyncTask #2
Process: xxxxxxxx.clientfeed, PID: 11221
java.lang.RuntimeException: An error occurred while executing doInBackground()
    at android.os.AsyncTask$3.done(AsyncTask.java:309)
    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
    at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
    at java.lang.Thread.run(Thread.java:818)
Caused by: android.database.sqlite.SQLiteException: unknown error (code 0): INTEGER data in nativeGetBlob 
#################################################################
Error Code : 0 (SQLITE_OK)
Caused By : unknown error (code 0): INTEGER data in nativeGetBlob 
#################################################################
    at android.database.CursorWindow.nativeGetBlob(Native Method)
    at android.database.CursorWindow.getBlob(CursorWindow.java:416)
    at android.database.AbstractWindowedCursor.getBlob(AbstractWindowedCursor.java:45)
    at xxxxxxxx.ui.TwitterFeedListFragment$GetFavouritesLocalTweets.doInBackground(TwitterFeedListFragment.java:132)
    at xxxxxxxx.ui.TwitterFeedListFragment$GetFavouritesLocalTweets.doInBackground(TwitterFeedListFragment.java:120)
    at android.os.AsyncTask$2.call(AsyncTask.java:295)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    ... 4 more

NOTE: this how a tweet object looks like

{"id_str":"873961105277767680","coordinates":null,"in_reply_to_user_id_str":null,"source":"<a href=\"http:\/\/instagram.com\" rel=\"nofollow\">Instagram<\/a>","geo":null,"possibly_sensitive_appealable":false,"in_reply_to_user_id":null,"retweet_count":0,"user":{"default_profile_image":false,"screen_name":"klaussdeejay","profile_link_color":"0084B4","profile_background_color":"C0DEED","is_translator":false,"url":null,"profile_background_image_url":"http:\/\/pbs.twimg.com\/profile_background_images\/868651398\/9e71de37e9836eb30c0e171028a134d2.jpeg","statuses_count":704,"profile_text_color":"333333","profile_image_url_https":"https:\/\/pbs.twimg.com\/profile_images\/3601781438\/76e5351fe2de382e89486e86f6a3bc18_normal.jpeg","following":true,"profile_sidebar_border_color":"C0DEED","verified":false,"id":1396650608,"lang":"en","entities":{"description":{"urls":[]}},"profile_background_tile":false,"listed_count":3,"id_str":"1396650608","profile_sidebar_fill_color":"DDEEF6","profile_background_image_url_https":"https:\/\/pbs.twimg.com\/profile_background_images\/868651398\/9e71de37e9836eb30c0e171028a134d2.jpeg","protected":false,"translator_type":"none","utc_offset":null,"is_translation_enabled":false,"profile_use_background_image":true,"notifications":false,"geo_enabled":false,"friends_count":366,"default_profile":false,"followers_count":54,"profile_image_url":"http:\/\/pbs.twimg.com\/profile_images\/3601781438\/76e5351fe2de382e89486e86f6a3bc18_normal.jpeg","follow_request_sent":false,"contributors_enabled":false,"has_extended_profile":false,"description":"","time_zone":null,"location":"London, UK","name":"Claudiu Farcas ","created_at":"Thu May 02 08:46:07 +0000 2013","favourites_count":47},"favorited":false,"in_reply_to_status_id":null,"in_reply_to_status_id_str":null,"truncated":false,"favorite_count":0,"id":873961105277767680,"is_quote_status":false,"contributors":null,"lang":"en","possibly_sensitive":false,"entities":{"urls":[{"indices":[20,43],"display_url":"instagram.com\/p\/BVNVW5VlNo-\/","expanded_url":"https:\/\/www.instagram.com\/p\/BVNVW5VlNo-\/","url":"https:\/\/t.co\/ngy7BtnvhP"}],"hashtags":[],"user_mentions":[],"symbols":[]},"text":"Just posted a photo https:\/\/t.co\/ngy7BtnvhP","created_at":"Sun Jun 11 17:52:19 +0000 2017","place":null,"in_reply_to_screen_name":null,"retweeted":false}

Thank you in advance!

Answer 1

In twitter4j, Status is actually an Interface , but since lots of twitter4j interfaces are based on JSON you can convert Status to JSON string and vice versa. You can just save your Status as String.

In order to do this, first set JSON Store to enabled in your Configuration and set it:

ConfigurationBuilder cb = ConfigurationBuilder();
...
cb.setJSONStoreEnabled(true);
Configuration configuration = cb.build();
// Setup configuration

And you can start converting them:

String json = TwitterObjectFactory.getRawJSON(status); // Status -> JSON String

or

Status status = TwitterObjectFactory.createStatus(json); // JSON String -> Status

so now you can save Status as String in your database.

For setting Configuration with ConfigurationBuilder , read here:

• http://twitter4j.org/en/configuration.html#builderconfiguration

Also check out some twitter4j documentations:

• Status - http://twitter4j.org/javadoc/twitter4j/Status.html
• TwitterObjectFactory - http://twitter4j.org/javadoc/twitter4j/TwitterObjectFactory.html