Saving an ArrayList of custom objects in internal storage

Question

I have an ArrayList of RowItem where RowItem Class have following variables :

public class RowItem
{
   private Bitmap photo;
   private String photoURL ;
   private int online_status;
   private String name;
   private String last_seen;
   private int delete;
   //Getters and Setters ...
}

I want to save this ArrayList into internal storage. Here is the list of things I have already tried but aren't working :

Implemented exclusion strategy as indicated in here. Excluded Bitmap from saving as I am Lazy Loading Images From URLs to ListView. But I am still getting errors like :
```
 java.lang.RuntimeException: Unable to pause activity {com.awesome.clique/com.awesome.clique.Home}: java.lang.IllegalArgumentException: class android.text.BoringLayout declares multiple JSON fields named mPaint.
```
If I am saving in onPause() or onStop() using SharedPreferences(using gson) or Files.
Overridden methods of readObject and writeObject for RowIem class. But it still kept on giving the above error.

Now I am out of options now. I do now think that saving the ArrayList in SQLite database maybe feasible, but I do not know how to save this list into SQLite databse as I have no idea about SQLite and in a glance it seemed very complex. Please help me out.

Mike · Accepted Answer · 2013-12-08 10:49:49Z

1

I would suggest you to look at ORMLite, it will simplify how you work with SQLite.

Take a look at how I implemented a simple model here: https://github.com/slidese/BabyFeed/blob/master/src/se/slide/babyfeed/model/FeedLog.java

And have a look (at that same project) how you work with it, it pretty simple.

Your code would look something like this:

@DatabaseTable
public class RowItem
{
   @DatabaseField(generatedId = true)
   private int id;

   @DatabaseField
   private Bitmap photo;

   @DatabaseField
   private String photoURL;

   @DatabaseField
   private int online_status;

   @DatabaseField
   private String name;

   @DatabaseField
   private String last_seen;

   @DatabaseField
   private int delete;

   //Getters and Setters ...
}

And then:

DatabaseManager.getInstance().addRowItem(row);

You create these helper methods, for example a delete could look like this:

public void deleteRowItem(RowItem row) {
    try {
        getHelper().getRowDao().delete(row);
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

edited Dec 8, 2013 at 10:49

answered Dec 7, 2013 at 21:39

Mike

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10 Comments

SlashGeek Over a year ago

Can you tell me , how will I delete a particular row ?

Mike Over a year ago

It's a bit too much code to paste here. But you could look at how I'm working with it in the DatabaseManager and DatabaseHelper classes here: github.com/slidese/BabyFeed/blob/master/src/se/slide/babyfeed/…

SlashGeek Over a year ago

In your code there is a function for adding FeedLogs, its okay but I am a little puzzled that how will I delete a particular FeedLog or RowItem ? If you could just paste the function for delete only, that would be very helpful.

Mike Over a year ago

@SlashGeek I added a delete helper method to the answer.

SlashGeek Over a year ago

Hey I am getting a NullPointerException along with the following warnings : ": unable to find class referenced in signature (Lcom/j256/ormlite/dao/Dao;) VFY: unable to resolve interface method: Lcom/j256/ormlite/dao/Dao;.create (Ljava/lang/Object;)I". What is happening ?

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