Android Open Source - AndroidLocalStorage Local Storage






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Back to project page AndroidLocalStorage.

License

The source code is released under:

Apache License

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Java Source Code

package com.example.androidlocalstorage;
/*  www .j ava  2s  .c  o m*/
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

/**
 * {@link SQLiteOpenHelper} that is used as replacement of the localStorage of the webviews.
 * @details this class should not be used. Everything about the localStorage through the application is already handled in HTMLFragment.
 * @author Diane
 */
public class LocalStorage extends SQLiteOpenHelper {

  private static LocalStorage mInstance;
  
  /**
   * the name of the table 
   */
  public static final String LOCALSTORAGE_TABLE_NAME = "local_storage_table";
  
  /**
   * the id column of the table LOCALSTORAGE_TABLE_NAME
   */
  public static final String LOCALSTORAGE_ID = "_id";
  
  /**
   * the value column of the table LOCALSTORAGE_TABLE_NAME
   */
  public static final String LOCALSTORAGE_VALUE = "value";
  
  private static final int DATABASE_VERSION = 2;
  private static final String DATABASE_NAME = "local_storage.db";
  private static final String DICTIONARY_TABLE_CREATE = "CREATE TABLE " + LOCALSTORAGE_TABLE_NAME 
      + " (" + LOCALSTORAGE_ID + " TEXT PRIMARY KEY, "
      + LOCALSTORAGE_VALUE + " TEXT NOT NULL);";
  

  /**
   * Returns an instance of LocalStorage
   * @param ctx : a Context used to create the database
   * @return the instance of LocalStorage of the application or a new one if it has not been created before.
   */
  public static LocalStorage getInstance(Context ctx) {
    if (mInstance == null) {
      mInstance = new LocalStorage(ctx.getApplicationContext());
    }
    return mInstance;
  }


  private LocalStorage(Context context) {
    super(context,DATABASE_NAME,null,DATABASE_VERSION);
  }

  @Override
  public void onCreate(SQLiteDatabase db) {
    db.execSQL(DICTIONARY_TABLE_CREATE);
  }

  @Override
  public void onUpgrade(SQLiteDatabase db,int oldVersion, int newVersion) {
    Log.w(LocalStorage.class.getName(),
        "Upgrading database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data");
    db.execSQL("DROP TABLE IF EXISTS " + LOCALSTORAGE_TABLE_NAME);
    onCreate(db);
  }
}




Java Source Code List

com.example.androidlocalstorage.LocalStorage.java
com.example.androidlocalstorage.MainActivity.java
com.example.androidlocalstorage.MainFragment.java