Android, create and populate SQLite database using InsertHelper and Assets

I am new to Android development and would like to create and pre-populate a SQLite database using csv files from the Assets folder. I am using a database adapter class and in the onCreate method after creating the database I want to read the csv file fromt the assets folder and use it to insert rows using DatabaseUtils.InsertHelper.

import android.database.DatabaseUtils.InsertHelper; 
//... 

public void onCreate(SQLiteDatabase db) {
    db.execSQL(DATABASE_CREATE);

    // need to read the path csv data here containing columns "_id" and "path"

    try {
        InputStream is = getAssets().open("pathcsv"); 

        int size = is.available();

        // Read the entire asset into a local byte buffer.
        byte[] buffer = new byte[size];
        is.read(buffer);
        is.close();

        // Convert the buffer into a string.
        String text = new String(buffer);

    } catch (IOException e) {
        // Should never happen!
 开发者_运维百科       throw new RuntimeException(e);
    }


    // Create a single InsertHelper to handle this set of insertions. 
    InsertHelper ih = new InsertHelper(db, "path_table"); 

    // Get the numeric indexes for each of the columns that we're updating 
    final int id_Column = ih.getColumnIndex("_id"); 
    final int path_Column = ih.getColumnIndex("path"); 

    while (moreRowsToInsert) { 
        // ... Create the data for this row (not shown) ... 

        // Get the InsertHelper ready to insert a single row 
        ih.prepareForInsert(); 

        // Add the data for each column 
        ih.bind(id_Column, idData); 
        ih.bind(path_Column, pathData); 

        // Insert the row into the database. 
        ih.execute(); 
    } 
} 
//... 


} 

I am getting an eclipse error on the getAssets() line saying :

-The method getAssets() is undefined for the type DatabaseHelper 

I can't seem to get context working at all, any help would be appreciated.

Update:

I should have included all of the code, which is :

private static class DatabaseHelper extends SQLiteOpenHelper {

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

    @Override
    public void onCreate(SQLiteDatabase db) {
           db.execSQL(PATH_TABLE_CREATE);
           try {
               InputStream is = getAssets().open("@string/path");  

    // the rest is as in my first post above.... 

If I add in a context as follows I get an error:

private static class DatabaseHelper extends SQLiteOpenHelper {

    private Context myContext; 

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

    @Override
    public void onCreate(SQLiteDatabase db, Context context) {
           db.execSQL(PATH_TABLE_CREATE);
           myContext = context; 
           try {
               InputStream is = myContext.getAssets().open("@string/path");  

    // the rest is as in my first post above.... 

The error I get is:

The method onCreate(SQLiteDatabase, Context) of type DQDbAdapter.DatabaseHelper must   override or implement a supertype method 

Please can you help me to resolve this error. Thanks

Do you need to populate the database in your app, or could you prepare it ahead of time? See here:

Populate Android Database From CSV file?

If you really want to do what you're trying to do in the code you posted, you could do something like this:

public class DatabaseHelper extends SQLiteOpenHelper {
...
    private Context context;

    DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        this.context = context;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        ...
        context.getAssets()...
    }