Call drawable from Content Provider

Exeter · by **Exeter** » Tue Jan 05, 2010 1:11 am

Hi there. I'm hoping for a tutorial on how to dynamically pass an array of drawables (saved as string references in a table) from a Content Provider. Ideally, the Cursor would take the place of mThumbIds[position] below,

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  imageview.setImageResource(mThumbIds[position]);
 
    private Integer[] mThumbIds = {
 
    R.drawable.icon1,  R.drawable.icon2,  R.drawable.icon3,  R.drawable.icon4  
 
    }
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I've been wrestling with it for a while but my limited knowledge of Java presents a challenge.

Best Regards,

Exeter

Exeter · by **Exeter** » Tue Jan 05, 2010 6:18 pm

The following code is untested b/c I'm still debugging my ContentProvider. Nevertheless, the idea is to pull R.drawable references from an SQLite database and display them in an ImageView.

This example stores the ResourceName b/c ResourceIds aren't permanent (adding or removing drawables causes reallocation).

*** Content Provider (com.example.ImageProvider) not included***

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import android.app.Activity;
import android.database.Cursor;
import android.net.Uri;
import android.widget.BaseAdapter;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;
 
 
public class ImageAdapter extends BaseAdapter {
    private Context mContext;
 
    public ImageAdapter(Context c) {
        mContext = c;
    }
 
    public int getCount() {
        return cursor.getCount();
    }
 
    public Object getItem(int position) {
        return null;
    }
 
    public long getItemId(int position) {
        return 0;
    }
 
    //Get Dataset from Database
    Uri uri = com.example.ImageProvider.CONTENT_URI;
    String[] projection = new String[] { Constants.KEY_ID, Constants.KEY_IMG };
    String selection = null;
    String[] selectionArgs = null;
    String sortOrder = Constants.KEY_ID + " ASC";
    
    
        Activity activity = new Activity();    
        Cursor cursor = activity.managedQuery(uri, projection, // Which columns to return
                selection, // WHERE clause; which rows to return(all rows)
                selectionArgs, // WHERE clause selection arguments (none)
                sortOrder // Order-by clause (ascending by name)
                );
 
                //Cursor cursor =  activity.getContentResolver().query(uri,projection, selection, selectionArgs, sortOrder);
 
                Integer[] mThumbIds = CreateIntegerArray(mContext, cursor);
 
    // create a new ImageView for each item referenced by the Adapter
    public View getView(final int position, View convertView, ViewGroup parent) {
        ImageView imageview;
 
        if (convertView == null) {  // if it's not recycled, initialize some attributes
            imageview = new ImageView(mContext);
            imageview.setLayoutParams(new GridView.LayoutParams(30, 30));
            imageview.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageview.setPadding(0, 0, 0, 0);
            //cursor.moveToPosition(position);       
            
        imageview.setOnClickListener(new View.OnClickListener() {
 
        //      @Override
              public void onClick(View view){
 
                           Toast t;
                          t = Toast.makeText(mContext, "Image " + position + " selected", Toast.LENGTH_SHORT);
                           t.show();
                    }
                });
    }
          else {
            imageview = (ImageView) convertView;
          }
      
        imageview.setImageResource(mThumbIds[position]);
        return imageview;
    }
 
 
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Method to enumerate IntegerArray...

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    private Integer[] CreateIntegerArray(Context mContext, Cursor cursor){
                         int i = 0;
                         StringBuilder sb = new StringBuilder();
                    if (cursor != null) {
                    /* Check if at least one Result was returned. */
 
                       if (cursor.isBeforeFirst()) {
 
                         //cursor.moveToFirst();
                         /* Loop through all Results */
                             do {
                                  i++;
                                  int resID = mContext.getResources().getIdentifier(
cursor.getColumnIndex(Constants.KEY_IMG), "drawable", "com.example");
                                  sb.append(resID);   // Converts Row to string and appends to end.
                                  sb.append(",");     //  Array List that can be derived from a Cursor
                             } while (cursor.moveToNext());
                        } 
                    }
 
                         //Converts  Stringbuilder into Integer Array
                         Integer[] thumbIds = { Integer.parseInt(sb.toString())};
                         return thumbIds;
    }
 
}
 
 
}
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