Android Album Art GridView Question

Question

I am new to Android development, and I am working on a media player app as a learning experience. I am currently trying to add a menu view that utilizes album art in a gridview. Here is my code:

public class coverMenu extends Activity {

 private Cursor audioCursor;
 public String artistInput;
 private static final String TAG = "coverMenu";

 @Override
 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setContentView(R.layout.cover);
        Bundle data = this.getIntent().getExtras();
        String artistKey = data.getString("artistPass");


       Toast.makeText(this, artistKey, Toast.LENGTH_LONG).show();

       audioCursor = getContentResolver().query(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null, 
         MediaStore.Audio.Albums.ARTIST + "='" + artistKey + "'", null,MediaStore.Audio.Albums.ALBUM + " ASC");
        startManagingCursor(audioCursor);

        String[]from = new String[]{MediaStore.Audio.Albums.ALBUM_ART};


        int[] to = new int []{android.R.id.text1};

        ListAdapter mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1,
          audioCursor, from, to);
        GridView gridview = (GridView) findViewById(R.id.gridview);
         gridview.setAdapter(mAdapter);

My problem is that the grid item now lists the path to the art, but does not show it. Can anyone help me by explaining how to parse this into a bitmap and send it to the gridview?

I have spent some time looking at the stock Android music player, but cannot find a simple solution to this.

Any help is appreciated.

[Latest Debug:]

DalvikVM[localhost:8615]
Thread [<3> main] (Suspended (exception RuntimeException))
ActivityThread.performLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2496
ActivityThread.handleLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2512
ActivityThread.access$2200(ActivityThread, ActivityThread$ActivityRecord, Intent) line: 119 ActivityThread$H.handleMessage(Message) line: 1863
ActivityThread$H(Handler).dispatchMessage(Message) line: 99 Looper.loop() line: 123 ActivityThread.main(String[]) line: 4363
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]
Method.invoke(Object, Object...) line: 521
ZygoteInit$MethodAndArgsCaller.run() line: 860
ZygoteInit.main(String[]) line: 618 NativeStart.main(String[]) line: not available [native method]
Thread [<13> Binder Thread #2] (Running)
Thread [<11> Binder Thread #1] (Running)
Thread [<15> Binder Thread #3] (Running)

Answer 1

You need to create a custom adapter class that returns a populated grid view item based on the cursor's position. Here's a pretty crude example.

custom_grid_item.xml:

<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"&gt;
<ImageView android:id="@+id/album_image"
android:layout_height="wrap_content" android:layout_width="wrap_content">
</ImageView>
</LinearLayout>

MySimpleListAdapter.java:

import java.io.File;
import android.content.Context;
import android.database.Cursor;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.SimpleCursorAdapter;
import android.widget.ImageView.ScaleType;

public class MySimpleListAdapter extends SimpleCursorAdapter {

private Context mContext;

public MySimpleListAdapter(Context context, int layout, Cursor c,
        String[] from, int[] to) {
    super(context, layout, c, from, to);
    mContext = context;
}

public View getView(int position, View convertView, ViewGroup parent) {
    View v;
    ImageView iv;
    if (convertView != null)
        v = convertView;
    else {
        LayoutInflater layout = LayoutInflater.from(mContext);
        v = layout.inflate(R.layout.custom_grid_item, null);
    }

    this.getCursor().moveToPosition(position);

    iv = (ImageView) v.findViewById(R.id.album_image);

    iv.setImageURI(Uri.fromFile(new File(this.getCursor().getString(9))));
    iv.setScaleType(ScaleType.CENTER_INSIDE);
    return v;

}}

Activity:

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.GridView;
import android.widget.Toast;

public class CoverMenu extends Activity {
private Cursor audioCursor;
public String artistInput;
private static final String TAG = "coverMenu";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

// Set to some artist you know
String artistKey = "Devo";

Toast.makeText(this, artistKey, Toast.LENGTH_LONG).show();

audioCursor = getContentResolver().query(
        MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null,
        MediaStore.Audio.Albums.ARTIST + "='" + artistKey + "'", null,
        MediaStore.Audio.Albums.ALBUM + " ASC");
startManagingCursor(audioCursor);

String[] from = new String[] { MediaStore.Audio.Albums.ALBUM_ART };

int[] to = new int[] { android.R.id.text1 };

MySimpleListAdapter mAdapter = new MySimpleListAdapter(this,
        android.R.layout.simple_list_item_1, audioCursor, from, to);

GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(mAdapter);
}}

Check out this nice video from Google I/O on creating custom listviews, it will be a big help to you in the future.

Answer 2

Yes, all activities are included in the AndroidManifest. Not sure where you would like for me to hit continue above.... When running the emulator in debug and clicking on the artist name in the lead-in menu the program stalls, and Eclipse opens a new tab reading: ActivityThread.performLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2496 . The emulator then switches to a totally black screen and that's the end.

Sorry for being such a noob.

Josh