Question

I should start off by noting I am extremely new to Android Development so sorry if my question seems dumb. I am trying to query my SQLite Database in the application to dynamically create the content on the activity. Here is the query in my Database Helper file

    public Cursor getWhereToEatActivity (int LocationId)
{
    Cursor cursor = myDataBase.rawQuery("SELECT Location.locationId as _id,Location.title,Location.desc, location.address, location.hours, location.website, location.phone FROM " +
            "TripWhereToEat JOIN Trip ON TripWhereToEat.tripId = Trip.tripId JOIN Location ON " +
            "Location.locationId = TripWhereToEat.locationId where TripWhereToEat.tripId = ?",
            new String[] {Integer.toString(LocationId)});

    cursor.moveToFirst();
    return cursor;
}

Here is where the item is selected:

 @Override
              public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {

                LocationListitem locationItem = (LocationListitem)lvItems.getItemAtPosition(position);

                int locationId = locationItem.getLocationId();

                // Pass the ID into the next activity
                Map<String, String> parms = new HashMap<String, String>();
                parms.put("locationId", Integer.toString(locationId));
                if (listType.equals("whattosee")) {
                    // switchActivity(WhatToSeeActivity.class, parms);
                }
                if (listType.equals("wheretostay")) {
                    // switchActivity(WhereToStayActivity.class, parms);
                }
                if (listType.equals("wheretoeat")) {
                    switchActivity(WhereToEatActivity.class, parms);
                }
              }
            });

And here is the activity is switches to:

public class WhereToEatActivity extends FragmentActivityBase {

private int LocationId;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_where_to_eat);

    AndroidApplication app = (AndroidApplication)getApplication();

    DatabaseHelper myDbHelper = app.getDatabase(); // new DatabaseHelper(this);

    LocationId = Integer.valueOf(this.getParam("LocationId"));

    Cursor tripRecord = myDbHelper.getWhereToEatActivity(LocationId);

    tripRecord.moveToFirst();

    if (!tripRecord.isAfterLast()) {
        String name = tripRecord.getString(tripRecord.getColumnIndex("title"));
        String title = tripRecord.getString(tripRecord.getColumnIndex("desc"));
        String image = tripRecord.getString(tripRecord.getColumnIndex("image"));
        String address = tripRecord.getString(tripRecord.getColumnIndex("address"));

        ImageView mainImageView = (ImageView)findViewById(R.id.image);
        int resId = getResources().getIdentifier("com.integrativelogic.roadtrip:drawable/"+image, null, null); 
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),resId);
        if (bitmap != null)
            mainImageView.setImageBitmap (bitmap);    

        TextView nameView = (TextView)findViewById(R.id.name);
        nameView.setText(name);

        TextView titleView = (TextView)findViewById(R.id.title);

        titleView.setText(Html.fromHtml(title));
        titleView.setMovementMethod(LinkMovementMethod.getInstance());

        TextView addressView = (TextView)findViewById(R.id.address);
        addressView.setText(address);
    }

    tripRecord.close();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}
}

And this is the error I get from Logcat:

01-12 11:23:52.186: E/AndroidRuntime(15238): FATAL EXCEPTION: main
01-12 11:23:52.186: E/AndroidRuntime(15238): java.lang.RuntimeException: Unable to start  activity ComponentInfo{com.integrativelogic.roadtrip/com.integrativelogic.roadtrip.WhereToEatActivity}: java.lang.NumberFormatException: unable to parse '' as integer
01-12 11:23:52.186: E/AndroidRuntime(15238):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1821)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1842)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at android.app.ActivityThread.access$1500(ActivityThread.java:132)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at android.os.Looper.loop(Looper.java:150)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at android.app.ActivityThread.main(ActivityThread.java:4263)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at java.lang.reflect.Method.invokeNative(Native Method)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at java.lang.reflect.Method.invoke(Method.java:507)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at dalvik.system.NativeStart.main(Native Method)
01-12 11:23:52.186: E/AndroidRuntime(15238): Caused by: java.lang.NumberFormatException: unable to parse '' as integer
01-12 11:23:52.186: E/AndroidRuntime(15238):    at java.lang.Integer.parseInt(Integer.java:362)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at java.lang.Integer.parseInt(Integer.java:332)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at java.lang.Integer.valueOf(Integer.java:506)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at com.integrativelogic.roadtrip.WhereToEatActivity.onCreate(WhereToEatActivity.java:27)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
01-12 11:23:52.186: E/AndroidRuntime(15238):    at     android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1785)

Answer 1

as you’re new I’ll explain a bit on the debugging process when you have a sudden crash of your app like this:

1st part is read the last few lines of the LogCat output:

Caused by: java.lang.NumberFormatException: unable to parse ” as integer

so we know that is a problem trying to make an empty string be an integer. You can only create an integer from a String that contains numbers.

a few lines below that one on the Log you’ll see

at com.integrativelogic.roadtrip.WhereToEatActivity.onCreate(WhereToEatActivity.java:27)

so then we know that it happens on the line 27 of your WhereToEatActivity, I’m not gonna count the lines of what you posted here but I’m assuming it’s this line

LocationId = Integer.valueOf(this.getParam("LocationId"));

so I guess it’s safe to assume that the reason you’re having this error is because there is no parameter “LocationId” or the parameter is empty.