Question

I’m trying to display a selected item in a listview, populated with SQLite in another activity, but when i make the rawQuery, using the _id row identifier to show it the item in the other activity, but does not send any results, leads me to the other activity, but did not shows anything in the xml layout, i don’t know if i’m doing correctly my declaration of rawQuery, this is my search code and my handler to show it:

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.course_details);

    courseId = getIntent().getIntExtra("COURSE_ID", 0);
    SQLiteDatabase db = (new DBHelper(this)).getWritableDatabase();
    Cursor cursor = db.rawQuery("SELECT emp._id, emp.title, emp.instructor, emp.length, emp.rating, emp.topic, emp.subject, emp.description, mgr._id managerId, mgr.title managerTitle FROM courses emp LEFT OUTER JOIN courses mgr ON emp.title = mgr._id WHERE emp._id = ?", 
            new String[]{""+courseId});


    if (cursor.getCount() == 1)
    {
            cursor.moveToFirst();

            tTitle = (TextView) findViewById(R.id.tTitle);
            tTitle.setText(cursor.getString(cursor.getColumnIndex("title")));

            tInstructor = (TextView) findViewById(R.id.tInstructor);
            tInstructor.setText(cursor.getString(cursor.getColumnIndex("instructor")));

            tLength = (TextView) findViewById(R.id.tLength);
            tLength.setText(cursor.getString(cursor.getColumnIndex("length")));

            tRating = (TextView) findViewById(R.id.tRating);
            tRating.setText(cursor.getString(cursor.getColumnIndex("rating")));

            tTopic = (TextView) findViewById(R.id.tTopic);
            tTopic.setText(cursor.getString(cursor.getColumnIndex("topic")));

            tSubject = (TextView) findViewById(R.id.tSubject);
            tSubject.setText(cursor.getString(cursor.getColumnIndex("subject")));

            tDescription = (TextView) findViewById(R.id.tDescription);
            tDescription.setText(cursor.getString(cursor.getColumnIndex("description")));

    }
    db.close();
    cursor.close();
    return; 
}}

this is the class that shows the listview and performs the Intent:

public class lay_main extends ListActivity {
public ListView list;
public DBHelper myAdap;
protected SQLiteDatabase db;
public Cursor cursor;
DBHelper Context;
DBHelper ArrayList;

//adapter cAdapter class
protected ListAdapter adapter;

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

    collectXML();
    setupDataBase();
    setupAdapter();            
}      
private void collectXML() 
{
     list = (ListView)findViewById(android.R.id.list);  

}

public void setupDataBase() {
    myAdap = new DBHelper(getApplicationContext());
    myAdap.insertCourses();     

}

public void setupAdapter()
{
if(myAdap.getCourses()!=null)
    {
    adapter = new  cAdapter(this, R.layout.list_courses, myAdap.getCourses());
    list.setAdapter(adapter);
    }   
}
public void onListItemClick(ListView parent, View view, int position, long id) 
 {
        super.onListItemClick(parent, view, position, id);
        Intent intent = new Intent(this, CourseDetails.class);
        Courses course = (Courses) adapter.getItem(position);
        intent.putExtra("COURSE_ID", course.title);
        startActivity(intent);  
 }}

really would appreciate your help.

Answer 1

You can send your data over an bundle:

Bundle sendBundle = new Bundle();
    sendBundle.putString("COURSE_ID", course.title); //or use putInt if course.title is int type
    //sendBundle.putInt("COURSE_ID", course.title);
    Intent i = new Intent(lay_main.this, CourseDetails.class);
    i.putExtra("testBundle", sendBundle);
    startActivity(i);

and recieve it like:

Bundle receiveBundle = this.getIntent().getBundleExtra("testBundle");
    if (receiveBundle != null){
        String courseId = receiveBundle.getString("COURSE_ID");     
        //or int courseId = receiveBundle.getInt("COURSE_ID");     
        }