Question

I have a listView which loads data from SQLite database and right now I would want to implement an onclicklistener to the list. When users click on the list, it should bring them to the next activity and load the corresponding data into TextView. My question is how would I pass the data of the list for example it is a list of “Topics” and user click on the topic “My Home”. I want to pass the topic “My Home” to the next activity so that I know which corresponding data to be retrieved respectively.

How do I go about it? Do I “putExtras” to the new Intent? or there is another way. Below are part of my codes which display the listview:

ListView listContent = (ListView) findViewById(R.id.contentlist);
        mySQLiteAdapter = new SQLiteAdapter(this);
        mySQLiteAdapter.openToRead();

        Cursor cursor = mySQLiteAdapter.queueAll();
        startManagingCursor(cursor);

        String[] from = new String[] { SQLiteAdapter.KEY_CONTENT };
        int[] to = new int[] { R.id.text };

        SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, R.layout.listrow, cursor, from, to);

        listContent.setAdapter(cursorAdapter);

        mySQLiteAdapter.close();

        //Onclick ListView setlistener
        listContent.setTextFilterEnabled(true);
        listContent.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                Intent summaryIntent = new Intent(DocumentListActivity.this, ViewDocumentActivity.class);
//              summaryIntent.putExtra("SummTopic", value);
            }
        });

EDITED:
This part is on the next activity.

Intent i = getIntent();
        extraTopic = i.getStringExtra("SummTopic");

        mydb = openOrCreateDatabase(DBNAME, Context.MODE_PRIVATE,null);
        Cursor allrows  = mydb.rawQuery("SELECT * FROM "+  TABLE + " WHERE topic = \" " + extraTopic + " \" " , null);

        Integer cindex = allrows.getColumnIndex("topic");
        Integer cindex1 = allrows.getColumnIndex("text1");
        Integer cindex2 = allrows.getColumnIndex("text2");

I got an error while retrieving from database:

android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 0

Please help.

Thank you.

Answer 1

        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            Intent summaryIntent = new Intent(DocumentListActivity.this, ViewDocumentActivity.class);
            Cursor c = (Cursor)parent.getItemAtPosition(position);
            summaryIntent.putExtra("SummTopic", c.getString(c.getColumnIndex(SQLiteAdapter.KEY_CONTENT)));
            startActivity(summaryIntent);
        }

or you can pass id (summaryIntent.putExtra("SummTopicId", id);) of this row and “ask db” in next Activity for Topic with this id

EDIT:

protected void onCreate(Bundle savedInstanceState){
    Intent i = getIntent(); 
    String extraTopic = i.getStringExtra("SummTopic"); 
    //or long extraTopic = i.getLongExtra("SummTopic"); if you put id there (which is better)
        mydb = openOrCreateDatabase(DBNAME, Context.MODE_PRIVATE,null);
    String[] args = new String[] { extraTopic };
    //or String[] args = new String[] { Long.toString(extraTopic) }; with id version
        Cursor singleRow  = mydb.rawQuery("SELECT * FROM "+  TABLE + " WHERE topic=?" , args);
    //args is better then escaping special chars in query
    //and it should be single row so we've changed var name :)
    if(singleRow.moveToFirst()){ //we should do moveToFirst before we can use Cursor
        Integer cindex = allrows.getColumnIndex("topic");
        Integer cindex1 = allrows.getColumnIndex("text1");
        Integer cindex2 = allrows.getColumnIndex("text2");
        //setup views and stuff ....
    }else{
        Toast.makeText(this, "Oops we did not find topic, detail activity was closed", Toast.LENGTH_SHORT).show();
        finish();
    }
}