Question

I’m trying to access an intent from a string variable that represents the intent’s name, nIntent.

Question: If I replace the variable nIntent with the QueryDisplay.class name, it fires correctly, but if I use a variable, why do I get the typical No Activity found to handle Intent { act=QueryDisplay.class (has extras) }?

I don’t get it because it works fine hard-coded (it’s in the manifest). Any ideas?

Thanks for your help.

lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View v, int arg2,
                    long arg3) {

                String url = "";
                url = (String) v.getTag();

                int nI = c.getColumnIndexOrThrow("intent");
                String nIntent = c.getString(nI);

                int tvTitle = c.getColumnIndexOrThrow("title");
                String title = c.getString(tvTitle);

                int tvLabel = c.getColumnIndexOrThrow("label");
                String label = c.getString(tvLabel);

                String queryKey = "SELECT * FROM " + label + " ORDER BY `_id` ASC";

                //Intent i = new Intent(nIntent);<- This doesn't?? work
                Intent i = new Intent(this, QueryDisplay.class);<- This works
                i.putExtra("QUERY_KEY", queryKey);
                i.putExtra("url", url);
                i.putExtra("TITLE", title);
                i.putExtra("LABEL", label);
                QueryDisplay.this.startActivity(i);
            }
        });

UPDATE: Here is the correct code:

lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View v, int arg2,
                    long arg3) {

                String url = "";
                url = (String) v.getTag();

                int nI = c.getColumnIndexOrThrow("intent");
                String intent = c.getString(nI);
                Class<?> nIntent = null;
                try {
                    nIntent = Class.forName(intent);
                } catch (ClassNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                int tvTitle = c.getColumnIndexOrThrow("title");
                String title = c.getString(tvTitle);

                int tvLabel = c.getColumnIndexOrThrow("label");
                String label = c.getString(tvLabel);

                String queryKey = "SELECT * FROM " + label + " ORDER BY `_id` ASC";

                Intent i = new Intent(QueryDisplay.this, nIntent);
                i.putExtra("QUERY_KEY", queryKey);
                i.putExtra("url", url);
                i.putExtra("TITLE", title);
                i.putExtra("LABEL", label);
                QueryDisplay.this.startActivity(i);
            }
        });

Answer 1

The problem is that nIntent is a String, not a Class object. If you look at the Intent documentation, you’ll see that the only constructor that accepts a single String requires that the string represents an action, not a class.

If you want to convert a String to a Class, I think you can do so with the Class.forName method.