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copied!<p>That's because <em>findViewById</em> called on a view looks for the child view of the given view. </p> <p><a href="http://developer.android.com/reference/android/view/View.html#findViewById%28int%29" rel="nofollow">findViewById doc</a></p> <p>"Look for a child view with the given id. If this view has the given id, return this view."</p> <p>From what I can see, CBV_textview2 is contained in the layout of the activity. So, what you can do is to pass the activity to the adapter's constructor (I see you already have a _c member variable which I suppose is a Context, OR directly pass the CBV_textview2 itself (calling findViewById in the containing activty).</p> <p>In both cases, you need to call the activity's findViewById which "Finds a view that was identified by the id attribute from the XML that was processed in onCreate(Bundle)."</p> <pre><code>public class YourAdapter extends ArrayAdapter<String> { private final Context context; // blahblahblah private final TextView mYourTextView; public YourAdapter(Context context, String[] values, TextView btnUpdate) { super(context, R.layout.rowlayout, values); this.context = context; this.values = values; mYourTextView = btnUpdate; } .... @Override public void onClick(View v) { Toast.makeText(_c, "clicked quick add "+p, Toast.LENGTH_SHORT).show(); //mYourTextView.setTag(1); //mYourTextView.setText(btnUpdate.getTag().toString()); mYourTextView.setText("b"); } </code></pre> <p>In your activity you should be able to get the TextView before calling the constructor. </p>

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