ActivityInstrumentationTestCase2 GridView Select View

First, Test Target Activity...
Reference Basic GirdView Program to here.

Add OnClikcListener() include GridView. It is include position information. I create other
OnClickListener Class.

class OnClickListenerDetectPosition implements OnClickListener {
 private int mPosition = 0;
 public OnClickListenerDetectPosition(int position ) {
  mPosition = position;
 }
 @Override
 public void onClick(View v) {
  Log.d("GridViewActivity", "onClick = " + mPosition);
 }
 
}

register OnClickListner by it.

OnClickListener onclikclistener = new OnClickListenerDetectPosition(position);
imageView.setOnClickListener(onclikclistener);

Second, Tester. It is extends ActivityInstrumentationTestCase2. set position. must be UIThread

mActivity.runOnUiThread(new Runnable() {
 public void run() {
  Log.d("GridViewActivity", "setSelection 2");
  gridview.setSelection(2);
 }
});
mInstrumentation.waitForIdleSync();

get selected view and click view.

mActivity.runOnUiThread(new Runnable() {
 public void run() {
  
  Log.d("GridViewActivity", "getSelectedItemPosition = " + gridview.getSelectedItemPosition ());
  
  Log.d("GridViewActivity", "getSelectedView");
  ImageView imageview = (ImageView)gridview.getSelectedView();
  Log.d("GridViewActivity", "performClick");
  imageview.performClick();
 }
});

Check Logcat.

setSelection 2
getSelectedItemPosition = 2
onClick = 2

It is OK.
  Test target source code is here.
  Tester source code is here.