AutoCompleteTextView the suggestions will be limited. but since the method used in base class is private can't override it in child.

AutoCompleteTextView limit result

private void buildImeCompletions() {
        final int limit_result=20;
        //change the limit_result value
        
        final ListAdapter adapter = mAdapter;
        if (adapter != null) {
            InputMethodManager imm = InputMethodManager.peekInstance();
            if (imm != null) {
                final int count = Math.min(adapter.getCount(), limit_result);
                CompletionInfo[] completions = new CompletionInfo[count];
                int realCount = 0;

                for (int i = 0; i < count; i++) {
                    if (adapter.isEnabled(i)) {
                        Object item = adapter.getItem(i);
                        long id = adapter.getItemId(i);
                        completions[realCount] = new CompletionInfo(id, realCount,
                                convertSelectionToString(item));
                        realCount++;
                    }
                }
                
                if (realCount != count) {
                    CompletionInfo[] tmp = new CompletionInfo[realCount];
                    System.arraycopy(completions, 0, tmp, 0, realCount);
                    completions = tmp;
                }

                imm.displayCompletions(this, completions);
            }
        }
    }