安卓：fastScrollEnabled不工作第一 [英] Android: fastScrollEnabled not working at first

问题描述

OK，我的工作有一个列表视图，并在顶部的EditText框页面的应用程序。当你输入的东西进入的EditText框，将筛选哪些项目显示在列表视图。我遇到的问题是与滑块的一侧出现快速滚动的图标。
当第一次加载页面，无论我做什么的快速滚动滑块图标将不会出现在屏幕上。然后我点击编辑文本框，并输入一个字符，然后删除了它，现在我快速滚动滑块图标将出现。

第一次加载没有快速滚动图标。

EDITTEXT框，然后删除文字和快速滚动图标出现。

OK, I am working on an App that has a page with a listview and a edittext box at top. As you type things into the edittext box it will filter what items are shown in the listview. The problem I am having is with the fast scroll icon that appears on the side of the slider.
When the page first loads NO MATTER what I do the fast scroll slider icon will not appear on the screen. Then I click in the edit text box and type one character and then erase it and now my fast scroll slider icon will appear.

First load no fast scroll icon.

Edittext box and then erase text and fast scroll icon appears.

我的机器人：fastScrollEnabled =真在我的列表视图设置。另外，我已经做lv1.setFastScrollEnabled（真）在code手动设置;

I have the android:fastScrollEnabled="true" set in my listview. Plus I have set it manually in the code by doing lv1.setFastScrollEnabled(true);

无论我改变我仍然得到同样的行为，除非我删除它从code和XML完成，然后它会停止工作，在第二页上。我试图清理我的项目，仍然没有好。我倾向于它是Android中的错误或我失去了一些东西非常简单。

这是我的code。

No matter I change I still get the same behavior, unless I remove it complete from the code and xml and then it will stop working on the second page. I have tried cleaning my project and still no good. I am leaning towards it being a bug in android or I am missing something extremely simple.

Here is my code.

public class SearchByFood extends ParentClass
{
private ListView lv1;
private EditText ed;
int textlength = 0;
private ArrayList<String> arr_sort = new ArrayList<String>();
private ArrayList<String> foods = new ArrayList<String>();
private LayoutInflater mInflater;
private ArrayList<Food> foodList;

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.search_by_food);
    setTextTitle("Search by Food");

    lv1 = (ListView) findViewById(R.id.ListView01);
    ed = (EditText) findViewById(R.id.EditText01);
    mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    DataLayerFunctions d = new DataLayerFunctions(getApplicationContext());

    foodList = d.selectFoodsWithSubstitutes();
    for (Food f : foodList)
    {
        // this is to build a ArrayList<String> to pass to the setAdapter
        Log.d("SearchByFood", "FoodName: " + f.getFood_Name());
        foods.add(f.getFood_Name());
    }

    ArrayAdapter<String> firstAdapter = new ArrayAdapter<String>(SearchByFood.this, R.layout.search_food_listview, foods);
    lv1.setAdapter(firstAdapter);
    lv1.setFastScrollEnabled(true);

    ed.addTextChangedListener(new TextWatcher()
    {
        public void afterTextChanged(Editable s)
        {
        }

        public void beforeTextChanged(CharSequence s, int start, int count, int after)
        {
        }

        public void onTextChanged(CharSequence s, int start, int before, int count)
        {
            textlength = ed.getText().length();
            arr_sort.clear();
            for (String f : foods)
            {
                if (textlength <= f.length())
                {
                    if (f.toString().toLowerCase().contains((CharSequence) ed.getText().toString().toLowerCase()))
                    {
                        Log.d("STRING", "STRING: " + f.toString() + " contains " + ed.getText());

                        if (ed.getText().length() > 0)
                        {
                            String newString = boldMyString(f, ed.getText().toString());
                            arr_sort.add(newString);
                        }
                        else
                        {
                            arr_sort.add(f);
                        }

                    }
                }
            }

            // if empty add a no foods found
            if (arr_sort.isEmpty())
            {
                arr_sort.add("No Foods Found");
            }

            // Load array
            // lv1.setAdapter(new
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(SearchByFood.this, R.layout.search_food_listview, arr_sort)
            {
                @Override
                public View getView(int position, View convertView, ViewGroup parent)
                {
                    View row;

                    if (null == convertView)
                    {
                        row = mInflater.inflate(R.layout.search_food_listview, null);
                    }
                    else
                    {
                        row = convertView;
                    }

                    TextView tv = (TextView) row.findViewById(android.R.id.text1);
                    tv.setText(Html.fromHtml(getItem(position)));
                    // tv.setText(getItem(position));

                    return row;
                }

            };
            lv1.setAdapter(adapter);
        }

        private String boldMyString(String foodName, String guess)
        {
            int gLength = guess.length();
            ArrayList<Integer> results = new ArrayList<Integer>();

            for (int i = foodName.toLowerCase().indexOf(guess.toLowerCase()); i >= 0; i = foodName.toLowerCase()
                    .indexOf(guess.toLowerCase(), i + 1))
            {
                System.out.println("TEST:" + i);
                results.add(i);
            }

            // Count value is for words that have 2 or more values of guess
            // in them.
            int count = 0;
            for (int i : results)
            {
                StringBuffer s1 = new StringBuffer(foodName);
                s1.insert(i + count, "<b>");
                count = count + 3;

                s1.insert(i + count + gLength, "</b>");
                count = count + 4;

                foodName = s1.toString();
                System.out.println("FOOD NAME:" + i + ":" + foodName);

            }
            return foodName;
        }
    });

    // This is what actually does stuff when you click on a listview item.
    lv1.setOnItemClickListener(new OnItemClickListener()
    {
        public void onItemClick(AdapterView<?> parent, View view, int position, long id)
        {

            // Strip out the bold tags
            String clicked = (String) lv1.getItemAtPosition(position);
            clicked = clicked.replaceAll("<b>", "");
            System.out.println("Clicked" + clicked);
            clicked = clicked.replaceAll("</b>", "");

            // Find the Food ID match and pass the food id to the
            // fooddisplay page
            for (Food f : foodList)
            {
                if (null != clicked && clicked.equals(f.getFood_Name()))
                {
                    Intent intent = new Intent(SearchByFood.this, SubstituteDisplay.class);
                    intent.putExtra("FoodID", f.getFood_ID());
                    startActivity(intent);

                }
            }
        }

    });

}

@Override
public void onBackPressed()
{
    final Intent intent = new Intent(this, MasterTemplateActivity.class);

    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    this.startActivity(intent);
    return;
}
}

同样，任何帮助，为什么我的快速滚动图标没有出现在第一次将是非常美联社preciated。这是一个很小的事情，但它是真的讨厌我。

Again, any help as to why my fast scroll icon doesn't show up at first would be much appreciated. It is a small thing but it is really annoying me.

推荐答案

尝试 list.setFastScrollAlwaysVisible（真）

和也尽量 list.smoothScrollToPosition（0）使图标滚动时调用出现...

and also try list.smoothScrollToPosition(0); so that icon appears when scroll is called...

这样的事情。

new Handler().postDelayed(new Runnable() {
  @Override
  public void run(){
    list.smoothScrollToPosition(0);
  }
}, 100);

这篇关于安卓：fastScrollEnabled不工作第一的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！