Question

我想永久更改ListView中TextView（列表项）的颜色？

我想要新闻，如果我打开所有项目都会突出显示当我点击一个项目时，颜色会变为某种暗淡的外观并且它会永久粘贴。

但是当我滚动ListView时，Color会更改为其他List Item 在下面的图像我刚刚点击“关于杜尔加”我再次回到这个屏幕，我滚动ListView然后其他项目也在影响。即使我没有点击。

请发送任何代码。 [！[在此处输入图像说明] [1]] [1]

    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {


        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {
            // TODO Auto-generated method stub

            // Toast.makeText(getApplicationContext(),view.getSelectedItem().toString(), Toast.LENGTH_SHORT).show();
            defaultSet.add("no data");

            setOfClickedItems.add(id + "");

         //  parent.setBackgroundColor(Color.LTGRAY);


            final SharedPreferences prefs = getSharedPreferences("disablePref", MODE_PRIVATE);
            final SharedPreferences.Editor editor = prefs.edit();
            Set<String> disableList = prefs.getStringSet("disable_option", defaultSet);
            Iterator<String> iterator = disableList.iterator();
            while (iterator.hasNext()) {
                setOfClickedItems.add(iterator.next());
            }

            editor.putStringSet("disable_option", setOfClickedItems);
            editor.commit();

            Log.e("putshared",setOfClickedItems.size()+ "set size" + setOfClickedItems);


            Intent newsIntent = new Intent(MainActivity.this, NewsDescriptionActivity.class);
            newsIntent.putExtra("title", ((TextView) view.findViewById(R.id.news_heading)).getText().toString());

            newsIntent.putExtra("image_url", newsItems.get(position).getImgUrl());

            newsIntent.putExtra("summary", newsItems.get(position).getSummary());
            newsIntent.putExtra("desc", newsItems.get(position).getDescription());

            startActivity(newsIntent);

        }
    });

我的适配器

public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder = null;
    defaultSet.add("default");

    if (android.os.Build.VERSION.SDK_INT > 9) {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
                .permitAll().build();
        StrictMode.setThreadPolicy(policy);
    }


    font = Typeface.createFromAsset(context.getAssets(), "fonts/fontawesome-webfont.ttf");
    LayoutInflater mInflater = (LayoutInflater)
            context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.item_news_reader, null);
        holder = new ViewHolder();

        holder.txtTitle = (TextView) convertView.findViewById(R.id.news_heading);
        holder.imageView = (ImageView) convertView.findViewById(R.id.news_image);
        holder.buttonView = (TextView) convertView.findViewById(R.id.forward_button);

        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }


    News rowItem = (News) getItem(position);


    String img_url = rowItem.getImgUrl();
    URL newurl = null;
    Bitmap mIcon_val = null;
    try {
        newurl = new URL("http://10.2.195.165:9000" + img_url);

        Log.e("NEW URL", "++++++++++" + newurl);
        mIcon_val = BitmapFactory.decodeStream(newurl.openConnection().getInputStream());
        Log.e("BitMap", "++++++++++" + mIcon_val);


    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    final SharedPreferences prefs = context.getSharedPreferences("disablePref",Context.MODE_PRIVATE);
    Set<String> disableList = prefs.getStringSet("disable_option",defaultSet);
    Log.e("setsize",disableList+"items"+disableList.size());
    Iterator<String> iterator = disableList.iterator();
    while (iterator.hasNext()) {
        String iteratorValue = iterator.next();
        Log.e("inside iterator",""+iteratorValue+"view position"+position);
        if((position+"").equalsIgnoreCase(iteratorValue)) {
          Log.e("inside if",""+iteratorValue+"matched position"+position);
           // convertView.setBackgroundColor(Color.LTGRAY);
            holder.txtTitle.setTextColor(Color.GRAY);

        }

    }

    holder.txtTitle.setText(rowItem.getTitle());
    holder.imageView.setImageBitmap(mIcon_val);

    holder.buttonView.setTypeface(font);


    return convertView;
}

Answer 1

滚动时，

getView（）会回收您的视图。您在getView中将项目的文本颜色更改为灰色，并且该视图将被回收。因此，即使您未点击的项目文本也会变为灰色。

在你的getView（）中，你只定义了单击文本时应该具有的颜色。但是，如果未单击“视图”，则忘记定义颜色应该是什么。

将while循环中的代码更改为this（同时添加boolean wasClicked）：

  boolean wasClicked = false; //false by default

  while (iterator.hasNext()) {
        String iteratorValue = iterator.next();
        Log.e("inside iterator",""+iteratorValue+"view position"+position);
        if((position+"").equalsIgnoreCase(iteratorValue)) {
           wasClicked = true; //item was clicked
        }
   }

   //now let's change the text color based on if the item was clicked or not
   if(wasClicked){ //set color appropriate for clicked items
      holder.txtTitle.setTextColor(Color.GRAY);
   }else{ //item wasn't clicked
      holder.txtTitle.setTextColor(Color.BLACK); //or whatever color you want
   }

Answer 2

你基本上需要在你的适配器中存储每个列表项的状态（即点击它），然后在适配器getView(position ...)中你必须调整视图的背景颜色。

您的随机行为源于重用视图（它们维持不同getView(position ...)之间的状态。）

Answer 3

您必须按照此步骤执行此操作

1： - 转到item_news_reader.xml文件 2： - 您在同一个xml文件中给出文本字段和图像的文件，您可以通过此行设置文本颜色

 android:textColor="#000000"

或以编程方式试用

 extView.setTextColor(Color.parseColor("#bdbdbd"));

如何在listView中永久更改List Item（textView）的颜色？

3 个答案: