在recyclerview中滚动滚动背景颜色或图像？

我想知道当我向下或向上滚动时，我的图像和布局颜色都在洗牌，我使用recyclerview创建了cardview。 并设置一个图像（在点击时更改颜色，以便知道其用户最喜欢的项目）和setbackgroundcolor（随机chossen）到父布局，以使cardview吸引人。 但是当我滚动1.图像改变位置的图像，2。布局背景自动改变颜色。

我在这里发布我的适配器代码。

public class TOAdapter extends RecyclerView.Adapter { JSONArray jsonArray; private String title; private String image; private ImageLoader imageLoader; private String subtitle; private String subti; private Context context; private ImageView clip; public TOAdapter(JSONArray jsonArray) { this.jsonArray = jsonArray; } // Create new views (invoked by the layout manager) @Override public TOAdapter.ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) { // create a new view View itemLayoutView = LayoutInflater.from(parent.getContext()) .inflate(R.layout.top_twenty_list, parent, false); final ViewHolder viewHolder = new ViewHolder(itemLayoutView); final Random random = new Random(System.currentTimeMillis());// We add 155 since we want at least 155 in each channel.// Then we add to it a random number between 0 and 100. int r = 155 + random.nextInt(101); int g = 155 + random.nextInt(101); int b = 155 + random.nextInt(101); int color = Color.rgb(r, g, b); viewHolder.frame.setBackgroundColor(color); viewHolder.layer.setBackgroundColor(color); clip = (ImageView) itemLayoutView.findViewById(R.id.ic_clip); clip.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { int iColor = Color.parseColor("#0000FF"); int red = (iColor & 0xFF0000) / 0xFFFF; int green = (iColor & 0xFF00) / 0xFF; int blue = iColor & 0xFF; float[] matrix = {0, 0, 0, 0, red , 0, 0, 0, 0, green , 0, 0, 0, 0, blue , 0, 0, 0, 1, 0}; ColorFilter colorFilter = new ColorMatrixColorFilter(matrix); clip.setColorFilter(colorFilter); } }); return viewHolder; } // Replace the contents of a view (invoked by the layout manager) @Override public void onBindViewHolder(final ViewHolder viewHolder, int position) { // - get data from your itemsData at this position // - replace the contents of the view with that itemsData // myTypeface = Typeface.createFromAsset(context.getAssets(), "fonts/RobotoCondensedBoldItalic.ttf"); try { JSONObject obj = jsonArray.getJSONObject(position); title = obj.getString("title"); image = obj.getString("brand_logo"); subtitle = obj.getString("sub_title"); } catch (JSONException e) { e.printStackTrace(); } viewHolder.txtViewTitle.setText(subtitle); viewHolder.subtitle.setText(title); if (imageLoader == null) imageLoader = AppController.getInstance().getImageLoader(); String full_Url = "http://mycompany/assets/new" + image; viewHolder.thumbnail.setImageUrl(full_Url, imageLoader); viewHolder.btn_get_deal.setTag(position); viewHolder.btn_get_deal.setOnClickListener(new View.OnClickListener() { public JSONObject obj; public ArrayList offerlist = new ArrayList(); @Override public void onClick(View view) { Intent offerpage = new Intent(AppController.getInstance().getApplicationContext(), OfferDetails.class); Integer pos = (Integer) view.getTag(); try { obj = jsonArray.getJSONObject(pos); offerpage.putExtra("jsonObj", obj.toString()); } catch (JSONException e) { e.printStackTrace(); } //offerpage.getParcelableArrayListExtra(offerlist); offerpage.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); AppController.getInstance().getApplicationContext().startActivity(offerpage); } }); //viewHolder.txtViewTitle.setTypeface(myTypeface); } // inner class to hold a reference to each item of RecyclerView public static class ViewHolder extends RecyclerView.ViewHolder { private final NetworkImageView thumbnail; private final RelativeLayout frame; private final RelativeLayout layer; public TextView txtViewTitle; public TextView subtitle; public ImageView clip; public CardView btn_get_deal; public ViewHolder(View itemLayoutView) { super(itemLayoutView); txtViewTitle = (TextView) itemLayoutView.findViewById(R.id.txttitle_toptwenty); subtitle = (TextView) itemLayoutView.findViewById(R.id.sub_title_toptwenty); thumbnail = (NetworkImageView) itemLayoutView.findViewById(R.id.thumbnail_topwenty); frame = (RelativeLayout) itemLayoutView.findViewById(R.id.frame); layer = (RelativeLayout) itemLayoutView.findViewById(R.id.layer); btn_get_deal = (CardView) itemLayoutView.findViewById(R.id.card_view); } } // Return the size of your itemsData (invoked by the layout manager) @Override public int getItemCount() { return jsonArray.length(); } 

}

Answer 1

我已经创建了一个你想要完成的工作示例。 您遇到的错误来源主要是您不了解视图回收。 我现在不打算向你解释整个事情，但无论如何这里是一个例子：

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对于示例，我为每一行使用了此布局：

我用过这个型号：

 public class ExampleModel { private final int mColor; private final String mText; public ExampleModel(int color, String text) { mColor = color; mText = text; } public int getColor() { return mColor; } public String getText() { return mText; } } 

而这个观点持有人：

 public class ExampleViewHolder extends RecyclerView.ViewHolder { private final FrameLayout mBackground; private final TextView mTextView; public ExampleViewHolder(View itemView) { super(itemView); mBackground = (FrameLayout) itemView.findViewById(R.id.background); mTextView = (TextView) itemView.findViewById(R.id.textView); } public void bind(ExampleModel model) { mBackground.setBackgroundColor(model.getColor()); mTextView.setText(model.getText()); } } 

正如您所看到的一样， Adapter实现同样简单：

 public class ExampleAdapter extends RecyclerView.Adapter { private final LayoutInflater mInflater; private final List mModels; public ExampleAdapter(Context context, List models) { mInflater = LayoutInflater.from(context); mModels = models; } @Override public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { final View itemView = mInflater.inflate(R.layout.item_example, parent, false); return new ExampleViewHolder(itemView); } @Override public void onBindViewHolder(ExampleViewHolder holder, int position) { final ExampleModel model = mModels.get(position); holder.bind(model); } @Override public int getItemCount() { return mModels.size(); } } 

而你使用这样的整个事情：

 final Random mRandom = new Random(System.currentTimeMillis()); @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); final List models = new ArrayList<>(); for (int i = 0; i < 100; i++) { final int randomColor = generateRandomPastelColor(); models.add(new ExampleModel(randomColor, String.valueOf(i))); } final ExampleAdapter adapter = new ExampleAdapter(getActivity(), models); recyclerView.setAdapter(adapter); } public int generateRandomPastelColor() { final int baseColor = Color.WHITE; final int red = (Color.red(baseColor) + mRandom.nextInt(256)) / 2; final int green = (Color.green(baseColor) + mRandom.nextInt(256)) / 2; final int blue = (Color.blue(baseColor) + mRandom.nextInt(256)) / 2; return Color.rgb(red, green, blue); } 

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这应该是你想要的，你可以用它作为如何实现你的Adapter一个例子。

Answer 2

我遇到了同样的问题，当我在listView行中使用radioButton时，我解决了它。 在每次滚动清除缓存时，您必须将更改的数据存储在每一行中。 只需检查我的代码

 @Override public View getView(final int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub // if(position==0) // Toast.makeText(context, ""+QuestionViewPageAdapter.mRadioGroupData, Toast.LENGTH_SHORT).show(); final ViewHolder viewHolder; View row=convertView; radioButton=new RadioButton[Integer.parseInt(mNoOfCategoryGreading)]; LayoutInflater inflater =LayoutInflater.from(context);//(LayoutInflater)context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); row = inflater.inflate(R.layout.question_row, parent, false); viewHolder=new ViewHolder(); viewHolder.tv_qContent=(TextView)row.findViewById(R.id.tv_question); viewHolder.rg=(RadioGroup)row.findViewById(R.id.rgrp); for(int i=0;i map=new HashMap(); map.put("position", ""+(idx+1)); map.put("Id", ""+data.get(position).get(AppData.question_Set_category_QuestionID)); map.put("CategoryId", ""+mCategoryId); QuestionViewPageAdapter.mRadioGroupData.add(map); } }); return row; } private void isAvailabel(String qId){ for(int i=0;i 

Answer 3

在我的情况下，重写getItemId并将sethasStableIds设置为true解决了混乱问题。

在适配器中：

  @Override public long getItemId(int position) { Object listItem = feeds.get(position); return listItem.hashCode(); } 

在主要活动/片段中：

  adapter = new FeedAdapter(feeds, getContext()); adapter.setHasStableIds(true);