我已经实施了recyclerview，其下方有一个图片和图片按钮。当我点击图像按钮时我已经设置了一个祝酒词，当我点击它时，我想要更改图像按钮的颜色在视图离开可见区域之后所有项目的颜色变化，即如果我点击在第二个图像按钮，然后所有可见的第二个图像按钮变为彩色
我该如何解决这个问题？
这是我的代码：
package com.example.tatson.bila;
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
private String imageUrl;
private ImageLoader imageLoader;
private Context context;
String Load;
static int count = 0;
public static final String uu = "uu";
String number;
String user1;
public static final String UserNum = "UserNum";
SharedPreferences sharedPref;
private String[] pos;
private int visibleThreshold = 5;
private int lastVisibleItem, totalItemCount;
private boolean loading;
private OnLoadMoreListener onLoadMoreListener;
// JSON parser class
JSONParser jsonParser = new JSONParser();
String url,imgoffset;
//testing from a real server:
private static final String LIKE_URL = "my php";
//ids
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
List<SuperHeroes> superHeroes1;
//List of superHeroes
List<SuperHeroes> superHeroes;
private RecyclerView recyclerView;
public CardAdapter() {
}
public CardAdapter(List<SuperHeroes> superHeroes, Context context) {
super();
//Getting all the superheroes
this.superHeroes = superHeroes;
superHeroes1= superHeroes;
this.context = context;
sharedPref =context.getSharedPreferences(UserNum, 0);
number = sharedPref.getString(uu, "");
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.superheroes_list, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
SuperHeroes superHero = superHeroes.get(position);
Log.d("position", String.valueOf(position));
Log.d("url", superHero.getImageUrl());
imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
imageLoader.get(superHero.getImageUrl(), ImageLoader.getImageListener(holder.imageView, R.mipmap.ic_launcher, android.R.drawable.ic_dialog_alert));
holder.imageView.setImageUrl(superHero.getImageUrl(), imageLoader);
holder.textViewName.setText(superHero.getName());
holder.textViewRank.setText(String.valueOf(superHero.getRank()));
// holder.textViewPowers.setText(powers);
holder.like.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
ImageButton like =(ImageButton) v.findViewById(R.id.button_like);
like.setImageResource(R.drawable.plike);
SuperHeroes s = superHeroes.get(position);
Load = s.getImageUrl();
Log.d("test", Load);
new LikeIt().execute();
}
});
}
@Override
public int getItemCount() {
return superHeroes.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public NetworkImageView imageView;
public TextView textViewName;
public TextView textViewRank;
public TextView textViewRealName;
public TextView textViewCreatedBy;
public TextView textViewFirstAppearance;
public TextView textViewPowers;
public ImageButton like;
public ViewHolder(View itemView) {
super(itemView);
imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero);
textViewName = (TextView) itemView.findViewById(R.id.textViewName);
textViewRank = (TextView) itemView.findViewById(R.id.textViewRank);
// textViewRealName= (TextView) itemView.findViewById(R.id.textViewRealName);
// textViewCreatedBy= (TextView) itemView.findViewById(R.id.textViewCreatedBy);
// textViewFirstAppearance= (TextView) itemView.findViewById(R.id.textViewFirstAppearance);
// textViewPowers= (TextView) itemView.findViewById(R.id.textViewPowers);
like = (ImageButton) itemView.findViewById(R.id.button_like);
}
}
class LikeIt extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
*/
boolean failure = false;
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
// Check for success tag
int success;
String Imgurl = Load;
Log.d("request!", number);
// try {
// Building Parameters
HashMap<String, String> Params = new HashMap<String, String>();
Params.put("Imgurl", Imgurl);
Params.put("user", number);
Log.d("request!", "starting");
String encodedStr = getEncodedData(Params);
//Will be used if we want to read some data from server
BufferedReader reader = null;
//Connection Handling
try {
//Converting address String to URL
URL url = new URL(LIKE_URL);
//Opening the connection (Not setting or using CONNECTION_TIMEOUT)
HttpURLConnection con = (HttpURLConnection) url.openConnection();
//Post Method
con.setRequestMethod("POST");
//To enable inputting values using POST method
//(Basically, after this we can write the dataToSend to the body of POST method)
con.setDoOutput(true);
OutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream());
//Writing dataToSend to outputstreamwriter
writer.write(encodedStr);
//Sending the data to the server - This much is enough to send data to server
//But to read the response of the server, you will have to implement the procedure below
writer.flush();
//Data Read Procedure - Basically reading the data comming line by line
StringBuilder sb = new StringBuilder();
reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line;
while((line = reader.readLine()) != null) { //Read till there is something available
sb.append(line + "\n"); //Reading and saving line by line - not all at once
}
line = sb.toString(); //Saving complete data received in string, you can do it differently
//Just check to the values received in Logcat
Log.i("custom_check","The values :");
Log.i("custom_check", line);
} catch (Exception e) {
e.printStackTrace();
} finally {
if(reader != null) {
try {
reader.close(); //Closing the
} catch (IOException e) {
e.printStackTrace();
}
}
}
//Same return null, but if you want to return the read string (stored in line)
//then change the parameters of AsyncTask and return that type, by converting
//the string - to say JSON or user in your case
return null;
}
}
private String getEncodedData(Map<String,String> data) {
StringBuilder sb = new StringBuilder();
for(String key : data.keySet()) {
String value = null;
try {
value = URLEncoder.encode(data.get(key), "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
if(sb.length()>0)
sb.append("&");
sb.append(key + "=" + value);
}
return sb.toString();
}
/**
* After completing background task Dismiss the progress dialog
**/
protected void onPostExecute() {
// dismiss the dialog once product deleted
}
}
答案 0 :(得分：0)
而不是在 onBindViewHolder 中定义点击监听器，而只是在我的类 ViewHolder 中，就像我在下面发布的那样，它将避免调用RecyclerView中的项目点击和整个一次排，同样也可以用你的方法完成，但这很昂贵，阅读THIS为什么在 onBindViewHolder 中定义点击事件不是一个好习惯。
现在回答部分如何在点击时更改imageButton的颜色并显示祝酒词。
RecyclerAdapter类：
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ItemsViewHolder>{
private static List<MapperClass> wordsList;
// some other variables to use
public RecyclerAdapter(Context con, List<MapperClass> wordsList){
RecyclerAdapter.wordsList=wordsList;
RecyclerAdapter.context=con;
}
public static class ItemsViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView txtViewWord,txtViewPOS;
ImageButton imgButtonFavourite;
boolean starred = false; //for checking that row is starred(favourite-d) or not
// & to avoid resetting of imageButton on scroll of recyclerView.
public ItemsViewHolder(View itemView){ //here you should define click events.
super(itemView);
txtViewWord = (TextView) itemView.findViewById(R.id.txtView_Word);
txtViewPOS = (TextView) itemView.findViewById(R.id.txtView_PartOfSpeech);
imgButtonFavourite = (ImageButton) itemView.findViewById(R.id.imgButton_Favourite);
itemView.setOnClickListener(this);
imgButtonFavourite.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(starred){
Drawable starEmpty = view.getResources().getDrawable(R.drawable.ic_favourite);
starEmpty.setBounds(0,0,24,24);
imgButtonFavourite.setBackground(starEmpty);
}else{ //here i am setting another pic when user marks word favourite i.e.
// filled star , you can change color of imageButton here instead of
// changing icon, u can simply getColor from getResource
// and pass it desired color
Drawable startFilled = view.getResources().getDrawable(R.drawable.ic_favourite_filled);
startFilled.setBounds(0,0,24,24);
imgButtonFavourite.setBackground(startFilled);
//here instead of normal toast, i used Snackbar :D (Toast on Steroids) **requires design support library**
//when you will click imageButton a snackBar will pop out
Snackbar.make(view, "Icon changed of imageButton", Snackbar.LENGTH_LONG).show();
// here you have toast as well, use any one
//Toast.makeText(view, "Icon changed of imageButton", Toast.LENGTH_LONG).show();
}
starred = !starred;
}
});
}
通过这种方式，您可以在点击图片或更改图片或更改颜色时点击它并显示信息。
这可能对某些人有帮助。