问题
I am using a ListView with a custom Adapter. I have two TextView inside each row. I need to change the text of these TextView only for the textViews which I click. How can I achieve it?
I have a method inside my CustomAdapter where I initialise the TextView's
public class MainListAdapter extends BaseAdapter {
private static final String TAG = "MainListAdapter";
private Context mContext;
private LayoutInflater layoutInflater;
private MyViewPager itemViewPager;
private View viewMain;
private View viewSlide;
private TextView cancel;
private TextView delete, block;
TextView itemName, showResult;
int triedOnce;
private ArrayList<View> views;
private PagerAdapter pagerAdapter;
private ArrayList<String> mList;
public static final String API_KEY = "MYAPIKEY";
public MainListAdapter(Context context, ArrayList<String> list) {
mContext = context;
layoutInflater = LayoutInflater.from(mContext);
mList = list;
}
@Override
public int getCount() {
return mList != null ? mList.size() : 0;
}
@Override
public Object getItem(int position) {
return mList != null ? mList.get(position) : null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.listview_item, null);
}
if(position%2 == 0){
convertView.setBackgroundResource(R.drawable.lis_bg);
}else if(position%2 == 1){
convertView.setBackgroundResource(R.drawable.ls_eppadi_bg);
}
viewMain = layoutInflater.inflate(R.layout.listview_item_main, null);
viewSlide = layoutInflater.inflate(R.layout.listview_item_slide, null);
cancel = (TextView)viewSlide.findViewById(R.id.tv_menu_cancel);
delete = (TextView)viewSlide.findViewById(R.id.tv_menu_delete);
block = (TextView) viewSlide.findViewById(R.id.tv_menu_block);
cancel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//perform cancel
}
});
delete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//perform delete
}
});
block.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//perform block
}
});
views = new ArrayList<View>();
views.add(viewMain);
views.add(viewSlide);
itemViewPager = (MyViewPager)convertView.findViewById(R.id.vp_list_item);
itemViewPager.setSelfIndex(position);
pagerAdapter = new PagerAdapter() {
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
((MyViewPager)container).removeView(views.get(position));
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
((MyViewPager)container).addView(views.get(position));
return views.get(position);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public int getCount() {
return views.size();
}
};
fillItemData(convertView, position, viewMain);
itemViewPager.setAdapter(pagerAdapter);
itemViewPager.setCurrentItem(0);
return convertView;
}
//this is where the textview's are initialised
private void fillItemData(View convertView, final int position, View viewMain) {
int[] colorCollection = {
R.color.green, R.color.royalblue, R.color.violet
};
for (int i = 0; i < colorCollection.length; i++) {
colorCollection[i] = mContext.getResources().getColor(colorCollection[i]);
}
int currColor = colorCollection[position % colorCollection.length];
itemName = (TextView)viewMain.findViewById(R.id.tv_item_name);
showResult = (TextView)viewMain.findViewById(R.id.tv_show);
itemName.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
new PushTask().execute(position);
triedOnce = 0;
}
});
itemName.setBackgroundColor(currColor);
showResult.setBackgroundColor(currColor);
itemName.setText(mList.get(position));
}
class PushTask extends AsyncTask<Integer, Integer, Integer> {
@Override
protected void onPreExecute() {
itemName.setVisibility(View.GONE);
showResult.setVisibility(View.VISIBLE);
//set text here based on the position
showResult.setText("SENDING");
}
@Override
protected Integer doInBackground(Integer... position) {
int post = position[0];
int respCode = 0;
//perform my network operations
return respCode;
}
@Override
protected void onPostExecute(Integer response) {
switch(response) {
case 1:
//set text here
showResult.setText("SENT");
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
showResult.setVisibility(View.GONE);
itemName.setVisibility(View.VISIBLE);
}
}, 2000);
break;
case 2:
//set text here
showResult.setText("PLEASE WAIT!");
handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
showResult.setVisibility(View.GONE);
itemName.setVisibility(View.VISIBLE);
}
}, 2000);
break;
case 3:
//set text here
showResult.setText("FAILED!");
handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
showResult.setVisibility(View.GONE);
itemName.setVisibility(View.VISIBLE);
}
}, 2000);
break;
case 4:
//set text here
showResult.setText("FAILED!");
handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
showResult.setVisibility(View.GONE);
itemName.setVisibility(View.VISIBLE);
}
}, 2000);
break;
default:
break;
}
}
}
}
Now I need to change the itemName and showResult's text based on the position where the user clicks. The itemName.setOnClickListener has the AsyncTask where I will changing the text of these textViews.
Currently it changes for the last row of the listView.
How do I change it for the position selected.
Thanks in advance.
回答1:
Override the getView(...) function of CustomAdapter,where one of the arguments is int position .
Don't forget to use convertView, holder and settag/gettag for smooth scrolling and correct references
Update:
in getView put:
convertView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//perform update on textView here
}
});
Also we need reference of convertView in postExecute(). You can pass this reference in AsycTask arguments or set getter setter for the adapter and get clicked reference in asyctask postexecute()
回答2:
create a model(POJO) class first with your two strings and one boolean value call it as isChecked add getters and setters to it
set values(list data) to your arraylist and keep setIsChecked value to false for the first time. like this
ArrayList<model> list = new ArrayList<model>();
list.add(new model("string1","string2",false);
list.add(new model("string11","string22",false);
and so on
now onItemClickListener use for loop like this
for(int i = 0 ; i < list.size; i++){
list.get(i).setIsChecked(false);
}
list.get(itemClickedPosition).setIsChecked(true);
youradapter.notifyDataSetChanged();
after that now come to the adapter class where you can set the selected textview as you want do like this
in getView method do this
if(list.get(position).getIsChecked()){
change your textview
}else{
leave as it is
}
done let me know if it helps you
回答3:
Pass View in Async Task and then convert into textView and SetText in DoInBackground Method.
new PushTask().execute(v);
@Override
protected Integer doInBackground(final View position) {
runOnUiThread(new Runnable() {
public void run() {
// some code #3 (Write your code here to run in UI thread)
TextView txtName=(TextView)position;
txtname.setText(“android”):
}
});
}
来源：https://stackoverflow.com/questions/31340985/set-text-to-textview-at-a-particular-position-inside-a-listview