我有一个片段，其中我将适配器设置为：
ChannelListAdapter adapter = new ChannelListAdapter(getActivity(),
R.layout.channellistrow_livetv, channelList, flag_for_layout);
adapter.notifyDataSetChanged();
gv.setAdapter(adapter);
和ChannelListAdapter：
public class ChannelListAdapter extends ArrayAdapter<Channel> {
private Context context;
private ArrayList<Channel> channelList;
private int rowLayoutResourceId;
private boolean flag_for_layout;
public static ViewHolder holder;
public ChannelListAdapter(Context context, int rowLayoutResourceId,
ArrayList<Channel> channelList ,boolean flag_for_layout ) {
super(context, rowLayoutResourceId, channelList);
this.flag_for_layout = flag_for_layout;
this.context = context;
this.channelList = channelList;
this.rowLayoutResourceId = rowLayoutResourceId;
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if( convertView == null ) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService( Context.LAYOUT_INFLATER_SERVICE );
convertView = inflater.inflate( rowLayoutResourceId, null);
holder = new ViewHolder();
holder.channelNameTextView = (TextView) convertView.findViewById( R.id.channel_name );
holder.channelLogoImageView = (ImageView) convertView.findViewById( R.id.channel_logo );
holder.tagImageChannel = (ImageView) convertView.findViewById(R.id.tagChannels);
if(flag_for_layout){
LinearLayout ll = (LinearLayout) convertView.findViewById(R.id.highlight);
ll.setPadding(8, 0, 0, 0);
DisplayMetrics displaymetrics = new DisplayMetrics();
((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int height = displaymetrics.heightPixels;
int width = displaymetrics.widthPixels;
holder.channelNameTextView.setLayoutParams(
new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
holder.channelNameTextView.setGravity(Gravity.CENTER);
holder.channelLogoImageView.setLayoutParams(new FrameLayout.LayoutParams(width/5, height/8));
ll.setGravity(Gravity.CENTER);
}
convertView.setTag( holder );
}else {
holder = (ViewHolder) convertView.getTag();
}
Channel currentChannel = channelList.get( position );
holder.channelNameTextView.setText( currentChannel.getChannelName() );
if(holder.channelLogoImageView!=null){
try {
UrlImageViewHelper.setUrlDrawable(holder.channelLogoImageView, currentChannel.getChannelLogoLink(), R.drawable.placeholder_logo);
}catch( Exception e ) {
e.printStackTrace();
holder.channelLogoImageView.setImageDrawable( context.getResources().getDrawable( R.drawable.placeholder_logo ) );
}
}
try {
if (currentChannel.getChannelPurchaseStatus() == Channel.PURCHASE_BOUGHT) {
//holder.tagImageChannel.setBackground(context.getResources().getDrawable(R.drawable.tag_upgrade));
holder.tagImageChannel.setBackgroundResource(0);
} else if (currentChannel.getChannelPurchaseStatus() == Channel.PURCHASE_BUY) {
holder.tagImageChannel.setBackground(context.getResources().getDrawable(R.drawable.tag_buy));
} else if (currentChannel.getChannelPurchaseStatus() == Channel.PURCHASE_DEFAULT) {
holder.tagImageChannel.setBackgroundResource(0);
}
} catch (Exception e) {
e.printStackTrace();
}
return convertView;
}
static class ViewHolder {
TextView channelNameTextView;
public ImageView channelLogoImageView ,tagImageChannel;
}
}
主要问题在于在click事件中是否有一个条件，其中用户被定向到asyn任务。在asyn任务的成功中，我必须将tagImageChannel更改为holder.tagImageChannel.setBackgroundResource（0）; 一旦成功条件得到满足，我怎么能从Asyn任务中做到这一点。
这是一个单独的课程。这是我的Asyn任务：
public class BuyCheck extends AsyncTask<String, Void, String> {
private static final String TAG = "com.newitventure.nettv.reusables.BuyCheck";
Channel channel;
CustomDialogManager progress;
Context context;
int durationToBuy;
SharedPreferences pref;
String code , channelCategory;
public BuyCheck(Context context, Channel channel, String durationToBuy, String channelCategory) {
this.channel = channel;
this.context = context;
this.durationToBuy = Integer.parseInt(durationToBuy);
this.channelCategory = channelCategory;
}
@Override
protected void onPreExecute() {
progress = new CustomDialogManager(context,
CustomDialogManager.LOADING);
progress.build();
progress.setMessage("Please wait...");
progress.show();
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
DownloadUtil getUtc = new DownloadUtil(LinkConfig.GET_UTC, context);
String utc = getUtc.downloadStringContent();
pref = context.getSharedPreferences(Util.APP_SHARED_PREFERENCES, Context.MODE_PRIVATE);
String email = pref.getString(Util.USER_EMAIL,"");
if (!utc.equals(DownloadUtil.NotOnline)
&& !utc.equals(DownloadUtil.ServerUnrechable)) {
DownloadUtil dUtil = new DownloadUtil(params[0] + "&userEmail="
+ email+ "&"
+ LinkConfig.getHashCode(context, utc), context);
Logger.d("BUY URL WITH PARAMETERS",
params[0] + "&userEmail="
+ email+"&"
+ LinkConfig.getHashCode(context,utc));
return dUtil.downloadStringContent();
} else
return utc;
/************ the following is another process to hit the url *******************/
/*
* List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
* nameValuePairs.add(new BasicNameValuePair("type", "singleMovie"));
* nameValuePairs.add(new BasicNameValuePair("duration", "1"));
* nameValuePairs.add(new BasicNameValuePair("product_id", "1"));
* Logger.d("name value pairs", nameValuePairs + ""); return
* dUtil.postDataAndGetStringResponse(nameValuePairs);
*/
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (progress.isShowing())
progress.dismiss();
Logger.d("the result in BUYCHECK--> ", result);
if (DownloadUtil.checkdownloadStringContent(context, result)) {
try {
JSONObject jobj = new JSONObject(result);
String message = "" ;
try {
String userBalance = pref.getString(Util.USER_BALANCE, "");
Double balance = Double.parseDouble(userBalance);
String successCode = jobj.getString("success_code");
code =successCode;
message = jobj.getString("success_message");
channel.setChannelPurchaseStatus(Channel.PURCHASE_BOUGHT);
balance-= channel.getchannelPrice()
* durationToBuy;
MultipleUsedMethods.updateUserBalance(context,balance+"");
} catch (JSONException je) {
je.printStackTrace();
try {
message = jobj.getString("error_message");
} catch (JSONException je2) {
je2.printStackTrace();
CustomDialogManager.ReUsedCustomDialogs.dataNotFetched(context);
}
}
final CustomDialogManager bought_dialog = new CustomDialogManager(
context, channel.getChannelName(), message,
CustomDialogManager.MESSAGE);
bought_dialog.build();
bought_dialog.show();
bought_dialog.setNegativeButton("OK",
new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
bought_dialog.dismiss();
if(code.equalsIgnoreCase("200")){
LinkConfig.loadChannelLink(context, channel, channelCategory);
}
// ((MainActivity)context).getFragment(1);
}
});
} catch (JSONException e) {
e.printStackTrace();
final CustomDialogManager bought_dialog = new CustomDialogManager(
context, channel.getChannelName(), result,
CustomDialogManager.MESSAGE);
bought_dialog.build();
bought_dialog.show();
bought_dialog.setNegativeButton("OK",
new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
bought_dialog.dismiss();
}
});
}
}
}
}
我想更改tagImageChannel，因为符合200的情况。我怎样才能做到这一点。