我重用了在AsyncTask类中计算的Integer值，我需要经常创建这个类的新实例，因为在后台计算的函数需要为{{1}的每个元素完成}}。
我正在初始化一个新的BackgroundTask，所以我在名为ListView的主方法中使用此代码
ShowItems(final Item item)到此为止。然后我需要在 mBackgroundTask = new BackgroundTask(this);
mBackgroundTask.execute(item.getId(), (long)3);
中创建一个新的mBackgroundTask，这就是问题所在。我在定义新类时不能使用它，因为我将获取ToggleButton的实例，而不是原始的ToggleButton
这是我的完整代码
AsyncResponse和
public interface AsyncResponse {
Integer processFinish(Integer result);
}
更多代码
public class ItemView extends LinearLayout implements AsyncResponse{
public TextView prezzo;
public TextView scadenza;
public TextView followers;
public ImageView ic_thumbnail;
public ProgressBar hProgressBar;
public ToggleButton followButton;
public String nextFollowAction = "";
public Integer result1 = 77;
public BackgroundTask mBackgroundTask = null;
public ItemView(Context context, AttributeSet attrs) {
super(context, attrs);
//mBackgroundTask.delegate = this;
// TODO Auto-generated constructor stub
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
prezzo = (TextView)findViewById(R.id.tvPrezzo);
scadenza = (TextView)findViewById(R.id.tvScadenza);
followers = (TextView)findViewById(R.id.tvFollowers);
ic_thumbnail = (ImageView)findViewById(R.id.ic_thumbnail);
hProgressBar = (ProgressBar)findViewById(R.id.hProgressBar);
followButton = (ToggleButton)findViewById(R.id.btnFollow);
}
public void showItems(final Item item) {
prezzo.setText(item.getPrezzo());
ic_thumbnail.setImageBitmap(item.getIcon());
scadenza.setText(item.getPrezzo());
followers.setText("Followers: " + item.getFollowers());
hProgressBar.setProgress(item.getCoefficient());
mBackgroundTask = new BackgroundTask(this);
mBackgroundTask.execute(item.getId(), (long)3);
if (result1 != null){
Log.i("result1 = ", Integer.toString(result1));
askForFollowing(result1, nextFollowAction, item);
}
followButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
// The toggle is enabled
Log.i("followButton", "toggle enabled");
followButton.getTextOn();
//error
mBackgroundTask = new BackgroundTask(this);
mBackgroundTask.execute(item.getId(), (long)1);
//askForFollowing(statusCode, nextFollowAction, item);
//increaseFollowers(item);
followButton.setBackgroundResource(R.drawable.action_object_button_gray);
} else {
// The toggle is disabled
Log.i("followButton", "toggle disabled");
mBackgroundTask = new BackgroundTask(this);
mBackgroundTask.execute(item.getId(), (long)2);
followButton.getTextOff();
followButton.setBackgroundResource(R.drawable.action_object_button_green);
}
}
});
}
public void askForFollowing(int statusCode, String nextFollowAction, Item item){
//Status code: 0 --> OK
if(statusCode == 0) {
Log.i("changeFollowStatus(nextFollowAction);", "changeFollowStatus(nextFollowAction);");
changeFollowStatus(nextFollowAction, item);
}
// Status code 108 --> Oggetto già seguito
else if ((statusCode == 108) && (nextFollowAction.contains("kCheckFollowAction"))) {
Log.i("statusCode == 108", "statusCode == 108");
nextFollowAction = "kUnfollowAction";
followButton.setEnabled(true);
followButton.setBackgroundResource(R.drawable.action_object_button_gray);
followButton.setText("seguito");
}
// Status code 122 --> Oggetto non ancora seguito
else if ((statusCode == 122) && (nextFollowAction.contains("kCheckFollowAction"))) {
Log.i("statusCode == 122", "statusCode == 122");
nextFollowAction = "kFollowAction";
followButton.setEnabled(false);
followButton.setBackgroundResource(R.drawable.action_object_button_green);
followButton.setText("segui");
}
else {
// Altrimenti gestisco l'errore
Log.i("errore status code LVA", "devo gestire l'errore");
}
}
public void changeFollowStatus(String action, Item item){
Log.i("changeFollowStatus action", action);
if(action.contains("kFollowAction")) {
Log.i("changeFollowStatus", "1");
nextFollowAction = "kUnfollowAction";
followButton.setBackgroundResource(R.drawable.action_object_button_gray);
followButton.setText("seguito");
followButton.getTextOn();
increaseFollowers(item);
}
else if(action.contains("kUnfollowAction")){
Log.i("changeFollowStatus", "2");
nextFollowAction = "kFollowAction";
followButton.setBackgroundResource(R.drawable.action_object_button_green);
followButton.setText("segui");
followButton.getTextOff();
decreaseFollowers(item);
}
}
public void increaseFollowers(Item item){
int updatedFollowers = Integer.parseInt(item.getFollowers()) + 1;
item.setFollowers(Integer.toString(updatedFollowers));
followers.setText("Followers: " + item.getFollowers());
}
public void decreaseFollowers(Item item){
int updatedFollowers = Integer.parseInt(item.getFollowers()) - 1;
item.setFollowers(Integer.toString(updatedFollowers));
followers.setText("Followers: " + item.getFollowers());
}
@Override
public Integer processFinish(Integer result) {
Log.i("method processFinish", Integer.toString(result));
Log.i("method processFinish", "method");
return result;
}
/**
* Represents an asynchronous task used to download
* information from the webserver and display the results
*/
public class BackgroundTask extends AsyncTask<Long, Void, Integer> {
//public AsyncResponse delegate;
private AsyncResponse listener;
public BackgroundTask(AsyncResponse listener){
this.listener = listener;
}
@Override
protected Integer doInBackground(Long... params) {
// TODO: attempt authentication against a network service.
int i = MVPFunctions.getInstance().followItem(SessionManager.getUserDetails().get("login"), SessionManager.getUserDetails().get("password"), params[0], params[1].intValue());
Log.i("doInBackground", Integer.toString(i));
return i;
}
@Override
protected void onPreExecute(){
/*
* This is executed on UI thread before doInBackground(). It is
* the perfect place to show the progress dialog.
*/
}
@Override
protected void onPostExecute(Integer result) {
mBackgroundTask = null;
result1 = listener.processFinish(result);
//delegate.processFinish(result);
//ItemView
//Log.i("onPostExecute statusCode", Integer.toString(success) + " = " + Integer.toString(statusCode));
}
@Override
protected void onCancelled() {
mBackgroundTask = null;
//showProgress(false);
}
}
}
答案 0 :(得分：0)
如果我理解这一点，我认为ItemView.this将解决您的问题。
注意：正如评论中所指出的，您应该运行单个AsyncTask来遍历所有列表项，而不是为每个项创建新的AsyncTask。