我得到了这个Nullpointer异常，我不明白为什么。我已经研究并知道getCount返回null，但我不明白为什么。我试图解析一个JSON数组并将该信息发送到自定义适配器以显示自定义列表视图。在过去的7天里，我一直都是圆形的。该应用程序正在工作并从静态JSON文件中提取数据。我需要在更新数据库时更新feed，因此静态JSON不是一个好的解决方案。我最终屏幕只显示白色，没有任何细节。我可以在普通列表视图中显示数据，但不能在膨胀视图中显示数据。在解决空白屏幕之前，我必须清除此异常。这是主要活动，自定义适配器和模型的代码。我希望有人可以看一看并给予帮助。
logcat的
12-19 01:02:58.516 32588-32588/com.brasiltradefx.btfxalerts E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.brasiltradefx.btfxalerts, PID: 32588
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.brasiltradefx.btfxalerts/com.brasiltradefx.btfxalertsadmin.AlertMainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2350)
at android.app.ActivityThread.access$800(ActivityThread.java:163)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1257)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5335)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.brasiltradefx.btfxalertsadmin.adapter.FeedListAdapter.getCount(FeedListAdapter.java:48)
at android.widget.ListView.setAdapter(ListView.java:486)
at com.brasiltradefx.btfxalertsadmin.AlertMainActivity.onCreate(AlertMainActivity.java:46)
主要活动（已更新）
public class AlertMainActivity extends Activity {
private String url = "http://www.contrariantradefx.info/android/btfxalerts/alerts_all_data_clients.php";
ProgressDialog PD;
ArrayList<String> feedItems;
FeedListAdapter listadapter;
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_alert_main);
listView = (ListView)findViewById(R.id.list);
feedItems = new ArrayList<>();
PD = new ProgressDialog(this);
PD.setMessage("Loading...");
PD.setCancelable(false);
listadapter = new FeedListAdapter(this, feedItems);
listView.setAdapter(listadapter);
MakeJsonArrayReq();
}
private void MakeJsonArrayReq() {
PD.show();
JsonArrayRequest jreq = new JsonArrayRequest(url, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jo = response.getJSONObject(i);
String date = jo.getString("date");
String order = jo.getString("order");
String pair = jo.getString("pair");
String rate = jo.getString("rate");
String quick_target = jo.getString("quick_target");
String long_target = jo.getString("long_target");
String stop_loss = jo.getString("stop_loss");
String break_even = jo.getString("break_even");
String name = jo.getString("name");
String status = jo.getString("status");
String profilePic = jo.getString("profilePic");
String image = jo.isNull("image")? null : jo.getString("image");
FeedItem item = new FeedItem();
item.setDate(date);
item.setOrder_type(order);
item.setPair(pair);
item.setRate(rate);
item.setQuick_target(quick_target);
item.setLong_target(long_target);
item.setStop_loss(stop_loss);
item.setBreak_Even(break_even);
item.setName(name);
item.setStatus(status);
item.setProfilePic(profilePic);
item.setImge(image);
feedItems.add(feedItems); // (feedItems)this is saying add(java.lang.String) in ArrayList cannot be applied to(java.util.ArrayList<java.lang.String
} catch (JSONException e) {
e.printStackTrace();
}
}
PD.dismiss();
listadapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
AppController.getInstance().addToRequestQueue(jreq, "jreq");
}
}
FeedListAdapter （已更新）
public class FeedListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private ArrayList<FeedItem> feedItems;
int size=0 ;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public FeedListAdapter(AlertMainActivity activity, ArrayList<String> feedItems) {
this.activity = activity;
this.feedItems = feedItems; // this is saying incompatible types. required ArrayList com.brasiltradefx.btfxalertsadmin.data.FeedItem
found ArrayList java.lang.String
if(this.feedItems !=null && !this.feedItems.isEmpty()){
size = this.feedItems.size();
}
}
@Override
public int getCount() {
return feedItems.size();
}
@Override
public Object getItem(int location) {
return feedItems.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.feed_item, null);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
TextView name = (TextView) convertView.findViewById(R.id.txtname);
TextView date = (TextView) convertView
.findViewById(R.id.txtdate);
TextView statusMsg = (TextView) convertView
.findViewById(R.id.txtStatusMsg);
TextView order_type = (TextView) convertView.findViewById(R.id.txtOrderType);
TextView pair = (TextView) convertView.findViewById(R.id.txtPair);
TextView rate = (TextView) convertView.findViewById(R.id.txtRate);
TextView quick_target = (TextView) convertView.findViewById(R.id.txtQuick_Target);
TextView long_target = (TextView) convertView.findViewById(R.id.txtLong_Target);
TextView stop_loss = (TextView) convertView.findViewById(R.id.txtStop_Loss);
TextView break_even = (TextView) convertView.findViewById(R.id.txtBreak_Even);
NetworkImageView profilePic = (NetworkImageView) convertView.findViewById(R.id.profilePic);
FeedImageView feedImageView = (FeedImageView) convertView
.findViewById(R.id.feedImage1);
FeedItem item = feedItems.get(position);
name.setText(item.getName());
date.setText(item.getDate());
order_type.setText(item.getOrder_type());
pair.setText(item.getPair());
rate.setText(item.getRate());
quick_target.setText(item.getQuick_target());
long_target.setText(item.getLong_target());
stop_loss.setText(item.getStop_loss());
break_even.setText(item.getBreak_Even());
//Converting timestamp into x ago format - removed timeStamp - using date
//CharSequence timeAgo = DateUtils.getRelativeTimeSpanString(
//Long.parseLong(item.getTimeStamp()),
//System.currentTimeMillis(), DateUtils.SECOND_IN_MILLIS);
//timestamp.setText(timeAgo);
// Chcek for empty status message
if (!TextUtils.isEmpty(item.getStatus())) {
statusMsg.setText(item.getStatus());
statusMsg.setVisibility(View.VISIBLE);
} else {
// status is empty, remove from view
statusMsg.setVisibility(View.GONE);
}
// Checking for null feed url
//if (item.getUrl() != null) {
//url.setText(Html.fromHtml("<a href=\"" + item.getUrl() + "\">"
//+ item.getUrl() + "</a> "));
// Making url clickable
//url.setMovementMethod(LinkMovementMethod.getInstance());
//url.setVisibility(View.VISIBLE);
//} else {
// url is null, remove from the view
//url.setVisibility(View.GONE);
//}
// user profile pic
profilePic.setImageUrl(item.getProfilePic(), imageLoader);
// Feed image
if (item.getImge() != null) {
feedImageView.setImageUrl(item.getImge(), imageLoader);
feedImageView.setVisibility(View.VISIBLE);
feedImageView
.setResponseObserver(new FeedImageView.ResponseObserver() {
@Override
public void onError() {
}
@Override
public void onSuccess() {
}
});
} else {
feedImageView.setVisibility(View.GONE);
}
return convertView;
}
}
feed_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/feed_bg"
android:orientation="vertical"
android:showDividers="end">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingLeft="@dimen/feed_item_padding_left_right"
android:paddingRight="@dimen/feed_item_padding_left_right"
android:background="#050505">
<com.android.volley.toolbox.NetworkImageView
android:id="@+id/profilePic"
android:layout_width="@dimen/feed_item_profile_pic"
android:layout_height="@dimen/feed_item_profile_pic"
android:scaleType="fitCenter"
android:layout_marginTop="15dp">
</com.android.volley.toolbox.NetworkImageView>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingLeft="@dimen/feed_item_profile_info_padd" >
<TextView
android:id="@+id/txtname"
android:layout_width="fill_parent"
android:layout_height="25dp"
android:textSize="@dimen/feed_item_profile_name"
android:textStyle="bold"
android:background="#3452aa"
android:layout_marginTop="10dp"
android:textColor="#ffffff"
android:textAlignment="center" />
<TextView
android:id="@+id/txtdate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#ffffff"
android:textSize="@dimen/feed_item_date"
android:layout_marginTop="10dp"
android:gravity="right" />
<TextView
android:id="@+id/txtStatusMsg"
android:layout_width="157dp"
android:layout_height="wrap_content"
android:paddingBottom="5dp"
android:paddingLeft="@dimen/feed_item_status_pad_left_right"
android:paddingRight="@dimen/feed_item_status_pad_left_right"
android:paddingTop="@dimen/feed_item_status_pad_top"
android:layout_marginTop="10dp"
android:textColor="#ffffff"
android:gravity="right"
android:background="#3452aa"
android:layout_gravity="right" />
</LinearLayout>
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/txtBreak_Even"
android:layout_width="match_parent"
android:layout_height="40dp"
android:paddingBottom="5dp"
android:paddingLeft="@dimen/feed_item_status_pad_left_right"
android:paddingRight="@dimen/feed_item_status_pad_left_right"
android:paddingTop="@dimen/feed_item_status_pad_top"
android:background="#f8fe5a"
android:textColor="#000000"
android:layout_alignBottom="@+id/textViewBreakEven"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_below="@+id/txtStop_Loss"
android:layout_marginLeft="120dp"
android:layout_marginTop="5dp"
android:textAlignment="center"
android:layout_marginRight="5dp"
android:gravity="center_vertical"
android:textSize="18sp" />
<TextView
android:id="@+id/txtLong_Target"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:paddingBottom="5dp"
android:paddingLeft="@dimen/feed_item_status_pad_left_right"
android:paddingRight="@dimen/feed_item_status_pad_left_right"
android:paddingTop="@dimen/feed_item_status_pad_top"
android:background="#FF3CF14C"
android:textColor="#000000"
android:layout_below="@+id/txtQuick_Target"
android:layout_alignLeft="@+id/txtQuick_Target"
android:layout_alignStart="@+id/txtQuick_Target"
android:layout_marginTop="5dp"
android:textAlignment="center"
android:layout_marginRight="5dp"
android:gravity="center_vertical"
android:textSize="18sp" />
<TextView
android:id="@+id/txtQuick_Target"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:paddingBottom="5dp"
android:paddingLeft="@dimen/feed_item_status_pad_left_right"
android:paddingRight="@dimen/feed_item_status_pad_left_right"
android:paddingTop="@dimen/feed_item_status_pad_top"
android:background="#3cf14c"
android:textColor="#000000"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="120dp"
android:layout_marginTop="5dp"
android:layout_below="@+id/txtRate"
android:textAlignment="center"
android:layout_marginRight="5dp"
android:gravity="center_vertical"
android:textSize="18sp" />
<TextView
android:id="@+id/txtStop_Loss"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:paddingBottom="5dp"
android:paddingLeft="@dimen/feed_item_status_pad_left_right"
android:paddingRight="@dimen/feed_item_status_pad_left_right"
android:paddingTop="@dimen/feed_item_status_pad_top"
android:background="#FFFC5964"
android:textColor="#000000"
android:layout_below="@+id/txtLong_Target"
android:layout_marginLeft="120dp"
android:layout_marginTop="5dp"
android:textAlignment="center"
android:layout_marginRight="5dp"
android:gravity="center_vertical"
android:textSize="18sp" />
<TextView
android:id="@+id/txtRate"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:paddingBottom="5dp"
android:paddingLeft="@dimen/feed_item_status_pad_left_right"
android:paddingRight="@dimen/feed_item_status_pad_left_right"
android:paddingTop="@dimen/feed_item_status_pad_top"
android:background="#FF6AC1F7"
android:textColor="#000000"
android:layout_below="@+id/txtPair"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="120dp"
android:layout_marginTop="5dp"
android:textAlignment="center"
android:layout_marginRight="5dp"
android:gravity="center_vertical"
android:textSize="18sp" />
<TextView
android:id="@+id/txtPair"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:paddingBottom="5dp"
android:paddingLeft="@dimen/feed_item_status_pad_left_right"
android:paddingRight="@dimen/feed_item_status_pad_left_right"
android:paddingTop="@dimen/feed_item_status_pad_top"
android:background="#FF6AC1F7"
android:textColor="#000000"
android:layout_below="@+id/txtOrderType"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="120dp"
android:layout_marginTop="5dp"
android:textAlignment="center"
android:layout_marginRight="5dp"
android:gravity="center_vertical"
android:textSize="18sp" />
<TextView
android:id="@+id/txtOrderType"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:paddingBottom="5dp"
android:paddingLeft="@dimen/feed_item_status_pad_left_right"
android:paddingRight="@dimen/feed_item_status_pad_left_right"
android:paddingTop="@dimen/feed_item_status_pad_top"
android:background="#FF6AC1F7"
android:textColor="#000000"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp"
android:layout_toRightOf="@+id/textViewOrder_Type"
android:layout_marginLeft="120dp"
android:textAlignment="center"
android:layout_marginRight="5dp"
android:gravity="center_vertical"
android:textSize="18sp" />
<TextView
android:layout_width="110dp"
android:layout_height="40dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="BreakEven"
android:id="@+id/textViewBreakEven"
android:background="#FFF8FE5A"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/txtStop_Loss"
android:layout_marginTop="5dp"
android:textColor="#000000"
android:layout_marginLeft="5dp"
android:gravity="center_vertical|right"
android:textSize="18sp" />
<TextView
android:layout_width="110dp"
android:layout_height="40dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="StopLoss"
android:id="@+id/textViewStop_Loss"
android:background="#fc5964"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/txtLong_Target"
android:layout_marginTop="5dp"
android:textColor="#000000"
android:singleLine="false"
android:layout_marginLeft="5dp"
android:gravity="center_vertical|right"
android:textSize="18sp" />
<TextView
android:layout_width="110dp"
android:layout_height="40dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Long Target"
android:id="@+id/textViewLong_Target"
android:background="#FF3CF14C"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/txtQuick_Target"
android:layout_marginTop="5dp"
android:textColor="#000000"
android:layout_marginLeft="5dp"
android:gravity="center_vertical|right"
android:textSize="18sp" />
<TextView
android:layout_width="110dp"
android:layout_height="40dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Quick Target"
android:background="#FF3CF14C"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/txtRate"
android:layout_marginTop="5dp"
android:textColor="#000000"
android:id="@+id/textViewQuick_Target"
android:layout_marginLeft="5dp"
android:gravity="center_vertical|right"
android:textSize="18sp" />
<TextView
android:layout_width="110dp"
android:layout_height="40dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Rate"
android:id="@+id/textViewRate"
android:background="#FF6AC1F7"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/txtPair"
android:layout_marginTop="5dp"
android:textColor="#000000"
android:layout_marginLeft="5dp"
android:gravity="center_vertical|right"
android:textSize="18sp" />
<TextView
android:layout_width="110dp"
android:layout_height="40dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Pair"
android:id="@+id/textViewPair"
android:background="#FF6AC1F7"
android:layout_below="@+id/txtOrderType"
android:layout_alignParentStart="true"
android:layout_marginTop="5dp"
android:textColor="#000000"
android:layout_marginLeft="5dp"
android:gravity="center_vertical|right"
android:textSize="18sp" />
<TextView
android:layout_width="110dp"
android:layout_height="40dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Order Type"
android:id="@+id/textViewOrder_Type"
android:background="#6ac1f7"
android:layout_alignTop="@+id/txtOrderType"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textColor="#000000"
android:layout_alignParentBottom="false"
android:layout_marginLeft="5dp"
android:gravity="center_vertical|right"
android:textSize="18sp" />
</RelativeLayout>
<com.brasiltradefx.btfxalertsadmin.FeedImageView
android:id="@+id/feedImage1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:scaleType="fitXY"
android:visibility="visible" />
</LinearLayout>
答案 0 :(得分：1)
删除其他两个contructer＆amp;给出构造函数中给出的大小。
public class FeedListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private ArrayList<FeedItem> feedItems;
int size =0 ;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public FeedListAdapter(Activity activity, ArrayList<FeedItem> feedItems) {
this.activity = activity;
this.feedItems = feedItems;
if(this.feedItems !=null && !this.feedItems.isEmpty()){
size = this.feedItems.size();
}
}
@Override
public int getCount() {
return size;
}
@Override
public Object getItem(int location) {
return feedItems.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.feed_item, null);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
TextView name = (TextView) convertView.findViewById(R.id.txtname);
TextView date = (TextView) convertView
.findViewById(R.id.txtdate);
TextView statusMsg = (TextView) convertView
.findViewById(R.id.txtStatusMsg);
TextView order_type = (TextView) convertView.findViewById(R.id.txtOrderType);
TextView pair = (TextView) convertView.findViewById(R.id.txtPair);
TextView rate = (TextView) convertView.findViewById(R.id.txtRate);
TextView quick_target = (TextView) convertView.findViewById(R.id.txtQuick_Target);
TextView long_target = (TextView) convertView.findViewById(R.id.txtLong_Target);
TextView stop_loss = (TextView) convertView.findViewById(R.id.txtStop_Loss);
TextView break_even = (TextView) convertView.findViewById(R.id.txtBreak_Even);
NetworkImageView profilePic = (NetworkImageView) convertView.findViewById(R.id.profilePic);
FeedImageView feedImageView = (FeedImageView) convertView
.findViewById(R.id.feedImage1);
FeedItem item = feedItems.get(position);
name.setText(item.getName());
date.setText(item.getDate());
order_type.setText(item.getOrder_type());
pair.setText(item.getPair());
rate.setText(item.getRate());
quick_target.setText(item.getQuick_target());
long_target.setText(item.getLong_target());
stop_loss.setText(item.getStop_loss());
break_even.setText(item.getBreak_Even());
//Converting timestamp into x ago format - removed timeStamp - using date
//CharSequence timeAgo = DateUtils.getRelativeTimeSpanString(
//Long.parseLong(item.getTimeStamp()),
//System.currentTimeMillis(), DateUtils.SECOND_IN_MILLIS);
//timestamp.setText(timeAgo);
// Chcek for empty status message
if (!TextUtils.isEmpty(item.getStatus())) {
statusMsg.setText(item.getStatus());
statusMsg.setVisibility(View.VISIBLE);
} else {
// status is empty, remove from view
statusMsg.setVisibility(View.GONE);
}
// Checking for null feed url
//if (item.getUrl() != null) {
//url.setText(Html.fromHtml("<a href=\"" + item.getUrl() + "\">"
//+ item.getUrl() + "</a> "));
// Making url clickable
//url.setMovementMethod(LinkMovementMethod.getInstance());
//url.setVisibility(View.VISIBLE);
//} else {
// url is null, remove from the view
//url.setVisibility(View.GONE);
//}
// user profile pic
profilePic.setImageUrl(item.getProfilePic(), imageLoader);
// Feed image
if (item.getImge() != null) {
feedImageView.setImageUrl(item.getImge(), imageLoader);
feedImageView.setVisibility(View.VISIBLE);
feedImageView
.setResponseObserver(new FeedImageView.ResponseObserver() {
@Override
public void onError() {
}
@Override
public void onSuccess() {
}
});
} else {
feedImageView.setVisibility(View.GONE);
}
return convertView;
}
您还需要将数据设置为FeedItem＆amp;在Arraylist中添加它
private void MakeJsonArrayReq() {
PD.show();
JsonArrayRequest jreq = new JsonArrayRequest(url, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jo = response.getJSONObject(i);
String date = jo.getString("date");
String order = jo.getString("order");
String pair = jo.getString("pair");
String rate = jo.getString("rate");
String quick_target = jo.getString("quick_target");
String long_target = jo.getString("long_target");
String stop_loss = jo.getString("stop_loss");
String break_even = jo.getString("break_even");
String name = jo.getString("name");
String status = jo.getString("status");
String profilePic = jo.getString("profilePic");
String image = jo.isNull("image")? null : jo.getString("image");
FeedItem item = new FeedItem ();
item.setOrder(order);
item.setName(name);
//like this dont know about method name of item
feedItems.add(item);
} catch (JSONException e) {
e.printStackTrace();
}
}
PD.dismiss();
// set adapter here
listadapter = new FeedListAdapter(this, feedItems);
listView.setAdapter(listadapter);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
AppController.getInstance().addToRequestQueue(jreq, "jreq");
}
答案 1 :(得分：0)
因为您在feedItems
首先调用您的方法来填充您的Feeditems。
MakeJsonArrayReq();
listadapter = new FeedListAdapter(this, feedItems);
listView.setAdapter(listadapter);
答案 2 :(得分：0)
更改
public FeedListAdapter(Activity activity, ArrayList<FeedItem> feedItems) {
this.activity = activity;
this.feedItems = feedItems;
}
public FeedListAdapter(AlertMainActivity activity, ArrayList<String> feedItems) {
}
到
public FeedListAdapter(Activity activity, ArrayList<FeedItem> feedItems) {
}
public FeedListAdapter(AlertMainActivity activity, ArrayList<String> feedItems) {
this.activity = activity;
this.feedItems = feedItems;
}