我有一个列表视图适配器，一个getter - setter类和一个显示ListView的类。我想获取数据但数据不显示。我正在使用json数组。
有人能指出我的错误吗？
这是我的班级
public class MyorderActivity extends Activity {
private static final int SELECT_PICTURE_REQ = 1;
private ObjectGetter mObjectGetter;
private LoginSystem mLoginSystem;
// private ArrayAdapter<MyOrderItemData2> mItemsAdapter;
private ProgressDialog mProgressDialog;
private File mImageFile;
private ListView mListView;
private EmptyLayout mEmptyLayout;
ArrayList<MyOrder> mCities;
private boolean mUserImageChanged;
ActionBarActivity activity;
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
int ll;
MyOrderAdapter adapter;
String ss=null;
MyOrder my;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_myorder);
getActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#ff0000")));
MainApplication mainApplication = (MainApplication) getApplication();
mLoginSystem = mainApplication.getLoginSystem();
mProgressDialog = new ProgressDialog(this);
// activity = this;
// mCities = new ArrayList<MyOrderItemData2>();
//mItemsAdapter = new MenuItemsAdapter(MyorderActivity.this, mCities);
//mListView = (ListView)findViewById(R.id.listView156767577);
ll=mLoginSystem.getUserId();
ss=String.valueOf(ll);
Log.i("llllllllllll",""+ll);
Log.i("llllllllllll",ss);
new DownloadJSON().execute();
}
// DownloadJSON AsyncTask
private class DownloadJSON extends AsyncTask<Void,Void,Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(MyorderActivity.this);
// Set progressdialog title
mProgressDialog.setTitle("Downloading Restaurant....");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
Toast.makeText(MyorderActivity.this, "Successs", Toast.LENGTH_LONG).show();
}
@Override
protected Void doInBackground(Void... params) {
// Create an array
mCities = new ArrayList<MyOrder>();
// Retrieve JSON Objects from the given URL address
Log.i("123",""+ll);
jsonobject = JSONfunctions.getJSONfromURL("http://firstchoicefood.in/fcfapiphpexpert/phpexpert_OrderDisplay.php?user_id"+ ll);
Log.i("1234", "" +jsonobject);
// Toast.makeText(MyorderActivity.this,"sharma",Toast.LENGTH_LONG).show();
try {
// Locate the array name in JSON
jsonarray = jsonobject.getJSONArray("OrderViewResult");
Log.i("1234", "" + jsonarray);
// Toast.makeText(MyorderActivity.this,"sunder",Toast.LENGTH_LONG).show();
for (int i = 0; i < jsonarray.length(); i++) {
jsonobject = jsonarray.getJSONObject(i);
my=new MyOrder(jsonobject.getString("order_identifyno"),jsonobject.getString("restaurant_name"),jsonobject.getString("type"),jsonobject.getString("ordPrice"),jsonobject.getString("restaurant_id"),jsonobject.getString("user_date"));
mCities.add(my);
Log.i("my",""+my);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void args) {
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listView156767577);
// Pass the results into ListViewAdapter.java
adapter = new MyOrderAdapter(MyorderActivity.this,R.layout.myorderadapter,mCities);
// Set the adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
}
}
我有另一个类。有customer.Name的用户ID是LoginSystem。
public void tryRegistration（String name，String email，String password，String phone， 布尔订阅， final LoginSystemListener loginSystemListener）{ ObjectGetter objectGetter = new ObjectGetter（）; RequestParams requestParams = new RequestParams（）;
requestParams.put("user_name", name);
requestParams.put("user_email", email);
requestParams.put("user_pass", password);
requestParams.put("user_cellphone", phone);
requestParams.put("offerWant", subscription);
Log.d(TAG, "Attempting registration...");
objectGetter.postJsonObjectOrDialog(mContext, Urls.API_REGISTER, requestParams,
GenericResponse.class, new ObjectGetter.OnFinishedListener<GenericResponse>() {
@Override
public void onFinishedLoadingObject(GenericResponse response) {
if (response != null && response.isSucceded()) {
Log.d(TAG, "Registration succeded.");
loginSystemListener.onUserActionFinished(true);
} else {
Log.d(TAG, "Registration error.");
loginSystemListener.onUserActionFinished(false);
}
}
});
}
和适配器
public class MyOrderAdapter extends ArrayAdapter<MyOrder>{
Context context;
public MyOrderAdapter(Context context, int resourceId,
ArrayList<MyOrder> items) {
super(context, resourceId, items);
this.context = context;
}
/*private view holder class*/
private class ViewHolder {
TextView oderIN;
TextView name;
TextView type;
TextView price;
TextView showdetails;
TextView date1;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
MyOrder rowItem = getItem(position);
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView =mInflater.inflate(R.layout.myorderadapter,null);
holder = new ViewHolder();
holder.oderIN = (TextView) convertView.findViewById(R.id.textViewwerttt);
holder.name = (TextView) convertView.findViewById(R.id.textView123455);
holder.type = (TextView) convertView.findViewById(R.id.textView123);
holder.price = (TextView) convertView.findViewById(R.id.textView1234354);
holder.showdetails = (TextView) convertView.findViewById(R.id.textView1234354gfdfg);
holder.date1 = (TextView) convertView.findViewById(R.id.textView123455sadsa);
convertView.setTag(holder);
} else
holder = (ViewHolder) convertView.getTag();
holder.oderIN.setText(rowItem.getoderIN());
holder.name.setText(rowItem.getName());
holder.type.setText(rowItem.getType());
holder.price.setText(rowItem.getPrice());
holder.date1.setText(rowItem.getDate1());
holder.showdetails.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// context.startActivity(new Intent(context, ShowDetailsActivity.class));
}
});
return convertView;
}
错误是
06-11 13:48:16.365: E/AndroidRuntime(3062): FATAL EXCEPTION: main
06-11 13:48:16.365: E/AndroidRuntime(3062): Process: com.example.firstchoicefood, PID: 3062
06-11 13:48:16.365: E/AndroidRuntime(3062): java.lang.NullPointerException
06-11 13:48:16.365: E/AndroidRuntime(3062): at
06-11 13:48:16.365: E/AndroidRuntime(3062): at com.example.firstchoicefood.MyorderActivity$DownloadJSON.onPostExecute(MyorderActivity.java:1)
06-11 13:48:16.365: E/AndroidRuntime(3062): at android.os.AsyncTask.finish(AsyncTask.java:632)
06-11 13:48:16.365: E/AndroidRuntime(3062): at android.os.AsyncTask.access$600(AsyncTask.java:177)
06-11 13:48:16.365: E/AndroidRuntime(3062): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
06-11 13:48:16.365: E/AndroidRuntime(3062): at android.os.Handler.dispatchMessage(Handler.java:102)
06-11 13:48:16.365: E/AndroidRuntime(3062): at android.os.Looper.loop(Looper.java:136)
06-11 13:48:16.365: E/AndroidRuntime(3062): at android.app.ActivityThread.main(ActivityThread.java:5017)
06-11 13:48:16.365: E/AndroidRuntime(3062): at java.lang.reflect.Method.invokeNative(Native Method)
06-11 13:48:16.365: E/AndroidRuntime(3062): at java.lang.reflect.Method.invoke(Method.java:515)
06-11 13:48:16.365: E/AndroidRuntime(3062): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-11 13:48:16.365: E/AndroidRuntime(3062): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-11 13:48:16.365: E/AndroidRuntime(3062): at dalvik.system.NativeStart.main(Native Method)