我有一个问题，我有一个活动和一个dialogfragment。当我点击对话框中的按钮时，我将模型发送到Activity并将此模型写入列表。但是当我向列表中添加多个元素时，我的listview会复制第一个元素，我在onCreate()中初始化我的适配器并在onExcerciseAdd中添加新信息：
活性：
public class AddTrainingActivity extends ActionBarActivity implements ExcercisesFragment.onButtonAdd {
private ActionBarDrawerToggle toggle;
int DIALOG_TIME = 1;
int myHour = 00;
int myMinute = 00;
TextView tvTime;
Button btn_add_ex;
ListView list;
ExcerciseAdapter adapter;
ArrayList<ExcerciseModel> excercise_list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_addtraining);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
tvTime = (TextView) findViewById(R.id.tv_time_add);
tvTime.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showDialog(DIALOG_TIME);
}
});
btn_add_ex = (Button) findViewById(R.id.btn_add_exercise);
list = (ListView) findViewById(R.id.list_excercise);
excercise_list = new ArrayList<ExcerciseModel>();
Log.d("onCreate", "Work!");
adapter = new ExcerciseAdapter(excercise_list, this);
btn_add_ex.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ExcercisesFragment dlg = new ExcercisesFragment();
dlg.show(getSupportFragmentManager(),"dlg");
}
});
}
protected Dialog onCreateDialog(int id) {
if (id == DIALOG_TIME) {
Calendar c = Calendar.getInstance();
myHour = c.getTime().getHours();
myMinute = c.getTime().getMinutes();
TimePickerDialog tpd = new TimePickerDialog(this, myCallBack, myHour, myMinute, true);
return tpd;
}
return super.onCreateDialog(id);
}
TimePickerDialog.OnTimeSetListener myCallBack = new TimePickerDialog.OnTimeSetListener() {
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
myHour = hourOfDay;
myMinute = minute;
if (myMinute < 10) {
tvTime.setText(myHour + " : 0" + myMinute );
} else {
tvTime.setText(myHour + " : " + myMinute );
}
Log.d("TIME", "minutes " + myMinute);
}
};
@Override
public void onExcerciseAdd(ExcerciseModel model) {
Log.d("Adapter", "null? " + (adapter.isEmpty()));
excercise_list.add(model);
if (adapter.isEmpty()) {
runOnUiThread(new Runnable() {
@Override
public void run() {
adapter.notifyDataSetInvalidated();
adapter.notifyDataSetChanged();
list.invalidate();
list.invalidateViews();
}
});
}
list.setAdapter(adapter);
for (int i = 0; i < excercise_list.size(); i++){
Log.d("List_ex", "list(" + i +"): " + excercise_list.get(i).getTitle().toString());
}
}
}
Dialogfragment：
public class ExcercisesFragment extends DialogFragment {
private Button btn_add_dialog;
private EditText edit_time;
private EditText edit_count1;
private EditText edit_count2;
private EditText edit_weight;
private AutoCompleteTextView edit_ex;
public interface onButtonAdd {
void onExcerciseAdd (ExcerciseModel model);
}
onButtonAdd button_add;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getDialog().setTitle("Title!");
View v = inflater.inflate(R.layout.fragment_add_excersise, null);
btn_add_dialog = (Button) v.findViewById(R.id.btn_add_exercise_fr);
edit_time = (EditText) v.findViewById(R.id.edit_ex_go);
edit_count1 = (EditText) v.findViewById(R.id.edit_podh);
edit_count2 = (EditText) v.findViewById(R.id.edit_repeat);
edit_weight = (EditText) v.findViewById(R.id.edit_weight_add);
edit_ex = (AutoCompleteTextView) v.findViewById(R.id.excercise_title);
button_add = (onButtonAdd) getActivity();
Resources res = getResources();
String[] excersices = res.getStringArray(R.array.excersices);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
R.layout.profile_item, R.id.item_autotext, excersices);
adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
edit_ex.setAdapter(adapter);
edit_ex.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_ENTER) {
// Just ignore the [Enter] key
return true;
}
// Handle all other keys in the default way
return false;
}
});
edit_ex.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
edit_ex.showDropDown();
}
});
btn_add_dialog.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String time = edit_time.getText().toString();
String title = edit_ex.getText().toString();
String weight = edit_weight.getText().toString();
String count1 = edit_count1.getText().toString();
String count2 = edit_count2.getText().toString();
if (title.equals("") || count1.equals("") || count2.equals("") || weight.equals("") || time.equals("")) {
Toast.makeText(getActivity(),"Необходимо заполнить все поля", Toast.LENGTH_SHORT).show();
} else {
ExcerciseModel model = new ExcerciseModel();
model.setTitle(edit_ex.getText().toString());
model.setTime(Integer.parseInt(edit_time.getText().toString()));
model.setPodh(Integer.parseInt(edit_count1.getText().toString()));
model.setCount(Integer.parseInt(edit_count2.getText().toString()));
model.setWeight(Integer.parseInt(edit_weight.getText().toString()));
button_add.onExcerciseAdd(model);
dismiss();
}
}
});
return v;
}
}
和适配器：
public class ExcerciseAdapter extends BaseAdapter {
ArrayList<ExcerciseModel> list;
Activity context;
public ExcerciseAdapter (ArrayList<ExcerciseModel> list, Activity context) {
this.list = list;
this.context = context;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
private class ViewHolder {
TextView txtViewTitle;
TextView txtViewTime;
TextView txtViewPodh;
TextView txtViewCount;
TextView txtViewWeight;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
Log.d("ConvertView", "convertview is null " + (convertView == null));
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_item_ex, null);
holder = new ViewHolder();
holder.txtViewTitle = (TextView) convertView.findViewById(R.id.tv_adapter_title);
holder.txtViewTime = (TextView) convertView.findViewById(R.id.tv_adapter_time_get);
holder.txtViewPodh = (TextView) convertView.findViewById(R.id.tv_adapter_podh_get);
holder.txtViewCount = (TextView) convertView.findViewById(R.id.tv_adapter_count_get);
holder.txtViewWeight = (TextView) convertView.findViewById(R.id.tv_adapter_weight_get);
holder.txtViewTitle.setText(list.get(position).getTitle().toString());
holder.txtViewTime.setText(String.valueOf(list.get(position).getTime()));
holder.txtViewPodh.setText(String.valueOf(list.get(position).getPodh()));
holder.txtViewCount.setText(String.valueOf(list.get(position).getCount()));
holder.txtViewWeight.setText(String.valueOf(list.get(position).getWeight()));
} else {
holder = (ViewHolder) convertView.getTag();
}
Log.d("Adapter", "List_size = " +list.size());
Log.d("Adapter", "Title(" + position + "): " + list.get(position).getTitle().toString());
return convertView;
}
}
我不知道，但是当我添加一个元素时，Adatper会拨打太多次电话。请帮我解决这个问题。
答案 0 :(得分：1)
您只在创建列表项时更新它们。你应该这样做：
LayoutInflater inflater = context.getLayoutInflater();
View view = (convertView == null)? inflater.inflate(R.layout.list_item_ex, parent, false) : convertView;
holder = new ViewHolder();
holder.txtViewTitle = (TextView) convertView.findViewById(R.id.tv_adapter_title);
holder.txtViewTime = (TextView) convertView.findViewById(R.id.tv_adapter_time_get);
holder.txtViewPodh = (TextView) convertView.findViewById(R.id.tv_adapter_podh_get);
holder.txtViewCount = (TextView) convertView.findViewById(R.id.tv_adapter_count_get);
holder.txtViewWeight = (TextView) convertView.findViewById(R.id.tv_adapter_weight_get);
holder.txtViewTitle.setText(list.get(position).getTitle().toString());
holder.txtViewTime.setText(String.valueOf(list.get(position).getTime()));
holder.txtViewPodh.setText(String.valueOf(list.get(position).getPodh()));
holder.txtViewCount.setText(String.valueOf(list.get(position).getCount()));
holder.txtViewWeight.setText(String.valueOf(list.get(position).getWeight()));
return view;
此外，更改数据集时无需调用所有这些方法
adapter.notifyDataSetInvalidated();
adapter.notifyDataSetChanged();
list.invalidate();
list.invalidateViews();
调用adapter.notifyDataSetChanged（）;应该够了
每次更改数据时也不需要重置适配器，因此也可以删除此行
list.setAdapter(adapter);