我的 BaseAdapter 有问题。 当我将项目添加到 ListView 时，我得到以下信息:
当我一项一项删除项目时，我遇到了这个问题:
BaseAdapter.java
public class TipsterAdapter extends BaseAdapter implements ListAdapter {
private ArrayList<String> list = new ArrayList<String>();
private Context context;
AlertDialog dialog;
private static final int TYPE_ITEM = 0;
private static final int TYPE_SEPARATOR = 1;
private TreeSet<Integer> sectionHeader = new TreeSet<Integer>();
private LayoutInflater mInflater;
DataBase datb;
ImageButton removeBttn;
ImageButton editBttn;
Button visit;
public TipsterAdapter(Context context, DataBase datb) {
mInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.datb = datb;
this.context = context;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int pos) {
if(list.size() == 0) {
return null;
}
return list.get(pos);
}
@Override
public long getItemId(int pos) {
return pos;
//just return 0 if your list items do not have an Id variable.
}
public static class ViewHolder {
public TextView textView;
}
@Override
public int getItemViewType(int position) {
return sectionHeader.contains(position) ? TYPE_SEPARATOR : TYPE_ITEM;
}
@Override
public int getViewTypeCount() {
return 2;
}
public void addItem(final String item) {
list.add(item);
notifyDataSetChanged();
}
public void addSectionHeaderItem(final String item) {
list.add(item);
sectionHeader.add(list.size() - 1);
notifyDataSetChanged();
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
int rowType = getItemViewType(position);
final View bieg = convertView;
if (convertView == null) {
holder = new ViewHolder();
switch (rowType) {
case TYPE_ITEM:
convertView = mInflater.inflate(R.layout.row, null);
holder.textView = (TextView) convertView.findViewById(R.id.textView1);
removeBttn = (ImageButton)convertView.findViewById(R.id.remove_btn);
editBttn = (ImageButton)convertView.findViewById(R.id.edit_btn);
visit = (Button) convertView.findViewById(R.id.visitar);
if(getItem(position).toString().equals("Los tipsters agregados aparecerán aquí")) {
holder.textView.setTextSize(15);
removeBttn.setVisibility(View.INVISIBLE);
editBttn.setVisibility(View.INVISIBLE);
visit.setVisibility(View.INVISIBLE);
} else if (getItem(position).toString().equals("TasmaTenis ITF") || getItem(position).toString().equals("KrlosTM") || getItem(position).toString().equals("GreengoSIR") || getItem(position).toString().equals("Ribe Experience")) {
removeBttn.setVisibility(View.INVISIBLE);
editBttn.setVisibility(View.INVISIBLE);
visit.setVisibility(View.VISIBLE);
} else {
visit.setVisibility(View.INVISIBLE);
removeBttn.setVisibility(View.VISIBLE);
editBttn.setVisibility(View.VISIBLE);
}
visit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(getItem(position).toString().equals("KrlosTM")) {
String url = "https://t.me/KrlosTMpicks";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
context.startActivity(i);
} else if(getItem(position).toString().equals("TasmaTenis ITF")) {
String url = "https://t.me/TasmaPicksTenis";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
context.startActivity(i);
} else if(getItem(position).toString().equals("GreengoSIR")) {
String url = "https://t.me/GreengoSIR";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
context.startActivity(i);
} else if(getItem(position).toString().equals("Ribe Experience")) {
String url = "https://t.me/ribexperience";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
context.startActivity(i);
} else {
}
}
}
);
final View finalConvertView = convertView;
final ViewHolder finalHolder = holder;
removeBttn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
OperacionesBaseDatos db = new OperacionesBaseDatos();
db.eliminarTipster(getItem(position).toString());
Toast.makeText(v.getContext(), "Tipster borrado", Toast.LENGTH_LONG).show();
list.clear();
sectionHeader = new TreeSet<Integer>();
list = new ArrayList<String>();
notifyDataSetChanged();
Cursor cursor=datb.GetAllTipsterData();
list.clear();
addSectionHeaderItem("Mis Tipsters");
SQLiteDatabase db2 = datb.getWritableDatabase();
long numRows = DatabaseUtils.queryNumEntries(db2, "tipster");
if(numRows==0) {
final ImageButton removeBttn = (ImageButton) finalConvertView.findViewById(R.id.remove_btn);
final ImageButton editBttn = (ImageButton) finalConvertView.findViewById(R.id.edit_btn);
final Button visit = (Button) finalConvertView.findViewById(R.id.visitar);
Activity act = (Activity)context;
act.runOnUiThread(new Runnable(){
@Override
public void run() {
removeBttn.setVisibility(View.INVISIBLE);
editBttn.setVisibility(View.INVISIBLE);
visit.setVisibility(View.INVISIBLE);
} });
addItem("Los tipsters agregados aparecerán aquí");
}
while(cursor.moveToNext()) {
addItem(cursor.getString(0));
}
addSectionHeaderItem("Tipsters Recomendados");
addItem("TasmaTenis ITF");
addItem("KrlosTM");
addItem("GreengoSIR");
addItem("Ribe Experience");
datb.close();
notifyDataSetChanged();
}
});
editBttn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(final View v23) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(new ContextThemeWrapper(v23.getContext(), R.style.AlertDialogCustom));
alertDialog.setTitle("Editar Tipster");
alertDialog.setTitle("Editar Tipster");
alertDialog.setMessage("Escribe el nuevo nombre del tipster:");
final EditText input = new EditText(v23.getContext());
input.setTextColor(ContextCompat.getColor(v23.getContext(), android.R.color.black));
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT);
input.setLayoutParams(lp);
alertDialog.setView(input);
alertDialog.setPositiveButton("Cambiar",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
String fechaActual = Calendar.getInstance().getTime().toString();
//if (string.trim().length() == 0) {
try {
SQLiteDatabase db=datb.getWritableDatabase();
String sql="UPDATE tipster set nombre='" + input.getText().toString() + "' where nombre like '" + getItem(position).toString() + "'";
try{
db.execSQL(sql);
}catch(SQLException ex){
Log.d(TAG,"update data failure");
}
} finally {
Toast.makeText(v23.getContext(),
"Tipster modificado", Toast.LENGTH_SHORT).show();
}
list.clear();
sectionHeader = new TreeSet<Integer>();
Cursor cursor=datb.GetAllTipsterData();
addSectionHeaderItem("Mis Tipsters");
while(cursor.moveToNext()) {
addItem(cursor.getString(0));
}
addSectionHeaderItem("Tipsters Recomendados");
addItem("TasmaTenis ITF");
addItem("KrlosTM");
addItem("GreengoSIR");
addItem("Ribe Experience");
datb.close();
notifyDataSetChanged();
}
});
alertDialog.setNegativeButton("Cancelar",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
dialog = alertDialog.create();
dialog.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
}
});
input.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
// Check if edittext is empty
if (TextUtils.isEmpty(s) || s.toString().trim().length() == 0) {
// Disable ok button
((AlertDialog) dialog).getButton(
AlertDialog.BUTTON_POSITIVE).setEnabled(false);
} else {
// Something into edit text. Enable the button.
((AlertDialog) dialog).getButton(
AlertDialog.BUTTON_POSITIVE).setEnabled(true);
}
}
});
dialog.show();
notifyDataSetChanged();
}
});
break;
case TYPE_SEPARATOR:
convertView = mInflater.inflate(R.layout.listview_sections, null);
holder.textView = (TextView) convertView.findViewById(R.id.textSeparator);
break;
}
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(list.get(position));
View view = convertView;
//Handle TextView and display string from your list
//TextView listItemText = (TextView)view.findViewById(R.id.textView1);
//listItemText.setText(list.get(position));
//Handle buttons and add onClickListeners
//holder.textView.setText(list.get(position));
return view;
}
我在 Tipster.java 中这样调用它:
public void displayList(View view){
db = new DataBase ((MainActivity)getActivity());
Cursor cursor=db.GetAllTipsterData();
ArrayList<String> mArrayList = new ArrayList<String>();
adapter = new TipsterAdapter((MainActivity)getActivity(), db);
adapter.addSectionHeaderItem("Mis Tipsters");
Log.e("COLUMNAS: ", ""+cursor.getColumnCount());
SQLiteDatabase db2 = db.getWritableDatabase();
long numRows = DatabaseUtils.queryNumEntries(db2, "tipster");
if(numRows==0) {
adapter.addItem("Los tipsters agregados aparecerán aquí");
}
while(cursor.moveToNext()) {
adapter.addItem(cursor.getString(0));
}
adapter.addSectionHeaderItem("Tipsters Recomendados");
adapter.addItem("TasmaTenis ITF");
adapter.addItem("KrlosTM");
adapter.addItem("GreengoSIR");
adapter.addItem("Ribe Experience");
ListView lv = (ListView) view.findViewById(R.id.listita);
lv.setAdapter(adapter);
db.close();
}
行.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:paddingLeft="8dp"
android:textSize="20sp"
android:textStyle="bold" />
<ImageButton
android:id="@+id/remove_btn"
android:layout_width="50dp"
android:src="@drawable/ic_removebttn"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginRight="5dp"
android:layout_alignTop="@+id/edit_btn"
android:layout_alignBottom="@+id/edit_btn" />
<ImageButton
android:id="@+id/edit_btn"
android:layout_width="50dp"
android:src="@drawable/ic_editbttn"
android:layout_height="50dp"
android:layout_toLeftOf="@id/remove_btn"
android:layout_centerVertical="true"
android:layout_marginRight="10dp" />
<Button
android:text="Visitar"
android:layout_width="89dp"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/remove_btn"
android:id="@+id/visitar"
android:visibility="gone"
android:layout_alignRight="@+id/remove_btn"
android:layout_alignEnd="@+id/remove_btn" />
listview_sections.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#52b1ff"
android:gravity="center_vertical" >
<TextView
android:id="@+id/textSeparator"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="8dp"
android:text=""
android:textAllCaps="true"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#ffffff"
android:textStyle="bold"
android:visibility="visible" />
</LinearLayout>
希望有人能帮助我。谢谢!
最佳答案
请务必通过适配器添加和删除 ListView 的项目。添加/删除项目后，调用下面的函数来反射(reflect)您的更改。
adapter.notifyDataSetChanged();
希望这对您有用。
关于java - 使用 BaseAdapter 删除 ListView 中的项目，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42149415/