我需要将选中的复选框保存到sqlite database，因为如果我选中checkbox并点击其他tab，点击上一个标签后，则不会选中现在选中前的复选框。 ...
我向你求婚！
提前致谢！
这是我的代码：
ADAPTER：
public abstract class PlanetAdapter extends ArrayAdapter<Planet> implements CompoundButton.OnCheckedChangeListener
{
private List<Planet> planetList;
private Context context;
ArrayList<Birra> objects;
SharedPreferences settings;
public boolean Checked;
public PlanetAdapter(List<Planet> planetList, Context context) {
super(context, R.layout.single_listview_item, planetList);
settings = context.getSharedPreferences("data", Context.MODE_PRIVATE);
this.planetList = planetList;
this.context = context;
}
public class PlanetHolder {
public TextView planetName;
public TextView distView;
public TextView valuta;
public CheckBox chkBox;
public EditText edit;
//public String quantità;
public boolean checked;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View row = convertView;
PlanetHolder holder = null;
if (row == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = inflater.inflate(R.layout.single_listview_item, parent, false);
holder = new PlanetHolder();
holder.planetName = (TextView) row.findViewById(R.id.name);
holder.distView = (TextView) row.findViewById(R.id.dist);
holder.valuta = (TextView) row.findViewById(R.id.valuta);
holder.chkBox = (CheckBox) row.findViewById(R.id.chk_box);
holder.edit = (EditText) row.findViewById(R.id.editText);
holder.edit.setVisibility(View.GONE);
holder.edit.setEnabled(false);
row.setTag(holder);
} else {
holder = (PlanetHolder) row.getTag();
}
final Planet p = planetList.get(position);
settings = context.getSharedPreferences("data", Context.MODE_PRIVATE);
Checked= settings.getBoolean("Material", false);
if(Checked) {
// System.out.println(Checked);
holder.chkBox.setChecked(true);
}else{
System.out.println(Checked);
}
final PlanetHolder finalHolder = holder;
holder.chkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (finalHolder.chkBox.isChecked()) {
finalHolder.edit.setVisibility(View.VISIBLE);
finalHolder.edit.setEnabled(true);
settings.edit().putBoolean("Material", finalHolder.chkBox.isChecked()).commit();
System.out.println("presa");
} else {
finalHolder.edit.setVisibility(View.GONE);
finalHolder.edit.setEnabled(false);
finalHolder.edit.setText("");
settings.edit().putBoolean("Material", finalHolder.chkBox.isChecked()).commit();
}
}
});
finalHolder.edit.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
p.setQuantità(finalHolder.edit.getText().toString().trim());
}
});
holder.planetName.setText(p.getName());
holder.distView.setText("" + p.getDistance());
holder.valuta.setText(""+p.getValuta());
holder.chkBox.setChecked(p.isSelected());
holder.chkBox.setTag(p);
holder.edit.setEnabled(false);
return row;
}
ArrayList<Planet> getBox() {
ArrayList<Planet> box = new ArrayList<Planet>();
for (Planet p : planetList) {
if (p.selected)
box.add(p);
}
return box;
}
}
FRAGMENT：
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_list2, container, false);
/*mSharedPreferences = getContext().getSharedPreferences("data", Context.MODE_PRIVATE);
Boolean mIsChecked = mSharedPreferences.getBoolean("zao", false);
holder.chkBox.setChecked(mIsChecked);*/
/* SharedPreferences settings = getContext().getSharedPreferences("data", Context.MODE_PRIVATE);
boolean Checked = settings.getBoolean("Material", false);
//holder.chkBox.setChecked(Checked);
if (Checked == true){ //false is default value
holder.chkBox.setChecked(true); //it was checked
} else{
holder.chkBox.setChecked(false);
}*/
Button mButton = (Button) rootView.findViewById(R.id.button);
mButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showResult(v);
}
});
//return inflater.inflate(R.layout.fragment_list2, container, false);
return rootView;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
lv = (ListView)getView().findViewById(R.id.listview);
displayPlanetList();
}
private void displayPlanetList() {
planetList = new ArrayList<Planet>();
planetList.add(new Planet("Margherita", 6, "€"));
planetList.add(new Planet("Diavola", 7,"€"));
planetList.add(new Planet("Bufalina", 5,"€"));
planetList.add(new Planet("Marinara", 5, "€"));
planetList.add(new Planet("Viennese", 4, "€"));
plAdapter = new PlanetAdapter(planetList, getContext()) {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
int pos = lv.getPositionForView(buttonView);
if (pos != ListView.INVALID_POSITION) {
Planet p = planetList.get(pos);
p.setSelected(isChecked);
/*Toast.makeText(
getActivity(),
"Clicked on Pizza: " + p.getName() + ". State: is "
+ isChecked, Toast.LENGTH_SHORT).show();*/
}
}
};
lv.setAdapter(plAdapter);
//plAdapter.notifyDataSetChanged();
}
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
/*int pos = lv.getPositionForView(buttonView);
if (pos != ListView.INVALID_POSITION) {
Planet p = planetList.get(pos);
p.setSelected(isChecked);
*//*Toast.makeText(
getActivity(),
"Clicked on Planet: " + p.getName() + ". State: is "
+ isChecked, Toast.LENGTH_SHORT).show();*//*
}*/
}
public void showResult(View v) {
String result2 = "Selected Product are :";
int totalAmount2=0;
String a="";
for (Birra b : biAdapter.getBox()){
if (b.selected){
result2 += "\n" + b.name+" "+b.distance+"€"+"q.tà :"+b.getQuantità();
int quantitaInt= Integer.parseInt(b.getQuantità());
totalAmount2+=b.distance * quantitaInt;
//a=String.valueOf(totalAmount);
}
}
/* for (Planet p : plAdapter.getBox()) {
if (p.selected){
result += "\n" + p.name+" "+p.distance+"€"+"q.tà :"+p.getQuantità();
int quantitaInt= Integer.parseInt(p.getQuantità() );
totalAmount+=p.distance * quantitaInt;
//a=String.valueOf(totalAmount);
}
}*/
//Toast.makeText(getActivity(), result + "\n" + "Total Amount:=" + totalAmount + "€", Toast.LENGTH_LONG).show();
Toast.makeText(getActivity(), result2 + "\n" + "Total Amount:=" + totalAmount2 + "€", Toast.LENGTH_LONG).show();
/*Bundle bun2 = new Bundle();
bun2.putString("scelta", result);
TwoFragment fgsearch2 = new TwoFragment();
fgsearch2.setArguments(bun2);
android.support.v4.app.FragmentTransaction transaction2 = getActivity().getSupportFragmentManager().beginTransaction();
transaction2.replace(R.id.content_main, fgsearch2);
transaction2.commit();
Bundle bun = new Bundle();
bun.putString("totale", a);
TwoFragment fgsearch = new TwoFragment();
fgsearch.setArguments(bun);
android.support.v4.app.FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.content_main2, fgsearch);
transaction.commit();
*/
}
}
答案 0 :(得分：0)
您想使用sqlite进行保存检查，或者您已经在使用sqlite数据库吗？
首先，当您返回检查页面时，要显示正确的检查项目，您需要将其临时存储在ArrayList中。 您也可以使用HashMap。
HashMap<Integer,boolean> checkMap = new HashMap<>();
现在进行检查时，只需将该值添加到地图中，就像这样
checkmap.put(position,true) or checkmap.put(position,false)// if unchecked.
您可以在MainActivity中将此checkmap设置为静态，当您返回检查页面时，只需检查hashmap值，如果为true，则在适配器中再次检查该项目。
if(checkMap.get(position)){
// check the check box
} else {
// else uncheck the box
}
现在，您将始终在hashmap中拥有已选中和未选中的值。 现在你必须遍历所有值并将它们存储在sqlite中。 对于sqlite，您可以使用以下库：http://satyan.github.io/sugar/
答案 1 :(得分：0)
您仍然可以使用共享偏好设置实现目标，但您需要正确映射key和value。我认为planetName在这里是独一无二的。因此，如果planetName是唯一的，则"Material_"+planetName将是唯一的，您可以使用它来保存和检索共享偏好设置中的数据：
变化：
Checked= settings.getBoolean("Material", false);
要：
Checked= settings.getBoolean("Material_"+holder.planetName.getText().toString(), false);
并修改您的点击监听器，如下所示：
holder.chkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (finalHolder.chkBox.isChecked()) {
finalHolder.edit.setVisibility(View.VISIBLE);
finalHolder.edit.setEnabled(true);
settings.edit().putBoolean("Material_"+finalHolder.planetName.getText().toString(), finalHolder.chkBox.isChecked()).commit();
System.out.println("presa");
} else {
finalHolder.edit.setVisibility(View.GONE);
finalHolder.edit.setEnabled(false);
finalHolder.edit.setText("");
settings.edit().putBoolean("Material_"+finalHolder.planetName.getText().toString(), finalHolder.chkBox.isChecked()).commit();
}
}
});