Android 如何仅在选中复选框的情况下对文件进行写入和读取?
我有一个问题:如果我选中一个复选框,然后单击另一个选项卡,然后返回到上一个选项卡,那么现在选中之前的复选框不会被选中……因此我认为保存和读取文件时,只需选中复选框。 我使用了共享首选项,但它不起作用。。。。 所以,我的问题是: 如何仅在选中复选框的情况下对文件进行写入和读取 我希望你能帮助我! 提前谢谢大家 这是我的代码: 适配器:Android 如何仅在选中复选框的情况下对文件进行写入和读取?,android,android-studio,checkbox,Android,Android Studio,Checkbox,我有一个问题:如果我选中一个复选框,然后单击另一个选项卡,然后返回到上一个选项卡,那么现在选中之前的复选框不会被选中……因此我认为保存和读取文件时,只需选中复选框。 我使用了共享首选项,但它不起作用。。。。 所以,我的问题是: 如何仅在选中复选框的情况下对文件进行写入和读取 我希望你能帮助我! 提前谢谢大家 这是我的代码: 适配器: public abstract class PlanetAdapter extends ArrayAdapter<Planet> implements
public abstract class PlanetAdapter extends ArrayAdapter<Planet> implements CompoundButton.OnCheckedChangeListener
{
private List<Planet> planetList;
private Context context;
ArrayList<Birra> objects;
public PlanetAdapter(List<Planet> planetList, Context context) {
super(context, R.layout.single_listview_item, planetList);
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;
}
@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);
SharedPreferences settings = context.getSharedPreferences("data", Context.MODE_PRIVATE);
boolean Checked = settings.getBoolean("Material", false);
holder.chkBox.setChecked(Checked);
final PlanetHolder finalHolder = holder;
holder.chkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (finalHolder.chkBox.isChecked()) {
finalHolder.edit.setVisibility(View.VISIBLE);
finalHolder.edit.setEnabled(true);
SharedPreferences settings = context.getSharedPreferences("data", Context.MODE_PRIVATE);
settings.edit().putBoolean("Material", true).apply();
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());
}
});
} else {
finalHolder.edit.setVisibility(View.GONE);
finalHolder.edit.setEnabled(false);
finalHolder.edit.setText(null);
}
}
});
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;
}
}
公共抽象类PlanetAdapter扩展ArrayAdapter实现CompoundButton.OnCheckedChangeListener
{
私人名单;
私人语境;
阵列列表对象;
公共平面捕捉器(列表平面列表、上下文){
超级(上下文、右布局、单个列表视图、平面列表);
this.planetList=planetList;
this.context=上下文;
}
公共级刨床{
公共文本视图平面名称;
公共文本视图;
公共文本视图valuta;
公共复选框chkBox;
公共编辑文本编辑;
公共字符串量化;
}
@凌驾
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
视图行=转换视图;
刨刀夹持器=空;
if(行==null){
LayoutInflater充气器=((活动)上下文)。getLayoutInflater();
行=充气机。充气(R.layout.single\u listview\u项目,父项,false);
支架=新的刨床支架();
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=(复选框)row.findViewById(R.id.chk_框);
holder.edit=(EditText)row.findViewById(R.id.EditText);
holder.edit.setVisibility(View.GONE);
holder.edit.setEnabled(false);
row.setTag(支架);
}否则{
holder=(PlanetHolder)行。getTag();
}
最终行星p=行星列表get(位置);
SharedReferences设置=context.getSharedReferences(“数据”,context.MODE\u PRIVATE);
选中布尔值=设置。getBoolean(“材质”,false);
holder.chkBox.setChecked(已检查);
最终刨床最终刨床=保持架;
holder.chkBox.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
if(finalHolder.chkBox.isChecked()){
finalHolder.edit.setVisibility(View.VISIBLE);
finalHolder.edit.setEnabled(true);
SharedReferences设置=context.getSharedReferences(“数据”,context.MODE\u PRIVATE);
settings.edit().putBoolean(“Material”,true).apply();
finalHolder.edit.addTextChangedListener(新的TextWatcher(){
@凌驾
更改前文本之前的公共void(字符序列s、int start、int count、int after){
}
@凌驾
public void onTextChanged(字符序列、int start、int before、int count){
}
@凌驾
公共无效后文本已更改(可编辑){
p、 setQuantitá(finalHolder.edit.getText().toString().trim());
}
});
}否则{
finalHolder.edit.setVisibility(View.GONE);
finalHolder.edit.setEnabled(false);
finalHolder.edit.setText(null);
}
}
});
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);
返回行;
}
ArrayList getBox(){
ArrayList box=新的ArrayList();
用于(行星p:行星列表){
如果(p.selected)
框。添加(p);
}
返回框;
}
}
片段:
public class MyListFragment extends Fragment implements
android.widget.CompoundButton.OnCheckedChangeListener {
ListView lv;
ArrayList<Planet> planetList;
PlanetAdapter plAdapter;
BirraAdapter biAdapter;
PlanetAdapter.PlanetHolder holder;
//boolean mCheckBoxValue;
private CheckBox chkBox;
@Override
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);
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);
}
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();
*/
}
}
公共类MyListFragment扩展了片段实现
android.widget.CompoundButton.OnCheckedChangeListener{
ListView lv;
ArrayList planetList;
飞机适配器;
双适配器;
刨刀座;
//布尔值;
私有复选框chkBox;
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
//为该碎片膨胀布局
ViewGroup rootView=(ViewGroup)充气器。充气(R.layout.fragment_list2,容器,false);
Button mButton=(Button)rootView.findViewById(R.id.Button);
mButton.setOnClickListener(新视图.OnClickListener(){
公共void onClick(视图v){
展示结果(五);
}
});
//返回充气机。充气(R.layout.fragment_list2,容器,错误);
返回rootView;
}
@凌驾
已创建视图上的公共void(视图,@Nullable Bundle savedInstanceState){
super.onViewCreated(视图,savedInstanceState);
lv=(ListView)getView().findViewById(R.id.ListView);
displayPlanetList();
}
私有void displaytlist(){
planetList=新的ArrayList();
添加(新行星(“玛格丽塔”,6,“€”);
添加(新行星(“迪亚沃拉”,7,“€”);
添加(新行星(“Bufalina”,5,“€”);
添加(新行星(“Marinara”,5,“€”);
添加(新行星(“维也纳”,4“€”);
plAdapter=newplanetdapter(planetList,getContext()){
@凌驾
检查更改后的公共无效(复合按钮视图,布尔值已检查){
int pos=lv.getPositionForView(按钮视图);
if(isChecked(){
checked = true;
}else{
checked = false;}
saveInFile();
private void loadFile(){
FileInputStream fis = null;
ObjectInputStream ois = null;
if(this.isExternalStorageAvailable()) {
try {
fis = new FileInputStream(
new File(this.getExternalFilesDir("file"), "file.dat"));
ois = new ObjectInputStream(fis);
this.checked = (Boolean)ois.readObject();
} catch (FileNotFoundException e) {
//Toast.makeText(main, "File doesn't exist", Toast.LENGTH_SHORT).show();
} catch (StreamCorruptedException e) {
//Toast.makeText(main, "Error opening file", Toast.LENGTH_SHORT).show();
} catch(EOFException e){
try {
if(ois != null)
ois.close();
if(fis != null)
fis.close();
} catch (IOException e1) {
e1.printStackTrace();
}
} catch (IOException e) {
//Toast.makeText(main, "File read error", Toast.LENGTH_SHORT).show();
} catch (ClassNotFoundException e) {
//Toast.makeText(main, "Class Booelan doesn't exist", Toast.LENGTH_SHORT).show();
}
}
}
private void saveInFile(){
if(this.isExternalStorageAvailable()){
if(!this.isExternalStorageReadOnly()){
try {
FileOutputStream fos = new FileOutputStream(
new File(this.getExternalFilesDir("file"), "file.dat"));
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(checked);
oos.close();
fos.close();
} catch (FileNotFoundException e) {
//Toast.makeText(main, "Error opening File", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
//Toast.makeText(main, "Error saving File", Toast.LENGTH_SHORT).show();
}
}
}
}
private static boolean isExternalStorageAvailable(){
String estadoSD = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED.equals(estadoSD))
return true;
return false;
}
private static boolean isExternalStorageReadOnly(){
String estadoSD = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED_READ_ONLY.equals(estadoSD))
return true;
return false;
}
holder.chkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
p.setSelected(finalHolder.chkBox.isChecked()); //add this
if (finalHolder.chkBox.isChecked()) {
...
} else {
...
}
}
});
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState); // store value in key , value order
outState.putInt("curChoice", mCurCheckPosition);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (savedInstanceState != null) {
// Restore last state for checked position.
mCurCheckPosition = savedInstanceState.getInt("curChoice", 0);
}
}