当我在两个fragment之间传递参数时，字符串用户的值不在日志中打印...为什么？
这是我的代码：
ARRAY ADAPTER CLASS：
public abstract class PlanetAdapter extends ArrayAdapter<Planet> implements CompoundButton.OnCheckedChangeListener
{
private List<Planet> planetList;
private Context context ;
ArrayList<Birra> objects;
public boolean Checked;
private Integer[] imageId;
String ciao;
static PlanetAdapter plAdapter;
String selState ;
private FragmentManager fragmentManager;
/* public PlanetAdapter(Context context) {
super(context, R.layout.single_listview_item);
}
*/
/*public PlanetAdapter(FragmentManager fm,List<Planet> planetList, Context context,Integer[] imageId) {
super(context, R.layout.single_listview_item,planetList);
this.fm=fm;
this.planetList = planetList;
this.context = context;
this.imageId = imageId;
}
*/
public PlanetAdapter(List<Planet> planetList, Context context,Integer[] imageId) {
super(context, R.layout.single_listview_item,planetList);
this.planetList = planetList;
this.context = context;
this.imageId = imageId;
}
public FragmentManager getFragmentManager() {
return fragmentManager;
}
public class PlanetHolder {
public TextView planetName;
public TextView distView;
public TextView valuta;
public CheckBox chkBox;
public EditText edit;
public TextView caratteristica;
public boolean checked;
public TextView id;
public ImageView imageView;
public Spinner spinner;
}
@Override
public int getCount() {
return planetList.size();
}
@Override
public Planet getItem(int position) {
return planetList.get(position);
}
@Override
public View getView(final int position, final 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.spinner = (Spinner) row.findViewById(R.id.simpleSpinner);
holder.caratteristica=(TextView) row.findViewById(R.id.caratteristica);
holder.imageView = (ImageView) row.findViewById(R.id.ivImage);
holder.edit.setVisibility(View.GONE);
holder.edit.setEnabled(false);
holder.spinner.setVisibility(View.GONE);
// holder.id = (TextView) row.findViewById(R.id.id);
row.setTag(holder);
} else {
holder = (PlanetHolder) row.getTag();
}
final Planet p = planetList.get(position);
holder.imageView.setImageResource(imageId[position]);
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.caratteristica.setText(p.getCaratteristica());
holder.edit.setEnabled(false);
SharedPreferences states = getContext().getSharedPreferences("states", Context.MODE_PRIVATE);
boolean isChecked = states.getBoolean("holder.chkBox" + holder.planetName.getText().toString(), false);
System.out.println(isChecked);
if (isChecked) {
holder.chkBox.setChecked(true);
holder.edit.setVisibility(View.VISIBLE);
holder.edit.setEnabled(true);
holder.spinner.setVisibility(View.VISIBLE);
SharedPreferences statess = getContext().getSharedPreferences("states", Context.MODE_PRIVATE);
String string = statess.getString("finalHolder.edit" + holder.planetName.getText().toString(), holder.edit.getText().toString().trim());
holder.edit.setText(string);
} else {
holder.chkBox.setChecked(false);
holder.edit.setVisibility(View.GONE);
holder.edit.setEnabled(false);
holder.spinner.setVisibility(View.GONE);
}
holder.chkBox.setOnCheckedChangeListener(PlanetAdapter.this);
// final BirraHolder finalHolder = birraHolder;
final PlanetHolder finalHolder = holder;
holder.chkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
if (finalHolder.chkBox.isChecked()) {
finalHolder.edit.setVisibility(View.VISIBLE);
finalHolder.edit.setEnabled(true);
finalHolder.spinner.setVisibility(View.VISIBLE);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
getContext(),
R.array.country_arrays,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//finalHolder.spinner.setAdapter(adapter);
finalHolder.spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
finalHolder.spinner.setSelection(position);
selState = finalHolder.spinner.getSelectedItem().toString();
System.out.println(selState);
Toast.makeText(
getContext(),
"Clicked on Planet: " + selState + "", Toast.LENGTH_SHORT).show();
/*
Fragment fragment = new Fragment();
Bundle bundle = new Bundle();
bundle.putString("key", selState);
Log.i("BUNDLE", bundle.toString());
fragment.setArguments(bundle);*/
MyListFragment fragment = MyListFragment.newInstance("my_string");
FRAGMENT：
public class MyListFragment extends Fragment implements
CompoundButton.OnCheckedChangeListener{
ListView lv;
ArrayList<Planet> planetList;
static PlanetAdapter plAdapter;
private TextView txtName;
private TextView txtEmail;
private Button btnLogout;
ListView listView;
String user="";
private SQLiteHandler db;
private SessionManager session;
BirraAdapter biAdapter;
PlanetAdapter.PlanetHolder holder;
private static Context context = null;
private static FragmentActivity mInstance;
Integer[] imageId = {
R.mipmap.androtuto,
R.mipmap.ic_launcher,
R.mipmap.ic_launcher,
R.mipmap.ic_launcher,
R.mipmap.ok,
/*R.drawable.image6,
R.drawable.image7*/
};
public static MyListFragment newInstance(String tagName) {
MyListFragment fragment = new MyListFragment ();
Bundle args = new Bundle();
args.putString("key", tagName);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
user = getArguments().getString("key");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the custom_spinner_items for this fragment
//super.onDestroy();
SharedPreferences settings = getContext().getSharedPreferences("states", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.clear();
editor.commit();
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_list2, container, false);
/*Bundle bundle = this.getArguments();
String strtext = bundle.getString("key", " ");
System.out.println(strtext);*/
System.out.println("prima ancora");
Bundle arguments = this.getArguments();
System.out.println("prima");
if (arguments != null) {
System.out.println("dopo");
//String userId = arguments.getString("key");
//System.out.println("finalmente:"+userId);
user = getArguments().getString("Key");
} /*else {
Log.i("BUNDLE == null", "NULL");
}*/
System.out.println("finalmente:"+user);
Log.d("finalmente:", "" + user);
lv = (ListView) rootView.findViewById(R.id.listview);
ListAdapter listAdapter = new MyListAdapter(getContext());
lv.setAdapter(listAdapter);
context = getActivity();
mInstance = getActivity();
txtName = (TextView) rootView.findViewById(R.id.name);
txtEmail = (TextView) rootView.findViewById(R.id.numero_telefonico);
btnLogout = (Button) rootView.findViewById(R.id.btnLogout);
// SqLite database handler
db = new SQLiteHandler(context.getApplicationContext());
// session manager
session = new SessionManager(context.getApplicationContext());
/*
if (!session.isLoggedIn()) {
logoutUser();
}
*/
// Fetching user details from SQLite
HashMap<String, String> user = db.getUserDetails();
String name = user.get("name");
//String email = user.get("email");
// String email = user.get("email");
String email = user.get("numero_telefonico");
// Displaying the user details on the screen
System.out.println(name + email);
txtName.setText(name);
txtEmail.setText(email);
/* Button mButton = (Button) rootView.findViewById(R.id.button);
mButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showResult(v);
}
});*/
//return inflater.inflate(R.custom_spinner_items.fragment_list2, container, false);
btnLogout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
logoutUser();
}
});
return rootView;
}
private void logoutUser() {
session.setLogin(false);
db.deleteUsers();
// Launching the login activity
// Intent intent = new Intent(MyListFragment.this, LoginActivity.class);
Intent intent = new Intent(getActivity().getApplicationContext(), LoginActivity.class);
startActivity(intent);
mInstance.finish();
}
@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", "€","(pomodoro e mozzarella),"));
planetList.add(new Planet("Diavola", "7","€","(pomodoro,mozzarella e salsiccia piccante)"));
planetList.add(new Planet("Bufalina", "5","€","(pomodoro e mozzarella di bufala)"));
planetList.add(new Planet("Marinara", "5", "€","(pomodoro)"));
planetList.add(new Planet("Viennese", "4", "€", "(pomodoro,mozzarella e wrustel)"));
plAdapter = new PlanetAdapter(planetList, getContext(),imageId) {
@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();*//*
}*/
}
@TargetApi(Build.VERSION_CODES.KITKAT)
/*public String showResult(View v) throws IOException {
*//* //String result = "Selected Product are :";
String result = "";
// int totalAmount=0;
//String result2 = "";
//int totalAmount2=0;
//String a="";
//String z="";
for (Planet p : plAdapter.getBox()) {
if (p.isSelected()){
result += "\n" + p.getName()+" "+p.getDistance()+"€"+"q.tà :"+p.getQuantità();
}
}
//Toast.makeText(context, result + "\n" + "Total Amount:=" + totalAmount2 + "€", Toast.LENGTH_LONG).show();
return result;*//*
String result = "";
Gson json = new Gson();
for (Planet p : plAdapter.getBox()) {
if (p.isSelected()){
*//*json.put("name",p.getName());
json.put("distance",p.getDistance());
json.put("quantity",p.getQuantità());*//*
result=result+json.toJson(p);
}
}
//result=json.toString();
String path = Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/droidText/";
//FileWriter file=null;
*//* try {
file = new FileWriter(path+"filename5.json");
file.write(result);
}catch(IOException ie){}
finally{
file.flush();
file.close();
}*//*
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
String currentDate = sdf.format(new Date());
try(FileWriter file = new FileWriter(path + currentDate + " - " + ".json")) {
// file=new FileWriter(path+"filename100.json");
*//*FileWriter file = new FileWriter(path+"filename31.json");
file.write(result);
file.close();
*//*
json.toJson(result, file);
*//*catch(IOException r){
}*//*
}catch (IOException e){
}
System.out.println(result);
return result;
}*/
public static String showResultTotale2(View v,String user) {
int totalAmount=0;
String pizzeOrdinate="";
for (Planet p : plAdapter.getBox()) {
if (p.isSelected()){
pizzeOrdinate+="\n" + p.getName()+ " " + p.getDistance() + "€" + "q.tà :" + p.getQuantità()+ " " + user;
}
}
return pizzeOrdinate;
}
public static int showResultTotale(View v) {
int totalAmount=0;
for (Planet p : plAdapter.getBox()) {
if (p.isSelected()){
int quantitaInt= Integer.parseInt(p.getQuantità() );
int distanceInt= Integer.parseInt(p.getDistance());
totalAmount+=distanceInt * quantitaInt;
}
}
return totalAmount;
}
}
答案 0 :(得分：0)
尝试这样（在android studio中创建片段时，就这样做了）：
public class MyListFragment extends Fragment implements
CompoundButton.OnCheckedChangeListener{
ListView lv;
ArrayList<Planet> planetList;
static PlanetAdapter plAdapter;
private TextView txtName;
private TextView txtEmail;
private Button btnLogout;
ListView listView;
String user="";
private SQLiteHandler db;
private SessionManager session;
BirraAdapter biAdapter;
PlanetAdapter.PlanetHolder holder;
private static Context context = null;
private static FragmentActivity mInstance;
Integer[] imageId = {
R.mipmap.androtuto,
R.mipmap.ic_launcher,
R.mipmap.ic_launcher,
R.mipmap.ic_launcher,
R.mipmap.ok,
/*R.drawable.image6,
R.drawable.image7*/
};
public MyListFragment () { //Always put the empty constructor
}
public static MyListFragment newInstance(String tagName) {
MyListFragment fragment = new MyListFragment ();
Bundle args = new Bundle();
args.putString("key", tagName);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
user = getArguments().getString("key");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the custom_spinner_items for this fragment
//super.onDestroy();
SharedPreferences settings = getContext().getSharedPreferences("states", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.clear();
editor.commit();
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_list2, container, false);
/*Bundle bundle = this.getArguments();
String strtext = bundle.getString("key", " ");
System.out.println(strtext);*/
System.out.println("prima ancora");
Bundle arguments = this.getArguments();
System.out.println("prima");
System.out.println("finalmente:"+user);
Log.d("finalmente:", "" + user);
lv = (ListView) rootView.findViewById(R.id.listview);
ListAdapter listAdapter = new MyListAdapter(getContext());
lv.setAdapter(listAdapter);
context = getActivity();
mInstance = getActivity();
txtName = (TextView) rootView.findViewById(R.id.name);
txtEmail = (TextView) rootView.findViewById(R.id.numero_telefonico);
btnLogout = (Button) rootView.findViewById(R.id.btnLogout);
// SqLite database handler
db = new SQLiteHandler(context.getApplicationContext());
// session manager
session = new SessionManager(context.getApplicationContext());
/*
if (!session.isLoggedIn()) {
logoutUser();
}
*/
// Fetching user details from SQLite
HashMap<String, String> user = db.getUserDetails();
String name = user.get("name");
//String email = user.get("email");
// String email = user.get("email");
String email = user.get("numero_telefonico");
// Displaying the user details on the screen
System.out.println(name + email);
txtName.setText(name);
txtEmail.setText(email);
/* Button mButton = (Button) rootView.findViewById(R.id.button);
mButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showResult(v);
}
});*/
//return inflater.inflate(R.custom_spinner_items.fragment_list2, container, false);
btnLogout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
logoutUser();
}
});
return rootView;
}
private void logoutUser() {
session.setLogin(false);
db.deleteUsers();
// Launching the login activity
// Intent intent = new Intent(MyListFragment.this, LoginActivity.class);
Intent intent = new Intent(getActivity().getApplicationContext(), LoginActivity.class);
startActivity(intent);
mInstance.finish();
}
@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", "€","(pomodoro e mozzarella),"));
planetList.add(new Planet("Diavola", "7","€","(pomodoro,mozzarella e salsiccia piccante)"));
planetList.add(new Planet("Bufalina", "5","€","(pomodoro e mozzarella di bufala)"));
planetList.add(new Planet("Marinara", "5", "€","(pomodoro)"));
planetList.add(new Planet("Viennese", "4", "€", "(pomodoro,mozzarella e wrustel)"));
plAdapter = new PlanetAdapter(planetList, getContext(),imageId) {
@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();*//*
}*/
}
@TargetApi(Build.VERSION_CODES.KITKAT)
/*public String showResult(View v) throws IOException {
*//* //String result = "Selected Product are :";
String result = "";
// int totalAmount=0;
//String result2 = "";
//int totalAmount2=0;
//String a="";
//String z="";
for (Planet p : plAdapter.getBox()) {
if (p.isSelected()){
result += "\n" + p.getName()+" "+p.getDistance()+"€"+"q.tà :"+p.getQuantità();
}
}
//Toast.makeText(context, result + "\n" + "Total Amount:=" + totalAmount2 + "€", Toast.LENGTH_LONG).show();
return result;*//*
String result = "";
Gson json = new Gson();
for (Planet p : plAdapter.getBox()) {
if (p.isSelected()){
*//*json.put("name",p.getName());
json.put("distance",p.getDistance());
json.put("quantity",p.getQuantità());*//*
result=result+json.toJson(p);
}
}
//result=json.toString();
String path = Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/droidText/";
//FileWriter file=null;
*//* try {
file = new FileWriter(path+"filename5.json");
file.write(result);
}catch(IOException ie){}
finally{
file.flush();
file.close();
}*//*
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
String currentDate = sdf.format(new Date());
try(FileWriter file = new FileWriter(path + currentDate + " - " + ".json")) {
// file=new FileWriter(path+"filename100.json");
*//*FileWriter file = new FileWriter(path+"filename31.json");
file.write(result);
file.close();
*//*
json.toJson(result, file);
*//*catch(IOException r){
}*//*
}catch (IOException e){
}
System.out.println(result);
return result;
}*/
public static String showResultTotale2(View v,String user) {
int totalAmount=0;
String pizzeOrdinate="";
for (Planet p : plAdapter.getBox()) {
if (p.isSelected()){
pizzeOrdinate+="\n" + p.getName()+ " " + p.getDistance() + "€" + "q.tà :" + p.getQuantità()+ " " + user;
}
}
return pizzeOrdinate;
}
public static int showResultTotale(View v) {
int totalAmount=0;
for (Planet p : plAdapter.getBox()) {
if (p.isSelected()){
int quantitaInt= Integer.parseInt(p.getQuantità() );
int distanceInt= Integer.parseInt(p.getDistance());
totalAmount+=distanceInt * quantitaInt;
}
}
return totalAmount;
}
}
更简单：
public class MyListFragment extends Fragment {
public MyListFragment () { //Always put the empty constructor
}
public static MyListFragment newInstance(String tagName) {
MyListFragment fragment = new MyListFragment ();
Bundle args = new Bundle();
args.putString("key", tagName);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
user = arguments.getString("key");
}
}
}
您正在创建片段而不是：
MyListFragment fragment = new MyListFragment();
final Bundle bundle = new Bundle();
bundle.putString("key", selState);
Log.i("BUNDLE", bundle.toString());
fragment.setArguments(bundle);
使用此：
MyListFragment fragment = MyListFragment.newInstance("my_string");
问题真的不清楚...... 在adpater中：
private MyListFragment fragment;
public PlanetAdapter(List<Planet> planetList, Context context,Integer[] imageId, MyListFragment myFragment) {
super(context, R.layout.single_listview_item,planetList);
this.planetList = planetList;
this.context = context;
this.imageId = imageId;
this.fragment = myFragment;
}
当您需要时：
fragment.passValue("my string");
现在在你的片段中创建方法：
public void passValue(String myString){
//Do whatever with myString
}
答案 1 :(得分：0)
这是因为你在错误的地方调用了getArguments（）。
覆盖onCreate（）并输入代码以获取其中的值。
@Override
public void onCreate(Bundle savedInstanceState) {
Bundle arguments = getArguments();
if (arguments != null) {
//String userId = arguments.getString("key");
//System.out.println("finalmente:"+userId);
user = arguments.getString("key");
} /*else {
Log.i("BUNDLE == null", "NULL");
}*/
//System.out.println("finalmente:"+user);
Log.e("MESSAGE","finalmente:"+user);
}
答案 2 :(得分：0)
System.out.println("finalmente:"+user);在Android中无效。
您必须使用Log.d("MESSAGE","MY MESSAGE");
Bundle arguments = getArguments();
if (arguments != null) {
//String userId = arguments.getString("key");
//System.out.println("finalmente:"+userId);
user = arguments.getString("key");
} /*else {
Log.i("BUNDLE == null", "NULL");
}*/
Log.d("finalmente:",""+user);
}
答案 3 :(得分：0)
启动片段时，您正尝试使用getArguments（）。最好在onViewCreated触发器
时尝试处理你的Arguments@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
handleArguments(getArguments());
}
public void handleArguments(Bundle bnd) {
if (bnd != null) {
if (bnd.containsKey("key")) {
user = arguments.getString("key");
}
}
System.out.println("finalmente:"+user);
}