我需要将数据从活动“ MainCalendar”传递到活动“添加”中的片段“ AddTaskFragment”。我在片段中有一个按钮，用于打开活动“ MainCalendar”，在其中选择日历中的日期，然后需要将此日期发送到片段中。
当我单击“选择按钮”时，将打开一个MainCalendar，用户需要选择日期，此后，活动关闭，然后我想将MainCalendar中的日期放在“ Choose Button”的文本中。 / p>
Add Activity with a fragment， MainCalendar活动：MainCalendar
MainCalendar.class：
public class MainCalendar extends AppCompatActivity {
private CalendarView Calendar;
private String date;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_calendar);
Calendar = (CalendarView) findViewById(R.id.calendarView);
Calendar.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
@Override
public void onSelectedDayChange(@NonNull CalendarView view, int year, int month, int dayOfMonth) {
date = (dayOfMonth+"/"+month+"/"+year);
System.out.println(date);
Intent intent = new Intent(MainCalendar.this, Add.class);
intent.putExtra("DATE_KEY", date);
finish();
}
});
}
添加类：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add);
BottomNavigationView bottomNav = findViewById(R.id.bottom_nav);
bottomNav.setSelectedItemId(R.id.add);
Button notes_button = findViewById(R.id.notes_btn);
Button tasks_button = findViewById(R.id.tasks_btn);
Button goals_button = findViewById(R.id.goals_btn);
RadioButton rb = findViewById(R.id.choose_day_btn);
String date = null;
Bundle extras = getIntent().getExtras();
if (extras != null) {
//The key argument here must match that used in the other activity
date = extras.getString("DATE_KEY");
}
AddTasksFragment frag = new AddTasksFragment();
Bundle bundle = new Bundle();
bundle.putString("DATE_KEY", date);
frag.setArguments(bundle);
Fragment fragment1 = new AddTasksFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,fragment1).commit();
bottomNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.notes:
startActivity(new Intent(getApplicationContext(), Notes.class));
overridePendingTransition(0,0);
return true;
case R.id.add:
return true;
case R.id.tasks:
startActivity(new Intent(getApplicationContext(), Tasks.class));
overridePendingTransition(0,0);
return true;
case R.id.goals:
startActivity(new Intent(getApplicationContext(), Goals.class));
overridePendingTransition(0,0);
return true;
case R.id.statistics:
startActivity(new Intent(getApplicationContext(), Statistics.class));
overridePendingTransition(0,0);
return true;
}
return false;
}
});
Fragment fragment = new AddTasksFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,fragment).commit();
tasks_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Fragment fragment = new AddTasksFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,fragment).commit();
}
});
notes_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Fragment fragment = new AddNotesFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,fragment).commit();
}
});
goals_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Fragment fragment = new AddGoalsFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,fragment).commit();
}
});
//
AddTaskFragment.class，位于Add.class中
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.add_tasks_fragment, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
subtask_btn = (Button) view.findViewById(R.id.add_subtask_btn);
subtask_name = (EditText) view.findViewById(R.id.subtask_name);
task_name = (EditText) view.findViewById(R.id.task_name);
lin_lay = (LinearLayout) view.findViewById(R.id.linear_layout);
sb_lay = (LinearLayout) view.findViewById(R.id.subtask_lay);
apply_btn = (Button) view.findViewById(R.id.apply_btn);
rgDay = (RadioGroup) view.findViewById(R.id.date_group);
rgPriority = (RadioGroup) view.findViewById(R.id.priority_group);
todayBtn = (RadioButton) view.findViewById(R.id.today_btn);
tomorrowBtn = (RadioButton) view.findViewById(R.id.tomorrow_btn);
chooseDayBtn = (RadioButton) view.findViewById(R.id.choose_day_btn);
lowPrBtn = (RadioButton) view.findViewById(R.id.low_btn);
mediumPrBtn = (RadioButton) view.findViewById(R.id.medium_btn);
highPrBtn = (RadioButton) view.findViewById(R.id.high_btn);
firebaseAuth = FirebaseAuth.getInstance();
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
dataBase = FirebaseDatabase.getInstance().getReference(TASKS_KEY);
this.getResources().getDisplayMetrics();
subtask_btn.setOnClickListener(this);
apply_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
writeTask();
}
});
chooseDayBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), MainCalendar.class);
startActivity(intent);
}
});
String data;
data = getActivity().getIntent().getStringExtra(DATE_KEY);
}
@Override
public void onClick(View v) {
addView();
}
private void writeTask() {
String Task;
Task = task_name.getText().toString();
dataBase.push().setValue(Task);
String[] subTasks = new String[sb_lay.getChildCount()];
for (int i = 0; i < sb_lay.getChildCount(); i++) {
View subtaskView = sb_lay.getChildAt(i);
EditText editTextName = (EditText) subtaskView.findViewById(R.id.subtask_name);
subTasks[i] = editTextName.getText().toString();
dataBase.child(Task).child("Subtasks").push().setValue(subTasks[i]);
}
dataBase.child(Task).push().setValue(getDay());
}
private String getDay(){
String day=null;
if(todayBtn.isChecked()){
Date currentTime = Calendar.getInstance().getTime();
day = currentTime.toString();
}
else if(tomorrowBtn.isChecked()){
Date dt = new Date();
Calendar c = Calendar.getInstance();
c.setTime(dt);
c.add(Calendar.DATE, 1);
dt = c.getTime();
day = dt.toString();
}else if(chooseDayBtn.isChecked()) {
day = getArguments().getString("DATE_KEY");
System.out.println(" Date is choosed ----------------------------------------------------------------------------" + day);
chooseDayBtn.setText(day);
}
return day;
}
private void addView(){
final View subtaskView = getLayoutInflater().inflate(R.layout.subtask_raw, null, false);
EditText editText = (EditText)subtaskView.findViewById(R.id.subtask_name);
ImageView imageClose = (ImageView)subtaskView.findViewById(R.id.remove_subtask);
imageClose.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
removeView(subtaskView);
}
});
sb_lay.addView(subtaskView);
String day;
day = getArguments().getString("DATE_KEY");
System.out.println(" Date is choosed " + day);
}
private void removeView(View view){
sb_lay.removeView(view);
}
答案 0 :(得分：0)
据我了解，您必须进行活动（Activity A和Activity B），并且活动B中有一个片段。您要做的是将活动A中的某些数据发送到该片段中原因。
首先让我们注意一下，如果不启动数据，就无法直接将数据发送到任何活动片段。因此，要将数据发送到片段，您必须首先将其从Activity A传递到Activity B，然后再将其从Activity B传递到Fragment第二步。
数据类型非常重要。如果要发送自定义类型（模型Java类），则必须将其定义为Parcelable，或者如果它是原始类型，例如int或float，则可以直接发送它
这是用Java实现的方法
ActivityA.java
class ActivityA extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activityA);
// define your data here
int data = 5;
// define an intent to send the data to the second activity
Intent intent = new Intent(getBaseContext(), SignoutActivity.class);
intent.putExtra("DATA_KEY", data);
startActivity(intent);
}
}
那么我们要做的是
Activity B class ActivityB extends Activity{
Int data;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activityB);
Bundle extras = getIntent().getExtras();
if (extras != null) {
//The key argument here must match that used in the other activity
data = extras.getInt("DATA_KEY");
}
// Fragment instance
FragmentClass frag = new FragmentClass();
Bundle bundle = new Bundle();
bundle.putInt("DATA_KEY", data );
frag.setArguments(bundle);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, mFeedFragment);
fragmentTransaction.commit();
}
}
，然后按照我们在Activity B