[英]How to pass data from Activity A to fragment in Activity B?
我需要將數據從活動“MainCalendar”傳遞到活動“Add”中的片段“AddTaskFragment”。 我在一個片段中有一個按鈕,它打開一個活動“MainCalendar”,我在日歷中選擇一個日期,然后我需要將此日期發送到一個片段中。
當我單擊“選擇按鈕”時,會打開一個 MainCalendar,用戶需要在其中選擇日期,然后活動關閉,然后我想將 MainCalendar 中的日期添加到“選擇按鈕”的文本中。
添加帶有片段的活動,MainCalendar 活動: 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.class:
@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,它在 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);
}
據我了解,您必須進行活動( Activity A
和Activity B
)並且您在活動 B 中有一個片段。您想要做的是出於任何原因將一些數據從活動 A 發送到該片段。
讓我們先說明一下,您不能在不啟動活動的情況下直接將數據發送到活動的任何片段。 因此,為了將此數據發送到片段,您必須首先將其從Activity A
傳遞到Activity B
,然后作為第二步將其從Activity B
發送到Fragment
。
數據類型非常重要。 如果您要發送自定義類型(模型 java 類),則必須將其定義為Parcelable或者如果它是原始類型(例如int
或float
,則您可以直接發送它
這是如何在Java中做到這一點
活動A.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);
}
}
那么我們需要做的是
Activity B
的數據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();
}
}
然后按照我們在Activity B
接收它的方式接收它
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