在 Dialogfragment 中显示 DatePickerDialog

Question

我创建了一个 DialogFragment，它有一个 EditText，当用户按下 EditText 时，有一个新的 DatePickerDialog，它假设从用户，然后在 DialogFragment 中设置它。我很难做到：

DatePickerDialog 实际上出现了，但破坏了旧的 DialogFragment。当我点击 ok/whatever 我 return 到 activity.
我想将我选择的日期传回片段。如果我想将它传回 activity 会更容易，因为我可以使用 getActivity() 方法。那么如何将我选择的日期传递回调用选择器的片段？

主要片段

public class NewWorkoutItemFragment extends android.app.DialogFragment implements
    View.OnClickListener {

private String mDate;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_new_workout_item, container, false);

    //A lot of code

    return view;
}

@Override
public void onClick(View v) {
switch (v.getId()){
    case R.id.NewWorkout_date_et:
        //Call to DatePickerDialog
        DialogFragment pickDate = new DatePickerFragment();
        pickDate.show(getFragmentManager(), "show");
}

public void setmDate(String mDate) {
    this.mDate = mDate;
}
}

DatePickerFragment

public class DatePickerFragment extends android.app.DialogFragment implements DatePickerDialog.OnDateSetListener {

@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    // Use the current date as the default date in the picker.
    final Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);

    // Create a new instance of DatePickerDialog and return it.
    return new DatePickerDialog(getActivity(), this, year, month, day);
}

@Override
public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
String dateString = Integer.toString(dayOfMonth) +
                "/" + Integer.toString(month+1) +
                "/" + Integer.toString(year);
    //note- Return dateString back to NewWorkoutItemFragment, using setmDate
}
}

Answer 1

您应该为 datepicker 或 timepicker 对话框使用 'com.wdullaer:materialdatetimepicker:2.3.0' 库。
首先在app level gradle file中添加依赖。之后用 NewWorkoutItemFragment extends DialogFragment 创建一个新的 java 文件。

public class NewWorkoutItemFragment extends DialogFragment implements 
DatePickerDialog.OnDateSetListener {

@OnClick(R.id.layout_time)
public void onClickTime(View view){
    calendar= Calendar.getInstance();


        datePickerDialog= TimePickerDialog.newInstance(NewWorkoutItemFragment.this,
                calendar.get(Calendar.YEAR), // Initial year selection
                calendar.get(Calendar.MONTH), // Initial month selection
                calendar.get(Calendar.DAY_OF_MONTH) // Inital day selection
                false);

    datePickerDialog.setThemeDark(false);
    datePickerDialog.setAccentColor(Color.parseColor("#58a5f0"));
    datePickerDialog.setTitle("Select Date");
    datePickerDialog.show(getFragmentManager(),"DatePicker Dialog");

}

public NewWorkoutItemFragment() {
}

public static NewWorkoutItemFragment newInstance (String title) {
    NewWorkoutItemFragment frag = new NewWorkoutItemFragment();
    Bundle args = new Bundle();
    args.putString("title", title);
    frag.setArguments(args);
    return frag;
}

@Override
public void onAttach(final Context context) {
    super.onAttach(context);
}

@Override
public void onDetach() {
    super.onDetach();
}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    final Dialog dialog = super.onCreateDialog(savedInstanceState);

    final Window window = dialog.getWindow();
    if (window != null) {
        window.requestFeature(Window.FEATURE_NO_TITLE);
        window.setBackgroundDrawableResource(android.R.color.transparent);

        WindowManager.LayoutParams windowLayoutParams = window.getAttributes();
        windowLayoutParams.dimAmount = DIM_AMOUNT;
    }
    dialog.setCancelable(false);
    dialog.setCanceledOnTouchOutside(false);
    return dialog;
}


@Nullable
@Override
public View onCreateView(final LayoutInflater inflater,
                         final ViewGroup container,
                         final Bundle savedInstanceState) {
    final View view = inflater.inflate(R.layout.dlg_network, container, false);
    return view;
}

@Override
public void onResume() {
    super.onResume();
    final int width = getScreenWidth();
    changeWindowSizes(width, ViewGroup.LayoutParams.WRAP_CONTENT);
}

public static int getScreenWidth() {
    return Resources.getSystem().getDisplayMetrics().widthPixels;
}

private void changeWindowSizes(int width, int height) {
    final Window window = getDialog().getWindow();
    if (window != null) {
        // hack to change window width
        window.setLayout(width, height);
    }
}

@Override
public void onDestroyView() {
    super.onDestroyView();
    mUnbinder.unbind();
}

@Override
public int getTheme() {
    return R.style.CustomDialog;
}

@Override
public void onDateSet(DatePickerDialog view, int year, int monthOfYear, int dayOfMonth) {
 String date = "You picked the following date: "+dayOfMonth+"/"+(monthOfYear+1)+"/"+year;
 dateTextView.setText(date);
}


}

和你想打开的classNewWorkoutItemFragment只需要让这个对话框的对象class像

newWorkDialog= new NewWorkoutItemFragment();
NewWorkoutItemFragment newWorkDialog;
newWorkDialog= NewWorkoutItemFragment.newInstance("T");
newWorkDialog.show(manager,"Show");

在样式文件中只需添加以下行

<style name="CustomDialog" parent="Theme.AppCompat.Light.Dialog">
    <item name="android:windowAnimationStyle">@style/CustomDialogAnimation</item>
</style>

<style name="CustomDialogAnimation">
    <item name="android:windowEnterAnimation">@anim/translate_left_side</item>
    <item name="android:windowExitAnimation">@anim/translate_right_side</item>
</style>

并在 res 中创建一个新包并将其命名为 anim 并在 anim 文件夹中创建两个文件 transition_left_side 和 transition_right_side.

transition_left_side

代码

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="600"
android:fromXDelta="100%"
android:toXDelta="0%"/>

和 transition_right_side

的代码

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:fromXDelta="0%" android:toXDelta="100%"
android:fromYDelta="0%" android:toYDelta="0%"
android:duration="600"/>

我想这不会造成任何进一步的错误。

Answer 2

解决方案根本与 datepickerdialog 无关。我的片段中有一个 switch-case 来管理点击事件。我不小心忘记在导致流向其他事件（其中一个是 dismiss();）的案例之后放一个 break;，这就是为什么 datepickerdialog 也忽略了我的片段。

在 Dialogfragment 中显示 DatePickerDialog

showing a DatePickerDialog inside a Dialogfragment

android

android-dialogfragment