从片段加载 timePickerDialog

Question

我正在尝试使用自定义时间选择器，然后运行来自片段的选择器。这是时间选择器对话框的代码 (TimePickerFragment.java):

package com.ravit.android.aroundtheclock;

import android.app.Dialog;
import android.app.DialogFragment;
import android.app.Fragment;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TimePicker;

import java.util.Calendar;

/**
 * A simple {@link Fragment} subclass.
 */
public class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener {


    public TimePickerFragment() {
        // Required empty public constructor
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current time as the default values for the picker

        final Calendar calendar = Calendar.getInstance();
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);

        // Create a new instance of TimePickerDialog and return it
        return new TimePickerDialog(getActivity(), this, hour, minute,
                DateFormat.is24HourFormat(getActivity()));
    }

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

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        // Do something with the time chosen by the user
    }
}

这是来自显示时间选择器的 onCreateView 片段的代码 (WorkdayFragment.java)：

mButtonEnd = (Button)v.findViewById(R.id.end_workday);
mButtonEnd.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        TimePickerFragment dialog = new TimePickerFragment();
        dialog.show(getActivity().getFragmentManager(), DIALOG_TIME);
    }
});

这是我在按下按钮时遇到的错误。加载视图似乎有问题：

10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime: FATAL EXCEPTION: main
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime: Process: com.ravit.android.aroundtheclock, PID: 20325
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at com.android.internal.policy.PhoneWindow.requestFeature(PhoneWindow.java:317)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at com.android.internal.app.AlertController.installContent(AlertController.java:231)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.AlertDialog.onCreate(AlertDialog.java:423)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.Dialog.dispatchOnCreate(Dialog.java:394)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.Dialog.show(Dialog.java:295)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.DialogFragment.onStart(DialogFragment.java:499)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.Fragment.performStart(Fragment.java:2244)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1002)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1148)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.BackStackRecord.run(BackStackRecord.java:793)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1535)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.FragmentManagerImpl.run(FragmentManager.java:482)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.os.Handler.handleCallback(Handler.java:739)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:95)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:148)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5417)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
10-25 16:24:46.696 20325-20325/com.ravit.android.aroundtheclock E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我的猜测是时间选择器代码的编写方式有问题，因为当我用日期选择器替换它时，所有运行都没有错误。

我尝试根据有关此主题的其他答案解决 requestFeature() 错误，但没有任何进展。

关于如何从这里继续的任何建议都将非常有帮助。谢谢！

Answer 1

您好，首先您需要删除时间选择器片段的 onCreateView。我也可以在示例中找到与我分享。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {...}

所以你的 TimerPickerFragment 应该如下所示

package com.ravit.android.aroundtheclock;

import android.app.Dialog;
import android.app.DialogFragment;
import android.app.Fragment;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TimePicker;

import java.util.Calendar;

/**
 * A simple {@link Fragment} subclass.
 */
public class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener {


    public TimePickerFragment() {
        // Required empty public constructor
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current time as the default values for the picker

        final Calendar calendar = Calendar.getInstance();
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);

        // Create a new instance of TimePickerDialog and return it
        return new TimePickerDialog(getActivity(), this, hour, minute,
                DateFormat.is24HourFormat(getActivity()));
    }

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        // Do something with the time chosen by the user
    }
}

Caution: If your app supports versions of Android lower than 3.0, be sure that you call getSupportFragmentManager() to acquire an instance of FragmentManager. Also make sure that your activity that displays the time picker extends FragmentActivity instead of the standard Activity class.

mButtonEnd = (Button)v.findViewById(R.id.end_workday);
mButtonEnd.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        DialogFragment newFragment  = new TimePickerFragment();
        //newFragment.show(getActivity().getFragmentManager(), DIALOG_TIME);
        newFragment.show(getSupportFragmentManager(), DIALOG_TIME);
        // if you are using the nested fragment then user the 
        //newFragment.show(getChildFragmentManager(), DIALOG_TIME);
    }
});

如果您有任何问题，请告诉我。谢谢

Answer 2

这是一个完整的例子，可以从 Fragment 和 Activity:

public class TimePickerDialogFragment extends DialogFragment {

    private static final String ARGUMENT_HOUR = "ARGUMENT_HOUR";
    private static final String ARGUMENT_MINUTE = "ARGUMENT_MINUTE";
    private static final String ARGUMENT_IS_24_HOURS = "ARGUMENT_IS_24_HOURS";
    private TimePickerDialog.OnTimeSetListener listener;

    private int hourOfDay;
    private int minute;
    private boolean is24Hours;

    public static TimePickerDialogFragment newInstance(final int hour, final int minute, final boolean is24Hours) {
        final TimePickerDialogFragment df = new TimePickerDialogFragment();
        final Bundle args = new Bundle();
        args.putInt(ARGUMENT_HOUR, hour);
        args.putInt(ARGUMENT_MINUTE, minute);
        args.putBoolean(ARGUMENT_IS_24_HOURS, is24Hours);
        df.setArguments(args);
        return df;
    }

    @Override
    public void onCreate(@Nullable final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        retrieveArguments();
    }

    private void retrieveArguments() {
        final Bundle args = getArguments();
        if (args != null) {
            hourOfDay = args.getInt(ARGUMENT_HOUR);
            minute = args.getInt(ARGUMENT_MINUTE);
            is24Hours = args.getBoolean(ARGUMENT_IS_24_HOURS);
        }
    }

    @Override
    public Dialog onCreateDialog(final Bundle savedInstanceState) {
        return new TimePickerDialog(getContext(), this.listener, this.hourOfDay, this.minute, this.is24Hours);
    }

    public void setListener(final TimePickerDialog.OnTimeSetListener listener) {
        this.listener = listener;
    }
}

初始化并显示：

final Calendar c = Calendar.getInstance();
final boolean is24Hours = DateFormat.is24HourFormat(getContext());
final TimePickerDialogFragment timePicker = TimePickerDialogFragment.newInstance(
        c.get(Calendar.HOUR_OF_DAY),
        c.get(Calendar.MINUTE),
        is24Hours);
timePicker.setListener(this);
timePicker.showNow(getChildFragmentManager(), null);

从片段加载 timePickerDialog

Loading timePickerDialog from a fragment

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