Android的，通过DialogFragment达到按钮？ [英] Android, reach Button via DialogFragment?

问题描述

我想要什么：按钮文本是08:00现在。当点击按钮，它显示了一个timepicker。选定的时间被设置为按钮的文本。 （报警的应用程序）。
我读一些有关此教程和问题，答案，但没有找到解答。之后，我preSS时钟按钮的应用程序崩溃。如果我把onCreateView参与评论它的作品。它说：android.util.AndroidRuntimeException：requestFeature（）必须在添加内容之前被称为

 公共类TimeSet扩展DialogFragment实现TimePickerDialog.OnTimeSetListener {    私人按钮时钟;    @覆盖
    公共对话框onCreateDialog（捆绑savedInstanceState）{
        //使用当前时间作为选择器的默认值
        最后的日历C = Calendar.getInstance（）;
        INT小时= c.get（Calendar.HOUR_OF_DAY）;
        INT分钟= c.get（Calendar.MINUTE）;        //创建TimePickerDialog的新实例，并将其返回
        返回新TimePickerDialog（getActivity（），这个，小时，分钟，
                DateFormat.is24HourFormat（getActivity（）））;
    }    @覆盖
    公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，
                         捆绑savedInstanceState）{        // R.layout.my_layout  - 这就是你的TextView放在布局
        查看查看= inflater.inflate（R.layout.listview_item_row，集装箱，FALSE）;
        时钟=（按钮）view.findViewById（R.id.ora）;
        //你可以使用你的TextView。
        返回视图。
    }    公共无效onTimeSet（TimePicker观点，诠释HOUROFDAY，分整型）{
        //做一些与用户所选择的时间
        clock.setText（新的StringBuilder（）追加（HOUROFDAY）.append（：。）追加（分钟））;
    }}
 

解决方案

从注释

 当点击它显示了一个timepicker按钮。用户选择时间和选择的时间表现为按钮文本（警报应用程序）。
 

有不需要膨胀的布局。

http://developer.android.com/guide/topics/ UI /控制/ pickers.html

使用一个接口作为回调到活动中。

在按钮单击显示的 DialogFragment 。使用界面。实现了相同的活动，时间设置按钮

 公共类TimePickerFragment扩展DialogFragment
实现TimePickerDialog.OnTimeSetListener {
    公共接口PickTime
    {
        公共无效返​​回时间（字符串值）;    }    PickTime mCallback;
@覆盖
公共对话框onCreateDialog（捆绑savedInstanceState）{
//使用当前时间作为选择器的默认值
    mCallback =（PickTime）getActivity（）;
最后的日历C = Calendar.getInstance（）;
INT小时= c.get（Calendar.HOUR_OF_DAY）;
INT分钟= c.get（Calendar.MINUTE）;//创建TimePickerDialog的新实例，并将其返回
返回新TimePickerDialog（getActivity（），这个，小时，分钟，
DateFormat.is24HourFormat（getActivity（）））;
}公共无效onTimeSet（TimePicker观点，诠释HOUROFDAY，分整型）{
//做一些与用户所选择的时间    如果（mCallback！= NULL）
    {
        StringBuilder的SB =新的StringBuilder（）;
        sb.append（HOUROFDAY）;
        sb.append（：）;
        sb.append（分钟）;
        mCallback.returnTime（sb.toString（））;
    }
}
}
 

在你的活动

 公共类MainActivity扩展ActionBarActivity实现PickTime {    Button按钮;
    TimePickerFragment newFragment;    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;
        按钮=（按钮）findViewById（R.id.button1）
        button.setOnClickListener（新OnClickListener（）{
            @覆盖
            公共无效的onClick（视图v）{
                  newFragment =新TimePickerFragment（）;
                  newFragment.show（getSupportFragmentManager（），timePicker）;               }
            }）;
    }
    @覆盖
    公共无效返​​回时间（字符串值）{
        // TODO自动生成方法存根
        button.setText（值）;    }}
 

What i want: the buttons text is "08:00" now. When click the button it shows a timepicker. The selected time is set to the buttons text. (Alarm app). i have read some tutorials and questions-answers about this, but haven't find the answers yet. After i press the clock button the app crashes. If i put the onCreateView part in comment it works. it says: android.util.AndroidRuntimeException: requestFeature() must be called before adding content.

public class TimeSet extends DialogFragment implements TimePickerDialog.OnTimeSetListener {

    private Button clock;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current time as the default values for the picker
        final Calendar c = Calendar.getInstance();
        int hour = c.get(Calendar.HOUR_OF_DAY);
        int minute = c.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) {

        // R.layout.my_layout - that's the layout where your textview is placed
        View view = inflater.inflate(R.layout.listview_item_row, container, false);
        clock = (Button)view.findViewById(R.id.ora);
        // you can use your textview.
        return view;
    }

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        // Do something with the time chosen by the user
        clock.setText(new StringBuilder().append(hourOfDay).append(":").append(minute));
    }

}

解决方案

From the comment

When clicks the button it shows a timepicker. The user select the time and the time chosen is showed as the buttons text (alarm app). 

There is no need to inflate a layout.

http://developer.android.com/guide/topics/ui/controls/pickers.html

Use a Interface as a call back to the activity.

On Button click show the DialogFragment. Use a interface. Implement the same in Activity and set the time to button

public class TimePickerFragment extends DialogFragment
implements TimePickerDialog.OnTimeSetListener {
    public interface PickTime
    {
        public void returnTime(String value);

    }

    PickTime mCallback;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current time as the default values for the picker
    mCallback = (PickTime) getActivity();
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.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

    if(mCallback!=null)
    {
        StringBuilder sb = new StringBuilder();
        sb.append(hourOfDay);
        sb.append(":");
        sb.append(minute);
        mCallback.returnTime(sb.toString());
    }
}
}

In your Activity

public class MainActivity extends ActionBarActivity implements PickTime{

    Button button;
    TimePickerFragment newFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.button1)
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                  newFragment = new TimePickerFragment();
                  newFragment.show(getSupportFragmentManager(), "timePicker");

               }
            });
    }
    @Override
    public void returnTime(String value) {
        // TODO Auto-generated method stub
        button.setText(value);

    }

}

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