实现DialogFragment方法

  1. 创建DialogPickerFragment类
  2. 创建AlertDialog
  3. 通过FragmentManager在屏幕上显示对话框

##　创建DialogFrgment

在屏幕上显示DialogFrgment时,托管Activity的FragmentManager会调用以下方法:

public Dialog onCreateDialog(Bundle savedInstanceState)

1.2.

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public class FragmentDataPicker extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new AlertDialog.Builder(getActivity())
                .setTitle(R.string.date_picker_title)
                .setPositiveButton(android.R.string.ok,null)
                .create();
    }
}

3.

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mDateButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentManager fm=getActivity()
                        .getSupportFragmentManager();

                FragmentDataPicker dialog=new FragmentDataPicker();
                dialog.show(fm,DIALOG_DATE);
            }
        });

android有三种用于对话框的按钮：positive按钮，negative按钮和neutral按钮。

设置对话框的显示内容

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View v=getActivity().getLayoutInflater()
                .inflate(R.layout.dialog_date,null);

return new AlertDialog.Builder(getActivity())
      .setView(v)
          .setTitle(R.string.date_picker_title)
          .setPositiveButton(android.R.string.ok,null)
          .create();