Question

第一次：我不需要有关如何创建和显示Dialog的课程，请阅读我写的所有内容。

我遇到了问题，这是我的第一个问题。我有一个带有主要活动的应用程序，左侧有一个抽屉，当我点击某个项目时，它会在主要内容中显示 Fragment 。 One Fragment让我在SQLite数据库中添加一个星球。然后另一个片段显示了一个列表，其中包含我在数据库中插入的行星。单击其中一个，将出现 FragmentDialog 并询问我是否要删除行星：如果是，请删除它，否则不执行任何操作。我认为，方法 onYes （）似乎没有被调用。有人知道为什么吗？这是 FragmentDialog 的类：

public class FragmentDialog extends DialogFragment 
{   
    private IFragmentDialog mListener;

    public static FragmentDialog getInstance()
    {
        return new FragmentDialog();
}

   public interface IFragmentDialog
    {
        public void onYes();
        public void onNo();
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) 
    {       
        AlertDialog.Builder vDialogBuilder = new AlertDialog.Builder(getActivity());
        vDialogBuilder.setTitle("Attenzione");
        vDialogBuilder.setMessage("Vuoi cancellare questo elemento?");
        vDialogBuilder.setPositiveButton("Sì", new DialogInterface.OnClickListener() 
        {
            @Override
            public void onClick(DialogInterface dialog, int which) 
            {
                if (mListener != null)
                {
                    mListener.onYes();
                }
            }
        });

        vDialogBuilder.setNegativeButton("No", new DialogInterface.OnClickListener() 
        {
            @Override
            public void onClick(DialogInterface dialog, int which) 
            {
                if (mListener != null)
                {
                    mListener.onNo();
                }
            }
        });

        return vDialogBuilder.create();
    }

    @Override
    public void onAttach(Activity activity) 
    {
        super.onAttach(activity);
        if (activity instanceof IFragmentDialog)
        {
            mListener = (IFragmentDialog) activity;
        }
    }
}

这是打开FragmentDialog的 Fragment 的 Class ：

public class FragmentPlanetList extends Fragment implements     LoaderManager.LoaderCallbacks<Cursor>, IFragmentDialog
{
    ListView mListView;
    PlanetCursorAdapter mCursorAdapter;
    private ILoadFragment mListener;

    public static Uri uri = null;

    private static final int PLANET_LOADER_ID = 0;

    public static FragmentPlanetList getInstance()
{
    return new FragmentPlanetList();
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
{
    View vView = inflater.inflate(R.layout.fragment_planet_list, container, false);
    getActivity().setTitle(R.string.fragment_planet_list);

    mListView = (ListView) vView.findViewById(R.id.planet_list);

    mCursorAdapter = new PlanetCursorAdapter(getActivity().getApplicationContext(), null, 0);

    mListView.setAdapter(mCursorAdapter);

    getLoaderManager().initLoader(PLANET_LOADER_ID, null, this);

    mListView.setOnItemClickListener(new OnItemClickListener()
    {
        @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
            {
            uri = Uri.parse(PlanetProvider.PLANETS_URI + "/" + id);

// getActivity（）。getContentResolver（）。delete（uri，null，null）; Toast.makeText（getActivity（），“Cancellato ID”+ id，Toast.LENGTH_SHORT）.show（）;

            showDialog();
        }
    });

    return vView;
}

protected void showDialog() 
{
    FragmentDialog vDialog = FragmentDialog.getInstance();
    vDialog.show(getFragmentManager(), "SHOW_DIALOG");
}

@Override
public void onAttach(Activity activity) 
{
    super.onAttach(activity);
    if (activity instanceof ILoadFragment)
    {
        mListener = (ILoadFragment) activity;
    }
}

    @Override
    public void onYes() 
    {
        // not called
        Toast.makeText(getActivity(), "A", Toast.LENGTH_LONG).show();

// getActivity（）。getContentResolver（）。delete（uri，null，null）; }

    @Override
    public void onNo() 
    {

    }
}

编辑：我认为问题是（如OrhanC1所述）if onAttach （）方法。我是否也在我的Activity中实现了FragmentDialog接口？如果是这样，我如何传递列表项的位置和要删除的URI？

Answer 1

创建DialogHanlder

public class DialogHandler {
    public Runnable ans_true = null;
    public Runnable ans_false = null;

    // Dialog. --------------------------------------------------------------

    public boolean Confirm(Activity act, String Title, String ConfirmText,
            String CancelBtn, String OkBtn, Runnable aProcedure, Runnable bProcedure) {
        ans_true = aProcedure;
        ans_false= bProcedure;
        AlertDialog dialog = new AlertDialog.Builder(act).create();
        dialog.setTitle(Title);
        dialog.setMessage(ConfirmText);
        dialog.setCancelable(false);
        dialog.setButton(DialogInterface.BUTTON_POSITIVE, OkBtn,
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int buttonId) {
                         ans_true.run();
                    }
                });
        dialog.setButton(DialogInterface.BUTTON_NEGATIVE, CancelBtn,
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int buttonId) {
                        ans_false.run();
                    }
                });
        dialog.setIcon(android.R.drawable.ic_dialog_alert);
        dialog.show();
        return true;
    }
}

将其称为另一个活动的方法

public class YourActivity extends Activity {
    /** Called when the activity is first created. */

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        findViewById(R.id.button1).setOnClickListener(myclick);
    }

    public final Button.OnClickListener myclick = new Button.OnClickListener() {
        @Override
        public void onClick(View v) {
            doclick();
        }
    };

    public void doclick() {
        DialogHandler appdialog = new DialogHandler();
        boolean dlg = appdialog.Confirm(this, "Message title", "Message content",
                "Cancel", "OK", aproc(), bproc());
    }

    public Runnable aproc(){
        return new Runnable() {
            public void run() {
                Log.d("Test", "This from A proc");
            }
          };
    }

    public Runnable bproc(){
        return new Runnable() {
            public void run() {
                Log.d("Test", "This from B proc");
            }
          };
    }


}

Answer 2

DialogFragment实际上只是一个包装对话框的片段。您可以通过在DialogFragment的onCreateDialog（）方法中创建和返回对话框来在其中放置任何类型的对话框。

使用onCreateDialog（）中的任意数量的按钮创建自定义对话框; 在给定的代码中，ok是禁用，您可以通过将代码复制为setNegativeButton Do来启用它。

用新的DialogInterface blah blah替换null。如果你喜欢

下面是一个示例DialogFragment：

class MyDialogFragment extends DialogFragment{
    Context mContext;
    public MyDialogFragment() {
        mContext = getActivity();
    }
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(mContext);
        alertDialogBuilder.setTitle("Really?");
        alertDialogBuilder.setMessage("Are you sure?");
        //null should be your on click listener
        alertDialogBuilder.setPositiveButton("OK", null);
        alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });


        return alertDialogBuilder.create();
    }
}

创建对话框调用：

new MyDialogFragment().show(getFragmentManager(), "MyDialog");

从某处解雇对话：

((MyDialogFragment)getFragmentManager().findFragmentByTag("MyDialog")).getDialog().dismiss();

所有这些代码都可以与支持库完美配合，只需更改导入即可使用支持库类。

附加到片段的片段对话框不会调用是/否方法

2 个答案: