java - 暂停直到函数完成运行

Question

我正在尝试编写一个在 Google map 上标记特定标记的应用。当在 map 上长按一个点时，会弹出一个对话框，用户可以在其中输入有关该点的信息。然后，此信息将显示在标记的信息窗口中。

对于我编写的代码，当长按一个点时，showEditDialog() 运行并出现对话框，但应用程序不会等待用户输入信息并按 OK，然后运行其余代码在 map 上长按。这意味着新添加的点没有此信息，因为应用程序会在保存数据之前尝试从 SharedPreferences 加载数据，但是当应用程序重新启动并重新加载所有标记时，该信息就会出现。我该如何解决这个问题？

主要 Activity :

mMap.setOnMapLongClickListener(new OnMapLongClickListener() {

        @Override
        public void onMapLongClick(LatLng point) {

            sharedPreferences = getSharedPreferences("location", 0);
            int locationCount = sharedPreferences.getInt("locationCount", 0);

            showEditDialog();

            locationCount++;

            String name = sharedPreferences.getString("name"+Integer.toString(locationCount-1), null);
            String url = sharedPreferences.getString("url"+Integer.toString(locationCount-1), null);
            // Drawing marker on the map
            mMap.addMarker(new MarkerOptions()  
                .position(point)
                .title(name)
                .snippet(url)
            );

            /** Opening the editor object to write data to sharedPreferences */
            SharedPreferences.Editor editor = sharedPreferences.edit();

            // Storing the latitude for the i-th location
            editor.putString("lat"+ Integer.toString((locationCount-1)), Double.toString(point.latitude));

            // Storing the longitude for the i-th location
            editor.putString("lng"+ Integer.toString((locationCount-1)), Double.toString(point.longitude));

            // Storing the count of locations or marker count
            editor.putInt("locationCount", locationCount);

            /** Saving the values stored in the shared preferences */
            editor.commit();

            Toast.makeText(getBaseContext(), "New Camera Added!", Toast.LENGTH_SHORT).show();

        }
    });
}

private void showEditDialog() {
    FragmentManager fm = getSupportFragmentManager();
    AddCamDialog addCamDialog = new AddCamDialog();
    addCamDialog.show(fm, "fragment_newcam");
}


@Override
public void onFinishEditDialog1(String EditText1) {
    sharedPreferences = getSharedPreferences("location", 0);
    int locationCount = sharedPreferences.getInt("locationCount", 0);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putString("name"+ Integer.toString((locationCount-1)), EditText1);
    editor.commit();
}

@Override
public void onFinishEditDialog2(String EditText2) {
    sharedPreferences = getSharedPreferences("location", 0);
    int locationCount = sharedPreferences.getInt("locationCount", 0);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putString("url"+ Integer.toString((locationCount-1)), EditText2);
    editor.commit();
}

对话框类:

public class AddCamDialog extends DialogFragment {

    public interface AddCamDialogListener {
        void onFinishEditDialog1(String EditText1);
        void onFinishEditDialog2(String EditText2);
    }


    private EditText EditText1;
    private EditText EditText2;

    public AddCamDialog() {
        // Empty constructor required for DialogFragment
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle(R.string.title_NewCamera);

        View view = getActivity().getLayoutInflater().inflate(R.layout.fragment_newcam, null);
        EditText1 = (EditText) view.findViewById(R.id.cam_name);
        EditText2 = (EditText) view.findViewById(R.id.cam_URL);

        builder.setView(view);

        builder.setPositiveButton(R.string.PositiveButton, new DialogInterface.OnClickListener() {
            //@Override
            public void onClick(DialogInterface dialog, int which) {
                AddCamDialogListener activity = (AddCamDialogListener) getActivity();
                activity.onFinishEditDialog1(EditText1.getText().toString());
                activity.onFinishEditDialog2(EditText2.getText().toString());

                dialog.cancel();
            }
        });

        builder.setNegativeButton(R.string.NegativeButton, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        return builder.create();

    }
}

Answer 1

由于这些操作是异步的，您应该根据适当的事件触发每个阶段，在本例中是对话框的结束，因此将仅在对话框关闭后才应执行的代码放在 onFinishEditDialog1 中/onFinishEditDialog2，不是在调用 showEditDialog

之后