从数据库中删除项目后，在片段中显示小吃栏

Question

我正在寻找一种方法，当用户使用caseR.id.delete:从数据库中删除项目时，在显示屏底部弹出一个零食盒。下面我附加了片段中的代码。如果您需要更多来自不同领域的代码，请告诉我。

/**
 * A simple {@link Fragment} subclass.
 */
public class MainActivityListFragment extends ListFragment {
    private ArrayList<Note> notes;
    private NoteAdapter noteAdapter;
    @Override
    public void onActivityCreated(Bundle savedInstanceState){
        super.onActivityCreated(savedInstanceState);
        /*
        String[] values = new String[] {"Android", "iPhone", "Windows", "WebOS", "Android", "iPhone", "Windows", "WebOS" };
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, values);
        setListAdapter(adapter);
        */
        NotesDbAdapter dbAdapter = new NotesDbAdapter(getActivity().getBaseContext());
        dbAdapter.open();
        notes = dbAdapter.getAllNotes();
        dbAdapter.close();
        noteAdapter = new NoteAdapter(getActivity(), notes);
        setListAdapter(noteAdapter);
        getListView().setDivider(null);
        getListView().setDividerHeight(0);
        registerForContextMenu(getListView());

    }
    @Override
    public void onListItemClick(ListView l, View v, int position, long id){
        super.onListItemClick(l, v, position, id);
        launchNoteDetailActivity(MainActivity.FragmentToLaunch.VIEW, position);
    }
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo){
        super.onCreateContextMenu(menu, v, menuInfo);
        MenuInflater menuInflater = getActivity().getMenuInflater();
        menuInflater.inflate(R.menu.long_press_menu, menu);
    }
    @Override
    public boolean onContextItemSelected(MenuItem item){
        AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
        int rowPosition = info.position;
        Note note = (Note) getListAdapter().getItem(rowPosition);
        switch (item.getItemId()){
            case R.id.edit:
                launchNoteDetailActivity(MainActivity.FragmentToLaunch.EDIT, rowPosition);
                Log.d("menu clicks", "we pressed edit");
                return true;
            case R.id.delete:
                NotesDbAdapter dbAdapter = new NotesDbAdapter(getActivity().getBaseContext());
                dbAdapter.open();
                dbAdapter.deleteNote(note.getId());
                notes.clear();
                notes.addAll(dbAdapter.getAllNotes());
                noteAdapter.notifyDataSetChanged();
                dbAdapter.close();
        }
        return super.onContextItemSelected(item);
    }
    private void launchNoteDetailActivity(MainActivity.FragmentToLaunch ftl, int position){
        Note note = (Note) getListAdapter().getItem(position);
        Intent intent = new Intent(getActivity(), NoteDetailActivity.class);
        intent.putExtra(MainActivity.NOTE_TITLE_EXTRA, note.getTitle());
        intent.putExtra(MainActivity.NOTE_MESSAGE_EXTRA, note.getMessage());
        intent.putExtra(MainActivity.NOTE_CATEGORY_EXTRA, note.getCategory());
        intent.putExtra(MainActivity.NOTE_DATE_EXTRA, note.getDate());
        intent.putExtra(MainActivity.NOTE_ID_EXTRA, note.getId());
        switch(ftl){
            case VIEW:
                intent.putExtra(MainActivity.NOTE_FRAGMENT_TO_LOAD_EXTRA, MainActivity.FragmentToLaunch.VIEW);
                break;
            case EDIT:
                intent.putExtra(MainActivity.NOTE_FRAGMENT_TO_LOAD_EXTRA, MainActivity.FragmentToLaunch.EDIT);
        }
        startActivity(intent);
    }
}

Answer 1

在你的build.gradle中添加最新的设计库。

compile 'com.android.support:design:X.X.X' // where X.X.X version

然后，在您的片段中执行以下操作：

Snackbar  
    .make(view, "Item deleted",Snackbar.LENGTH_SHORT)
    .show();

参数view可以是片段的根布局。你只需要它的参考。

有关详细信息，请参阅 http://www.materialdoc.com/snackbar/

Answer 2

1. 添加设计库

      Compile 'com.android.support:design:X.X.X'
   

2. 法典：

      case R.id.delete:
           NotesDbAdapter dbAdapter = new NotesDbAdapter(getActivity().getBaseContext());
           dbAdapter.open();
           dbAdapter.deleteNote(note.getId());
           notes.clear();
           notes.addAll(dbAdapter.getAllNotes());
           noteAdapter.notifyDataSetChanged();
           dbAdapter.close();
           // Show SNACK Bar
           mRoot = (RelativeLayout) view.findViewById(R.id.mainrl);
           Snackbar snackbar = Snackbar.make(mRoot , "Item Deleted", Snackbar.LENGTH_LONG);
           snackbar.show();
   

这里 mRoot 是片段的主要根布局。