ContextMenu没有出现

Question

我有这种方法：

void showAllSongsMenu() {
    if (rebuilding) {
        Toast.makeText(MusicPlayerActivity.this,
                "Database rebuild in progress, please wait!",
                Toast.LENGTH_SHORT).show();
        return;
    }
    LayoutInflater layoutInflater = (LayoutInflater) getBaseContext()
            .getSystemService(LAYOUT_INFLATER_SERVICE);
    final View popupView = layoutInflater.inflate(R.layout.allsongs_list,
            null);
    allSongs = new PopupWindow(popupView, LayoutParams.FILL_PARENT,
            LayoutParams.FILL_PARENT, true);
    Button allSongsMenu = (Button) allSongs.getContentView().findViewById(
            R.id.close_all_songs_menu);
    allSongs.setBackgroundDrawable(MusicPlayerActivity.this.getResources()
            .getDrawable(R.drawable.unknown_artist));
    allSongs.setFocusable(true);
    allSongsMenu.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            allSongs.dismiss();
        }

    });
    ListView lv = (ListView) allSongs.getContentView().findViewById(
            R.id.all_songs_list);
    //registerForContextMenu(lv);
    lv.setOnCreateContextMenuListener(new OnCreateContextMenuListener(){

        @Override
        public void onCreateContextMenu(ContextMenu menu, View v,
                ContextMenuInfo menuInfo) {
            menu.setHeaderTitle("Song options");
            menu.add(0, v.getId(), 0, "enqueue song");
            menu.add(0, v.getId(), 0, "song info");
            menu.add(0, v.getId(), 0, "cancel action");
        }});
    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            currentTrack = arg2;
            loadTrack();
            if (isTuning)
                if (track != null)
                    track.pause();
            isTuning = true;
            btnPlay.setBackgroundResource(R.drawable.pause);
            playTrack();
            allSongs.dismiss();
        }

    });
    base.getAllData();
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            R.layout.simple_row, base.getNames());
    lv.setAdapter(adapter);
    allSongs.showAtLocation(trackInfo, Gravity.CENTER, 0, -30);
}

没有显示ContextMenu。我还实现了onContextItemSelected，但由于未显示菜单，因此无法正常工作。每当我需要此PopupWindow时，都会调用此方法，并且它是作为选项之一从OptionsMenu调用的。我还尝试了在没有监听器的情况下为上下文菜单事件注册listview，但是它也不起作用。

Answer 1

我相信你必须为上下文菜单注册listview

registerForContextMenu(lv);

您评论了

编辑：

您还缺少用于打开上下文菜单的代码：

openContextMenu(view);

应该放在某个事件上，例如单击按钮

编辑2：

您实际上可以从另一个对话框片段开始一个dialogfragment，从而简化编码。示例如下：

活动代码：

public class MyActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Button button = new Button(this);
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                new Test1().show(getSupportFragmentManager(),"bla");
            }
        });
        setContentView(button);
    }

}

第一个对话框片段：

public class Test1 extends DialogFragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        Button button = new Button(getActivity());
        button.setText("test1");
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                new Test2().show(getActivity().getSupportFragmentManager(),"bla");
            }
        });
        return button;
    }

}

第二个对话框片段：

public class Test2 extends DialogFragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        Button button = new Button(getActivity());
        button.setText("test2");
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                dismiss();
            }
        });
        return button;
    }
}