代码之家 › 专栏 › 技术社区 › anon

菜单按钮只能单击一次

android

anon · 技术社区 · 14 年前

我使用以下代码向菜单按钮添加了自定义菜单:

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        if (getDisplayedView() instanceof WorkspaceView) {
            ((WorkspaceView) getDisplayedView()).showEditMenu();
        }
        return true;
    }

和

public void showEditMenu() {
        new EditMenu(lexs, ((Project) projects.getSelectedItem()).getName(), ((ProjectList) projectsList.getSelectedItem()).getName()).show();
    }

editmenu的实现方式如下:

public class EditMenu {

    private final String DELETE_PROJECT = "Projekt lÃ¶schen";
    private final String DELETE_LIST = "Liste lÃ¶schen";
    private final String RENAME_PROJECT = "Projekt umbenennen";
    private final String RENAME_LIST = "Liste umbenennen";
    private final String CLOSE = "MenÃ¼ schliessen";

    private Context context;
    private String projectName;
    private String listName;
    private AlertDialog alert;

    private final CharSequence[] items = {DELETE_PROJECT, DELETE_LIST, RENAME_PROJECT, RENAME_LIST, CLOSE};

    public EditMenu(Context context, String projectName, String listName) {
        this.context = context;
        this.projectName = projectName;
        this.listName = listName;
    }

    public void show() {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setTitle(projectName + ": " + listName);
        builder.setItems(items, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int item) {
                if (items[item].equals(DELETE_PROJECT)) {
                    deleteProject();
                } else if (items[item].equals(DELETE_LIST)) {
                    deleteList();
                } else if (items[item].equals(RENAME_PROJECT)) {
                    renameProject();
                } else if (items[item].equals(RENAME_LIST)) {
                    renameList();
                } else if (items[item].equals(CLOSE)) {
                    close();
                }
            }
        });
        alert = builder.create();
        alert.show();
    }

    private void deleteProject() {

    }

    private void deleteList() {

    }

    private void renameProject() {

    }

    private void renameList() {

    }

    private void close() {

    }
}

如果我第一次单击菜单按钮,这就可以正常工作。但是如果上下文菜单关闭,我再次单击菜单按钮,则不会发生任何事情。

我也试着打电话

方法close()中的alert.close()、alert.hide()、alert.disclose()等,但不会改善情况。有什么暗示吗?谢谢!

1 回复 | 直到 14 年前

RoflcoptrException 14 年前

由于近3周内没有其他答案,我将自己回答我的问题:

而不是重写

public boolean onCreateOptionsMenu(Menu menu)

一个人必须超越

public boolean onPrepareOptionsMenu(Menu menu)

下面是一个简单的例子,如何做到这一点:

活动中有以下代码:

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        showMenu();
        return true;
}

private void showMenu() {
        EditMenu menu = new EditMenu(this, "Pacman Menu");
        menu.show();
}

然后,clsas editmenu以如下方式查找示例:

public class EditMenu {

    private final String QUIT = "Quit";
    private final String RESTART = "New Game";
    private final String SOUND = "Switch Sound";
    private final String PAUSE = "Un/pause";
    private final CharSequence[] items = new CharSequence[] {QUIT, RESTART, SOUND, PAUSE};

    private Context context;
    private String title;
    private AlertDialog alert;
    private MenuListener listener = new MenuListener();

    public EditMenu(Context context, String title) {
        this.context = context;
        this.title = title;
    }

    public void show() {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setIcon(R.drawable.splashscreen);
        builder.setTitle(title);
        builder.setItems(items, listener);
        alert = builder.create();
        alert.show();
    }

    private class MenuListener implements DialogInterface.OnClickListener {

        @Override
        public void onClick(DialogInterface dialog, int item) {
            if (items[item].equals(QUIT)) {
                ((PacmanGame) context).quitGame();
            } else if (items[item].equals(RESTART)) {
                ((PacmanGame) context).restart();
            } else if (items[item].equals(SOUND)) {
                Sound.setSoundOn(! Sound.isSoundOn());
            } else if (items[item].equals(PAUSE)) {
                ((PacmanGame) context).getGameBoard().setPausing(!(((PacmanGame) context).getGameBoard().isPaused()));
            }
        }

    }
}