Question

我做了一个简单的应用程序，它只会显示AlertDialog，列表中有四项。我注册了一个上下文菜单。当我长时间单击其中一个项目时，我会得到上下文菜单。然后，我从上下文菜单中选择一个项目，但onContextItemSelected从未被调用。有什么帮助吗？谢谢

test.java：

package com.cerulean.tech.creations.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;

public class test extends Activity {

    private String[] files;
    AlertDialog alert;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        files = new String[4];
    }

    public void selectScheme(View v) {
        files[0] = "<New Scheme>";
        files[1] = "test1";
        files[2] = "test2";
        files[3] = "test3";
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setItems(files, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int item) {
                   }});  
        alert = builder.create();
        alert.show();
        registerForContextMenu(alert.getListView());
    }


    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        menu.setHeaderTitle("Context Menu");
        menu.add(0, v.getId(), 0, "Delete");
        menu.add(0, v.getId(), 0, "Cancel");
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        return false;
    }
}

在main.xml中，我只是用android定义了一个按钮：onClick=“selectScheme”

Answer 1

此行之后：

    registerForContextMenu(alert.getListView());

键入以下内容：

    alert.getListView().setOnCreateContextMenuListener(this);

而不是onContextItemSelected（MenuItem项）函数，请使用以下内容：

@Override
public boolean onMenuItemSelected(int featureId, MenuItem menuItem) {

Answer 2

以下函数总是被执行。

 public boolean onMenuItemSelected(int featureId, MenuItem menuItem)

但是，您可以使用以下标志来区分上下文菜单和选项菜单：

if (featureId == Window.FEATURE_CONTEXT_MENU)
{
//Do something
}
else if (featureId == Window.FEATURE_OPTIONS_PANEL)
{
//Do something else
}

Answer 3

只需添加

@Override
public boolean onMenuItemSelected(int aFeatureId, MenuItem aMenuItem) {
    if (aFeatureId==Window.FEATURE_CONTEXT_MENU)
        return onContextItemSelected(aMenuItem);
    else
        return super.onMenuItemSelected(aFeatureId, aMenuItem);
}

Answer 4

我想在米奇的回答基础上再接再厉。

我只使用

registerForContextMenu(this.getListView());

和

this.getListView().setOnCreateContextMenuListener(this);

在我的父ListActivity类中。

我将代码从onContextItemSelected（MenuItem项）方法移动到了onMenuItemSelected。

  @Override
  public boolean onMenuItemSelected(int featureId, MenuItem item) {
    try {
      if (item.getItemId() == R.id.new_entry_menu_option) {

        ...

      }

      ...

      if (item.getItemId() == R.id.quit) {
        /* perform cleanup */
        ...
        return true;
      } else if (item.getItemId() == R.id.delete_entry_context_menu_option) {
        displayConfirmRequest(DELETE_CONFIRMATION_MESSAGE, item);
        return true;
      } else if (item.getItemId() == R.id.2ND_CONTEXT_OPTION) {
        //code for 2nd option
        return true;
      } else if (item.getItemId() == R.id.3RD_CONTEXT_OPTION) {
        //code for 3RD option
        return true;
      } else {
        return super.onMenuItemSelected(featureId, item);
      }// end if/else if/else
    }// end try
    catch (Exception error) {
      //error h和ler code
      return false;
    }// end try/catch
  }// end onMenuItemSelected

And make sure in your subclass, if you override onMenuItemSelected in the subclass of your super.ListActivity class, to include the following code if you want the contextmenu options to be h和led in the super.class.

@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
  if (<condition>) {

    ...

  } else {
    return super.onMenuItemSelected(featureId, item);
  }
}// end onMenuItemSelected

Answer 5

此问题的真正原因是您重写了onContextItemSelected，而没有调用super.onContextItemSelected。请将onContextItemSelect方法更改为：

@Override
public boolean onContextItemSelected(MenuItem item) {
    if (super.onContextItemSelected(MenuItem item))
        return true;
    return false;
}

友情链接