android项目--上下文菜单

一般说到上下文菜单基本上都是长按事件，在一个控件上长按，就会弹出一个菜单。

1.创建上下文菜单：

//覆盖方法，创建上下文菜单
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
      ContextMenuInfo menuInfo) {
     super.onCreateContextMenu(menu, v, menuInfo);
     //创建菜单项

　　  menu.add(0, 0, 0, "查看");
     menu.add(0, 1, 0, "跳转至网页查看");
     menu.add(0, 2, 0, "查看博主其他博文");

     menu.add(0, 0, 0, "删除此项");
     menu.add(0, 1, 0, "全部删除");
     menu.add(0, 2, 0, "返回");

 }

2.覆盖方法onContextItemSelected。对每一个菜单项进行相应的处理

    // 覆盖方法，对每一个菜单项进行事件监听
    @Override
    public boolean onContextItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case :
            Toast.makeText(context, "查看", Toast.LENGTH_SHORT).show();
            break;
        case :
            Toast.makeText(context, "跳转至网页查看", Toast.LENGTH_SHORT).show();
            break;
        case :
            // 。。。。。。。。
            break;
        default:
            break;
        }
        return super.onContextItemSelected(item);
    }

3.注册上下文菜单。如果没有注册，单击界面的某一个视图是没有反应的，所以上下文菜单与前面的选项菜单不一样

registerForContextMenu(linearLayout);   //注册上下文菜单

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在此，我想说的是另一种方法：通过对话框设置短按的上下文菜单

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AlertDialog.Builder dalog = new AlertDialog.Builder(OfflineBlogsContentActivity.this);
        dalog.setTitle("请选择您要的操作：");
        dalog.setView(null);
        dalog.setItems(new String[] { "跳转至网页查看", "查看博主其他博文", "删除此记录", "取消" },
                new OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog1, int which) {
                        switch (which) {
                        case ://跳转至网页查看
                            Intent intent = new Intent(OfflineBlogsContentActivity.this,
                                    BlogsContentActivity.class);
                            intent.setAction("showbloger");
                            intent.putExtra("id", blog_offine.getBlogId());
                            intent.putExtra("newstitle", blog_offine.getBlogTitle());
                            intent.putExtra("link", blog_offine.getBlogUrl());
                            intent.putExtra("summary", blog_offine.getBlogSummary());
                            intent.putExtra("updated", blog_offine.getUpdateTime());
                            intent.putExtra("comments", blog_offine.getBlogSummary());
                            intent.putExtra("name", blog_offine.getBloger());
                            if (CheckNetWork.checkNetworkInfo(OfflineBlogsContentActivity.this)) {
                                startActivity(intent);
                            }                        

                            break;

                        case ://查看博主其他博文
                            if (CheckNetWork.checkNetworkInfo(OfflineBlogsContentActivity.this)) {
                                System.out.println(blogapp);
                                Intent intent1 = new Intent(OfflineBlogsContentActivity.this,BlogerAllBlogsActivity.class);
                                intent1.putExtra("blogapp", blogapp);
                                intent1.putExtra("avatar", blogerimgUrl);
                                intent1.putExtra("name", blogername);
                                intent1.putExtra("postcount", blogernum);
                                startActivity(intent1);
                            }else{
                                Toast.makeText(OfflineBlogsContentActivity.this, "当前无网络！", Toast.LENGTH_SHORT).show();
                            }
                            break;
                        case ://删除此记录
                            AlertDialog.Builder alert = new AlertDialog.Builder(
                                    OfflineBlogsContentActivity.this);
                            alert.setView(null);
                            alert.setTitle("删除此项");
                            alert.setMessage("警告：将删除" + itemName);
                            alert.setPositiveButton("确定",
                                    new OnClickListener() {

                                        @Override
                                        public void onClick(
                                                DialogInterface dialog,
                                                int which) {
                                            BlogsSQLHelper
                                                    .getDBInstance(
                                                            OfflineBlogsContentActivity.this)
                                                    .deleteItem(
                                                            blog_offine
                                                                    .getBlogId());
                                        }
                                    });
                            alert.setNegativeButton("取消", null);
                            alert.create().show();
                            break;
                        case ://取消
                            dialog1.dismiss();
                            break;
                        }
                    }
                });
        dalog.create().show();