GridView Android 中的上下文菜单

Question

我有GridView：

GridView gridView = (GridView) findViewById(R.id.grid_view);
// Instance of ImageAdapter Class
final String [] imageNames = {"knee_kg","knee_ks","knee_kp","knee_kg_90", 
                              "pipe_knee", "cover", "funnel", "crater"};
Integer[] mThumbIds = new Integer[imageNames.length];
for (int i = 0; i<imageNames.length; i++){
    Integer resID = getResources().getIdentifier(imageNames[i], "drawable", 
                                                 getPackageName());
    mThumbIds[i] = resID;
}

和OnItemCliclListener：

gridView.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int pos, long arg3) {
        Class clazz = null;
        String className = imageNameToUpper(imageNames[position]);
        try {
            clazz = Class.forName("com.example.pipecalculator.activities." + className);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Intent intentClass = new Intent(getApplicationContext(), clazz);
        startActivity(intentClass);
    }
});

我只想在单击两个项目时创建上下文菜单："knee_ks"、"knee_kp"。另一方面是：

Intent intentClass = new Intent(getApplicationContext(), clazz);
startActivity(intentClass);

有可能？

Answer 1

这是可能的。
您应该使用int position：

gridView.setOnItemClickListener(new OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
                    if (position == 0 || position == 2 /*and other, or just: position < 5*/)
                    { 
                       //Code for positio 0 and 2
                    }
                    else
                    {
                       //Code for othe positions
                    }
                }   
            });

使用此示例显示上下文菜单。

Answer 2

首先注册网格视图以获取上下文菜单

 registerForContextMenu(grid);

，然后覆盖函数

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
        ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    getMenuInflater().inflate(R.menu.context_menu, menu);
    GridView gv = (GridView) v;
    AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
    int position = info.position;
            if(!(position==0 || position==2))
             {
             menu.close();
             )
}

上下文菜单侦听器

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

Answer 3

这似乎是一个古老的话题，但我遇到了同样的问题，想放弃对我有用的东西。基于@Abhishek命题，我所做的只是用menu.clear()代替menu.close()语句，瞧！上下文仅出现在位置 0 和 2 上。

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
        ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    getMenuInflater().inflate(R.menu.context_menu, menu);
    AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
    int position = info.position;
            if(!(position==0 || position==2)){
                   menu.clear();
             }
}