如何显示上下文菜单网格布局中的Android

Question

所以我做了一个类扩展BaseAdaper，看起来像这样：

public class ProfileTileAdapter extends BaseAdapter { 

private Context context; 
private ForwardingProfile[] profiles; 

public ProfileTileAdapter(Context context, ForwardingProfile[] profiles) { 
    this.context = context; 
    this.profiles = profiles; 
} 

@Override 
public int getCount() { 
    return profiles.length; 
} 

@Override 
public Object getItem(int position) { 
    return profiles[position]; 
} 

@Override 
public long getItemId(int position) { 
    return profiles[position].getID(); 
} 

@Override 
public View getView(int position, View convertView, ViewGroup arg2) { 
    ProfileTile tile = null; 
    if (convertView == null) { 
     tile = new ProfileTile(context, profiles[position]); 
     LayoutParams lp = new GridView.LayoutParams(
       LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); 
     tile.setLayoutParams(lp); 
    } else { 
     tile = (ProfileTile) convertView; 
    } 
    return tile; 
} 

}

在我的活动有一个网格布局和它的适配器设置为ProfileTileAdapter的实例。在我的活动中，我想打开一个上下文菜单，当用户长按其中一个视图（在这种情况下是一个ProfileTile），但我不知道如何。当用户在上下文菜单中选择一个选项时，我还需要找出ProfileTile长时间按下的内容。所有的教程都在活动中使用静态视图进行操作，但不是这样。

Answer 1

所以我最终找出答案。很显然，当你使用Activity.registerForContextMenu(GridView)注册一个GridView到你的Activity中的上下文菜单时，它会独立地注册你从适配器返回的每个视图。因此，这是该活动的样子（适配器保持不变）：

public class SMSForwarderActivity extends Activity { 
private GridView profilesGridView; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    this.setContentView(R.layout.main); 
    setUpProfilesGrid(); 
} 

    private void setUpProfilesGrid() { 
    profilesGridView = (GridView) this.findViewById(R.id.profilesGrid); 
    this.registerForContextMenu(profilesGridView); 
} 

@Override 
public void onCreateContextMenu(ContextMenu menu, View v, 
     ContextMenuInfo menuInfo) { 
    super.onCreateContextMenu(menu, v, menuInfo); 
    AdapterContextMenuInfo aMenuInfo = (AdapterContextMenuInfo) menuInfo; 
    ProfileTile tile = (ProfileTile) aMenuInfo.targetView;//This is how I get a grip on the view that got long pressed. 
} 

    @Override 
public boolean onContextItemSelected(MenuItem item) { 
    AdapterContextMenuInfo info = (AdapterContextMenuInfo) item 
      .getMenuInfo(); 
    ProfileTile tile = (ProfileTile) info.targetView;//Here we get a grip again of the view that opened the Context Menu 
    return super.onContextItemSelected(item); 
} 

}

因此，解决办法是相当简单的，但有时我们在复杂的事情。