如何在充气视图上显示上下文菜单？

Question

I want to display contextmenu for an inflated view. Here is the code sample:

for grid_layout.xml:

<?xml version="1.0" encoding="utf-8"?>    
    <ImageView
            xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scaleType="centerInside"
        android:antialias="true" />

Now I am using it in my activiy class as:

  @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {       
            menu.setHeaderTitle("Select action");       
            menu.add(0, 1, 0, "Action1");
            menu.add(0, 2, 0, "Action2");

            super.onCreateContextMenu(menu, v, menuInfo);
    }

    LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    ImageView imageView = (ImageView) inflater.inflate(R.layout.grid_layout, null);
    imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               registerForContextMenu(v);
                       openContextMenu(v);
            }

        });

This code runs without any error but the context menu does not show up when I click the imageView. Is there anything wrong with this code?

Answer 1

I have found a workaround for this situation and solved my problem. As I told that the same code works fine and displays the ContextMenu, if I define the ImageView in the XML which I set in setContentView() method. I simply used the object of that imageView to register the contextMenu and displayed the ContextMenu on click of inflated item. Here is the sample code:

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {       
            menu.setHeaderTitle("Select action");       
            menu.add(0, 1, 0, "Action1");
            menu.add(0, 2, 0, "Action2");

            super.onCreateContextMenu(menu, v, menuInfo);
    }

    ImageView imageViewInContext = (ImageView) findViewById(R.id.imageview_in_main_xml);
    registerForContextMenu(imageViewInContext);

    LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    ImageView imageView = (ImageView) inflater.inflate(R.layout.grid_layout, null);
    imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {                   
                 openContextMenu(imageViewInContext);
            }

        });

Hope this will help someone!

Answer 2

Add in your code:

imageView.setFocusable(true);
imageView.setClickable(true);

after that Imageview will get clickEvent.

Answer 3

Because you are creating an Anonymous Inner Class (by doing new View.OnClickListener ) you are no longer operating in the UI thread (your Activity class), so the context menu does not load when you want to registerForContextMenu and openContextMenu . You can either use a Handler to send a message to the UI thread(your Activity class) to perform these actions, or try to reference your Activity class in your inner class. Something like this:

activityClassName.this.registerForContextMenu(v);
activityClassName.this.openContextMenu(v);