Android ContextMenu for View (Not Activity)

问题

I am using the following method to add a ContextMenu to a custom view i have built but i want to know how to react to the press of that contextmenu.

This is not an Activity so i cannot do this:

  @override
  public boolean onOptionsItemSelected(MenuItem item) {

Here is the code

 private View.OnCreateContextMenuListener vC = new View.OnCreateContextMenuListener() {

    @Override
    public void onCreateContextMenu(ContextMenu arg0, View arg1,
            ContextMenuInfo arg2) {
        // TODO Auto-generated method stub
        arg0.add(0, 0, 0, "Call");
        arg0.add(0, 1, 0, "Map");
        arg0.add(0, 2, 0, "Market");


    }


};

Update:

Here is a very simplified verion of my class.

 public final class NewView extends View {



 public NewView(Context context, AttributeSet attrs) {
    super(context, attrs);
    cntxt = context;
    this.setLongClickable(true);
    this.setOnLongClickListener(vLong);
    this.setOnCreateContextMenuListener(vC);


 }

private View.OnLongClickListener vLong = new View.OnLongClickListener() {
    public boolean onLongClick(View view) {
        showContextMenu();
             return true;   
    }
 };  
 private View.OnCreateContextMenuListener vC = new View.OnCreateContextMenuListener() {

    @Override
    public void onCreateContextMenu(ContextMenu arg0, View arg1,
            ContextMenuInfo arg2) {
        // TODO Auto-generated method stub
        arg0.add(0, 0, 0, "Call");
        arg0.add(0, 1, 0, "Map");
        arg0.add(0, 2, 0, "Market");


    }

};


  } 

回答1:

Use item.getItemId() and create switch and cases based on the number returned by getItemId()

Something like this.

 @override
  public boolean onOptionsItemSelected(MenuItem item) {

      switch(item.getItemId())
      {
         case 1:
               Log.i("FIRST ITEM: ", "CALL");
               break;
         case 2: 
                Log.i("2nd ITEM: ", "MAP");
                break;
          case 3:
               Log.i("3rd ITEM: ", "Market");
               break;
         default:
      }
}

I hope this is what you meant by reacting on menu items selection. :)

回答2:

Noone seem to answer exhaustively TS' question (and mine eventually), thus let me post a solution to this. Given the code above you can attach custom MenuItem's click handlers:

private View.OnCreateContextMenuListener vC = new View.OnCreateContextMenuListener() {

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {

        menu.add(0, 0, 0, "Call")
                .setOnMenuItemClickListener(mMenuItemClickListener);
        menu.add(0, 1, 0, "Map")
                .setOnMenuItemClickListener(mMenuItemClickListener);
        menu.add(0, 2, 0, "Market")
                .setOnMenuItemClickListener(mMenuItemClickListener);

    }
};  

private OnMenuItemClickListener mMenuItemClickListener = new OnMenuItemClickListener() {

        @Override
        public boolean onMenuItemClick(MenuItem item) {

            switch (item.getItemId()) {
            case 0:
                // do "Call"
                return true;

            case 1:
                // do "Map"
                return true;

            case 2:
                // do "Market"
                return true;
            }

            return false;
        }
    };
};

回答3:

This does seem to be an odd inconsistency in Android - a View can create a context menu, but the handling of said menu can only happen in completely different code?

I'm also solving this with setOnMenuItemClickListener(). The documentation suggests this is reasonable, but it requires effort to set it up if you are using a MenuInflater.

    public void onCreateContextMenu(final ContextMenu menu, final View v,
            final ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        final MenuInflater menuInflater = this.menuInflater;
        menuInflater.inflate(R.menu.context_date, menu);

        final int length = menu.size();
        for (int index = 0; index < length; index++) {
            final MenuItem menuItem = menu.getItem(index);
            menuItem.setOnMenuItemClickListener(this);
        }
    }

回答4:

In the view :
Let your view implements ContextMenuInfo

public class MyView extends View implements ContextMenuInfo

Then, override getContextMenuInfo to return your view.

@Override
protected ContextMenuInfo getContextMenuInfo() {
    return  this ;
}

In you activity :
Register your view for ContextMenu.

registerForContextMenu(myView);

Then access the view in your activity onContextItemSelected.

    public boolean onContextItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        ...
        case R.id.action_ctx_wordview_read_tts:
             MyView myView = (MyView) item.getMenuInfo();
        ...
    }
}

Note :
When I add an onClickListener to the MyView, the contextMenu stoped working. I had to add the following code to solve the problem.

  tvWord.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            return false;
        }
    });

回答5:

You could assign a variable to your View from your activity after you inflate the main layout (in `onCreate).

myView = (View) findViewById(R.id.my_view);

Next, do registerForContextMenu(myView);

Finally, you can override onCreateContextMenu where you can add what happens when the context menu appears.

来源：https://stackoverflow.com/questions/7043388/android-contextmenu-for-view-not-activity