如何通过活动类将参数传递给android中的类扩展视图

Question

I have a class which extends Activity.

I also have a layout for that activity which includes a videoview and progressbar .

There is another class which extends View and creates rectangles on top of the progress bar in the activity layout.

I want both the main layout and the rectangles created by view class to be visible in the same screen.

I need to pass parameters to the view class to set the positions of the rectangle.

As far as I know, you cannot set 2 content types from an activity class.

So I ended up calling the view class from my layout like this:

  <com.example.user.CanvasHeat
    android:id="@+id/viewCanvas"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"/>

But, this way I cannot pass parameters to the CanvasHeat class.

And if I create the CanvasHeat class from the Activity Class then I cannot set the main layout and the rectangles simultaneously.

How should I display both the layout and the rectangles in the same screen and also pass parameters to the view class?

Thanks

Answer 1

The only way I see is to declare some methods in your view class to set properties after it was inflated in Activity. Like this:

class CanvasHeat extends View {
    public void setValue(int value){ ... }
}

Then in your Activity:

View viewCanvas = findViewById(R.id.viewCanvas);
viewCanvas.setValue(42);