Question

In my program I have a custom view object. Inside the view class is a method called foo. For some reason when I call foo from my activity, it doesn’t fire. Here is the code:

XML of the custom view:

<com.company.application.MyView
    android:id="@+id/my_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

The activity code:

public class Main extends Activity {

    MyView mView;

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

        LayoutInflater li = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View v = li.inflate(R.layout.main, null);   
        mView= (MyView) v.findViewById(R.id.my_view);

        //A button to fire the method inside foo()
        Button switchLeft = (Button) findViewById(R.id.switch_left);
        switchLeft.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                callTest();
            }
        });
    }

    public void callTest() {
        Log.w(this.getClass().getName(), "clicked left arrow");
        mView.foo();
        mView.postInvalidate();

    }
}

Finally here is foo:

public void foo() {
    mBackground = mContext.getResources().getDrawable(R.drawable.temp_canvas);
    Log.w(this.getClass().getName(), "background set");
}

The first log is always written when the button is pressed, but the second log is not because foo never fires. What is the deal here?

Thanks in advance all.

Edit: upon request, the full view

public class MyView extends View {

    Drawable mBackground;

    Context mContext;

    public MyView (Context context) {
        super(context);
        mContext = context;
        mBackground = mContext.getResources().getDrawable(R.drawable.leftarrow1);
    }

    public MyView (Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        mBackground = mContext.getResources().getDrawable(R.drawable.leftarrow1);
    }

    public void foo() {
        mBackground = mContext.getResources().getDrawable(R.drawable.temp_canvas);
        Log.w(this.getClass().getName(), "background set");
    }

    @Override
    public void onDraw(Canvas canvas) {
        Paint paint = new Paint();
        paint.setStyle(Paint.Style.FILL);

        // draw a solid blue circle
        paint.setColor(Color.BLUE);
        canvas.drawCircle(20, 20, 15, paint);

        // draw a test background
        mBackground.setBounds(0, 0, 300, 400);
        mBackground.draw(canvas);
    }
}

Answer 1

After restarting the emulator, foo() is now getting called, it just doesn’t set the background properly…but that is another problem.