Android user interface with bitmaps problem

Question

I have a class Ball which extents View.Inside there i give some characteristics and implements onTouchEvent() so i can handle the movement.Also i use onDraw so i can draw the bitmap of the ball. in my activity class i crate a new Layout and i add the view to it so it can be displayed. Everything works fine except when, i try to add more balls to my layout they don't appear!Always the first added in layout ball is displayed! Here's the onCreate code from activity class:

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    LinearLayout ll = new LinearLayout(this);
    ll.setOrientation(LinearLayout.HORIZONTAL);
    int lHeight = LinearLayout.LayoutParams.WRAP_CONTENT;
    int lWidth = LinearLayout.LayoutParams.WRAP_CONTENT;

    Point point1 = new Point();
    point1.x = 50;
    point1.y = 20;
    Point point2 = new Point();
    point2.x = 100;
    point2.y = 20;
    Point point3 = new Point();
    point3.x = 150;
    point3.y = 20;

    ColorBall ball1 = new ColorBall(this,R.drawable.bol_groen, point1);
    ll.addView(ball1, new LinearLayout.LayoutParams(lHeight, lWidth));
    setContentView(ll);

    ColorBall ball2 = new ColorBall(this,R.drawable.bol_rood, point2);
    ll.addView(ball2, new LinearLayout.LayoutParams(lHeight, lWidth));
    setContentView(ll);

    ColorBall ball3 = new ColorBall(this,R.drawable.bol_blauw, point3);

    ll.addView(ball3, new LinearLayout.LayoutParams(lHeight, lWidth));
    setContentView(ll);        

}

What could possibly be the problem?I have try it also with only one setContentView() at the end.I am thinking that i can't use a Layout so i can draw bitmaps which are in a custom View!Am i right? Should i change my code and create a View and inside there make an array with all the balls i want to be displayed and then set this View to be displayed from my main class of activity?(like this setContentView(customview)).

Answer 1

You are calling setContentView several times, while it is expected to call only once per activity initialization.

UPDATE:

Could you use this layout xml instead of programmatic way you use? This is just to be 100% sure the container to which you will add the ColorBalls is Ok.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:id="@+id/container"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" />

Just in case, here is the code to include it in the activity:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.your_name_of_layout);

    LinearLayout container = (LinearLayout) findViewById(R.id.container);
    ..
    container.addView(ball1);
    container.addView(ball2);
    ..
}