Question

I have created a layout with a database call where a button will be created for each item inside the database. The buttons are created like I need and I also found out, how to set up the layout_width and layout_height but all buttons are placed in the same position and overlap each other so that only the last created button can be accessed. My code for creating the buttons looks like this:

Button bt = new Button(this);
bt.setText("Button Title");
bt.setLayoutParams(new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
linerLayout.addView(bt);

The activity looks like that, after generating the buttons:

I looked at each method that can be used for the button but didn’t find anything to define the position. I just thought about following method:

bt.layout(l, t, r, b);

but don’t know exactly how to use it and thought there might be a simpler method to solve this problem. Anybody who knows a workaround?!

---

CHANGED CODE

I just tryied to set the layout parameters like explained from "Chen doron". I have a relative layout inside my xml file:

<RelativeLayout
        android:id="@+id/llActOver"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="2" >        
</RelativeLayout>

and formatted the generated buttons like this:

Button bt = new Button(context);
bt.setText(c.getString(iDef));
fontClass.setFont(bt);
//RelativeLayout placeholder = new RelativeLayout(context);
RelativeLayout.LayoutParams  layoutParam = 
           new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,
                                           LayoutParams.WRAP_CONTENT);
if(rowCount < 1){
    layoutParam.addRule(RelativeLayout.ALIGN_PARENT_TOP);
    rowCount++;
}else{
    layoutParam.addRule(RelativeLayout.ALIGN_PARENT_TOP, lastButtonId);
}

lastButtonId = bt.getId();
//placeholder.addView(bt, layoutParam);
        
linearLayout.addView(bt, layoutParam);

I save the buttons id at the end of the loop so that the last buttons id can be accessed in the next round.
I also tryied to create a new relativ layout for each new button like the commented part of the code shows but even without the new layout nothing happens and i still just have all buttons overlapped.

Answer 1

I finally solved the problem, but just by trying each possible combination of layout types.
I found out, i have to define a LinearLayout inside the XML file and the attribute android:orientation=”vertical” is affordable. all the other parameters that have been set before were unimportant.

So now i have a LinearLayout inside a ScrollView in my xml file:

<ScrollView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="2" >

    <LinearLayout
        android:id="@+id/llActOver"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" 
        android:orientation="vertical">

    </LinearLayout>
</ScrollView>

and inside the java database i have following code to create a button for each row in the db, setting its Text and Font and add it to the loaded layout:

for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {

    Button bt = new Button(context);
    bt.setText(c.getString(iDef));
    fontClass.setFont(bt);
    linearLayout.addView(bt);
}

and here a screenshot of the result:

maybe somebody else who has the same problem won’t need to worry as long as me with this description.