How to create a RelativeLayout programmatically with two buttons one on top of the other

Question

I m adding two buttons to the UI  but they appear on top of one another  I want them to appear next to each other  What am I missing in this code   m btnCrown   new ImageButton this   m btnCrown setImageResource R drawable king crown thumb   m btnCrown setAlpha 100    RelativeLayout LayoutParams lp   new RelativeLayout LayoutParams      RelativeLayout LayoutParams WRAP CONTENT  RelativeLayout LayoutParams WRAP CONTENT   lp addRule RelativeLayout ALIGN PARENT TOP     addContentView m btnCrown  lp     m btnMonkey   new ImageButton this   m btnMonkey setImageResource R drawable monkey small   m btnMonkey setAlpha 100    lp   new RelativeLayout LayoutParams      RelativeLayout LayoutParams WRAP CONTENT  RelativeLayout LayoutParams WRAP CONTENT   lp addRule RelativeLayout ALIGN PARENT TOP   lp addRule RelativeLayout RIGHT OF  m btnCrown getId         addContentView m btnMonkey  lp

User · Answer

I have written a quick example to demonstrate how to create a layout programmatically.

public class CodeLayout extends Activity {

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

        // Creating a new RelativeLayout
        RelativeLayout relativeLayout = new RelativeLayout(this);

        // Defining the RelativeLayout layout parameters.
        // In this case I want to fill its parent
        RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.FILL_PARENT,
                RelativeLayout.LayoutParams.FILL_PARENT);

        // Creating a new TextView
        TextView tv = new TextView(this);
        tv.setText("Test");

        // Defining the layout parameters of the TextView
        RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);
        lp.addRule(RelativeLayout.CENTER_IN_PARENT);

        // Setting the parameters on the TextView
        tv.setLayoutParams(lp);

        // Adding the TextView to the RelativeLayout as a child
        relativeLayout.addView(tv);

        // Setting the RelativeLayout as our content view
        setContentView(relativeLayout, rlp);
    }
}

In theory everything should be clear as it is commented. If you don't understand something just tell me.

User · Answer

Found the answer in How to lay out Views in RelativeLayout programmatically   We should explicitly set id s using setId    Only then  RIGHT OF rules make sense   Another mistake I did is  reusing the layoutparams object between the controls  We should create new object for each control

User · Answer

public class AndroidWalkthroughApp1 extends Activity implements View OnClickListener        final int TOP ID   3      final int BOTTOM ID   4           Called when the activity is first created          Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main               create two layouts to hold buttons         RelativeLayout top   new RelativeLayout this           top setId TOP ID           RelativeLayout bottom   new RelativeLayout this           bottom setId BOTTOM ID               create buttons in a loop         for  int i   0  i  lt  2  i                  Button button   new Button this               button setText  Button     i                  R id won t be generated for us  so we need to create one             button setId i                   add our event handler  less memory than an anonymous inner class              button setOnClickListener this                   add generated button to view             if  i    0                    top addView button                             else                   bottom addView button                                    RelativeLayout root    RelativeLayout  findViewById R id root layout               add generated layouts to root layout view           LinearLayout root    LinearLayout this findViewById R id root layout            root addView top           root addView bottom               Override     public void onClick View v               show a message with the button s ID         Toast toast   Toast makeText AndroidWalkthroughApp1 this   You clicked button     v getId    Toast LENGTH LONG           toast show                get the parent layout and remove the clicked button         RelativeLayout parentLayout    RelativeLayout v getParent            parentLayout removeView v

[android] How to create a RelativeLayout programmatically with two buttons one on top of the other?

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