android creating a RelativeLayout programmatically

Question

I'm having some troubles creating a relativeLayout programmatically.For better understanding I attached a picture below. The things with plus and minus are buttons, which should also be dynamically created and added to the layout. The values of tv4 and tv5 should increase/decrease accordingly to button presses.

What I have done so far:

1) creating the layout:

RelativeLayout rl = new RelativeLayout(this); rl.setId(i); rl.setBackgroundResource(R.drawable.bg); RelativeLayout.LayoutParams Lparams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT); Lparams.addRule(RelativeLayout.BELOW, R.id.RL_default); Lparams.setMargins(3, 5, 3, 0); rl.setLayoutParams(Lparams);

2) adding the tv1:

 Lparams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT); Lparams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE); Lparams.setMargins(10, 0, 0, 0); TextView txt = new TextView(this); txt.setTextColor(Color.parseColor("#FFFFFF")); txt.setId(x); txt.setTextSize(25); txt.setLayoutParams(Lparams); txt.setText(name); rl.addView(txt);

3) adding the tv2:

 Lparams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT); Lparams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE); Lparams.addRule(RelativeLayout.BELOW, txt.getId()); Lparams.setMargins(10, 0, 0, 0); TextView txtS = new TextView(this); txtS.setId(y); txtS.setText("Test: "); txtS.setTextSize(22); txtS.setLayoutParams(Lparams); txtS.setGravity(Gravity.BOTTOM); txtS.setPadding(0, 0, 0, 20); rl.addView(txtS);

4) now I want to create the first button:

 Button btnSminus = new Button(this); btnSminus.setId(btn1); btnSminus.setText("<"); btnSminus.setTextSize(20); Lparams= new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); Lparams.addRule(RelativeLayout.RIGHT_OF, txtS.getId()); btnSminus.setLayoutParams(Lparams); rl.addView(btnSminus);

The problem is, the the button View seems to just disappear from the screen when the line Lparams.addRule(RelativeLayout.RIGHT_OF, txtS.getId()); is executed. What can be the reason?

enter image description here

Piro · Accepted Answer · 2012-12-25 17:58:02Z

2

My guess would be that it's because you set the width of txtS to match_parent, so the button gets pushed off the screen. You can fix that by changing that to wrap_content.

answered Dec 25, 2012 at 17:58

Piro

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Droidman Over a year ago

was a really dumb mistake, thank you. The problem is gone. Just one more question: what must I do in my onPause() or onDestroy() method to get the dynamically added layout saved? Since it disappears after the app is restarted..

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