how can i creat a Button in java Code

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hi everyone . i want to create a Button in my android app

this is my code :
Button B=new Button(this);
B.setText="do!";

when i run my app i cant see any Button in my device!

Posted 20-Sep-13 4:10am

seyed mahmud shahrokni

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[no name] 20-Sep-13 10:13am

What are you adding the button to?

Richard C Bishop 20-Sep-13 10:14am

Indeed, you are not adding the button to anything.

Sergey Alexandrovich Kryukov 20-Sep-13 10:19am

Do the comments above close the issue?
It's apparent that just calling a constructor does not change the UI. Now grab the API documentation and see how add one control to its parent...
—SA

2 solutions

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ridoy · Answer 1 · 2013-09-20T05:45:00

Solution 2

You need to do something like:

Java

Button myButton = new Button(this);
myButton.setText("Click Me!");

LinearLayout ln = (LinearLayout)findViewById(R.id.buttonlayout);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
ln.addView(myButton, lp);

Posted 20-Sep-13 5:45am

ridoy

Comments

seyed mahmud shahrokni 21-Sep-13 9:02am

hi , i have 2 problems whit your code

i dont have any buttonlayout in my xml codes , and i dont know what is my default LinearLayout name .
what is LayoutParams , when i wrote it , it was rejected by compiler ! should i import anything to my code ??

ridoy 21-Sep-13 9:51am

So you need to look at this tutorial:http://thedeveloperworldisyours.com/android/add-a-textview-and-a-button-to-linear-layout-programmatically/

Richard MacCutchan · Answer 2 · 2013-09-20T04:42:00

Solution 1

See http://docs.oracle.com/javase/tutorial/uiswing/index.html[^].

Posted 20-Sep-13 4:42am

Richard MacCutchan