How to add a button dynamically in Android?

Question

How to add a button dynamically in Android?

Answer 1

I've used this (or very similar) code to add several TextViews to a LinearLayout:

// Quick & dirty pre-made list of text labels...
String names[] = {"alpha", "beta", "gamma", "delta", "epsilon"};
int namesLength = 5;

// Create a LayoutParams...
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
    LinearLayout.LayoutParams.WRAP_CONTENT, 
    LinearLayout.LayoutParams.FILL_PARENT);

// Get existing UI containers...
LinearLayout nameButtons = (LinearLayout) view.findViewById(R.id.name_buttons);
TextView label = (TextView) view.findViewById(R.id.master_label);

TextView tv;

for (int i = 0; i < namesLength; i++) {
    // Grab the name for this "button"
    final String name = names[i];

    tv = new TextView(context);
    tv.setText(name);

    // TextViews CAN have OnClickListeners
    tv.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            label.setText("Clicked button for " + name); 
        }
    });

    nameButtons.addView(tv, params);
}

The main difference between this and dicklaw795's code is it doesn't set() and re-get() the ID for each TextView--I found it unnecessary, although I may need it to later identify each button in a common handler routine (e.g. one called by onClick() for each TextView).

Answer 2

Actually I add to the xml layout file anything that could be used! Then from the source code of the specific Activity I get the object by its id and I "play" with the visibility method.

Here is an example:

((Spinner)findViewById(R.id.email_spinner)).setVisibility(View.GONE);

Answer 3

Check this up.

LinearLayout ll_Main  = new LinearLayout(getActivity());
LinearLayout ll_Row01 = new LinearLayout(getActivity());
LinearLayout ll_Row02 = new LinearLayout(getActivity());

ll_Main.setOrientation(LinearLayout.VERTICAL);
ll_Row01.setOrientation(LinearLayout.HORIZONTAL);
ll_Row02.setOrientation(LinearLayout.HORIZONTAL);

final Button button01    = new Button(getActivity());
final Button button02    = new Button(getActivity());   
final Button button03    = new Button(getActivity());
final Button button04    = new Button(getActivity());

ll_Row01.addView(button01);
ll_Row01.addView(button02);

ll_Row02.addView(button03);
ll_Row02.addView(button04);

ll_Main.addView(ll_Row01);
ll_Main.addView(ll_Row02);

button04.setVisibility(View.INVISIBLE);
button04.setVisibility(View.VISIBLE);

Answer 4

If you want to add dynamically buttons try this:

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    for (int i = 1; i <= 5; i++) {
        LinearLayout layout = (LinearLayout) findViewById(R.id.myLinearLayout);
        layout.setOrientation(LinearLayout.VERTICAL);
        Button btn = new Button(this);
        btn.setText("    ");
        layout.addView(btn);
    }

}

Answer 5

Try following code.

LinearLayout layout = (LinearLayout) findViewById(R.id.llayout); 
layout.setOrientation(LinearLayout.VERTICAL);

Button btn = new Button(this);
btn.setText("Button1");

layout.add(btn);

btn = new Button(this);
btn.setText(Button2);
layout.add(btn);

like this you add Buttons as per your requirements.