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How to add a button dynamically in Android?

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18 Answers 18

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132 
Button myButton = new Button(this);
myButton.setText("Push Me");

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

Have a look to this example

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3 Comments

I updated the URL because the old one gave a 404. Please check that I referenced the right page.
Can you please fully qualify LayoutParams? I see more than 12 classes with this name.
@Saeed In this specific example it's the LayoutParams belonging to LinearLayout. android.widget.LinearLayout.LayoutParams
56

try this:

for (int i = 1; i <= 20; i++) {
    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT);
    Button btn = new Button(this);
    btn.setId(i);
    final int id_ = btn.getId();
    btn.setText("button " + id_);
    btn.setBackgroundColor(Color.rgb(70, 80, 90));
    linear.addView(btn, params);
    btn1 = ((Button) findViewById(id_));
    btn1.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            Toast.makeText(view.getContext(),
                    "Button clicked index = " + id_, Toast.LENGTH_SHORT)
                    .show();
        }
    });
}
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2 Comments

why is the button added, then gotten before setting the click listener. couldn't you add the listener, then add it to the layout and be done?
Best answer because you can click on buttons by setting an id :)
12

Try this:

LinearLayout ll = (LinearLayout)findViewById(R.id.layout);

Button btn = new Button(this);
btn.setText("Manual Add");
btn.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
ll.addView(btn);
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2 Comments

what is R.id.layout referring to here? I keep getting layout as unresolved
@AnnaGoldberg in your relevant xml file you should have a LinearLayout defined. In this excerpt they gave their LinearLayout an id called layout, like so: android:id="@+id/layout"in their LinearLayout xml definition.
7 
for (int k = 1; k < 100; k++) {
    TableRow row = new TableRow(this);

    innerloop:
    for (int l = 1; l < 4; l++) {
        btn = new Button(this);
        TableRow.LayoutParams tr = new TableRow.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        layout.setWeightSum(12.0f);
        tr.weight = 0;
        btn.setLayoutParams(tr); 
        btn.setTextColor(a);
        btn.setHeight(150);

        btn.setWidth(150);
        btn.setId(idb);
        btn.setText("Button " + idb);
        row.addView(btn);
    }
}
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6

try this 

private void createLayoutDynamically(int n) {

    for (int i = 0; i < n; i++) {
        Button myButton = new Button(this);
        myButton.setText("Button :"+i);
        myButton.setId(i);
        final int id_ = myButton.getId();

        LinearLayout layout = (LinearLayout) findViewById(R.id.myDynamicLayout);
        layout.addView(myButton);

        myButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                Toast.makeText(DynamicLayout.this,
                        "Button clicked index = " + id_, Toast.LENGTH_SHORT)
                        .show();
            }
        });
    }
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6 
Button btn = new Button(this);
btn.setText("Submit");
LinearLayout linearLayout = (LinearLayout)findViewById(R.id.buttonlayout);
LayoutParams buttonlayout = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
linearLayout.addView(btn, buttonlayout);
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5

Try this code

 Button btn=new Button(this);
btn.setId(btn);
btn.setBackgroundResource(R.drawable.image);
btn.setMinimumHeight(150);
btn.setMinimumWidth(150);
Relativelayout.addView(btn);
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5

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);
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4

Try this code. It will work fine..

public class DynamicViewsActivity extends Activity {

Button button;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //setContentView(R.layout.activity_dynamic_views);
    ScrollView scrl=new ScrollView(this);
    final LinearLayout ll=new LinearLayout(this);
    ll.setOrientation(LinearLayout.HORIZONTAL);
    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    layoutParams.setMargins(100, 500, 100, 200);
    scrl.addView(ll);
    Button add_btn=new Button(this);
    add_btn.setText("Click Here");

    ll.addView(add_btn, layoutParams);


    final Context context = this;

    add_btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            Intent intent = new Intent(context, App2Activity.class);
            startActivity(intent);
        }
    });
    this.setContentView(scrl);
}
}
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3

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.

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3 
public void add_btn() {

    lin_btn.setWeightSum(3f);
    for (int j = 0; j < 3; j++) {
        LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        params1.setMargins(10, 0, 0, 10);
        params1.weight = 1.0f;

        LinearLayout ll;
        ll = new LinearLayout(this);
        ll.setGravity(Gravity.CENTER_VERTICAL);
        ll.setOrientation(LinearLayout.HORIZONTAL);
        ll.setLayoutParams(params1);

        final Button btn;
        btn = new Button(DynamicActivity.this);

        btn.setText("A"+(j+1));
        btn.setTextSize(15);
        btn.setId(j);
        btn.setPadding(10, 8, 10, 10);

        ll.addView(btn);

        lin_btn.addView(ll);


        btn.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

                if(v.getId()==0)
                {
                    txt_text.setText("Hii");
                }else if(v.getId()==1)
                {
                    txt_text.setText("hello");
                }else if(v.getId()==2)
                {
                    txt_text.setText("how r u");
                }



            }
        });
    }

}
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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);

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1 Comment

This is not what is being asked. When people ask about adding dynamically they mean without a layout. What you are doing is unhiding ... not adding.
2

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).

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2 
Button myButton = new Button(this);
myButton.setId(123);
myButton.setText("Push Me");


LinearLayout ll = (LinearLayout)findViewById(R.id.buttonlayout);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
ll.addView(myButton, lp);
 myButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                Toast.makeText(DynamicLayout.this,
                        "Button clicked index = " + id_, Toast.LENGTH_SHORT)
                        .show();
            }
        });
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2

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);
    }

}
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1

You could create a base layout for your button and dynamically change only what is specific, like this project I made to run different exercises from a Material Design course I'm taking:

In this example, I use a preconfigured AppCompatButton:

layout_base_button.xml

<android.support.v7.widget.AppCompatButton
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/btn_base"
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_marginTop="8dp"
    style="@style/RaisedButton"
    >

</android.support.v7.widget.AppCompatButton>


<style name="RaisedButton" parent="Widget.AppCompat.Button.Colored">
    <item name="android:textSize">11sp</item>
    <item name="android:textStyle">bold</item>
</style>

And in the MainActivity I created some instances and changed what I need, like the button text and onClick event: 

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="udemy.android.materialdesign.MainActivity">

    <LinearLayout
        android:id="@+id/base_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >

    </LinearLayout>


</ScrollView>



public class MainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        LinearLayout baseLayout = findViewById(R.id.base_layout);

        baseLayout.addView(createButton("TextFields", baseLayout,
                view -> startActivity(createIntent(TextFieldsActivity.class))
        ));

        baseLayout.addView(createButton("Buttons", baseLayout,
                view -> startActivity(createIntent(ButtonsActivity.class))
        ));

        baseLayout.addView(createButton("Toolbar", baseLayout,
                view -> startActivity(createIntent(ToolbarActivity.class))
        ));

    }

    private View createButton(String text, LinearLayout baseLayout, View.OnClickListener onClickEvent) {
        View inflated = LayoutInflater.from(this).inflate(R.layout.layout_base_button, baseLayout, false);
        AppCompatButton btnBase = inflated.findViewById(R.id.btn_base);

        btnBase.setText(text);
        btnBase.setOnClickListener(onClickEvent);
        return btnBase;
    }

    private Intent createIntent(Class<?> cls) {
        return new Intent(this, cls);
    }
}

Sorry for being late...

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0

I needed to create buttons even more dynamically, not just in runtime but by pressing another button. So clicking this button will dynamically create more buttons under it. I recommend having a ScrollView on the activity or limit the number of clicks - so no buttons go offscreen.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
  <androidx.constraintlayout.widget.ConstraintLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".MainActivity">

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:layout_editor_absoluteY="675dp">

    <LinearLayout
        android:id="@+id/layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <Button
            android:id="@+id/newItemButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Button1" />

    </LinearLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        LinearLayout ll = (LinearLayout)findViewById(R.id.layout); //Screen layout
        LinearLayout.LayoutParams params = new 
        LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 
        LinearLayout.LayoutParams.WRAP_CONTENT);

        final Button newItemButton = findViewById(R.id.newItemButton);
        newItemButton.setText("Create new button");

        newItemButton.setOnClickListener(new View.OnClickListener() {
            int pressCount = 1; //Count how many times button was pressed
            public void onClick(View v) {

                newItemButton.setText("Button Clicked: "+pressCount);
                createButton(pressCount, params, ll); //Click to create new button
                pressCount++;
            }
        });


} //end of onCreate

public void createButton(int id, LinearLayout.LayoutParams inputParams, LinearLayout inputLL) {
        Button outButton = new Button(this);
        outButton.setId(id);
        final int id_ = outButton.getId();
        outButton.setText("Button " + id_);
        inputLL.addView(outButton, inputParams);
    }

}//end of AppCompatActivity

This will give you an activity with a button. When you click on that button, you spawn a new button underneath it. If you spawn so many that they do not fit on the screen, the scrollView will take care of that.

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-4

In mainactivity.xml write:

<Button
    android:id="@+id/search"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Search" 
    android:visibility="invisible"/>

In main.java write:

Button buttonSearch;
buttonSearch = (Button)findViewById(R.id.search);
buttonSearch.setVisibility(View.VISIBLE);
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