Android - Adding Buttons into an existing layout programatically

Question

I am building a soundboard app, where I have some predefined buttons in a tablelayout, which is nested inside a relative layout. The layout is an own fragment (I use multiple tabs for different categories).

(I will post an image here as soon as I have the 10 reps)

Sound and tabs are working fine, now I want to implement the function, that you generate a new button, once you click the "+" button and that the "+" button moves one row beneath the new button.

Is there a way to generate a new tablelayout, with the same attributes as the already existing without having to use blanks inside the xml-file?

the picture is nice but actually it would be better if you had post some code — Blackbelt
– Blackbelt, Commented Feb 27, 2014 at 11:41
Use two rel layouts one for btns and another for + btn(with property bellow) and add button at first rel layout with property bellow last btns id... — Pramod
– Pramod, Commented Feb 27, 2014 at 11:50
I am having trouble adding a new Layout programmatically to the existing one. — Stef
– Stef, Commented Feb 27, 2014 at 12:50

user3217803 · Accepted Answer · 2014-02-27 12:01:36Z

2

try this simple example and modify as per your requirement

 public class MainActivity extends Activity {
        Context context;
        ScrollView scrollView;
        LinearLayout container;
        LinearLayout layout;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            context = this;
            setContentView(R.layout.activity_main);
             layout = (LinearLayout) findViewById(R.id.LinearAdd);


        }

        public void addButton(View view) {
            Button button  = new Button(MainActivity.this);
            LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT );
            button.setLayoutParams(lp);
            button.setText("ADDED");
            layout.addView(button);
        }

    }

And this your xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <LinearLayout
        android:id="@+id/LinearAdd"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="70"
        android:orientation="vertical" >

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="addButton"
            android:text="click to add" />
    </LinearLayout>

</LinearLayout>

answered Feb 27, 2014 at 12:01

user3217803

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2 Comments

Stef Over a year ago

If I want to put this code outside of the MainActivity into a seperate Activity only for generating buttons, how do I have to call the function from inside my fragment?

user3217803 Over a year ago

Use this xml to set view for your fragment class and also put on click method in to your fragment class. that will work

Stef · Accepted Answer · 2014-02-27 12:35:06Z

Here is my layout fragment code:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<TableLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:stretchColumns="*"
    android:id="@+id/tableLayout">


    <TableRow
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_column="1">
        <Button
            android:background="@drawable/button"
            style="@style/button_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tab01sound01"
            android:layout_column="0"
            android:text="@string/buttonAlan" />
    </TableRow>

</TableLayout>

<TableLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:stretchColumns="*"
    android:layout_below="@+id/tableLayout2"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:id="@+id/thirdTable">

</TableLayout>

</RelativeLayout>

Stef · Accepted Answer · 2014-02-27 12:49:15Z

And this is the code from my first fragment tab

public class Tab1 extends Fragment {

private int buttonAmount = MainActivity.getButtonAmountTab1();
private Button[] button = new Button[buttonAmount + 1];
private Sound sound;
private String packageName = MainActivity.getStringPackageName();
private Button addButton;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    sound = MainActivity.getSound();

    View rootView = inflater.inflate(R.layout.fragment_fun, container, false);

    //This generates the Audio functionality for each button

    for (int i = 1; i < buttonAmount + 1; i++) {
        String buttonID = "tab01sound0" + i;
        int resID = getResources().getIdentifier(buttonID, "id", packageName);
        final int audioID = getResources().getIdentifier(buttonID, "raw", packageName);
        button[i] = (Button) rootView.findViewById(resID);
        registerForContextMenu(button[i]);
        button[i].setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                sound.playSound(audioID);
            }

        });

    }

    //functionality for the "+" button

    addButton = (Button) rootView.findViewById(R.id.addButton);
    addButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            CreateDialog newDialog = new CreateDialog();
            newDialog.AlertBox(getActivity());

        }
    });

    return rootView;

}

}

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