How to Add a Textview to a Linearlayout Dynamically in Android

How to add a TextView to a LinearLayout dynamically in Android?

LayoutParams lparams = new LayoutParams(
   LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
TextView tv=new TextView(this);
tv.setLayoutParams(lparams);
tv.setText("test");
this.m_vwJokeLayout.addView(tv);

You can change lparams according to your needs

Adding TextViews inside horizontal LinearLayout dynamically

The interestWidth and parentWidth are initially 0 because they have not been laid out when getWidth is called.

get width for dynamically created textViews

The above link helped me getting width of dynamically created textViews from interestList.

And by using ViewTreeObserver on interestLinearLayout I was able to get the width of LinearLayout after it was laid out.

Finally, the above code should be modified as below to add textViews from JAVA inside a LinearLayout.

       final LinearLayout interestLinearLayout = findViewById(R.id.interests);
       interestLinearLayout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                interestLinearLayout.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                String interestList[]={"Travel","Music","Photography","Sports","Dance","Animals","SciFi Movies"};
                int interestWidth =0;
                int parentWidth = interestLinearLayout.getWidth(); // got width inside view tree observer for linearlayout
                for(String interest: interestList) {
                    TextView textView = new TextView(MainActivity.this);
                    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
                    params.setMargins(2,0,10,2);
                    textView.setLayoutParams(params);
                    textView.setPadding(2, 2, 2, 2);
                    textView.setText(interest);
                    textView.setIncludeFontPadding(true);
                    textView.measure(0,0); //using approach mentioned in link to get width of text views
                    interestWidth += textView.getMeasuredWidth(); 
                    if(interestWidth<parentWidth)
                        interestLinearLayout.addView(textView);
                    else
                        break;
                }
            }
        });

Dynamically add textViews to a linearLayout

Something like the following should be what you need:

final int N = 10; // total number of textviews to add

final TextView[] myTextViews = new TextView[N]; // create an empty array;

for (int i = 0; i < N; i++) {
    // create a new textview
    final TextView rowTextView = new TextView(this);

    // set some properties of rowTextView or something
    rowTextView.setText("This is row #" + i);

    // add the textview to the linearlayout
    myLinearLayout.addView(rowTextView);

    // save a reference to the textview for later
    myTextViews[i] = rowTextView;
}

Horizontally Add TextViews to Equally Weighted Linear Layout Dynamically

Remove in your LinearLayout android:weightSum="1" and define this LinearLayout.LayoutParams:

    val linearLayout : LinearLayout = findViewById(R.id.layout)
    val lp = LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT)
    lp.weight = 1f

Then just apply to the views added in the layout:

    val textView : TextView = TextView(context)
    textView.setText("Text1")
    textView.height = ...
    //...

    val textView2 : TextView = TextView(context)
    textView2.setText("Text2")
    textView2.height = ...
    //....

    linearLayout.addView(textView, lp)
    linearLayout.addView(textView2, lp)

To add textview dynamic at run time Android

You could create a TextView dynamically like this for example:

//create a TextView with Layout parameters according to your needs
LinearLayout.LayoutParams lparams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
//if your parent Layout is relativeLayout, just change the word LinearLayout with RelativeLayout
TextView tv=new TextView(this);
tv.setLayoutParams(lparams);
tv.setText("test");
//get the parent layout for your new TextView and add the new TextView to it
LinearLayout linearLayout = (LinearLayout) findViewById(R.id.ll_example);
linearLayout.addView(tv);

And in the tv.setText(...); line you could set the text, that your got from your database.

Dynamically Creating Multiple TextViews in LinearLayout

It's giving NPE because you are not setting your activity layout properly.

Do this

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.whereLinearLayoutMasterIs); // Add your layout here
    root=(LinearLayout)findViewById(R.id.master);
    t=new TextView[10];
   LinearLayout.LayoutParams dim=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    for(int i=0;i<10;i++)
    {
        t[i]=new TextView(this);
        t[i].setLayoutParams(dim);
        t[i].setText("YOHOHO: "+i);
        root.addView(t[i]);
    }
}

NOTER.layout.whereLinearLayoutMasterIs is indicative, use your layout in which R.id.master is

Adding multiple TextViews into LinearLayout dynamically

You are adding the same view to the layout again.
Change your function to

public void addNotHiredRoomsToLayout() {

for (String name : Constants.existingRoomNames) {
    textView2 = new TextView(this);
    boolean contains = false;
    for (Room room : mCalendarModel.mList.getRoomList()) {
        if (room.getName().equals(name)) {
            contains = true;
        }
    }
    if (!contains) {
        textView2.setText(name + ": Free");
        linearLayout.addView(textView2);
    }
}
}

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