Adding Content to a Linear Layout Dynamically

Adding content to a linear layout dynamically?

In your onCreate(), write the following

LinearLayout myRoot = (LinearLayout) findViewById(R.id.my_root);
LinearLayout a = new LinearLayout(this);
a.setOrientation(LinearLayout.HORIZONTAL);
a.addView(view1);
a.addView(view2);
a.addView(view3);
myRoot.addView(a);

view1, view2 and view3 are your TextViews. They're easily created programmatically.

How to dynamically add LinearLayout on Android?

LinearLayout lLayout = new LinearLayout(context);
parentWidget.addView(lLayout);

How to add view in a linear layout dynamically

First, you have to get familiar with java (in my opinion).

1) declare a linear layout at XML layout. like:

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
       xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="vertical"
       android:id="@+id/AdvancedCatalogContainer"
       >
        </LinearLayout>

2) Get a referance to that view:

private LinearLayout rootView=findViewById(R.id.AdvancedCatalogContainer);

3) Declare a method like this:

public void fillLayout(LinearLayout root,TextView  v){
  v.setText("your text")
  root.addView(v);
}

4) Call this method in your onCreate method or anywhere in ui thread.

... extends AsycTask<blah,blah,blah>{
onPostExecute(blah){

  for(many times){

    fillLayout(linearLayout,textView);

  }

}

Edit

If you want to show a collection of data like a scrolling list please consider using ListView or RecycleView instead.

Dynamically adding a View to a LinearLayout with height of wrap_content doesn't display anything

You need to provide measurements of ImageCanvas with an onMeasure() override:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    setMeasuredDimension(icon.getWidth(),icon.getHeight());
}

See Custom View Components.

When you explicitly supply a height, that height is set in the custom component. With wrap content, the height gets set to zero since it is neither specified nor explicitly measured. The above code will provide the correct measurements.

(icon.getHeight() is what you really need and corresponds to wrap_content. You may need a different value for icon.getWidth() depending upon your design.)

Not sure why a NestedScrollView has any effect, but the code above will help.

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;
                }
            }
        });

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)

adding the views dynamically with layout weight property in Android

Problem is with your layout params. You need to use like below

   private void addLayout(String textView1Text, String textView2Text, String checkBoxText) {
       LinearLayout.LayoutParams param = new LinearLayout.LayoutParams( LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 1.0f);  
       mLinearLayout.setLayoutParams(param);

       TextView tv1 = new TextView(this);
       tv1.setText(textView1Text);
       LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(0, 100);  
       lp.weight =  0.1f;
       tv1.setLayoutParams(lp);
       mLinearLayout.addView(tv1);

       TextView tv2 = new TextView(this);
       tv2.setText(textView2Text);
       LinearLayout.LayoutParams lp1 = new LinearLayout.LayoutParams(0, 100);   
       lp1.weight =  0.6f;
       tv2.setLayoutParams(lp1);
       mLinearLayout.addView(tv2);

       CheckBox cb = new CheckBox(this);
       cb.setText(textView2Text);
       LinearLayout.LayoutParams lp2 = new LinearLayout.LayoutParams(0, 100);  
       lp2.weight =  0.3f;
       cb.setLayoutParams(lp2);
       mLinearLayout.addView(cb);

    }

Need to add layout dynamically

Use the LayoutInflater to create a view based on your layout template, and then inject it into the view where you need it.

 public static NavigableMap<Integer, String> navigableMap = new TreeMap<Integer, String>();

    public static int count = 0; // to count no of views added
     public static void add_new(final Activity activity)
        {
            final LinearLayout linearLayoutForm = (LinearLayout) activity.findViewById(R.id.formLayout);
            final LinearLayout newView = (LinearLayout) activity.getLayoutInflater().inflate(R.layout.view_to_add, null);
            newView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
            final EditText edit_new = (EditText) newView.findViewById(R.id.fieldAttr2);

            edit_new.setId(id++); // It will assign a different id to edittext each time while adding new view.
            Log.i("actv id",edit_new.getId()+""); // You can check the id assigned to it here.

            // use a Hashmap or navigable map (helpful if want to navigate through map)
            // to store the values inserted in edittext along with its ids.

            edit_new.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View view, boolean b) {
                navigableMap.put(edit_new.getId(), edit_new.getText().toString());
                Log.i("navigablemap", navigableMap.toString());
                }
            });

            // you can get values directly through map by referencing its ids.

            // OR

            EditText actv_uc = (EditText) linearLayoutForm.findViewById(navigableMap.lastKey()); 
            // Provide the id of edittext you want to access
            actv_uc.getText(); // to get value of EditText
            actv_uc.setText("");
            linearLayoutForm.addView(newView);
            count++;
        }

Call this function whenever you want to add new view. If you are calling this in Activity, then there is no need to pass Activity object as parameter. but if you are using this in fragment, then need to pass a Parent Activity object to function.

Very easy and helpful tutorial for adding views dynamically :-
http://android-er.blogspot.in/2013/05/add-and-remove-view-dynamically.html

Hope this will help you. Thank you

getting text from dynamically added edit text in linear layout

You can do it like this:

First of All in your class you add a field:

...
EditText myEditText;
...

Then after adding your linearLayout you store your editText in the field like this:

...
final LinearLayout newView = (LinearLayout)getLayoutInflater().inflate(R.layout.single_skill_row, null);
myEditText = newView.findViewById(R.id.editDescricao);
...

After that in the onClick callback of your button you can get it's text like this:

register_btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
        String text = myEditText.getText().toString();
});

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

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