How to add a TextView to LinearLayout in Android

Question

I am trying to add TextViews to my xml-defined layout in code  I have a xml-sheet  where a lot of Views are defined  But I have to add some views in code  so a create a LinearLayout in the xml-sheet    lt LinearLayout xmlns android  http   schemas android com apk res android  android layout width  wrap content  android id    id info  android layout height  wrap content   android orientation  vertical  gt   lt  LinearLayout gt    And in this layout  I like to add my TextView       View linearLayout    findViewById R id info         LinearLayout layout    LinearLayout  findViewById R id info         TextView valueTV   new TextView this       valueTV setText  hallo hallo        valueTV setId 5       valueTV setLayoutParams new LayoutParams              LayoutParams FILL PARENT              LayoutParams WRAP CONTENT           LinearLayout  linearLayout  addView valueTV     But I only get the following error message     java lang ClassCastException  android widget TextView   How can I do it   Thanks for you help  Martin

User · Answer

You can add a TextView to your linear layout programmatically like this   LinearLayout linearLayout    LinearLayout  findViewById R id mylayout   TextView txt1   new TextView MyClass this   linearLayout setBackgroundColor Color TRANSPARENT   linearLayout addView txt1

User · Answer

In Kotlin you can add Textview as follows   val textView   TextView activity  apply               layoutParams   LinearLayout LayoutParams                  LinearLayout LayoutParams MATCH PARENT                  LinearLayout LayoutParams WRAP CONTENT               apply                   setMargins 0  20  0  0                  setPadding 10  10  0  10                            text    quot SOME TEXT quot              setBackgroundColor ContextCompat getColor this MainActivity  R color colorPrimary               setTextColor ContextCompat getColor this MainActivity  R color colorPrimaryDark               textSize   16 0f             typeface   Typeface defaultFromStyle Typeface BOLD             linearLayoutContainer addView textView

User · Answer

for int j 0 j lt 30 j          LinearLayout childLayout   new LinearLayout MainActivity this       LinearLayout LayoutParams linearParams   new LinearLayout LayoutParams          LayoutParams WRAP CONTENT          LayoutParams WRAP CONTENT       childLayout setLayoutParams linearParams        TextView mType   new TextView MainActivity this       TextView mValue   new TextView MainActivity this        mType setLayoutParams new TableLayout LayoutParams          LayoutParams WRAP CONTENT          LayoutParams WRAP CONTENT  1f        mValue setLayoutParams new TableLayout LayoutParams          LayoutParams WRAP CONTENT          LayoutParams WRAP CONTENT  1f         mType setTextSize 17       mType setPadding 5  3  0  3       mType setTypeface Typeface DEFAULT BOLD       mType setGravity Gravity LEFT   Gravity CENTER        mValue setTextSize 16       mValue setPadding 5  3  0  3       mValue setTypeface null  Typeface ITALIC       mValue setGravity Gravity LEFT   Gravity CENTER        mType setText  111        mValue setText  111         childLayout addView mValue  0       childLayout addView mType  0        linear addView childLayout

User · Answer

You need to access the layout via it s layout resource  not an id resource which is not guaranteed unique   The resource reference should look like R layout my cool layout where your above XML layout is stored in res layout my cool layout xml

User · Answer

LinearLayout LayoutParams layoutParams   layoutParams  new LinearLayout LayoutParams LinearLayout LayoutParams FILL PARENT  LinearLayout LayoutParams WRAP CONTENT

User · Answer

Here s where the exception occurs    LinearLayout  linearLayout  addView valueTV     addView method takes in a parameter of type View  not TextView  Therefore    typecast  the valueTv object into a View object  explicitly   Therefore  the corrected code would be      LinearLayout  linearLayout  addView  TextView valueTV

User · Answer

You should use something similar to this for adding TextView to LinearLayout dynamically   LinearLayout linearLayout   getActivity   findViewById R id infoLayout    TextView valueTV   new TextView context   valueTV setText  hallo hallo    valueTV setId Integer parseInt  5     valueTV setLayoutParams new LinearLayout LayoutParams         LinearLayout LayoutParams FILL PARENT         LinearLayout LayoutParams WRAP CONTENT     linearLayout addView valueTV     getActivity   is used for inside Fragments  you can use context or anything similar per each instance you are inside

User · Answer

try using  LinearLayout linearLayout    LinearLayout findViewById R id info       linearLayout addView valueTV     also make sure that the layout params you re creating are LinearLayout LayoutParams

User · Answer

Hey i have checked your code  there is no serious error in your code  this is complete code   main xml -   lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android  android layout width  wrap content  android id    id info  android layout height  wrap content   android orientation  vertical  gt   lt  LinearLayout gt    this is Stackoverflow java  import android app Activity  import android os Bundle  import android view View  import android view ViewGroup LayoutParams  import android widget LinearLayout  import android widget TextView   public class Stackoverflow extends Activity           Called when the activity is first created          Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main           View linearLayout    findViewById R id info             LinearLayout layout    LinearLayout  findViewById R id info            TextView valueTV   new TextView this           valueTV setText  hallo hallo            valueTV setId 5           valueTV setLayoutParams new LayoutParams LayoutParams MATCH PARENT LayoutParams WRAP CONTENT               LinearLayout  linearLayout  addView valueTV             copy this code  and run it  it is completely error free  take care

[java] How to add a TextView to LinearLayout in Android

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