android - setting LayoutParams programmatically

Question

I putting an in-game chat module into an app  I am adding text messages as they are received into a LinearLayout view  I want to set the layout params to the TextView but the following code is crashing and the error messages befuddle me   private void addChat String chat  String when   Boolean mine        int leftMargin       TextView tv   new TextView this       llview addView tv       tv setTextColor Color WHITE       tv setTextSize 2 25       tv setText chat       if  mine            leftMargin   5          tv setBackgroundColor 0x7C5B77             else           leftMargin   50          tv setBackgroundColor 0x778F6E             final ViewGroup MarginLayoutParams lpt   MarginLayoutParams tv getLayoutParams        lpt setMargins leftMargin lpt topMargin lpt rightMargin lpt bottomMargin        tv setLayoutParams new ViewGroup LayoutParams              ViewGroup LayoutParams WRAP CONTENT              ViewGroup LayoutParams WRAP CONTENT         when it runs  all of the above code executes but it crashes in android runtime as   03-13 14 15 38 513  E AndroidRuntime 12985   java lang ClassCastException       android view ViewGroup LayoutParams   and stepping through with the debugger  it actually processes all of these lines  but then barfs when trying to render with an equally cryptic exception detailed message   android view ViewGroup LayoutParams   So  what have done to get to this state  What should I be doing to have alternating left right indented messages

User · Answer

For Xamarin Android align to the left of an object int dp24    int TypedValue ApplyDimension  ComplexUnitType Dip  24  Resources System DisplayMetrics                RelativeLayout LayoutParams lp   new RelativeLayout LayoutParams  dp24  dp24                lp AddRule  LayoutRules CenterInParent  1                lp AddRule  LayoutRules LeftOf    Id of the field Eg m Button Id                 m Button LayoutParameters   lp

User · Answer

after creating the view we have to add layout parameters    change like this  TextView tv   new TextView this   tv setLayoutParams new ViewGroup LayoutParams          ViewGroup LayoutParams WRAP CONTENT          ViewGroup LayoutParams WRAP CONTENT     llview addView tv   tv setTextColor Color WHITE   tv setTextSize 2 25   tv setText chat   if  mine        leftMargin   5      tv setBackgroundColor 0x7C5B77     else       leftMargin   50      tv setBackgroundColor 0x778F6E     final ViewGroup MarginLayoutParams lpt   MarginLayoutParams tv getLayoutParams    lpt setMargins leftMargin lpt topMargin lpt rightMargin lpt bottomMargin

User · Answer

LinearLayout LayoutParams param   new LinearLayout LayoutParams                       width   ViewGroup LayoutParams MATCH PARENT                       height   ViewGroup LayoutParams MATCH PARENT                       weight   1 0f                            YOUR VIEW setLayoutParams param

User · Answer

int dp1    int  TypedValue applyDimension TypedValue COMPLEX UNIT DIP  1              context getResources   getDisplayMetrics      tv setLayoutParams new ViewGroup LayoutParams  ViewGroup LayoutParams WRAP CONTENT  dp1   100       if you want to set layout height to 100dp  llview addView tv

User · Answer

Just replace from bottom  and add this   tv setLayoutParams new ViewGroup LayoutParams      ViewGroup LayoutParams WRAP CONTENT      ViewGroup LayoutParams WRAP CONTENT      before   llview addView tv

[android] android - setting LayoutParams programmatically

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