Martin Martin - 2 months ago 17
Android Question

android - setting LayoutParams programmatically

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 ?

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);
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