android - Programatcally remove margin from FrameLayout with LayoutParams -


i have framelayout looks this:

 <relativelayout     android:layout_width="match_parent"     android:layout_height="wrap_content">      <framelayout         android:layout_margintop="56dp"         android:layout_marginbottom="50dp"         android:id="@+id/main_frag"         android:layout_width="match_parent"         android:layout_height="match_parent" />            // other stuff        </relativelayout>

however when change margins programitcally classcastexception.

        framelayout fl = (framelayout) findviewbyid(r.id.main_frag);         framelayout.layoutparams params = (framelayout.layoutparams) fl.getlayoutparams();         params.setmargins(50, 0, 0, 0);         fl.setlayoutparams(params);

here how trying:

        framelayout fl = (framelayout) findviewbyid(r.id.main_frag);         framelayout.layoutparams params = (framelayout.layoutparams) fl.getlayoutparams();         params.setmargins(50, 0, 0, 0);         fl.setlayoutparams(params);

here logcat:

04-25 16:18:08.385: e/androidruntime(27682): java.lang.runtimeexception: unable start activity componentinfo{com.---.---/com.------.---.mainfragmentactivity}: java.lang.classcastexception: android.widget.relativelayout$layoutparams cannot cast android.widget.framelayout$layoutparams 04-25 16:18:08.385: e/androidruntime(27682):    @ android.app.activitythread.performlaunchactivity(activitythread.java:2314) 04-25 16:18:08.385: e/androidruntime(27682):    @ android.app.activitythread.handlelaunchactivity(activitythread.java:2388) 04-25 16:18:08.385: e/androidruntime(27682):    @ android.app.activitythread.access$800(activitythread.java:148) 04-25 16:18:08.385: e/androidruntime(27682):    @ android.app.activitythread$h.handlemessage(activitythread.java:1292) 04-25 16:18:08.385: e/androidruntime(27682):    @ android.os.handler.dispatchmessage(handler.java:102) 04-25 16:18:08.385: e/androidruntime(27682):    @ android.os.looper.loop(looper.java:135) 04-25 16:18:08.385: e/androidruntime(27682):    @ android.app.activitythread.main(activitythread.java:5312) 04-25 16:18:08.385: e/androidruntime(27682):    @ java.lang.reflect.method.invoke(native method) 04-25 16:18:08.385: e/androidruntime(27682):    @ java.lang.reflect.method.invoke(method.java:372) 04-25 16:18:08.385: e/androidruntime(27682):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:901) 04-25 16:18:08.385: e/androidruntime(27682):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:696) 04-25 16:18:08.385: e/androidruntime(27682): caused by: java.lang.classcastexception: android.widget.relativelayout$layoutparams cannot cast android.widget.framelayout$layoutparams 04-25 16:18:08.385: e/androidruntime(27682):    @ com.---.---.mainfragmentactivity.oncreate(mainfragmentactivity.java:81) 04-25 16:18:08.385: e/androidruntime(27682):    @ android.app.activity.performcreate(activity.java:5953) 04-25 16:18:08.385: e/androidruntime(27682):    @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1128) 04-25 16:18:08.385: e/androidruntime(27682):    @ android.app.activitythread.performlaunchactivity(activitythread.java:2267)

i don't understand how relativelayout involved here?

the layoutparams class dictated parent, not child. layoutparams affect framelayout relativelayout.layoutparams. layoutparams affects child of framelayout framelayout.layoutparams.


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