<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/bacground_main"> <ScrollView android:layout_width="match_parent" android:layout_height="match_parent" tools:ignore="ScrollViewCount,UselessParent"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:orientation="vertical" android:textAlignment="center"> <!-- Первая пара --> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/buttonDateDialog" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentStart="true" android:layout_alignParentTop="true" android:layout_marginStart="12dp" android:onClick="OnClick" android:text="@string/day" /> <TextView android:id="@+id/textViewDay" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/button2" android:layout_alignBottom="@+id/button2" android:layout_centerHorizontal="true" android:layout_marginTop="10dp" android:gravity="center_horizontal" android:text="" android:textColor="#fff" android:textSize="18sp" tools:ignore="UnknownId" /> </RelativeLayout> <RelativeLayout android:id="@+id/layoutOne" android:layout_width="300dp" android:layout_height="100dp"> <View android:id="@+id/view_one" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginTop="25dp" android:background="@drawable/shape_one" android:minHeight="100dp" /> <TextView android:id="@+id/textViewOne" android:layout_width="match_parent" android:layout_height="155dp" android:layout_alignParentStart="false" android:layout_below="@+id/text_one_para" android:layout_marginTop="14dp" android:gravity="center_horizontal|center" android:textColor="@android:color/black" android:textSize="16sp" /> <View android:id="@+id/view_one_top" android:layout_width="300dp" android:layout_height="50dp" android:layout_marginTop="25dp" android:background="@drawable/shape_two" /> <TextView android:id="@+id/text_one_para" android:layout_width="300dp" android:layout_height="wrap_content" android:layout_marginBottom="12dp" android:layout_marginTop="45dp" android:gravity="center_horizontal" android:text="@string/title_one_para" android:textColor="@android:color/black" android:textSize="@dimen/title_para" /> </RelativeLayout>

When you click on the button, the size of the layoutOne should change

  public void OnClick(View view) { RelativeLayout relativeLayout = findViewById(R.id.layoutOne); RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) relativeLayout.getLayoutParams(); params.height = 300; relativeLayout.setLayoutParams(params); }

But the error takes off

 E/AndroidRuntime: FATAL EXCEPTION: main Process: com.sfedu.schedule.sfedurasp, PID: 17448 java.lang.IllegalStateException: Could not execute method for android:onClick at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293) at android.view.View.performClick(View.java:5647) at android.view.View$PerformClick.run(View.java:22462) at android.os.Handler.handleCallback(Handler.java:754) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:163) at android.app.ActivityThread.main(ActivityThread.java:6221) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invoke(Native Method) at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) at android.view.View.performClick(View.java:5647) at android.view.View$PerformClick.run(View.java:22462) at android.os.Handler.handleCallback(Handler.java:754) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:163) at android.app.ActivityThread.main(ActivityThread.java:6221) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794) Caused by: java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.widget.RelativeLayout$LayoutParams at com.sfedu.schedule.sfedurasp.Main.OnClick(Main.java:19) at java.lang.reflect.Method.invoke(Native Method) at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) at android.view.View.performClick(View.java:5647) at android.view.View$PerformClick.run(View.java:22462) at android.os.Handler.handleCallback(Handler.java:754) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:163) at android.app.ActivityThread.main(ActivityThread.java:6221) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)

    1 answer 1

    Everything is written in the error:

     Caused by: java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.widget.RelativeLayout$LayoutParams

    you have a RelativeLayout in LinearLayout. Change:

     RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) relativeLayout.getLayoutParams();

    On:

     LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) relativeLayout.getLayoutParams();