问题
I am getting exception while setting the layoutparams of scroolview programmatically.I have tried but getting exception while doing that.This is the code:
sv = (ScrollView)findViewById(R.id.scrollView);
sv.setBackgroundColor(Color.TRANSPARENT);
ScrollView.LayoutParams layoutParams = new ScrollView.LayoutParams(
ScrollView.LayoutParams.MATCH_PARENT,
ScrollView.LayoutParams.MATCH_PARENT);
layoutParams.bottomMargin = 100;
layoutParams.setMargins(0, 0, 0, 100);
sv.setLayoutParams(layoutParams);
This is the error log:
09-23 12:13:20.666: E/AndroidRuntime(3284): Uncaught handler: thread main exiting due to uncaught exception
09-23 12:13:20.696: E/AndroidRuntime(3284): java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.RelativeLayout$DependencyGraph.findRoots(RelativeLayout.java:1291)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.RelativeLayout$DependencyGraph.getSortedViews(RelativeLayout.java:1238)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.RelativeLayout.sortChildren(RelativeLayout.java:279)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:299)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.View.measure(View.java:7964)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:569)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:361)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.View.measure(View.java:7964)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3023)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.View.measure(View.java:7964)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.LinearLayout.measureVertical(LinearLayout.java:464)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.LinearLayout.onMeasure(LinearLayout.java:278)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.View.measure(View.java:7964)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3023)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.View.measure(View.java:7964)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3023)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.View.measure(View.java:7964)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.ViewRoot.performTraversals(ViewRoot.java:763)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.view.ViewRoot.handleMessage(ViewRoot.java:1633)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.os.Handler.dispatchMessage(Handler.java:99)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.os.Looper.loop(Looper.java:123)
09-23 12:13:20.696: E/AndroidRuntime(3284): at android.app.ActivityThread.main(ActivityThread.java:4363)
09-23 12:13:20.696: E/AndroidRuntime(3284): at java.lang.reflect.Method.invokeNative(Native Method)
09-23 12:13:20.696: E/AndroidRuntime(3284): at java.lang.reflect.Method.invoke(Method.java:521)
09-23 12:13:20.696: E/AndroidRuntime(3284): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
09-23 12:13:20.696: E/AndroidRuntime(3284): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
09-23 12:13:20.696: E/AndroidRuntime(3284): at dalvik.system.NativeStart.main(Native Method)
This is the xml file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerHorizontal="true"
android:orientation="vertical" >
<RelativeLayout
android:id="@+id/frameLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ScrollView
android:id="@+id/scrollView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="90.0dip"
android:layout_marginLeft="1.0dip"
android:layout_marginRight="1.0dip"
android:layout_marginTop="-2.0dip"
android:animateLayoutChanges="true"
android:fadeScrollbars="true"
android:fadingEdge="none" >
<!-- android:layout_marginBottom="60.0dip" -->
<!-- android:fillViewport="true" -->
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="visible" >
<ImageView
android:id="@+id/QuestionImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="visible" />
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/QuestionImageView"
android:fadingEdge="vertical"
android:scrollbars="vertical" />
<TextView
android:id="@+id/questionnumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:fadingEdge="vertical"
android:scrollbars="vertical" />
<TextView
android:id="@+id/question"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@id/tv"
android:fadingEdge="vertical"
android:padding="10dp"
android:scrollbars="vertical"
android:text=""
android:textColor="@color/dark_green" />
<RadioGroup
android:id="@+id/radioGroup1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/question"
android:orientation="vertical" >
<RadioButton
android:id="@+id/option1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="" />
<ImageView
android:layout_width="fill_parent"
android:layout_height="1.0dp"
android:background="@drawable/thinnest_blue_gradient" />
<RadioButton
android:id="@+id/option2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="" />
<ImageView
android:layout_width="fill_parent"
android:layout_height="1.0dp"
android:background="@drawable/thinnest_blue_gradient" />
<RadioButton
android:id="@+id/option3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="" />
<ImageView
android:layout_width="fill_parent"
android:layout_height="1.0dp"
android:background="@drawable/thinnest_blue_gradient" />
<RadioButton
android:id="@+id/option4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="" />
</RadioGroup>
</RelativeLayout>
</ScrollView>
</RelativeLayout>
<RelativeLayout
android:id="@+id/relativequestion"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" >
<com.google.ads.AdView
android:id="@+id/ad"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="a1501e5633125fb"
ads:loadAdOnCreate="true"
ads:testDevices="TEST_EMULATOR, 123456789ABCDEF" />
<LinearLayout
android:id="@+id/newquestion"
android:layout_width="fill_parent"
android:layout_height="40.0dip"
android:layout_above="@id/ad"
android:background="#ff777777"
android:orientation="horizontal" >
<Button
android:id="@+id/PrevButton"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:layout_marginLeft="5.0dip"
android:layout_weight="1.0"
android:background="@drawable/ibtn"
android:onClick="onPrevButtonClick"
android:text="Prev" />
<Button
android:id="@+id/NextButton"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:layout_marginLeft="5.0dip"
android:layout_weight="1.0"
android:background="@drawable/ibtn"
android:onClick="onNextButtonClick"
android:text="Next" />
<Button
android:id="@+id/SkipButton"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:layout_marginLeft="5.0dip"
android:layout_weight="1.0"
android:background="@drawable/ibtn"
android:onClick="onSkipButtonClick"
android:text="Skip" >
</Button>
<Button
android:id="@+id/SubmitButton"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:layout_marginLeft="5.0dip"
android:layout_marginRight="5.0dp"
android:layout_weight="1.0"
android:background="@drawable/ibtn"
android:onClick="onSubmitButtonClick"
android:text="Submit" />
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
Please help me.Thanks in advance.
回答1:
The parent of your ScrollView is a RelativeLayout and for this you should use RelativeLayout.LayoutParams:
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) sv
.getLayoutParams();
lp.setMargins(0, 0, 0, 100);
来源：https://stackoverflow.com/questions/12550325/getting-exception-while-setting-layoutparams-of-scrollview-programmatically