爲網頁流量的Android setLayoutParams生成錯誤

Question

是有可能設置

mWebView = (WebView) findViewById(R.id.webviewHelp); 
     mWebView.setLayoutParams(new ViewGroup.LayoutParams(100, 200)); 

這裏

mWebView.setLayoutParams(new Gallery.LayoutParams(70,85)); 

也被測試，但在我的活動不工作:(

？ 我的XML文件如下

（這裏我必須通過XML創建webview是需要的在我的應用程序）

<?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="fill_parent" android:id="@+id/rl" 
     android:layout_height="360dip"> 
    <!-- <WebView android:id="@+id/webviewHelp" android:layout_width="fill_parent"--> 
    <!--  android:layout_height="fill_parent" />--> 
    <WebView android:id="@+id/webviewHelp" android:layout_width="fill_parent" 
      android:layout_height="fill_parent" /> 
     <Button android:id="@+id/My_btn" 
      android:layout_alignParentBottom="true" 
      android:layout_alignParentLeft="true" android:gravity="center" android:textSize="8px" android:text="Download this mp3 file" 
    android:textColor="@color/white" 
      android:layout_width="fill_parent" android:layout_height="33dip" 
      android:visibility="invisible" /> 
     <Button android:id="@+id/My_btn1" 
      android:layout_alignParentBottom="true" 
      android:layout_alignParentLeft="true" android:text="this is button !" 
      android:layout_width="0dip" android:layout_height="0dip" 
      android:visibility="invisible" /> 
    </RelativeLayout> 

，我得到這個錯誤，並申請強制關閉

06-11 15:42:51.816: DEBUG/AndroidRuntime(323): Shutting down VM 
06-11 15:42:51.816: WARN/dalvikvm(323): threadid=3: thread exiting with uncaught exception (group=0x4001aa28) 
06-11 15:42:51.816: ERROR/AndroidRuntime(323): Uncaught handler: thread main exiting due to uncaught exception 
06-11 15:42:51.835: ERROR/AndroidRuntime(323): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.RelativeLayout$DependencyGraph.findRoots(RelativeLayout.java:1291) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.RelativeLayout$DependencyGraph.getSortedViews(RelativeLayout.java:1238) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.RelativeLayout.sortChildren(RelativeLayout.java:279) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:299) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.View.measure(View.java:7703) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:2989) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.View.measure(View.java:7703) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:2989) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.View.measure(View.java:7703) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:2989) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.View.measure(View.java:7703) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:569) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:361) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.View.measure(View.java:7703) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:2989) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.View.measure(View.java:7703) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:2989) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.View.measure(View.java:7703) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:464) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:278) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.View.measure(View.java:7703) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:2989) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.View.measure(View.java:7703) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.ViewRoot.performTraversals(ViewRoot.java:747) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1613) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.os.Handler.dispatchMessage(Handler.java:99) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.os.Looper.loop(Looper.java:123) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at android.app.ActivityThread.main(ActivityThread.java:4203) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at java.lang.reflect.Method.invoke(Method.java:521) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 
06-11 15:42:51.835: ERROR/AndroidRuntime(323):  at dalvik.system.NativeStart.main(Native Method) 
06-11 15:42:51.845: INFO/Process(52): Sending signal. PID: 323 SIG: 3 
06-11 15:42:51.845: INFO/dalvikvm(323): threadid=7: reacting to signal 3 
06-11 15:42:51.857: ERROR/dalvikvm(323): Unable to open stack trace file '/data/anr/traces.txt': Permission denied 
06-11 15:42:52.566: DEBUG/dalvikvm(99): GC freed 4505 objects/251696 bytes in 293ms 

什麼是錯的我在做什麼？在此先感謝：Pragna

Answer 1

取而代之的是：

mWebView = (WebView) findViewById(R.id.webviewHelp);  
    mWebView.setLayoutParams(new ViewGroup.LayoutParams(100, 200)); 

使用：

mWebView = (WebView) findViewById(R.id.webviewHelp);   
    LayoutParamters lp = mWebView.getLayoutParams();  
    lp.width=100; 
    lp.height=200; 
    mWebView.setLayoutParams(lp);