I have main tabHost layout that its frame content is set on another layout

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Asked: June 7, 20262026-06-07T01:50:55+00:00 2026-06-07T01:50:55+00:00

I have main tabHost layout that its frame content is set on another layout

0

I have main “tabHost” layout that its frame content is set on another layout “content” that contains a webview.
“Tabbar” class sets tabhost layout and “second” class sets its frame content.

Problem is when, from “Tabbar” class I try to set webview height using following code that crashes on params,

WebView webviewA = (WebView) findViewById(R.id.webviewA);     
LayoutParams params = (LayoutParams) webviewA.getLayoutParams();
params.height -= 300;

Already tried to call function of webviewA from Tabbar as,

Tabbar class

second recalcula = new second();
recalcula.recalcula();

second class

public void recalcula (){
    webviewA = (WebView) findViewById(R.id.webviewA);
    LayoutParams params = (LayoutParams) webviewA.getLayoutParams();
    params.height -= 300;
    webviewA.setLayoutParams(params);
}

also crashes on params… what I am doing wrong? Thank you.

logcat error

   07-06 10:14:39.893: E/AndroidRuntime(11023): FATAL EXCEPTION: main
    07-06 10:14:39.893: E/AndroidRuntime(11023): java.lang.NullPointerException
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at com.xxxxx.projecte1.second.recalcula(second.java:70)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at com.xxxxx.projecte1.TabBar.onReceiveAd(TabBar_iOSActivity.java:493)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at com.google.ads.internal.d.B(SourceFile:1116)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at com.google.ads.internal.c$e.run(SourceFile:187)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at android.os.Handler.handleCallback(Handler.java:587)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at android.os.Handler.dispatchMessage(Handler.java:92)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at android.os.Looper.loop(Looper.java:138)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at android.app.ActivityThread.main(ActivityThread.java:3701)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at java.lang.reflect.Method.invokeNative(Native Method)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at java.lang.reflect.Method.invoke(Method.java:507)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
    07-06 10:14:39.893: E/AndroidRuntime(11023):    at dalvik.system.NativeStart.main(Native Method)