java - preloading a webview and then switching to its activity -


im new android , java programming. im trying get splash screen load on startup , in background load webview located on different activity , once webview page ready want switch activity 1 webview

package com.example.troyalert;   import android.app.activity;  import android.os.asynctask;  import android.os.bundle;  import android.view.menu;  import android.webkit.websettings;  import android.webkit.webview;  import android.webkit.webviewclient;  public class mainactivity extends activity {  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_splash);     new downloadwebpagetask().execute(); }  private class downloadwebpagetask extends asynctask<void, void, void> {      @override     protected void doinbackground(void... arg0) {         webview mywebview = (webview) findviewbyid(r.id.webview);         websettings websettings = mywebview.getsettings();         websettings.setjavascriptenabled(true);         mywebview.loadurl("http://enigmamaster.com/raul/locator3/");         mywebview.setwebviewclient(new webviewclient(){          @override          public void onpagefinished(webview view, string url){             setcontentview(r.layout.activity_main);         }         });         return null;     }  }    @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main, menu);     return true; }  }

the app crashes on doinbackground() im pretty sure cause not seeing webview view on splash screen. how can make work once page in webview loaded switches activity_main layout. reason wanting dont want people presented white screen while waiting page load in it

05-13 14:34:37.174: e/trace(1070): error opening trace file: no such file or directory (2)  05-13 14:34:37.814: w/dalvikvm(1070): threadid=11: thread exiting uncaught exception (group=0x40a13300)  05-13 14:34:37.894: d/gralloc_goldfish(1070): emulator without gpu emulation detected.  05-13 14:34:38.474: e/androidruntime(1070): fatal exception: asynctask #1  05-13 14:34:38.474: e/androidruntime(1070): java.lang.runtimeexception: error occured while executing doinbackground()  05-13 14:34:38.474: e/androidruntime(1070):     @ android.os.asynctask$3.done(asynctask.java:299)  05-13 14:34:38.474: e/androidruntime(1070):     @ java.util.concurrent.futuretask$sync.innersetexception(futuretask.java:273)  05-13 14:34:38.474: e/androidruntime(1070):     @ java.util.concurrent.futuretask.setexception(futuretask.java:124)  05-13 14:34:38.474: e/androidruntime(1070):     @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:307)  05-13 14:34:38.474: e/androidruntime(1070):     @ java.util.concurrent.futuretask.run(futuretask.java:137)  05-13 14:34:38.474: e/androidruntime(1070):     @ android.os.asynctask$serialexecutor$1.run(asynctask.java:230)  05-13 14:34:38.474: e/androidruntime(1070):     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1076)  05-13 14:34:38.474: e/androidruntime(1070):     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:569)  05-13 14:34:38.474: e/androidruntime(1070):     @ java.lang.thread.run(thread.java:856)  05-13 14:34:38.474: e/androidruntime(1070): caused by: java.lang.nullpointerexception  05-13 14:34:38.474: e/androidruntime(1070):     @ com.example.troyalert.mainactivity$downloadwebpagetask.doinbackground(mainactivity.java:24)  05-13 14:34:38.474: e/androidruntime(1070):     @ com.example.troyalert.mainactivity$downloadwebpagetask.doinbackground(mainactivity.java:1)  05-13 14:34:38.474: e/androidruntime(1070):     @ android.os.asynctask$2.call(asynctask.java:287)  05-13 14:34:38.474: e/androidruntime(1070):     @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:305)  05-13 14:34:38.474: e/androidruntime(1070):     ... 5 more  05-13 14:39:38.700: i/process(1070): sending signal. pid: 1070 sig: 9

try :

private webview mywebview; private websettings websettings;  @override protected void oncreate(bundle savedinstancestate) {    super.oncreate(savedinstancestate);    setcontentview(r.layout.activity_splash);    mywebview = (webview) findviewbyid(r.id.webview);    websettings = mywebview.getsettings();    websettings.setjavascriptenabled(true);    new downloadwebpagetask().execute();    mywebview.setwebviewclient(new webviewclient(){        @override        public void onpagefinished(webview view, string url){           setcontentview(r.layout.activity_main);       }       }); }  private class downloadwebpagetask extends asynctask<void, void, void> {     @override    protected void doinbackground(void... arg0) {        mywebview.loadurl("http://enigmamaster.com/raul/locator3/");         return null;    } }

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