Android how a call to the start method JS

I added a button, click the button he can perform JS function in onCreate () does not perform in, I want him to start execution

 protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState); 
requestWindowFeature (Window.FEATURE_NO_TITLE); 
setContentView (R.layout.activity_chart_line2_d_06); 
wv = (WebView) findViewById (R.id.webView1); 
wv.getSettings () setJavaScriptEnabled (true);. 
wv.getSettings () setUseWideViewPort (true);. 
wv.getSettings () setSupportZoom (true);. 
wv.getSettings () setBuiltInZoomControls (true);. 
wv.getSettings () setLoadWithOverviewMode (true);. 
wv.requestFocus (); 
wv.loadUrl ("file :/ / / android_asset/line2d_06.html"); 
/ / Wv.loadUrl ("javascript: settitle ()"); 

a (null); 


} 

 
public void a (View view) {
new Thread (new Runnable () {

@ Override 
public void run () {
/ / TODO Auto-generated method stub 
wv.loadUrl ("javascript: settitle ()"); 
} 
}) {

.} Start (); 
} 

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Reply:
a (null); / / findViewById (R.id.button1) performClick ().;
Reply:
No,,,,,
Reply:
Should be finished webview not loaded directly modify html source code it

Reply:
So no sense, I still need to pass data from the background, I think it was not loaded when he finished an error unknow chormium error -6
Reply:
Before I could, using the thread, then deleted, and then forgot to do it again would not be re-