way*_*bai 5 javascript android webview
我使用Android WebView加载一个简单的HTML页面.HTML取决于一小段Javascript代码.
我需要在加载html之前注入Javascript.所以我这样做:
public class MainActivity extends Activity {
WebView mWebView;
Button mButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mWebView = (WebView)findViewById(R.id.webview);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.setWebChromeClient(new WebChromeClient(){
@Override
public boolean onJsAlert(WebView view, String url, String message,JsResult result) {
return super.onJsAlert(view, url, message, result);
}
});
mButton = (Button)findViewById(R.id.button);
mButton.setOnClickListener(new myListener());
}
class myListener implements OnClickListener{
int mCount = 1;
@Override
public void onClick(View arg0) {
System.out.println("Load test page=>"+mCount+" times");
mWebView.loadUrl("javascript:var output='This string is defined before html loaded.'");
mWebView.loadUrl("file:///android_asset/test.html");
mCount++;
}
}
}
HTML代码:
<html>
<head>
<script>
alert(output);
</script>
<head>
<body>
</body>
</html>
当我第一次单击按钮时,JS和HTML工作正常.但是,当我单击按钮再次执行加载时,它失败了.
日志:
Load test page=>1 times
Load test page=>2 times
Uncaught ReferenceError: output is not defined at file:///android_asset/test.html:5
Load test page=>3 times
Uncaught ReferenceError: output is not defined at file:///android_asset/test.html:5
有什么建议吗？
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