Android的JavascriptInterface问题 [英] Android JavascriptInterface problem
问题描述
我是一个Android的初学者。我想在活动网页视图JavaScript调用JavaScript的接口类来改变一个TextView值。有一个web视图,并在活动布局一个TextView。
I am an Android beginner. I am trying to change a textview value in an activity in a webview javascript call to javascript interface class. There is a webview and a textview in the activity layout.
MyWebActivity
public class MyWebActivity extends Activity {
...
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String url = "http://myurl...";
webview = (WebView) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
webview.setWebChromeClient(new WebChromeClient());
webview.loadUrl(url);
webview.addJavascriptInterface(new JsInterface(this), "Android");
}
...
}
JsInterface.java
public class JsInterface {
...
public void setUIText()
{
TextView textView1 = (TextView) ((Activity) mContext).findViewById(R.id.textView1);
/*This line not work*/
textView1.setText("Hello");
/*This line work*/
Toast.makeText(mContext, textView1.getText(), Toast.LENGTH_SHORT).show();
}
}
HTML文件
Android.setUIText();
接着的问题是,当我叫 Android.setUIText()
在HTML文件中,它触发JsInterface的setUIText,我不能设置为<$ C文本$ C> textView1 ,但我可以用得到textView1的文字的getText()
。
Then problem is, when I call Android.setUIText()
in the html file, it trigger the JsInterface's setUIText, and I cannot set the text for the textView1
, but I can get the textView1's text using getText()
.
什么原因?我怎样才能解决这个问题?
What's the reason? How can I fix it?
推荐答案
就在添加这些行您的 setUIText 功能
Just add these lines in your setUIText Function
public void setUIText()
{
final String msgeToast = toast + newToast;
myHandler.post(new Runnable() {
@Override
public void run() {
// This gets executed on the UI thread so it can safely modify Views
myTextView.setText(msgeToast);
}
});
Toast.makeText(mContext, textView1.getText(), Toast.LENGTH_SHORT).show();
}
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