要是webview能够与JavaScript交互，首先需要webview要启用JavaScript：
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WebSettings webSettings = myWebView.getSettings();
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webSettings.setJavaScriptEnabled(true);
然后创建JavaScript的接口：
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public class WebAppInterface {
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Context mContext;
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WebAppInterface(Context c) {
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mContext = c;
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}
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@JavascriptInterface
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public void showToast(String toast) {
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Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
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}
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}
给webview添加JavaScript接口：
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myWebView.addJavascriptInterface(new WebAppInterface(this), "Android");
本地JavaScript文件：
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<input type="button" value="Say hello" onClick="showAndroidToast(‘Hello Android!‘)" />
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<script type="text/javascript">
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function showAndroidToast(toast) {
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Android.showToast(toast);
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}
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</script>
整个代码如下：
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public class MainActivity extends Activity {
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private WebView myWebView;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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myWebView = (WebView) findViewById(R.id.webview);
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WebSettings webSettings = myWebView.getSettings();
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webSettings.setJavaScriptEnabled(true);
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myWebView.addJavascriptInterface(new WebAppInterface(this), "Android");
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ProcessWebString();
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}
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public class WebAppInterface {
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Context mContext;
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WebAppInterface(Context c) {
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mContext = c;
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}
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@JavascriptInterface
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public void showToast(String toast) {
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Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
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}
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}
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private void ProcessWebString() {
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String tpl = getFromAssets("web_tpl.html");
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myWebView.loadDataWithBaseURL(null, tpl, "text/html", "utf-8", null);
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}
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public String getFromAssets(String fileName) {
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try {
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InputStreamReader inputReader = new InputStreamReader(
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getResources().getAssets().open(fileName));
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BufferedReader bufReader = new BufferedReader(inputReader);
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String line = "";
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String Result = "";
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while ((line = bufReader.readLine()) != null)
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Result += line;
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return Result;
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} catch (Exception e) {
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e.printStackTrace();
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}
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return "";
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}
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}
这里获取到的是assert文件下的html字符串，写了一个方法获取assert文件下html
还有种方法可以直接load
webView.loadUrl("file:///android_asset/html/company.html");
assets文件下的html文件下的company.html文件
webView.setWebChromeClient(new MyWebClient());
private class MyWebClient extends WebChromeClient {
@Override
public boolean onJsAlert(WebView view, String url, String message,
JsResult result) {
// TODO Auto-generated method stub
Intent intent = null;
if (message.contains("tid")) {
Pattern pattern = Pattern.compile("tid=(\\d+)");
Matcher matcher = pattern.matcher(message);
String tid = "";
while (matcher.find()) {
String st = matcher.group(0);
tid = st.split("=")[1];
System.out.println("---" + tid);
}
intent = new Intent(BbsMyHomeActivity.this,
BbsHomeDetailTestActivity.class);
intent.putExtra("tid", tid);
} else {
intent = new Intent(BbsMyHomeActivity.this,
MyAttentionDetailActivity.class);
intent.putExtra("uid", message);
}
startActivity(intent);
// new CustomeToast(BbsMyHomeActivity.this, message);
new PopupToast(BbsMyHomeActivity.this, message, footlayout);
// 少写了这行代码可能会导致，点击了一次js里的alert弹出方法，无法点击第二次。
result.cancel();
return true;
}
}
http://blog.csdn.net/ithomer/article/details/8737999
做项目的时候还发现一个问题，就是WebView的addJavascriptInterface方法失效的问题
里面的类的方法名上面要加annotation
@JavascriptInterface
表忘了导包import
android.webkit.JavascriptInterface;
Android项目中的assert文件下的html里的js交互,布布扣,bubuko.com
Android项目中的assert文件下的html里的js交互
原文：http://blog.csdn.net/fancylovejava/article/details/21961251
