初始化WebView。
mWebView = root.findViewById(R.id.web_view);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.addJavascriptInterface(new JsBridge(), "javaObjectA");
JsBridge.java
被JavaScript调用的方法要加上@JavascriptInterface
public class JsBridge {
@JavascriptInterface
public void javaMethod(int value) {
System.out.println("java method: " + value);
}
}
Java调用JavaScript
Java代码
mWebView.loadUrl("javascript:window.javaObjectA.javaMethod(100);");
JavaScript调用Java
JavaScript代码
window.javaObjectA.javaMethod(100);
WebView方法说明
WebView.addJavascriptInterface解释
/**
* Injects the supplied Java object into this WebView. The object is
* injected into the JavaScript context of the main frame, using the
* supplied name. This allows the Java object's methods to be
* accessed from JavaScript.
* @param object the Java object to inject into this WebView's JavaScript
* context. Null values are ignored.
* @param name the name used to expose the object in JavaScript
*/
public void addJavascriptInterface(Object object, String name) {
checkThread();
mProvider.addJavascriptInterface(object, name);
}
addJavascriptInterface(Object object, String name)。
第一个参数是被注入到WebView中的java对象，JavaScript可以操作该对象有@JavascriptInterface的public方法。
第二个参数是java 类暴露给JavaScript的名字。mWebView.addJavascriptInterface(new JsBridge(), "javaObjectA");将new 出来的JsBridge对象注入到了WebView中，并命名为了JavaObjectA。JavaScript可以通过window.javaObjectA.javaMethod(100);调用该java对象的javaMethod()方法。
