class JsObject {
@JavascriptInterface
public String toString() { return "injectedObject"; }
}
webView.addJavascriptInterface(new JsObject(), "injectedObject");
webView.loadData("", "text/html", null);
webView.loadUrl("javascript:alert(injectedObject.toString())");
注意上面加粗的@JavascriptInterface一定要添加。
另外，要是有混淆编译时候，别忘记加上下面：
-keep public class com.yourfullpackagename.Yourapp$JavaScriptInterface
-keepclassmembers class com.yourfullpackagename.Yourapp$JavaScriptInterface {*;}
-keepattributes com.yourfullpackagename.Yourapp$JavaScriptInterface
-keepattributes *Annotation*
android 4.2对于addJavascriptInterface，有了安全限制
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转载自gouxychina.iteye.com/blog/2048074
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