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    <blockquote> <p>I'm able to instantiate the class by the following statements:</p> </blockquote> <pre class="lang-cs prettyprint-override"><code>Java.Lang.Object jclassWrp_; IntPtr JavaScriptInterface_Class = JNIEnv.FindClass("mypackage.JavaScriptInterface"); </code></pre> <p>JNI use should use JNI conventions, thus <code>mypackage/JavaScriptInterface</code> (note <code>/</code> instead of <code>.</code>).</p> <pre><code>IntPtr JavaScriptInterface_ctor = JNIEnv.GetMethodID(JavaScriptInterface_Class, "&lt;init&gt;", "()V"); IntPtr jsInterfaceinstance_ = JNIEnv.NewObject(JavaScriptInterface_Class, JavaScriptInterface_ctor); jclassWrp_ = new Java.Lang.Object(jsInterfaceinstance_, JniHandleOwnership.TransferGlobalRef); </code></pre> <p><code>JNIEnv.NewObject()</code> returns a local ref, not a global ref, so you want <code>JniHandleOwnership.TransferLocalRef</code>.</p> <blockquote> <p>But when i try to create the object to access the getSelctd() method:</p> </blockquote> <pre class="lang-cs prettyprint-override"><code>IntPtr ipApid = JNIEnv.GetMethodID(jclassWrp_, "getSelctd", "()Ljava/lang/String;"); </code></pre> <p><code>JNIEnv.GetMethodID()</code> takes a class handle, not an instance. Firstly, the above shouldn't compile (<code>Java.Lang.Object</code> != <code>IntPtr</code>). Secondly, <code>jclassWrp</code> contains a <code>mypackage.JavaScriptInterface</code> instance, not the <code>mypackage.JavaScriptInterface</code> Class instance.</p> <p>Instead, do:</p> <pre class="lang-cs prettyprint-override"><code>IntPtr ipApid = JNIEnv.GetMethodID(JavaScriptInterface_Class, "getSelctd", "()Ljava/lang/String;"); </code></pre> <p>Finally, don't forget to <code>JNIEnv.DeleteGlobalRef(JavaScriptInterface_Class)</code> when you don't need it anymore, otherwise you'll leak the gref.</p> <p>Complete code:</p> <pre class="lang-cs prettyprint-override"><code>// FindClass() returns a gref; must be freed (see below) IntPtr JavaScriptInterface_Class = JNIEnv.FindClass("mypackage/JavaScriptInterface"); // MethodIDs do not need to be freed IntPtr JavaScriptInterface_ctor = JNIEnv.GetMethodID(JavaScriptInterface_Class, "&lt;init&gt;", "()V"); IntPtr JavaScriptInterface_getSelctd = JNIEnv.GetMethodID(JavaScriptInterface_Class, "getSelctd", "()Ljava/lang/String;"); // JNIEnv.NewObject() &amp; JNIEnv.CallObjectMethod() return lrefs; freed below IntPtr lrefInstance = JNIEnv.NewObject(JavaScriptInterface_Class, JavaScriptInterface_ctor); IntPtr lrefSelectd = JNIEnv.CallObjectMethod(jsInterfaceinstance_, ipApid); // JniHandleOwnership.TransferLocalRef causes lrefSelectd to be released for us string selected = JNIEnv.GetString(lrefSelectd, JniHandleOwnership.TransferLocalRef); // Resource cleanup JNIEnv.DeleteLocalRef(lrefInstance); JNIEnv.DeleteGlobalRef(JavaScriptInterface_Class); </code></pre>
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    1. COThank you Jon, it worked fine.
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