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POHow to create an object with JNI?
 

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  1. POHow to create an object with JNI?
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    <p>I need to implement some functions into an Android application using NDK and thus JNI.</p> <p>Here's the C code, with my concerns, that I wrote:</p> <pre><code>#include &lt;jni.h&gt; #include &lt;stdio.h&gt; jobject Java_com_example_ndktest_NDKTest_ImageRef(JNIEnv* env, jobject obj, jint width, jint height, jbyteArray myArray) { jint i; jobject object; jmethodID constructor; jobject cls; cls = (*env)-&gt;FindClass(env, "com/example/ndktest/NDKTest/Point"); //what should put as the second parameter? Is my try correct, according to what //you can find in .java file? I used this documentation: http://download.oracle.com/javase/6/docs/technotes/guides/jni/spec/functions.html#wp16027 constructor = (*env)-&gt;GetMethodID(env, cls, "&lt;init&gt;", "void(V)"); //http://download.oracle.com/javase/6/docs/technotes/guides/jni/spec/functions.html#wp16660 //Again, is the last parameter ok? object = (*env)-&gt;NewObject(env, cls, constructor, 5, 6); //I want to assign "5" and "6" to point.x and point.y respectively. return object; } </code></pre> <p>My problems are more or less explained inside the code. Maybe also: is the return type of the function (jobject) ok?</p> <p>Now the NDKTest.java:</p> <pre><code>package com.example.ndktest; import android.app.Activity; import android.widget.TextView; import android.os.Bundle; public class NDKTest extends Activity { /** Called when the activity is first created. */ public native Point ImageRef(int width, int height, byte[] myArray); public class Point { Point(int myx, int myy) { x = myx; y = myy; } int x; int y; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView tv = new TextView(this); byte[] anArray = new byte[3]; for (byte i = 0; i &lt; 3; i++) anArray[i] = i; Point point = ImageRef(2, 3, anArray); tv.setText(String.valueOf(point.x)); setContentView(tv); } static { System.loadLibrary("test"); } } </code></pre> <p>When I try to run the code, it doesn't work.</p>
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