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    <p>Yes, you can use the same JNI signature in many applications. Your class may not belong to the default package of the application, as defined in AndroidManifest.xml. So what? <hr /> <strong>Example:</strong></p> <p>Start with HelloJni sample from NDK (in Eclipse, use Import -> Android -> existing Android Code, and point to the ${android-ndk-root}/samples/hello-jni).</p> <p>Build it and run on device or emulator.</p> <p>Open a new Android Application project, call it TestCrossJni. The package name for our app will be: test.cross.jni - no relation to <code>com.example.hellojni</code>!</p> <p>Choose "Create Activity" -> create Blank Activity.</p> <p>Add new Java class to this project (<code>src/com/example/hellojni/HelloJni.java</code>): </p> <pre><code>package com.example.hellojni; public class HelloJni { public static String gets() { return stringFromJNI(); } /* A native method that is implemented by the * 'hello-jni' native library, which is packaged * with this application. */ private native String stringFromJNI(); /* this is used to load the 'hello-jni' library on application * startup. The library has already been unpacked into * /data/data/com.example.hellojni/lib/libhello-jni.so at * installation time by the package manager. */ static { System.load("/data/data/com.example.hellojni/lib/libhello-jni.so"); } } </code></pre> <p>Edit <code>res/layout/activity_main.xml</code>: replace </p> <p>&nbsp;&nbsp;&nbsp;&nbsp;line 12 <code>android:text="@string/hello_world" /&gt;</code></p> <p>&nbsp;&nbsp;&nbsp;&nbsp;with <code>android:id="@+id/hello_world" /&gt;</code></p> <p>In <code>src/test/cross/jni/MainActivity.java</code>, add the following after </p> <p>&nbsp;&nbsp;&nbsp;&nbsp;line 12 <code>setContentView(R.layout.activity_main);</code></p> <pre><code>((android.widget.TextView)findViewById(R.id.hello_world)).setText(com.example.hellojni.HelloJni.gets()); </code></pre> <p>Profit!</p>
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    1. POOpportunity to using native methods systemwide. How to call method or how it should be named?
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    1. COHow to add a class in the AndroidManifest.xml and how it should be called in Main_activity?
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    2. CONo, only activities and services must be declared in AndroidManifest.xml. Access to com.mp5package.mp5 from any Java class in your project is very similar to how it uses com.android.Activity class or com.java.nio.ByteBuffer
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    3. COSounds easy but how it look like in code? I never used ByteBuffer or so and not familiar with java.
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