AI 149005: Change from ndk to platform's ndk (pndk), the ability to make your own java callable libraries to c code.

BUG=1857858

Automated import of CL 149005

pdk/pndk/samples/samplejni/native.cpp

@@ -0,0 +1,85 @@
+#include <jni.h>
+#include <stdio.h>
+
+static jint
+add(JNIEnv *env, jobject thiz, jint a, jint b) {
+int result = a + b;
+    printf("%d + %d = %d", a, b, result);
+    return result;
+}
+
+static const char *classPathName = "com/example/jniexample/Native";
+
+static JNINativeMethod methods[] = {
+  {"add", "(II)I", (void*)add },
+};
+
+/*
+ * Register several native methods for one class.
+ */
+static int registerNativeMethods(JNIEnv* env, const char* className,
+    JNINativeMethod* gMethods, int numMethods)
+{
+    jclass clazz;
+
+    clazz = env->FindClass(className);
+    if (clazz == NULL) {
+        fprintf(stderr, "Native registration unable to find class '%s'", className);
+        return JNI_FALSE;
+    }
+    if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
+        fprintf(stderr, "RegisterNatives failed for '%s'", className);
+        return JNI_FALSE;
+    }
+
+    return JNI_TRUE;
+}
+
+/*
+ * Register native methods for all classes we know about.
+ */
+static int registerNatives(JNIEnv* env)
+{
+  if (!registerNativeMethods(env, classPathName,
+                 methods, sizeof(methods) / sizeof(methods[0]))) {
+    return JNI_FALSE;
+  }
+
+  return JNI_TRUE;
+}
+
+/*
+ * Set some test stuff up.
+ *
+ * Returns the JNI version on success, -1 on failure.
+ */
+
+typedef union {
+    JNIEnv* env;
+    void* venv;
+} UnionJNIEnvToVoid;
+
+jint JNI_OnLoad(JavaVM* vm, void* reserved)
+{
+    UnionJNIEnvToVoid uenv;
+    uenv.venv = NULL;
+    jint result = -1;
+    JNIEnv* env = NULL;
+    
+    printf("JNI_OnLoad");
+
+    if (vm->GetEnv(&uenv.venv, JNI_VERSION_1_4) != JNI_OK) {
+        fprintf(stderr, "GetEnv failed");
+        goto bail;
+    }
+    env = uenv.env;
+
+    if (!registerNatives(env)) {
+        fprintf(stderr, "registerNatives failed");
+    }
+    
+    result = JNI_VERSION_1_4;
+    
+bail:
+    return result;
+}