Question

I create an android project(TestJni) in the android source path /packages/apps/ without eclipse. I had compiled the android source code.

I had added the jni folder . Under the jni folder, there are some files ,including Android.mk and basic.c .

Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := basic.c
LOCAL_MODULE := testjni
include $(BUILD_SHARED_LIBRARY)

basic.c

#include<string.h>
#include<jni.h>
jstring Java_com_example_FristJniActivity_getStringFromJni(JNIEnv *env, jobject thiz) {
    return (*env)->NewStringUTF(env, "hello ndk and jni");
}

root of current android Project, there is a Android.mk
Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := $(call all-java-files-under, src)
LOCAL_PACKAGE_NAME := TestJni
LOCAL_JNI_SHARD_LIBRARIES := testjni
LOCAL_REQUIRED_MODULES := testjni
include $(BUILD_PACKAGE)

in src folder,there is a activity(FristJniActivity)
FristJniActivity.java

static {
    System.loadLirary("testjni");
}
public native String getStringFromJni();

public void onCreate(Bundle b) {
    super.onCreate(b);
    TextView tv = new TextView(this);
    tv.setText(getStringFromJNi());
    setContentView(tv);
}

Then I compile the TestJni app, and the apk can be found.But after I push it into the handset, force close .

The error is :
java.lang.unsatisfiedlinkerror:couldn’t load testjni: findLibrary returned null

I googled . But I can’t find the solution.

I had checked the apk file, the testjni.so file is already exist in the /lib/armeabi-v7a/ directory.

Answer 1

I modify some values

jni/Android.mk

LOCAL_MODULE := libtestjni

Android.mk

LOCAL_JNI_SHARD_LIBRARIES := libtestjni
LOCAL_REQUIRED_MODULES := libtestjni

, and use the command “adb install *.apk “.

Then it works well.