Question

我尝试使用ndk运行Android应用程序，我可以构建库，但是当我运行时给出异常。

按照代码和错误获取解决方案的帮助

我使用c代码，而不是cpp

primitive.c

#include <jni.h>
#include <android/log.h>

JNIEXPORT jboolean JNICALL Java_cookbook_chapter2_PassingPrimitiveActivity_passBooleanReturnBoolean(JNIEnv *pEnv, jobject pObj, jboolean pBooleanP){
__android_log_print(ANDROID_LOG_INFO, "native", "%d in %d bytes", pBooleanP, sizeof(jboolean));
return (!pBooleanP);}

Acitivity class：PassingPrimitiveActivity.java

public class PassingPrimitiveActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_passing_primitive);

    StringBuilder strBuilder = new StringBuilder();
    strBuilder.append("boolean: ").append(passBooleanReturnBoolean(false))");;
    TextView tv = (TextView) findViewById(R.id.display_res);
    tv.setText(strBuilder.toString());

}

private native boolean passBooleanReturnBoolean(boolean p);
static {
    System.loadLibrary("PassingPrimitive");
} }

logcat文件，有错误。表明没有实现，但在c代码中，有它

06-11 17:08:30.652 29603 29603 E AndroidRuntime: FATAL EXCEPTION: main

06-11 17:08:30.652 29603 29603 E AndroidRuntime: java.lang.UnsatisfiedLinkError: Native method not found: cookbook.chapter2.passingprimitive.PassingPrimitiveActivity.passBooleanReturnBoolean:(Z)Z

06-11 17:08:30.652 29603 29603 E AndroidRuntime:    at cookbook.chapter2.passingprimitive.PassingPrimitiveActivity.passBooleanReturnBoolean(Native Method)

06-11 17:08:30.652 29603 29603 E AndroidRuntime:    at cookbook.chapter2.passingprimitive.PassingPrimitiveActivity.onCreate(PassingPrimitiveActivity.java:15)

06-11 17:08:30.652 29603 29603 E AndroidRuntime:    at android.app.Activity.performCreate(Activity.java:5184)

我的Android.mk喜欢它：

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := PassingPrimitive
LOCAL_SRC_FILES := primitive.c
LOCAL_LDLIBS := -llog
include $(BUILD_SHARED_LIBRARY)

一切编译好，创建.so文件并复制到我项目下的libs文件夹，但是当我运行时，logcat显示UnsatisfiedLinkError和应用程序崩溃

我可以做些什么来解决它？

Answer 1

尝试从已编译的java代码生成适当的C头文件，如下所示：

javah -jni -classpath bin/classes com.whatever.PassingPrimitiveActivity

然后在您的C代码中包含该头文件。您在C中定义的函数应与头文件中的函数匹配。映射并不总是你所假设的。

Answer 2

您的logcat建议本机函数名称应为

Java_cookbook_chapter2_passingprimitive_PassingPrimitiveActivity_passBooleanReturnBoolean

Android App崩溃并显示UnsatisfiedLinkError

2 个答案: