从源码编译Android系统的Java类库和JNI动态库的方法

  ├── Android.mk
  └── src
   └── com
     └── lhw
       └── framework
         └── led
           └── Led.java

package com.lhw.framework.led; 
 
/** 
 * LED操作库 
 * @author Micky Liu 
 */ 
public class Led { 
   
  public boolean turnOn() { 
    return true; 
  }   
   
  public boolean turnOff() { 
    return true; 
  }   
} 

LOCAL_PATH := $(call my-dir) 
 
LOCAL_SRC_FILES   := $(call all-java-files-under, src) 
LOCAL_MODULE    := framework_led 
LOCAL_MODULE_TAGS  := framework_led 
 
LOCAL_JAVA_LIBRARIES    := 
LOCAL_STATIC_JAVA_LIBRARIES := 
 
include $(BUILD_JAVA_LIBRARY) 

   mmm /home/administrator/workspace/android_test/framework_led

   Install: out/target/product/generic/system/framework/framework_led.jar    

├── jni
│  ├── Android.mk
│  └── led.c

#include  
#include  
 
jboolean Java_com_lhw_led_Led_turnOn(JNIEnv *env, jclass thiz) 
{ 
  return JNI_TRUE; 
} 
 
jboolean Java_com_lhw_led_LED_trunOff(JNIEnv *env, jclass thiz) 
{ 
  return JNI_TRUE; 
} 

LOCAL_PATH := $(call my-dir) 
 
LOCAL_SRC_FILES := led.c 
LOCAL_MODULE  := led_jni 
LOCAL_MODULE_TAGS    := led_jni 
 
LOCAL_PRELINK_MODULE  := false 
LOCAL_SHARED_LIBRARIES := libc 
 
include $(BUILD_SHARED_LIBRARY) 

  mmm /home/administrator/workspace/android_test/jni

  Install: out/target/product/generic/system/lib/led_jni.so