Android串口通信UnsatisfiedLinkError和libserial_port.so: has text relocations异常

一，异常

1，使用Google串口调试开源库App，调试串口出现以下异常：

2，AndroidStudio的logcat打印报错信息：UnsatisfiedLinkError: dlopen failed: /data/app/com.smart.vendor.serialport.library-1/lib/arm/libserial_port.so: has text relocations

二，解决办法：

在Android.mk文件中加入： LOCAL_LDFLAGS += -fPIC，重新编译Google开源库的源码，生成.so库

#
# Copyright 2009 Cedric Priscal
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
# http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. 
#

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

TARGET_PLATFORM := android-3
LOCAL_MODULE    := serial_port
LOCAL_SRC_FILES := SerialPort.c
LOCAL_LDLIBS    := -llog

#加入如下信息
LOCAL_LDFLAGS += -fPIC

include $(BUILD_SHARED_LIBRARY)

重新编译好的.so库

第二种解决办法：

module下的build.gradle 把targetSdkVersion 改为22以下（也就是Android 6.0以下版本）；在Android 6.0之前，text reloactions的问题，会在编译的过程中，作为warning报出来；在Android 6.0以上版本，原来的warning被升级为error了。因此，同样的库文件，在Android 6.0前的环境运行，不报错；6.0及以上版本就会crash掉。

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