相关疑难解决方法(0)

我正在尝试将PJSIP库用于我的Android应用程序.我根据本手册构建了pjsua示例应用程序:https://trac.pjsip.org/repos/wiki/Getting-Started/Android

但是,当示例应用程序启动时,异常触发器:

12-06 15:03:58.043: D/dalvikvm(628): Trying to load lib /data/data/org.pjsip.pjsua2.app/lib/libpjsua2.so 0x4129d980
12-06 15:03:58.064: W/dalvikvm(628): Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lorg/pjsip/pjsua2/app/MyApp;
12-06 15:03:58.064: D/AndroidRuntime(628): Shutting down VM
12-06 15:03:58.064: W/dalvikvm(628): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
12-06 15:03:58.083: E/AndroidRuntime(628): FATAL EXCEPTION: main
12-06 15:03:58.083: E/AndroidRuntime(628): java.lang.ExceptionInInitializerError
12-06 15:03:58.083: E/AndroidRuntime(628):  at org.pjsip.pjsua2.app.MainActivity.onCreate(MainActivity.java:85)
12-06 15:03:58.083: E/AndroidRuntime(628):  at android.app.Activity.performCreate(Activity.java:4465)
12-06 15:03:58.083: E/AndroidRuntime(628):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
12-06 15:03:58.083: E/AndroidRuntime(628):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
12-06 15:03:58.083: E/AndroidRuntime(628):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
12-06 15:03:58.083: E/AndroidRuntime(628):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
12-06 15:03:58.083: …

我是Android NDK的新手.我需要使用NDK将Lame库添加到Android Studio.我开始研究并找到一些有用的链接:

Lame MP3 Encoder编译为Android

如何将"跛脚"mp3编码器共享对象链接到Android工作室项目

我成功但只建立了"armeabi".我怎样才能构建另一个像:"arm64-v8a","armeabi-v7a","mips","mips64","x86","x86_64"？

先感谢您!

我在http://androidxref.com/4.0.4/xref/bionic/libc/string/bcopy.c中阅读了memcpy实现, 发现以下代码很难理解,有人可以解释一下吗？

 36 /*
 37  * sizeof(word) MUST BE A POWER OF TWO
 38  * SO THAT wmask BELOW IS ALL ONES
 39  */
 40 typedef long word;      /* "word" used for optimal copy speed */
 41 
 42 #define wsize   sizeof(word)
 43 #define wmask   (wsize - 1)
 44 

...

        /*
 78          * Copy forward.
 79          */
 80         t = (long)src;  /* only need low bits */
 81         if ((t | (long)dst) & wmask) {
 82             /*
 83              * …