Android問題集錦轉載之三 · Android問題集錦

## Javah 常見錯誤記錄-NDK與JNI除錯測試文件：hello-jni/src/com/example/hellojni/HelloJni.java ~~~ /**? ?*?該文件來自?Android?NDK?Sample?-?HelloJni，?為了便于說明問題，我作了一些修改。? ?*/?? package?com.example.hellojni;?? ?? public?class?HelloJni?? {?? ????public?native?String??stringFromJNI();?? ?? ????public?native?String??unimplementedStringFromJNI();?? ?? ????static?{?? ????????System.loadLibrary("hello-jni");?? ????}?? }?? ~~~ 錯誤一 ~~~ david@xmomx:hellojni$?javac?HelloJni.java??? david@xmomx:hellojni$?ls?? Hello.class??Hello.h??Hello.java??HelloJni.class??HelloJni.java?? david@xmomx:hellojni$?javah?-jni?HelloJni?? error:?cannot?access?HelloJni?? bad?class?file:?./HelloJni.class?? class?file?contains?wrong?class:?com.example.hellojni.HelloJni?? Please?remove?or?make?sure?it?appears?in?the?correct?subdirectory?of?the?classpath.?? com.sun.tools.javac.util.Abort?? ????at?com.sun.tools.javac.comp.Check.completionError(Check.java:164)?? ????at?com.sun.tools.javadoc.DocEnv.loadClass(DocEnv.java:149)?? ????at?com.sun.tools.javadoc.RootDocImpl.(RootDocImpl.java:77)?? ????at?com.sun.tools.javadoc.JavadocTool.getRootDocImpl(JavadocTool.java:159)?? ????at?com.sun.tools.javadoc.Start.parseAndExecute(Start.java:330)?? ????at?com.sun.tools.javadoc.Start.begin(Start.java:128)?? ????at?com.sun.tools.javadoc.Main.execute(Main.java:66)?? ????at?com.sun.tools.javah.Main.main(Main.java:147)?? javadoc:?error?-?fatal?error?? 2?errors?? ~~~ 錯誤原因，沒有在正確的路徑下執行 javah 命令，應該在源碼根目錄下執行。錯誤二: ~~~ david@xmomx:hellojni$?cd?../../../?? david@xmomx:src$?ls?? com?? david@xmomx:src$?javah?-jni?HelloJni?? error:?cannot?access?HelloJni?? class?file?for?HelloJni?not?found?? javadoc:?error?-?Class?HelloJni?not?found.?? Error:?No?classes?were?specified?on?the?command?line.??Try?-help.?? ~~~ 錯誤原因：Classes 參數要使用完整類名，也就是說要加上包名錯誤四： ~~~ david@xmomx:src$?javah?-jni?com/example/hellojni/HelloJni?? javadoc:?error?-?Illegal?package?name:?"com/example/hellojni/HelloJni"?? 1?error?? ~~~ 錯誤原因：完整類名格式錯誤 ~~~ david@xmomx:src$?javah?-jni?com.example.hellojni.HelloJni?? ~~~ OK，編譯通過。如果還有錯誤，說是類找不到還是什么的，請嘗試添加 -classpath . 參數。如下： ~~~ david@xmomx:src$?javah?-jni?-classpath?.?com.example.hellojni.HelloJni ? ~~~