NDK :Native method not found

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1.错误：

01-04 14:07:41.276: W/dalvikvm(1672): No implementation found for native Lcom/bubble/hellondk/GetString;.getStr:()Ljava/lang/String;
01-04 14:07:41.307: D/AndroidRuntime(1672): Shutting down VM
01-04 14:07:41.307: W/dalvikvm(1672): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
01-04 14:07:41.376: E/AndroidRuntime(1672): FATAL EXCEPTION: main
01-04 14:07:41.376: E/AndroidRuntime(1672): java.lang.UnsatisfiedLinkError: Native method not found: com.bubble.hellondk.GetString.getStr:()Ljava/lang/String;
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at com.bubble.hellondk.GetString.getStr(Native Method)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at com.bubble.hellondk.MainActivity.onCreate(MainActivity.java:16)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at android.app.Activity.performCreate(Activity.java:5104)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at android.app.ActivityThread.access$600(ActivityThread.java:141)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at android.os.Handler.dispatchMessage(Handler.java:99)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at android.os.Looper.loop(Looper.java:137)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at android.app.ActivityThread.main(ActivityThread.java:5041)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at java.lang.reflect.Method.invokeNative(Native Method)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at java.lang.reflect.Method.invoke(Method.java:511)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-04 14:07:41.376: E/AndroidRuntime(1672): 	at dalvik.system.NativeStart.main(Native Method)

2.原因：未加载相应库

package com.bubble.hellondk;

public class GetString {
    public static native String getStr();
    public native String getString();
    public native int add(int a,int b);
    
    static{
    	System.loadLibrary("HelloNDK");
    }
}