在android本机应用程序的本机文件中为java方法定义返回值

Question

In define findclass and getmethodid in Android native app, I have an method that returns a value of Uri.

below is my native code:

void Java_com_example_myapp_MainActivity_callnative(JNIEnv* env, jobject obj){
    jclass handlerClass = (*env)->FindClass(env, "com/example/myapp/myclass");
     jmethodID parsemethod = (*env)->GetMethodID(env, handlerClass, "methodname", "(Ljava/lang/String;)Landroid/net/Uri"); 

}

MainActivity code:

public class MainActivity extends ActionBarActivity {
    private static String LIB_NAME = "nativelib";

    static {
        System.loadLibrary(LIB_NAME);
    }
     
    public native void callnative();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        callnative();
    }
}

and myclass code which has a method(show) and Native code will call this method:

   public class myclass {
        
         public Uri show(Uri Uri)
         {
             Log.v("called from native", "calling from native side");
            return Uri.parse("content://this/string");
         }  
    }

I get this error: Java.lang.NoSuchMethodError: no method with name ="methodname" signature=' (Ljava/lang/String;) Landroid/net/Uri' in class Lcom/example/myapp/myclass;

suppose this is for Define Return value, for return value like Void we set Only V, but I do not have any idea about Uri.

How can I fix this?

Answer 1

您可能正在从java static方法调用本机方法，只需从MainActivity删除关键字static