android应用学习---7.jni回调java

1. jni回调java成功一次之后也很简单的。（以hello-jni为原型修改）

2. HelloJni.java 中的代码

public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        TextView  tv = new TextView(this);
        tv.setText( stringFromJNI() );
        setContentView(tv);

        nativeCallBack();
    }

    public void callback_func(int notify_id, int param)
    {
        Log.i("JNICallback","notify_id="+notify_id+";param="+param);
    }
    public native void nativeCallBack();

3.  hello-jni.c中的代码

void Java_com_example_hellojni_HelloJni_nativeCallBack( JNIEnv* env, jobject thiz )
{
    LOGI("jni callback (0)");
    jclass cls = (*env)->GetObjectClass(env, thiz);
    jmethodID cb_method = (*env)->GetMethodID(env, cls,"callback_func","(II)V");
    (*env)->CallVoidMethod(env, thiz,cb_method,5,10);
    LOGI("jni callback (1)");
    return ;
}

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