Android java transmits an array of the int type to C and androidint.

Android java transmits an array of the int type to C and androidint.

Next we will continue to use the previous article "Android java transfers int type data to C" and Android java transfers string type data to C ".

Implement public native int [] arrElementsIncrease (int [] intArray );

Project Layout

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: tools = "http://schemas.android.com/tools" android: layout_width = "match_parent" android: layout_height = "match_parent" android: orientation = "vertical" tools: context = ". mainActivity "> <Button android: layout_width =" wrap_content "android: layout_height =" wrap_content "android: onClick =" click "android: text = "passing int type parameters"/> <Button android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: onClick = "passString" android: text = "passing String type parameters"/> <Button android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: onClick = "passIntArray" android: text = "passing an array of Int type"/> </LinearLayout>

Implement the arrElementsIncrease Function

/* * Class:     com_wuyudong_javapassdata_JNI * Method:    arrElementsIncrease * Signature: ([I)[I */JNIEXPORT jintArray JNICALL Java_com_wuyudong_javapassdata_JNI_arrElementsIncrease(        JNIEnv * env, jobject clazz, jintArray jArray){      jsize len = (*env)->GetArrayLength(env, jArray);     // jboolean iscopy;      int* arrayPointer = (*env)->GetIntArrayElements(env, jArray, NULL);      int i;      for(i = 0; i < len; i++){          *(arrayPointer + i) += 10;      }      return jArray; }

Add the following code to MainActivity. java:

    public void passIntArray(View v) {        int[] array = new int[] { 1, 2, 3, 4, 5 };        int[] newArray = jni.arrElementsIncrease(array);        for (int i : newArray) {            Log.d("test", i + "");        }    }

Get more C-related knowledge and follow the public account: "csuanfa"