Android java傳遞int類型數組給C

接著前面的文章《Android java傳遞int類型數據給C》《Android java傳遞string類型數據給C》，繼續實踐

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

項目佈局

<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="傳遞int類型參數" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="passString"
        android:text="傳遞String類型參數" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="passIntArray"
        android:text="傳遞Int類型數組" />

</LinearLayout>

實現arrElementsIncrease函數

/*
 * 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;

 }

MainActivity.java中添加下麵的代碼：

    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 + "");
        }
    }

獲取更多C相關知識，關註公眾號：“csuanfa”