UnityでAndroidのBluetooth制御＆Twitter4J連携：Unityで楽々スマホ用3Dアプリ開発入門（3）（3/3 ページ）

using UnityEngine;
using System .Collections;
using System .Runtime.InteropServices;
using System ;
 
public class CallJavaCode : MonoBehaviour {
    private IntPtr TwitterSampleActivityClass; // ［1］
    private int ptr_getScreenName; // ［2］
    private int ptr_auth; // ［3］
    private int ptr_updateStatus; // ［4］
    private string announceString;
 
    void Start (){
        // attach our thread to the java vm; obviously the main thread is already attached but this is good practice..
        JavaVM.AttachCurrentThread();
        //Get TwitterSampleActivityClass Pointer // ［5］
        IntPtr cls_Activity = JNI.FindClass("com/example/twittersample/TwitterSampleActivity");
        Debug.Log ("cls_Activity = " + cls_Activity);
        int fid_Activity = JNI.GetStaticFieldID(cls_Activity, "twitterSampleActivity_", "Lcom/example/twittersample/TwitterSampleActivity;");
        IntPtr obj_Activity = JNI.GetStaticObjectField(cls_Activity, fid_Activity);
        TwitterSampleActivityClass = JNI.NewGlobalRef(obj_Activity);
        ptr_auth = JNI.GetMethodID(cls_Activity, "auth", "()V"); // ［6］
        ptr_getScreenName = JNI.GetMethodID(cls_Activity, "getScreenName", "()Ljava/lang/String;"); // ［7］
        ptr_updateStatus = JNI.GetMethodID(cls_Activity, "updateStatus", "(Ljava/lang/String;)V"); // ［8］
        announceString = "";
    }
    private void auth(){ // ［9］
        JNI.CallVoidMethod(TwitterSampleActivityClass, ptr_auth);
    }
    private string getScreenName(){ // ［10］
        IntPtr str_GetScreenName = JNI.CallObjectMethod(TwitterSampleActivityClass, ptr_getScreenName);
        Debug.Log ("str_GetScreenName = " + str_GetScreenName);
        IntPtr stringPtr = JNI.GetStringUTFChars(str_GetScreenName, 0);
        Debug.Log ("stringPtr = " + stringPtr);
        String screenName = Marshal.PtrToStringAnsi(stringPtr);
        JNI.ReleaseStringUTFChars(str_GetScreenName, stringPtr);
        Debug.Log ("return value is = " + screenName);
        return screenName;
    }
    private void updateStatus(string message){ // ［11］
        IntPtr encMessage = JNI.NewStringUTF(message);
        JNI.CallObjectMethod(TwitterSampleActivityClass, ptr_updateStatus,encMessage);
    }
    void OnGUI (){
        resetButton();
        if(makeButton("Auth Request")){
            auth();
            announceString = "auth completed";
        }
        if(makeButton("get ScreenName")){
            announceString = "screenname: " + getScreenName();
        }
        if(makeButton("twit Hello")){
            string message = "Hello from Unity";
            announceString = "twitmsg: " + message;
            updateStatus(message);
        }
        showMessage(announceString);
    }
    int buttonX = 0;
    int buttonY = 0;
    void resetButton(){
        buttonX = 0;
        buttonY = 0;
    }
    void showMessage(string message){
        int labelW = 400;
        int labelH = 50;
        GUI.Label(new Rect(10,80,labelW,labelH), message);
    }
    bool makeButton(string label){
        int buttonW = 150;
        int buttonH = 50;
        int buttonsInRow = 2;
        bool b = GUI.Button(new Rect(10+buttonX*(buttonW+5), 150+buttonY*(buttonH+5), buttonW, buttonH), label);
        buttonX++;
        if(buttonX==buttonsInRow){
            buttonX = 0;
            buttonY++;
        }
        return b;
    }
    void _log(string logstring){
        Debug.Log (logstring);
    }
}