基本思路：用www下載伺服器上的apk儲存於persistentPath,然後呼叫android方法安裝apk完成更新。
1.下載apk

IEnumerator InstallApk()
    {
        WWW www = new WWW(url);
//下載需要更新的apk
        while (true)
        {
            Debug.Log(www.progress / 1f * 100);
            if (www.isDone)
            {
                break;
            }
            yield return null;
        }


        if (!string.IsNullOrEmpty(www.error))
        {
            Debug.Log("error:" + www.error);
            yield return 0 ;
        }

        try
        {
        //將apk寫入沙盒目錄
            string path = Application.persistentDataPath + "/test.apk";
            File.WriteAllBytes(path, www.bytes);
            using(AndroidJavaClass cl = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
            {
                using(AndroidJavaObject ob = cl.GetStatic<AndroidJavaObject>("currentActivity"))
                {
                //然後呼叫android來安裝apk
                    ob.Call("InstallApk", path);
                }
            }
        }
        catch (System.Exception e)
        {
            Debug.Log(e);
        }

    }
 

2.安裝apk （java程式碼）

public void InstallApk(String path)
    {
    	Log.d("----------", path);
    	
    	url = path; 
    	Log.d("url:", url);
    	Intent intent = new Intent(Intent.ACTION_VIEW); 
    	intent.setDataAndType(Uri.fromFile(new File(path)), "application/vnd.android.package-archive"); 
    	startActivity(intent); 
    }
 

3.開啟apk

public void openApk(Context context) {
    	Log.d("OpenApkUrl:" ,url);
        PackageManager manager = context.getPackageManager();
        // 這裡的是你下載好的檔案路徑
        PackageInfo info = manager.getPackageArchiveInfo(url, PackageManager.GET_ACTIVITIES);
        if (info != null) {
            Intent intent = manager.getLaunchIntentForPackage(info.applicationInfo.packageName);
            startActivity(intent);
        }
    }
 

這段程式碼有點異議,原思路是監聽apk安裝完畢後呼叫該方法,但android似乎不支援自監聽,就是說廣播接收者(監聽用)所在的apk被銷燬後無法監聽到自己被銷燬。