Android 4.1.2上的相机是黑色的Unity3D和Vuforia
我工作的公司正在构建一个带有vuforia（版本5.x）和Unity3D（版本5.3.5f1个人）集成的Android应用程序。
在最新的Android设备中，相机打开正常但我们在三星Galaxy S2（4.1.2）等旧设备中遇到问题。 当设备通过vuforia打开相机时，屏幕是黑色的，如果我们尝试拍照，图像显然也是黑色的。
我的活动只是实例化统一播放器，它就像下面的代码：
public class MainActivity extends AppCompatActivity { protected UnityPlayer mUnityPlayer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setFormat(PixelFormat.RGBX_8888); // <--- This makes xperia play happy mUnityPlayer = new UnityPlayer(this); setContentView(mUnityPlayer); mUnityPlayer.requestFocus(); } public void onImageSaved(final String path) { final Intent intent = new Intent(MainActivity.this, CameraPreviewActivity.class); final Bundle bundle = new Bundle(); bundle.putString("IMAGE_PATH", path); intent.putExtras(bundle); startActivity(intent); } public void onImageSavedError(final String message) { UnityPlayer.currentActivity.runOnUiThread(new Runnable() { @Override public void run() { Log.e("Teste", message); } }); } // Quit Unity @Override protected void onDestroy () { mUnityPlayer.quit(); super.onDestroy(); } // Pause Unity @Override protected void onPause() { super.onPause(); mUnityPlayer.pause(); } // Resume Unity @Override protected void onResume() { super.onResume(); mUnityPlayer.resume(); } // This ensures the layout will be correct. @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); mUnityPlayer.configurationChanged(newConfig); } // Notify Unity of the focus change. @Override public void onWindowFocusChanged(boolean hasFocus) { super.onWindowFocusChanged(hasFocus); mUnityPlayer.windowFocusChanged(hasFocus); } // For some reason the multiple keyevent type is not supported by the ndk. // Force event injection by overriding dispatchKeyEvent(). @Override public boolean dispatchKeyEvent(KeyEvent event) { if (event.getAction() == KeyEvent.ACTION_MULTIPLE) return mUnityPlayer.injectEvent(event); return super.dispatchKeyEvent(event); } // Pass any events not handled by (unfocused) views straight to UnityPlayer @Override public boolean onKeyUp(int keyCode, KeyEvent event) { return mUnityPlayer.injectEvent(event); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { return mUnityPlayer.injectEvent(event); } @Override public boolean onTouchEvent(MotionEvent event) { return mUnityPlayer.injectEvent(event); } /*API12*/ public boolean onGenericMotionEvent(MotionEvent event) { return mUnityPlayer.injectEvent(event); } @Override public void onBackPressed() { finish(); } }
vuforia负责打开相机并开始跟踪图像目标，而unity3D将使用动画渲染3D图像并负责拍摄照片。
在统一项目中，我们开发了一个按钮来拍摄照片和一个将图像保存在android目录中的function。 它的脚本是用C＃完成的，其实现如下：
IEnumerator TakeSnapshot() { yield return new WaitForEndOfFrame(); Texture2D snap = new Texture2D(Screen.width,Screen.height); Camera camera = Camera.current; if (rotation != null) { camera.transform.rotation = rotation.Value; } if (position != null) { camera.transform.position = position.Value; } camera.Render(); RenderTexture.active = camera.targetTexture; snap.ReadPixels(new Rect(0,0,Screen.width,Screen.height),0,0); snap.Apply(); RenderTexture.active = null; byte[] bytes = snap.EncodeToJPG(); DestroyObject(snap); string path = Application.persistentDataPath + "/MyAppPath/"; if(!System.IO.Directory.Exists(path)){ System.IO.Directory.CreateDirectory(path); } string filename = fileName(Convert.ToInt32(snap.width), Convert.ToInt32(snap.height)); path = path + filename; System.IO.File.WriteAllBytes(path, bytes); using (var actClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer")) { var jo = actClass.GetStatic("currentActivity"); if (jo == null) { Debug.Log ("jo is null"); } else { jo.Call("onImageSaved", path); } } }
这篇文章的主要目标是尝试理解为什么相机在旧设备中只是黑色，因为它在较新的设备中工作正常。 另外我想强调一下openGL可能不是问题，因为我已经使用sinogen 5.1在旧版设备（如三星Galaxy S2）中测试了应用程序。 正在导出的统一项目的当前openGL版本是openGL2。 提前致谢。
试试这段代码：
public string deviceName; WebCamTexture wct; void Start () { WebCamDevice[] devices = WebCamTexture.devices; deviceName = devices[0].name; wct = new WebCamTexture(deviceName, 400, 300, 12); GetComponent ().material.mainTexture = wct; wct.Play(); }