当我在模拟器中运行我的Android应用时,我遇到了一个无法连接到相机服务的异常。我已经阅读了各种现有帖子,但都没有解决这个问题。显然是Camera.open()调用失败了。我最终想要在模拟器中使用网络摄像头,因为许多SO帖子都讨论了这个问题,但现在只想让应用程序不出错运行。我不关心是否显示任何相机视频,因为除了相机以外还有其他需要测试的功能,并且主要还是在我的设备上测试相机。
我的清单似乎没问题。它包含以下行:
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
在我的AVD管理器中,我已将前置和后置摄像头均设置为“模拟”,SD卡的值为64。这些似乎是推荐值。完整的堆栈跟踪现在如下所示。解决方案必须是直截了当的,但是该怎么做呢?10-09 08:14:32.375 2628-2628/com.allinlearning.AILAndroidScanner E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.allinlearning.AILAndroidScanner, PID: 2628
java.lang.RuntimeException: Fail to connect to camera service
at android.hardware.Camera.native_setup(Native Method)
at android.hardware.Camera.<init>(Camera.java:350)
at android.hardware.Camera.open(Camera.java:309)
at com.allinlearning.AILAndroidScanner.AsynCamPreview.surfaceCreated(AsynCamPreview.java:104)
at android.view.SurfaceView.updateWindow(SurfaceView.java:572)
at android.view.SurfaceView.access$000(SurfaceView.java:86)
at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:175)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:847)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1871)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:544)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
整个类的代码如下所示。再次提醒,会抛出异常的是 Camera.open() 调用:import java.io.IOException;
import java.util.List;
import android.graphics.Bitmap;
import android.graphics.ImageFormat;
import android.hardware.Camera;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.view.SurfaceHolder;
import android.webkit.MimeTypeMap;
import android.widget.ImageView;
public class AsynCamPreview extends MainActivity
implements SurfaceHolder.Callback, Camera.PreviewCallback
{
private Camera mCamera;
public Camera.Parameters params;
private SurfaceHolder sHolder;
private ImageView myCameraPreview = null;
private Bitmap mBitmap = null;
// data arrays
private int[] pixels = null;
private float[] floatpixels = null;
private byte[] FrameData = null;
// Camera params
public float maxZoom;
private int imageFormat;
private int previewSizeWidth;
private int previewSizeHeight;
private int camId = 1;
// flags and counts
private boolean bProcessing = false;
private int frameCount = 0;
private boolean doProcessing = false;
public boolean mProcessInProgress = false;
public static final String TAG = "AsynCamPreview";
private long mTiming[] = new long[50];
private int mTimingSlot = 0;
Handler mHandler = new Handler(Looper.getMainLooper());
static {
// System.loadLibrary("ImageProcessing");
Log.i(TAG, "Native library loaded");
}
public AsynCamPreview(int previewLayoutWidth, int previewLayoutHeight, ImageView cameraPreview)
{
previewSizeWidth = previewLayoutWidth;
previewSizeHeight = previewLayoutHeight;
myCameraPreview =cameraPreview;
}
@Override
public void onPreviewFrame(byte[] data, Camera camera)
{
// Do nothing for now
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
sHolder = holder;
if (camId == 0) {
mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
}
else {
mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
}
try {
mCamera.setPreviewDisplay(holder);
mCamera.setPreviewCallback(this);
} catch (IOException e) {
mCamera.release();
mCamera= null;
}
params = mCamera.getParameters();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
params = mCamera.getParameters();
List<Camera.Size> sizes = params.getSupportedPictureSizes();
this.params.setPreviewSize(previewSizeWidth, previewSizeHeight);
mBitmap = Bitmap.createBitmap(previewSizeWidth, previewSizeHeight,
Bitmap.Config.ARGB_8888);
myCameraPreview.setImageBitmap(mBitmap);
pixels = new int[previewSizeWidth * previewSizeHeight];
//floatpixels = new float[previewSizeWidth * previewSizeHeight * 3];
imageFormat = params.getPreviewFormat();
mCamera.setParameters(params);
mCamera.startPreview();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
@Override
public void onPause() {
this.mCamera.stopPreview();
}
}