我在我的应用程序中打开前置摄像头。在第一次运行应用程序运行正常，但当我再次运行应用程序第2次，第3次或第4次时，它给了我异常java.lang.RuntimeException : set display orientation failed。
请帮助。
public class MirrorView extends SurfaceView implements
SurfaceHolder.Callback
{
private static SurfaceHolder mHolder;
private static Camera mCamera;
private int zoom;
private boolean freeze, hide = false;
private final static String DEBUG_TAG = "MirrorView";
public static final int MEDIA_TYPE_IMAGE = 1;
public MirrorView(Context context, Camera camera)
{
super(context);
mCamera = camera;
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder)
{
try
{
mCamera.stopPreview();
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
Log.v(DEBUG_TAG, "Surface Created");
}
catch (Exception error)
{
Log.d("Debug",
"Error starting mPreviewLayout: " + error.getMessage());
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height)
{
Log.v(DEBUG_TAG, "Surface changed");
if (mHolder.getSurface() == null)
{
Log.v(DEBUG_TAG, "Holder is null");
return;
}
// can't make changes while mPreviewLayout is active
try
{
mCamera.stopPreview();
Log.v(DEBUG_TAG, "Preview Stopped");
}
catch (Exception e)
{
e.printStackTrace();
}
Display display = Main.getDisplay();
Camera.Parameters parameters = mCamera.getParameters();
if(display.getRotation() == Surface.ROTATION_0)
{
Log.v(DEBUG_TAG, "orientation set to 90");
parameters.setPreviewSize(height, width);
mCamera.setDisplayOrientation(90);
}
if(display.getRotation() == Surface.ROTATION_90)
{
parameters.setPreviewSize(width, height);
}
if(display.getRotation() == Surface.ROTATION_180)
{
parameters.setPreviewSize(height, width);
}
if(display.getRotation() == Surface.ROTATION_270)
{
Log.v(DEBUG_TAG, "orientation set to 180");
parameters.setPreviewSize(width, height);
mCamera.setDisplayOrientation(180);
}
try
{
// start up the mPreviewLayout
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
}
catch (Exception error)
{
Log.d("Debug",
"Error starting mPreviewLayout: " + error.getMessage());
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if(event.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN)
{
if(hide)
{
Main.ShowViews();
hide = false;
}
else
{
Main.HideShow();
hide = true;
}
}
return true;
}
/*private PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFile = null; //getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null)
{
Log.d(DEBUG_TAG, "Error creating media file, check storage permissions: " +
"");
return;
}
try {
// FileOutputStream fos = new FileOutputStream(pictureFile);
// fos.write(data);
// fos.close();
} catch (FileNotFoundException e) {
Log.d(DEBUG_TAG, "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d(DEBUG_TAG, "Error accessing file: " + e.getMessage());
}
}
};*/
public void ZoomIn()
{
Camera.Parameters p = mCamera.getParameters();
int maxZoom = p.getMaxZoom();
if (p.isZoomSupported())
{
if (zoom < maxZoom)
{
zoom += 10;
}
p.setZoom(zoom);
}
mCamera.setParameters(p);
try
{
mCamera.setPreviewDisplay(mHolder);
}
catch (Exception e)
{
e.printStackTrace();
}
mCamera.startPreview();
}
public void ZoomOut()
{
Camera.Parameters p = mCamera.getParameters();
if (p.isZoomSupported())
{
if (zoom > 0)
{
zoom -= 10;
}
p.setZoom(zoom);
}
mCamera.setParameters(p);
try
{
mCamera.setPreviewDisplay(mHolder);
}
catch (Exception e)
{
e.printStackTrace();
}
mCamera.startPreview();
}
public void freezeMirror()
{
if(freeze)
{
try
{
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
freeze = false;
}
else
{
// mCamera.takePicture(null, null, mPicture);
mCamera.stopPreview();
mCamera.startPreview();
freeze = true;
}
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
if(mCamera != null)
{
//mCamera.stopPreview();
mCamera.release();
}
}
}
我有主要课程，这是我的laucher活动
public class Main extends Activity
{
private Camera mCam;
private MirrorView mCamPreview;
private int mCameraId = 0;
private FrameLayout mPreviewLayout;
private static ImageView zoomin, zoomout, freeze;
private static Display display;
private static File picfile;
private static final String DEBUG_TAG = "Main";
public static final int MEDIA_TYPE_IMAGE = 1;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mCameraId = findFirstFrontFacingCamera();
mPreviewLayout = (FrameLayout) findViewById(R.id.camPreview);
zoomin = (ImageView) findViewById(R.id.zoomin);
zoomout = (ImageView) findViewById(R.id.zoomout);
// freeze = (ImageView) findViewById(R.id.freeze);
mPreviewLayout.removeAllViews();
display = ((WindowManager)getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
// picfile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
setListeners();
startCameraInLayout(mPreviewLayout, mCameraId);
}
public static void ShowViews()
{
zoomin.setVisibility(View.VISIBLE);
zoomout.setVisibility(View.VISIBLE);
//freeze.setVisibility(View.VISIBLE);
}
public static void HideShow()
{
zoomin.setVisibility(View.INVISIBLE);
zoomout.setVisibility(View.INVISIBLE);
//freeze.setVisibility(View.INVISIBLE);
}
public static Display getDisplay()
{
return display;
}
public void setListeners()
{
zoomin.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub
mCamPreview.ZoomIn();
}
});
zoomout.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub
mCamPreview.ZoomOut();
}
});
/* freeze.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub
mCamPreview.freezeMirror();
}
});*/
}
@Override
protected void onPause()
{
super.onPause();
Log.v(DEBUG_TAG, "Pause");
freeCamera();
}
public void freeCamera()
{
if (mCam != null)
{
mCam.release();
mCam = null;
}
}
private int findFirstFrontFacingCamera()
{
int foundId = -1;
int numCams = Camera.getNumberOfCameras();
for (int camId = 0; camId < numCams; camId++)
{
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(camId, info);
if (info.facing == CameraInfo.CAMERA_FACING_FRONT)
{
foundId = camId;
break;
}
}
return foundId;
}
private void startCameraInLayout(FrameLayout layout, int cameraId)
{
mCam = Camera.open(cameraId);
if (mCam != null)
{
mCamPreview = new MirrorView(this, mCam);
// setCameraDisplayOrientationAndSize();
layout.addView(mCamPreview);
}
}
}
日志文件：
11-28 11:05:23.729: E/AndroidRuntime(23827): FATAL EXCEPTION: main
11-28 11:05:23.729: E/AndroidRuntime(23827): java.lang.RuntimeException: set display orientation failed
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.hardware.Camera.setDisplayOrientation(Native Method)
11-28 11:05:23.729: E/AndroidRuntime(23827): at com.gsmappstabs.mirror.MirrorView.surfaceChanged(MirrorView.java:83)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.SurfaceView.updateWindow(SurfaceView.java:558)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.SurfaceView.dispatchDraw(SurfaceView.java:350)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.drawChild(ViewGroup.java:1649)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.drawChild(ViewGroup.java:1649)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.drawChild(ViewGroup.java:1649)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.View.draw(View.java:6923)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.drawChild(ViewGroup.java:1651)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.drawChild(ViewGroup.java:1649)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.View.draw(View.java:6923)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-28 11:05:23.729: E/AndroidRuntime(23827): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1869)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewRoot.draw(ViewRoot.java:1540)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewRoot.performTraversals(ViewRoot.java:1276)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewRoot.handleMessage(ViewRoot.java:1880)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.os.Handler.dispatchMessage(Handler.java:99)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.os.Looper.loop(Looper.java:130)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.app.ActivityThread.main(ActivityThread.java:3701)
11-28 11:05:23.729: E/AndroidRuntime(23827): at java.lang.reflect.Method.invokeNative(Native Method)
11-28 11:05:23.729: E/AndroidRuntime(23827): at java.lang.reflect.Method.invoke(Method.java:507)
11-28 11:05:23.729: E/AndroidRuntime(23827): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:895)
11-28 11:05:23.729: E/AndroidRuntime(23827): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:653)
11-28 11:05:23.729: E/AndroidRuntime(23827): at dalvik.system.NativeStart.main(Native Method)
11-28 11:05:23.729: E/AndroidRuntime(23827): [Blue Error Handler] Make Debugging Report file for main
11-28 11:05:23.729: E/AndroidRuntime(23827): java.lang.RuntimeException: set display orientation failed
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.hardware.Camera.setDisplayOrientation(Native Method)
11-28 11:05:23.729: E/AndroidRuntime(23827): at com.gsmappstabs.mirror.MirrorView.surfaceChanged(MirrorView.java:83)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.SurfaceView.updateWindow(SurfaceView.java:558)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.SurfaceView.dispatchDraw(SurfaceView.java:350)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.drawChild(ViewGroup.java:1649)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.drawChild(ViewGroup.java:1649)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.drawChild(ViewGroup.java:1649)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.View.draw(View.java:6923)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.drawChild(ViewGroup.java:1651)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.drawChild(ViewGroup.java:1649)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.View.draw(View.java:6923)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-28 11:05:23.729: E/AndroidRuntime(23827): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1869)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewRoot.draw(ViewRoot.java:1540)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewRoot.performTraversals(ViewRoot.java:1276)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.view.ViewRoot.handleMessage(ViewRoot.java:1880)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.os.Handler.dispatchMessage(Handler.java:99)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.os.Looper.loop(Looper.java:130)
11-28 11:05:23.729: E/AndroidRuntime(23827): at android.app.ActivityThread.main(ActivityThread.java:3701)
11-28 11:05:23.729: E/AndroidRuntime(23827): at java.lang.reflect.Method.invokeNative(Native Method)
11-28 11:05:23.729: E/AndroidRuntime(23827): at java.lang.reflect.Method.invoke(Method.java:507)
11-28 11:05:23.729: E/AndroidRuntime(23827): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:895)
11-28 11:05:23.729: E/AndroidRuntime(23827): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:653)
11-28 11:05:23.729: E/AndroidRuntime(23827): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：8)
在设置显示方向前调用stopPreview()，然后在设置显示方向后调用startPreview()。
mCamera.stopPreview();
mCamera.setDisplayOrientation(90);
mCamera.startPreview();
答案 1 :(得分：0)
尽管这是一个古老的问题，但其他问题也可能有解决方案。但是，这是我的解决方案，可供以后参考，
确保停止预览并在活动暂停时释放相机。
@Override
protected void onPause()
{
super.onPause();
Log.v(DEBUG_TAG, "Pause");
mCam.stopPreview();
mCam.release();
}