我尝试编写一些 AR 应用程序。现在,我编写了一些代码来显示相机预览并从设备上的传感器(加速计、指南针、GPS 接收器)获取数据。
当我在单独的应用程序中运行代码时(例如相机预览作为一个应用程序和作为第二个应用程序获取 GPS 数据的应用程序),一切正常。但是当我尝试集成这两个模块时 - GPS 停止工作;看起来监听器没有收到任何数据。您是否也遇到过类似的问题?
代码如下所示:
public void onResume()
{
super.onResume();
mLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
1000, 0.0f,
mLocationListener);
}
public void onPause()
{
super.onPause();
mLocationManager.removeUpdates(mLocationListener);
}
private LocationListener mLocationListener = new LocationListener()
{
public void onLocationChanged(Location pLocation) {
double lLatitude = pLocation.getLatitude();
double lLongitude = pLocation.getLongitude();
mGpsTextView.setText ("Longitude" + Double.toString(lLongitude) + " Latitude: " + Double.toString(lLatitude));
}
public void onProviderDisabled(String pProvider) {
mGpsTextView.setText ("Provider disabled");
}
public void onProviderEnabled(String pProvider) {
mGpsTextView.setText ("Provider enabled");
}
public void onStatusChanged(String pProvider, int pStatus, Bundle pExtras) {
switch (pStatus)
{
case LocationProvider.OUT_OF_SERVICE:
mGpsTextView.setText("GPS out of service");
break;
case LocationProvider.TEMPORARILY_UNAVAILABLE:
mGpsTextView.setText("GPS temorarily unawalible");
break;
case LocationProvider.AVAILABLE:
mGpsTextView.setText("GPS avalible");
break;
default:
mGpsTextView.setText("EEE");
}
}
};
我尝试在 onCreate/onPause 中注册/取消注册侦听器,但行为是相同的。
相机预览代码如下所示:
私有 SurfaceHolder.Callback mSurfaceHolderCallback = new SurfaceHolder.Callback()
{
私人相机mCamera;
public void surfaceCreated (SurfaceHolder pSurfaceHolder)
{
stopAndReleaseCamera();
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(pSurfaceHolder);
}
catch (Exception imLazy) {
stopAndReleaseCamera();
imLazy.printStackTrace();
}
}
public void surfaceChanged (SurfaceHolder pSurfaceHolder, int pFormat, int pWidth, int pHeight)
{
Parameters lCameraParams = mCamera.getParameters();
lCameraParams.setPreviewSize (pWidth, pHeight);
mCamera.setParameters (lCameraParams);
mCamera.startPreview();
}
public void surfaceDestroyed (SurfaceHolder pSurfaceHolder)
{
stopAndReleaseCamera();
}
private void stopAndReleaseCamera()
{
if (mCamera != null)
{
try
{
mCamera.stopPreview();
mCamera.release();
}
catch (Exception imLazy)
{
//ignore
imLazy.printStackTrace();
}
mCamera = null;
}
}
};
这是在 onCreate 中注册的:
SurfaceView lSurfaceView = (SurfaceView)findViewById(R.id.CameraSurface);
lSurfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
lSurfaceView.getHolder().setFormat(PixelFormat.TRANSLUCENT);
lSurfaceView.getHolder().addCallback (mSurfaceHolderCallback);
R.id.CameraSurface 在layout.xml 中定义为
SurfaceView android:id="@+id/CameraSurface"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
任何想法有什么问题吗?
该代码在三部不同的手机上进行了测试