自定义相机预览在Android 4.1中不起作用？
我在安卓系统中创建了自定义的摄像头视图。但当我打开摄像头片段时，不是摄像头预览是黑屏，而是安卓2.3.0工作，但安卓4.1及以上版本不工作。我的代码在下面 我的TakeCameraFragment代码如下：自定义相机预览在Android 4.1中不起作用？,android,camera,preview,Android,Camera,Preview,我在安卓系统中创建了自定义的摄像头视图。但当我打开摄像头片段时，不是摄像头预览是黑屏，而是安卓2.3.0工作，但安卓4.1及以上版本不工作。我的代码在下面 我的TakeCameraFragment代码如下： public class TakeCameraFragment extends Fragment { Camera mCamera ; CameraPreview mCameraPreview; protected static final int MEDIA_
public class TakeCameraFragment extends Fragment {
Camera mCamera ;
CameraPreview mCameraPreview;
protected static final int MEDIA_TYPE_IMAGE = 0;
static String FilePAth = "";
Button takePicture;
static String base64string = "";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.camerafragment,
container, false);
mCamera = getCameraInstance();
Log.v("log_tag", "mCamera :: " + mCamera);
mCameraPreview = new CameraPreview(getActivity(), mCamera);
FrameLayout preview = (FrameLayout) rootView
.findViewById(R.id.camera_preview_fragment);
preview.addView(mCameraPreview);
takePicture = (Button) rootView
.findViewById(R.id.btnTakePicturefragment);
takePicture.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mCamera.takePicture(null, null, mPictureframent);
}
});
return rootView;
}
public boolean checkCameraHardware(Context context) {
if (context.getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA)) {
// this device has a camera
return true;
} else {
// no camera on this device
return false;
}
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
releaseCamera();
}
private void releaseCamera() {
if (mCamera != null) {
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}
private Camera getCameraInstance() {
Camera mCamera = null;
try {
mCamera = Camera.open();
} catch (Exception e) {
// cannot get camera or does not exist
releaseCamera();
}
return mCamera;
}
private static File getOutputMediaFile() {
File mediaStorageDir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"MyCameraAppFragment");
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
FilePAth = mediaStorageDir.getPath() + File.separator + "IMG_fragment_"
+ timeStamp + ".jpg";
File mediaFile;
mediaFile = new File(mediaStorageDir.getPath() + File.separator
+ "IMG_fragment_" + timeStamp + ".jpg");
return mediaFile;
}
PictureCallback mPictureframent = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFile = getOutputMediaFile();
if (pictureFile == null) {
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
FragmentManager fm = getFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
SetPictureImageFragment fm2 = new SetPictureImageFragment();
fragmentTransaction.replace(R.id.relative_camerafragment_id,
fm2, "HELLO");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
Bundle bundle = new Bundle();
bundle.putByteArray("position", data);
fm2.setArguments(bundle);
mCamera.startPreview();
} catch (FileNotFoundException e) {
} catch (IOException e) {
}
}
};
}
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mSurfaceHolder;
private Camera mCamera;
Boolean isPreviewRunning = true;
// Constructor that obtains context and camera
public CameraPreview(Context context, Camera camera) {
super(context);
mCamera = camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mSurfaceHolder = getHolder();
mSurfaceHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
/*try {
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
//mCamera.setDisplayOrientation(90);
} catch (IOException e) {
// left blank for now
}*/
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
//mCamera.stopPreview();
// mCamera.release();
if (mCamera != null)
{
mCamera.stopPreview();
mCamera.release();
}
}
/*@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int format,
int width, int height) {
// start preview with new settings
try {
mCamera.stopPreview();
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
//mCamera.setDisplayOrientation(90);
} catch (Exception e) {
// intentionally left blank for a test
}
}*/
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// If your preview can change or rotate, take care of those events here.
// Make sure to stop the preview before resizing or reformatting it.
if (mSurfaceHolder.getSurface() == null){
// preview surface does not exist
return;
}
// stop preview before making changes
if(isPreviewRunning)
{
mCamera.stopPreview();
}
Parameters parameters = mCamera.getParameters();
WindowManager windo = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
Display display = windo.getDefaultDisplay();
if(display.getRotation() == Surface.ROTATION_0)
{
parameters.setPreviewSize(h,w);
mCamera.setDisplayOrientation(90);
}
if(display.getRotation() == Surface.ROTATION_90)
{
parameters.setPreviewSize(w, h);
}
if(display.getRotation() == Surface.ROTATION_180)
{
parameters.setPreviewSize(h, w);
// mCamera.setDisplayOrientation(270);
}
if(display.getRotation() == Surface.ROTATION_270)
{
parameters.setPreviewSize(w, h);
mCamera.setDisplayOrientation(180);
}
// set preview size and make any resize, rotate or
// reformatting changes here
// start preview with new settings
// mCamera.setParameters(parameters);
try {
mCamera.setPreviewDisplay(mSurfaceHolder);
mCamera.startPreview();
isPreviewRunning = true;
} catch (Exception e){
Log.d("log", "Error starting camera preview: " + e.getMessage());
}
}
@Override
protected void onMeasure(int widthSpec, int heightSpec) {
int previewWidth = MeasureSpec.getSize(widthSpec);
int previewHeight = MeasureSpec.getSize(heightSpec);
//Get the padding of the border background
int hPadding = getPaddingLeft() + getPaddingRight();
int vPadding = getPaddingTop() + getPaddingBottom();
//Resize the preview frame with correct aspect ratio
previewWidth += hPadding;
previewHeight -= vPadding;
//Add the padding of the border.
previewWidth += hPadding;
previewHeight += vPadding;
//Ask children to follow the new preview dimension
super.onMeasure(MeasureSpec.makeMeasureSpec(previewWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(previewHeight, MeasureSpec.EXACTLY));
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relative_camerafragment_id"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:color/white"
android:descendantFocusability="blocksDescendants"
>
<FrameLayout
android:id="@+id/camera_preview_fragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:layout_below="@+id/conform" >
</FrameLayout>
<Button
android:id="@+id/btnTakePicturefragment"
android:layout_width="60dip"
android:layout_height="60dip"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="18dp"
android:background="@drawable/camera" />
</RelativeLayout>
您应该编写mCamera.startPreview（）；添加此行后，它将工作