camera preview parameters of Nexus one?
Any one please help me to solve my camera preview issue. am using a nexus one am setting the camera parameters to 640,480. but its showing force close error my code is as follows
public class CameraPreview extends Activity {
private Preview mPreview;
public static ProgressDialog pdDetail;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide the window title.
requestWindowFeature(Window.FEATURE_NO_TITLE);
// Create our Preview view and set it as the content of our activity.
mPreview = new Preview(this);
setContentView(mPreview);
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if(mPreview.myIntent!=null){
setResult(android.app.Activity.RESULT_OK,mPreview.myIntent);
finish();
}
return super.onKeyDown(keyCode, event);
}
if (keyCode == KeyEvent.KEYCODE_SPACE ||keyCode == KeyEvent.KEYCODE_CAMERA || keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
mPreview.captureImage();
pdDetail = ProgressDialog.show(this, null , null,true,false);
return true;
}
return false;
}
}
// ----------------------------------------------------------------------
class Preview extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder;
Camera mCamera;
Intent myIntent = null;
Context appContext;
Preview(Context context) {
super(context);
appContext = context;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
开发者_运维问答
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException exception) {
mCamera.release();
mCamera = null;
// Add more exception handling logic here
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
//TODO Fix There is a simple work-around for HERO. In the surfaceChanged method simply swap the
//width and height in setPreviewSize when in portrait mode.
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPictureSize(640,480); //800,300
parameters.setPreviewSize(w, h);
mCamera.setParameters(parameters);
mCamera.startPreview();
}
Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera c) {
myIntent = new Intent();
myIntent.putExtra("bitmapData", true);
Bitmap b = BitmapFactory.decodeByteArray(data, 0, data.length);
saveFile(b);//TODO Unable to Store Image. Problem with SD Card
//mCamera.startPreview();
if(CameraPreview.pdDetail.isShowing()){
CameraPreview.pdDetail.cancel();
//CameraPreview.pdDetail.dismiss();
}
}
};
private boolean saveFile(Bitmap bitmap){
boolean status = false;
try {
String externalStorageState = Environment.getExternalStorageState();
URI uri = null;
//String name = appContext.getFilesDir().getAbsolutePath()+"/"+"camera.jpg";
if(externalStorageState.equalsIgnoreCase("mounted")){
//In SD Card
//uri = URI.create("file://"+Environment.getExternalStorageDirectory()+"/ExpenseTracker/");
//File sddir = new File(uri);
/*File file = new File(uri);
if(!file.exists()){
boolean mkdirs = file.mkdirs();
}*/
uri = URI.create("file://"+Environment.getExternalStorageDirectory()+"/ExpenseTracker/"+"camera.jpg");
File file = new File(uri);
file.mkdirs();
file.delete();
file.createNewFile();
FileOutputStream fos = new FileOutputStream(file);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
//bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); //bitmap is the bitmap object
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] b = baos.toByteArray();
fos.write(b);
fos.flush();
fos.close();
status = true;
}else{
//uri = URI.create("file://"+name);
/*FileOutputStream out = appContext.openFileOutput("camera.jpg", android.app.Activity.MODE_APPEND);
BufferedOutputStream bos = new BufferedOutputStream(out,8192);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
bos.flush();
bos.close();*/
status = true;
}
} catch (IOException ex) {
}
return status ;
}
public void captureImage(){
mCamera.takePicture(shutterCallback, rawCallback, mPictureCallback);
}
ShutterCallback shutterCallback = new ShutterCallback() {
public void onShutter() {
// Do something when the shutter closes.
}
};
PictureCallback rawCallback = new PictureCallback() {
public void onPictureTaken(byte[] _data, Camera _camera) {
// Do something with the image RAW data.
}
};
}
please help me to find my error .....
Have you tried checking to see if that resolution is supported?
List<Camera.Size> picSizes = parameters.getSupportedPictureSizes();
List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();
You problem here:
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
...
parameters.setPreviewSize(w, h);
...
}
You can't just specify any size you want, you should use only supported sizes. Use this example to set proper preview size.
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