I successfully created a camera surface view, and it works when the app is started/restarted. But it just shows a black screen, after I pause the game and resume it (pressing home screen). Am I missing something here?
Here's the code for the surface (which is created from a Main Activity:
public class CameraView extends SurfaceView implements SurfaceHolder.Callback{
static Camera camera = null;
Surface camSurface;
String TAG = "CameraView";
static SurfaceHolder mHolder;
public CameraView(Context context) {
super(context);
getHolder().addCallback(this);
getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
// TODO Auto-generated constructor stub
}
#Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
#Override
public void surfaceCreated(SurfaceHolder arg0) {
// TODO Auto-generated method stub
Log.e(TAG, "Camera view created");
mHolder = getHolder();
if(camera == null){
camera = Camera.open();
}
if(camera == null){
Log.e(TAG, "Null camera");
}
try {
camera.setPreviewDisplay(getHolder());
} catch (IOException e) {
// TODO Auto-generated catch block
camera.release();
camera = null;
e.printStackTrace();
}
}
#Override
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
synchronized(mHolder){
if(camera!=null){
camera.stopPreview();
camera.release();
camera = null;
}
}
}
}
When you leave and return to your app, you still need to call camera.startPreview() at some point. I would have this in my surfaceChanged() method.
Make sure you have a valid instance of your camera as when you first start it up.
Related
I am taking four pictures with android camera. After each picture i want the camera to preview immediately then another shot is taken. util i got four. But when i run my application it takes the first picture then i heard four camera sound. I guess other photo is being displayed but not shown on the surface view. how can i fix this?
here is my code.
public class TakePhoto extends Activity implements SurfaceHolder.Callback, OnClickListener{
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean previewing = false;
LayoutInflater controlInflater = null;
TextView textView1 ;
/** Called when the activity is first created. */
ImageView takepicture;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
getWindow().setFormat(PixelFormat.UNKNOWN);
surfaceView = (SurfaceView)findViewById(R.id.camerapreview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
controlInflater = LayoutInflater.from(getBaseContext());
View viewControl = controlInflater.inflate(R.layout.control, null);
LayoutParams layoutParamsControl
= new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT);
this.addContentView(viewControl, layoutParamsControl);
takepicture = (ImageView)findViewById(R.id.takepicture);
takepicture.setOnClickListener(this);
textView1 = (TextView)findViewById(R.id.textView1);
textView1.setText("");
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
if(previewing){
camera.stopPreview();
previewing = false;
}
if (camera != null){
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
previewing = true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera = Camera.open(CameraInfo.CAMERA_FACING_FRONT);
camera.setDisplayOrientation(90);
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera.stopPreview();
camera.release();
camera = null;
previewing = false;
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.takepicture:
new CountDownTimer(4000, 1000) {
public void onTick(long millisUntilFinished) {
textView1.setText(" " + millisUntilFinished / 1000);
}
public void onFinish() {
textView1.setText("");
//camera.takePicture(myShutterCallback,
//myPictureCallback_RAW, myPictureCallback_JPG);
new CountDownTimer(5000, 1000) {
public void onTick(long millisUntilFinished) {
camera.startPreview();
camera.takePicture(myShutterCallback, myPictureCallback_JPG, myPictureCallback_JPG);
}
public void onFinish() {
textView1.setText("");
}
}.start();
}
}.start();
break;
}
}
ShutterCallback myShutterCallback = new ShutterCallback(){
#Override
public void onShutter() {
// TODO Auto-generated method stub
}
};
PictureCallback myPictureCallback_RAW = new PictureCallback(){
#Override
public void onPictureTaken(byte[] arg0, Camera arg1) {
// TODO Auto-generated method stub
}
};
PictureCallback myPictureCallback_JPG = new PictureCallback(){
#Override
public void onPictureTaken(byte[] arg0, Camera arg1) {
// TODO Auto-generated method stub
Bitmap bitmapPicture
= BitmapFactory.decodeByteArray(arg0, 0, arg0.length);
}
};
private class CaptureThread extends Thread {
#Override
public void run() {
int count = 0;
while(count < 4) {
camera.takePicture(myShutterCallback, myPictureCallback_JPG, myPictureCallback_JPG);
count++;
try {
Thread.sleep(3000);
} catch (InterruptedException exception) {
exception.printStackTrace();
}
}
}
}
}
}
I am working with a camera and facing problem in camera orientation. I have found some answer over internet and I think this answer might be best fit for me.
Can anybody give me detail instruction, how to add this answer in my camera project.?
Here is my Full camera project Code.
Direct code here
public class AndroidCamera extends Activity implements SurfaceHolder.Callback{
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean previewing = false;
LayoutInflater controlInflater = null;
Button buttonTakePicture;
final int RESULT_SAVEIMAGE = 0;
/** Called when the activity is first created. */
#SuppressWarnings("deprecation")
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
getWindow().setFormat(PixelFormat.UNKNOWN);
surfaceView = (SurfaceView)findViewById(R.id.camerapreview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
controlInflater = LayoutInflater.from(getBaseContext());
View viewControl = controlInflater.inflate(R.layout.control, null);
LayoutParams layoutParamsControl
= new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT);
this.addContentView(viewControl, layoutParamsControl);
buttonTakePicture = (Button)findViewById(R.id.takepicture);
buttonTakePicture.setOnClickListener(new Button.OnClickListener(){
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
camera.takePicture(myShutterCallback,
myPictureCallback_RAW, myPictureCallback_JPG);
}});
LinearLayout layoutBackground = (LinearLayout)findViewById(R.id.background);
layoutBackground.setOnClickListener(new LinearLayout.OnClickListener(){
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
buttonTakePicture.setEnabled(false);
camera.autoFocus(myAutoFocusCallback);
}});
}
AutoFocusCallback myAutoFocusCallback = new AutoFocusCallback(){
#Override
public void onAutoFocus(boolean arg0, Camera arg1) {
// TODO Auto-generated method stub
buttonTakePicture.setEnabled(true);
}};
ShutterCallback myShutterCallback = new ShutterCallback(){
#Override
public void onShutter() {
// TODO Auto-generated method stub
}};
PictureCallback myPictureCallback_RAW = new PictureCallback(){
#Override
public void onPictureTaken(byte[] arg0, Camera arg1) {
// TODO Auto-generated method stub
}};
PictureCallback myPictureCallback_JPG = new PictureCallback(){
#Override
public void onPictureTaken(byte[] arg0, Camera arg1) {
// TODO Auto-generated method stub
/*Bitmap bitmapPicture
= BitmapFactory.decodeByteArray(arg0, 0, arg0.length); */
Uri uriTarget = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, new ContentValues());
OutputStream imageFileOS;
try {
imageFileOS = getContentResolver().openOutputStream(uriTarget);
imageFileOS.write(arg0);
imageFileOS.flush();
imageFileOS.close();
Toast.makeText(AndroidCamera.this,
"Image saved",
Toast.LENGTH_SHORT).show();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
camera.startPreview();
}};
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
if(previewing){
camera.stopPreview();
previewing = false;
}
if (camera != null){
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
previewing = true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera = Camera.open();
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera.stopPreview();
camera.release();
camera = null;
previewing = false;
}
}
In order to fix your camera's orientation changed your surfaceCreated function to rotate the camera from the default android camera default of landscape mode to portait mode (because your activity is in portrait mode):
#Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
Parameters parameters = camera.getParameters();
camera.setDisplayOrientation(90);
camera.setParameters(parameters);
}
Your app also crashes when you try and take a picture... but that is not the issue at hand... though it might have to do with you needing to add the following line to your manifest:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
:)
I have a camera project and it can take picture but when I press take picture button twice rapidly it crashes.
The line number 71 in LogCat is camera.takePicture(myShutterCallback, myPictureCallback_RAW, myPictureCallback_JPG);
Here is the log file https://dl.dropbox.com/u/15065300/LogCat2.png
Here is the code
public class AndroidCamera extends Activity implements SurfaceHolder.Callback{
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean previewing = false;
LayoutInflater controlInflater = null;
Button buttonTakePicture;
final int RESULT_SAVEIMAGE = 0;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
getWindow().setFormat(PixelFormat.UNKNOWN);
surfaceView = (SurfaceView)findViewById(R.id.camerapreview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
controlInflater = LayoutInflater.from(getBaseContext());
View viewControl = controlInflater.inflate(R.layout.control, null);
LayoutParams layoutParamsControl
= new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT);
this.addContentView(viewControl, layoutParamsControl);
buttonTakePicture = (Button)findViewById(R.id.takepicture);
buttonTakePicture.setOnClickListener(new Button.OnClickListener(){
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
camera.takePicture(myShutterCallback, myPictureCallback_RAW, myPictureCallback_JPG);
}});
LinearLayout layoutBackground = (LinearLayout)findViewById(R.id.background);
layoutBackground.setOnClickListener(new LinearLayout.OnClickListener(){
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
buttonTakePicture.setEnabled(false);
camera.autoFocus(myAutoFocusCallback);
}});
}
AutoFocusCallback myAutoFocusCallback = new AutoFocusCallback(){
#Override
public void onAutoFocus(boolean arg0, Camera arg1) {
// TODO Auto-generated method stub
buttonTakePicture.setEnabled(true);
}};
ShutterCallback myShutterCallback = new ShutterCallback(){
#Override
public void onShutter() {
// TODO Auto-generated method stub
}};
PictureCallback myPictureCallback_RAW = new PictureCallback(){
#Override
public void onPictureTaken(byte[] arg0, Camera arg1) {
// TODO Auto-generated method stub
}};
PictureCallback myPictureCallback_JPG = new PictureCallback(){
#Override
public void onPictureTaken(byte[] arg0, Camera arg1) {
// TODO Auto-generated method stub
/*Bitmap bitmapPicture
= BitmapFactory.decodeByteArray(arg0, 0, arg0.length); */
Uri uriTarget = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, new ContentValues());
OutputStream imageFileOS;
try {
imageFileOS = getContentResolver().openOutputStream(uriTarget);
imageFileOS.write(arg0);
imageFileOS.flush();
imageFileOS.close();
Toast.makeText(AndroidCamera.this,
"Image saved",
Toast.LENGTH_SHORT).show();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
camera.startPreview();
}};
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
if(previewing){
camera.stopPreview();
previewing = false;
}
if (camera != null){
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
previewing = true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera.stopPreview();
camera.release();
camera = null;
previewing = false;
}
}
In the manifest:
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
May these code i have implemented can help you...!!!!
https://stackoverflow.com/a/14495691/1626848
If any thing properly u want add in comments...!!!!
I got two strange problems:
1-i'm using previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); in an App and it works normally and I tried to use the same method in another App, I found eclipse cross this method with a black line and says this method is deprecated while I'm using the same method in another App and it works correctly without any problems
JAVA CODE:
public class AugReal00 extends Activity {
SurfaceView cameraPreview;
SurfaceHolder previewHolder;
Camera camera;
Boolean inPreview;
SurfaceHolder.Callback surfaceCallback = new Callback() {
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera.stopPreview();
camera.release();
camera = null;
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
try {
//Open The Camera
this.camera = android.hardware.Camera.open();
this.camera.setPreviewDisplay(this.holder);
}
catch(IOException ioe) {
ioe.printStackTrace(System.out);
}
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
android.hardware.Camera.Parameters parameters = camera.getParameters();
parameters.setSceneMode(parameters.SCENE_MODE_SPORTS);
parameters.setFlashMode(parameters.FLASH_MODE_ON);
parameters.setPreviewSize(width/2, height/2);
parameters.setPictureSize(width/2, height/2);
camera.setParameters(parameters);
camera.startPreview();
}
};// end of surfaceCallback Listener
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_aug_real00);
inPreview = false;
cameraPreview = (SurfaceView) findViewById(R.id.cameraPreview);
previewHolder = cameraPreview.getHolder();
previewHolder.addCallback(surfaceCallback);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
//previewHolder.se;
}
public void OnResume() {
super.onResume();
camera = Camera.open();
}// end of OnResume
public void OnPause() {
if (inPreview) {
camera.stopPreview();
}
camera.release();
camera=null;
inPreview=false;
super.onPause();
}// end of OnPause.
2-I wrote a simple program and i found that eclipse gives me the following error
syntax error, insert } to complete class body
while all the brackets are closed and every thing should work fine. I don't know how to solve this issue.
Check your old app sdk version number. The same api can be deprecated in next versions.
You have not closed an opened brace. Make sure all the braces are properly inserted.
I am developing an app which needs to open the flashlight of my Galaxy Nexus device. I have referred to the post here
LED flashlight on Galaxy Nexus controllable by what API?
public class TestCamera extends Activity implements SurfaceHolder.Callback{
Camera mCamera;
public static SurfaceView preview;
public static SurfaceHolder mHolder;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
preview = (SurfaceView) findViewById(R.id.camSurface);
mHolder = preview.getHolder();
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(mHolder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Button onLEDbtn = (Button) findViewById(R.id.onLED_btn);
onLEDbtn.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "test", Toast.LENGTH_SHORT).show();
Parameters params = mCamera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
mCamera.setParameters(params);
mCamera.startPreview();
}
});
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
mHolder = holder;
try {
mCamera.setPreviewDisplay(mHolder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
mCamera.stopPreview();
mHolder = null;
}
}
Manifest:
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
However, I still cant switch on the flashlight. Could anyone point out my errors? Thanks
you must to set call back
mHolder.addCallback(this);
You need to add this tag in manifest file.
<uses-feature android:name="android.hardware.camera.flash"/>
Try to add :
android:name="android.permission.FLASHLIGHT"
android:name="android.hardware.camera.flash
And look this post :
How to turn on camera flash light programmatically in Android?