[android-developers] Re: Camera preview freezes when I press HOME button

haven't come across this issue myself but using Sleep is not the way to solve anything...

I'd suggest you go the other route - When taking a picture put up a timer of the length it takes the slowest device to process the picture (let say, 3 seconds). If home is pressed in that time frame, do not pause/stop the camera, let the app pause  regularly  and the camera to finish its thing.

once the timer finishes, if the home button was pressed, then pause/stop the camera.

On Friday, July 26, 2013 12:50:50 AM UTC+3, Linda Li wrote:

It would be easy to repeat the problem when I use an old device, which takes 1-2 secs to finish taking a picture.

So when I press HOME button, while the device is taking picture, often times it freezes at the preview picture.
I have added camera stopPreview and release in onPause(), which will be called when HOME button is pressed.

From the LogCat, I find that the camera hardware is still processing some information, but Activity Manager kicks in, saying something about HOME activity.

So I think HOME forces some camera procedure finished in a bad way, which makes the camera preview freezes, and the camera cannot be opened any more (e.g. when I try to open the default camera, it says it cannot access to camera)

However, if I use the default camera of the old slow device :), I cannot repeat the crash. So it seems the default camera application might handle it well; it might access native libraries to handle the situation, or something else.

If I use Nexus 4 device, it is very hard to repeat this experiment.
A less powerful device is needed to repeat the experiment.

[UPDATE]
I put the Logcat at the end of the post (it is long). Here is a brief review.

After click the capture button,

07-25 14:20:08.517: I/Camera Preview(1517): For Debug: begin mCamera.takePicture

Then I press the HOME button, the log below shows that android.intent.action.MAIN kicks in.

07-25 14:20:08.867: I/ActivityManager(188): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10200000 cmp=com.htc.launcher/.Launcher } from pid 188

07-25 14:20:09.337: I/Camera Preview(1517): For Debug: after mCamera.takePicture

07-25 14:20:09.337: I/CameraActivity(1517): For Debug: in onPause();

Regarding how to process in onPause, which will be callsed by HOME button, I tried two options.
One option is that onPause releases the camera.

Another option is,
I put Thread.sleep(1500) to let my activity has enough time to finish something.

But with either option, the camear crashes, and cannot be launched any more.

*******************************
Long logcat:

    07-25 14:20:07.736: I/Camera Preview(1517): For Debug: begin: mCamera.autoFocus(mContinuousAutoFocusCallback);
    07-25 14:20:07.736: I/Camera Preview(1517): For Debug: Unexpected exception while doing continuous focusingjava.lang.NullPointerException
    07-25 14:20:07.766: I/Camera Preview(1517): For Debug: onClick mCamera.autoFocus and take a picture
    07-25 14:20:07.766: D/CameraService(70): autoFocus (pid 1517)
    07-25 14:20:07.766: D/QualcommCameraHardware(70): autoFocus E
    07-25 14:20:07.766: D/QualcommCameraHardware(70): autoFocus X
    07-25 14:20:07.766: D/QualcommCameraHardware(70): runAutoFocus E
    07-25 14:20:07.766: D/QualcommCameraHardware(70): af start (fd 39)
    07-25 14:20:07.766: I/mm-camera 8x vfe(70): ch=971 cw=1619 vof=485 hof=809 wh=485 ww=809
    07-25 14:20:07.916: D/WifiStateTracker(188): Reset connections and stopping DHCP
    07-25 14:20:07.916: I/wpa_supplicant(487): Rx Data Filter Remove [5] command
    07-25 14:20:07.916: I/wpa_supplicant(487): auto ip disabled
    07-25 14:20:07.916: I/wpa_supplicant(487): Rx Data Filter: do not support, ignore
    07-25 14:20:07.926: D/NetUtils(188): ifc_get_info addr=0 !
    07-25 14:20:08.497: D/mm-camera af_core(70): af_beta is executing!!
    07-25 14:20:08.517: D/QualcommCameraHardware(70): native_set_afmode: ctrlCmd.status == 2
    07-25 14:20:08.517: D/QualcommCameraHardware(70): af done: 0
    07-25 14:20:08.517: D/CameraService(70): focus lenPos 0 status 0 macro_threshold 10
    07-25 14:20:08.517: D/CameraService(70): CameraService::Client::handleGenericNotify: msgType = CAMERA_MSG_FOCUS
    07-25 14:20:08.517: D/CameraService(70): CameraService::Client::handleGenericNotify: callback
    07-25 14:20:08.517: I/Camera Preview(1517): For Debug: onClick mCamera.autoFocus, onAutoFocus: want to know the time difference
    07-25 14:20:08.517: I/Camera Preview(1517): For Debug: begin mCamera.takePicture
    07-25 14:20:08.517: D/QualcommCameraHardware(70): runAutoFocus X
    07-25 14:20:08.517: D/CameraService(70): setPreviewCallbackFlag(0) (pid 1517)
    07-25 14:20:08.517: D/CameraService(70): takePicture (pid 1517)
    07-25 14:20:08.517: D/QualcommCameraHardware(70): takePicture(463)
    07-25 14:20:08.517: D/QualcommCameraHardware(70): val_ril_status = 0,val_wimax_status = 0,val_hotspot_status = 0,val_low_temp_limit = 10.000000,val_batt_temp = 36.500000,val_low_temp_limit = 15,val_batt_cap  = 79
    07-25 14:20:08.517: D/QualcommCameraHardware(70): FLASHLIGHT is ENABLED
    07-25 14:20:08.517: E/mm-camera-af(70): af_algo_preview: FAILED....
    07-25 14:20:08.867: I/ActivityManager(188): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10200000 cmp=com.htc.launcher/.Launcher } from pid 188
    07-25 14:20:08.927: D/WifiStateTracker(188): Disabling interface
    07-25 14:20:08.927: W/wpa_supplicant(487): l2_packet_receive - recvfrom
    07-25 14:20:08.977: D/NetSharing_NSReceiver(544): onReceive : android.net.wifi.STATE_CHANGE
    07-25 14:20:08.977: I/NetSharing_NSReceiver(544): wifienabled:false
    07-25 14:20:09.267: D/QualcommCameraHardware(70): stopPreviewInternal E: 1
    07-25 14:20:09.267: D/QualcommCameraHardware(70): cancelAutoFocusInternal E
    07-25 14:20:09.267: D/QualcommCameraHardware(70): cancelAutoFocusInternal X: 0
    07-25 14:20:09.327: I/QualcommCameraHardware(70): deinitPreview E
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 32, reg = 1 buffer = 0x41121000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 32, reg = 1 buffer = 0x41221000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 32, reg = 1 buffer = 0x41321000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 32, reg = 1 buffer = 0x41421000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 35, reg = 1 buffer = 0x41521000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 35, reg = 1 buffer = 0x41621000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 35, reg = 1 buffer = 0x41721000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 35, reg = 1 buffer = 0x41821000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 35, reg = 1 buffer = 0x41921000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 35, reg = 1 buffer = 0x41a21000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 35, reg = 1 buffer = 0x41b21000
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 35, reg = 1 buffer = 0x41c21000
    07-25 14:20:09.327: D/QualcommCameraHardware(70): frame_thread X
    07-25 14:20:09.327: I/QualcommCameraHardware(70): deinitPreview X
    07-25 14:20:09.327: D/QualcommCameraHardware(70): stopPreviewInternal X: 0
    07-25 14:20:09.327: D/QualcommCameraHardware(70): initRaw: mFrameThreadWaitLock.lock()
    07-25 14:20:09.327: D/QualcommCameraHardware(70): initRaw: mFrameThreadWaitLock.unlock()
    07-25 14:20:09.327: D/QualcommCameraHardware(70): initRaw E: raw size=3264x2448
    07-25 14:20:09.327: D/QualcommCameraHardware(70): initRaw: original raw ratio = 0.750000
    07-25 14:20:09.327: D/QualcommCameraHardware(70): initRaw: raw ratio = 0.750000, display size=800x480
    07-25 14:20:09.327: D/QualcommCameraHardware(70): initRaw: thumbnail_width=800, thumbnail_height=608, thumbnail_buffer_size=729600
    07-25 14:20:09.327: D/QualcommCameraHardware(70): native_access_parm: fd 15, type 1, length 32
    07-25 14:20:09.327: D/mm-camera-ov8810_u(70): cam_mode_sel 0
    07-25 14:20:09.327: D/QualcommCameraHardware(70): initRaw: initializing mRawHeap.
    07-25 14:20:09.327: E/MemoryHeapBase(70): error opening /dev/pmem_camera: No such file or directory
    07-25 14:20:09.327: W/QualcommCameraHardware(70): failed to construct master heap for pmem pool /dev/pmem_camera
    07-25 14:20:09.327: W/QualcommCameraHardware(70): initRaw X failed with pmem_camera, trying with pmem_adsp
    07-25 14:20:09.327: I/QualcommCameraHardware(70): pmem pool /dev/pmem_adsp ioctl(fd = 37, PMEM_GET_SIZE) is 16777216
    07-25 14:20:09.327: D/QualcommCameraHardware(70): mBufferSize=11985408, mAlignedBufferSize=11988992
    07-25 14:20:09.327: E/QualcommCameraHardware(70): num_buffers = 1
    07-25 14:20:09.327: I/QualcommCameraHardware(70): register_buf: camfd = 35, reg = 0 buffer = 0x4227f000
    07-25 14:20:09.327: D/QualcommCameraHardware(70): do_mmap snapshot pbuf = 0x4227f000, pmem_fd = 37
    07-25 14:20:09.327: D/QualcommCameraHardware(70): initRaw: initializing mJpegHeap.
    07-25 14:20:09.337: I/QualcommCameraHardware(70): pmem pool /dev/pmem_adsp ioctl(fd = 40, PMEM_GET_SIZE) is 1048576
    07-25 14:20:09.337: D/QualcommCameraHardware(70): mBufferSize=729600, mAlignedBufferSize=1048576
    07-25 14:20:09.337: E/QualcommCameraHardware(70): num_buffers = 1
    07-25 14:20:09.337: I/QualcommCameraHardware(70): register_buf: camfd = 38, reg = 0 buffer = 0x41521000
    07-25 14:20:09.337: D/QualcommCameraHardware(70): initRaw X
    07-25 14:20:09.337: I/Camera Preview(1517): For Debug: after mCamera.takePicture
    07-25 14:20:09.337: I/CameraActivity(1517): For Debug: in onPause(); before Thread.sleep(1500)
    07-25 14:20:09.337: I/CameraActivity(1517): For Debug: mPreview.mCameraTakePictureTF:  true
    07-25 14:20:09.337: I/CameraActivity(1517): For Debug: in onPause(); before Thread.sleep(1500)
    07-25 14:20:09.337: D/QualcommCameraHardware(70): snapshot_thread E
    07-25 14:20:09.367: D/QualcommCameraHardware(70): receiveRawPicture: E
    07-25 14:20:09.377: W/ActivityManager(188): Activity pause timeout for HistoryRecord{409ff310 com.barclays.common.howtoMoreFun/com.barclays.common.howto.ui.screens.camera.CameraActivity}
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.camifConfig.vSyncEdge 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.camifConfig.hSyncEdge 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.camifConfig.syncMode 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.camifConfig.vfeSubSampleEnable 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.camifConfig.busSubSampleEnable 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.camifConfig.irqSubSampleEnable 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.camifConfig.binningEnable 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.camifConfig.misrEnable 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.EFS.efsEndOfLine 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.EFS.efsStartOfLine 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.EFS.efsEndOfFrame 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.EFS.efsStartOfFrame 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.window.firstPixel 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.window.lastPixel 3279
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.window.firstLine 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.window.lastLine 2455
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.frame.pixelsPerLine 3280
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.frame.linesPerFrame 2456
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.subsample.pixelSkipMask 65535
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.subsample.lineSkipMask 65535
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.subsample.frameSkip 0
    07-25 14:20:09.388: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.subsample.frameSkipMode 0
    07-25 14:20:09.398: D/mm-camera 8x-vfe snapshot(70): VFE_CAMIFCfgCmd.subsample.pixelSkipWrap 0
    07-25 14:20:09.398: E/mm-camera 8x vfe(70): vfe_util_updaterollofftbl: sensor doesn't support rolloff correction by VFE
    07-25 14:20:09.398: W/mm-camera-zoom(70): Output1 and Output2 aspect ratios differ. Frames may be distorted
    07-25 14:20:09.398: D/mm-camera-ov8810_u(70): ov8810_set_snapshot_exposure_gain led_active = 0
    07-25 14:20:09.398: D/mm-camera-ov8810_u(70): ov8810_set_snapshot_exposure_gain snapshot_config_ptr->antibanding 1, snapshot: gain 48 linecount 2496
    07-25 14:20:09.398: D/mm-camera-ov8810_u(70): ov8810_set_snapshot_exposure_gain snapshot_linesPerFrame 2500 snapshot_fps 2472.434608 snapshot_exposuretime 0.103376
    07-25 14:20:09.398: D/mm-camera-ov8810_u(70): Anti-banding 60Hz, new exp_time (ms) = 0.100000, no antiband exp_time = 0.103376
    07-25 14:20:09.398: D/mm-camera-ov8810_u(70): actual snapshot: gain 48 linecount 2414
    07-25 14:20:09.398: W/Rosie(433): mAddHtcWidgetByOtherActivity = false, mIsOpenSlideWhenLeaveLaunch = true
    07-25 14:20:09.458: D/mm-camera-awb(70): awb_prepare_wb_for_snapshot r_gain 182, g_gain 141, b_gain 233
    07-25 14:20:09.458: D/mm-camera-awb(70): agw_sample_decision=2
    07-25 14:20:09.548: D/QualcommCameraHardware(70): notifyShutter size.width 800 size.height 608
    07-25 14:20:09.548: D/CameraService(70):  Snapshot image width=800, height=608
    07-25 14:20:09.628: W/InputManagerService(188): [unbindCurrentClientLocked] Disable input method client.
    07-25 14:20:09.628: W/InputManagerService(188): [startInputLocked] Enable input method client.
    07-25 14:20:09.818: D/QualcommCameraHardware(70): native_access_parm: fd 15, type 67, length 4
    07-25 14:20:09.818: D/CameraService(70): handleRawPicture: bActionScreen: 1
    07-25 14:20:09.818: D/CameraService(70): handleRawPicture E, m_ReceivedRawCount: 0
    07-25 14:20:09.818: D/CameraService(70): postProcess, bActionScreen:1, isoValue:297, prop_iso_midband_i:400, bUseNoise:0, bUseBoost:0
    07-25 14:20:09.828: D/CameraService(70): handleRawPicture data Callback E
    07-25 14:20:09.828: D/CameraService(70): handleRawPicture X
    07-25 14:20:09.828: D/CameraService(70): handleRawPicture: bActionScreen: 0
    07-25 14:20:09.828: D/CameraService(70): handleRawPicture E, m_ReceivedRawCount: 1
    07-25 14:20:09.828: D/CameraService(70): postProcess, bActionScreen:0, isoValue:297, prop_iso_midband_i:400, bUseNoise:0, bUseBoost:0
    07-25 14:20:09.828: D/QualcommCameraHardware(70): ######  PA: KPI CAPTURE TIME: 483 ms. #####
    07-25 14:20:09.828: D/QualcommCameraHardware(70): native_jpeg_encode, rotation = 90
    07-25 14:20:09.828: D/QualcommCameraHardware(70): native_access_parm: fd 15, type 67, length 4
    07-25 14:20:10.839: I/CameraActivity(1517): For Debug: in onPause(); after Thread.sleep(1500)
    07-25 14:20:10.839: I/CameraActivity(1517): For Debug: begin: finishCamera(), super.onPause()
    07-25 14:20:10.839: D/CameraService(70): stopPreview (pid 1517)
    07-25 14:20:10.839: D/QualcommCameraHardware(70): stopPreview: E
    07-25 14:20:10.839: D/QualcommCameraHardware(70): stopPreviewInternal E: 0
    07-25 14:20:10.839: D/QualcommCameraHardware(70): stopPreviewInternal X: 0
    07-25 14:20:10.839: D/QualcommCameraHardware(70): stopPreview: X
    07-25 14:20:10.839: D/CameraService(70): setPreviewCallbackFlag(0) (pid 1517)
    07-25 14:20:10.839: D/CameraService(70): setPreviewCallbackFlag(0) (pid 1517)
    07-25 14:20:10.839: D/CameraService(70): disconnect E (pid 1517)
    07-25 14:20:10.839: D/CameraService(70): hardware teardown
    07-25 14:20:10.839: D/QualcommCameraHardware(70): stopPreview: E
    07-25 14:20:10.839: D/QualcommCameraHardware(70): stopPreviewInternal E: 0
    07-25 14:20:10.839: D/QualcommCameraHardware(70): stopPreviewInternal X: 0
    07-25 14:20:10.839: D/QualcommCameraHardware(70): stopPreview: X
    07-25 14:20:10.839: D/mm-camera-ctrlcmd(70): config_proc_CAMERA_STOP_SNAPSHOT: received CAMERA_STOP_SNAPSHOT!, ctrl->state = 13
    07-25 14:20:10.839: D/mm-camera-ctrlcmd(70): config_proc_CAMERA_STOP_SNAPSHOT: snapshot is already stopped (state 13)
    07-25 14:20:10.839: E/mm-camera 8x-vfe(70): Received VFE Stop ACK!!! ctrlCmd is NULL
    07-25 14:20:10.839: D/QualcommCameraHardware(70): release E
    07-25 14:20:10.839: D/QualcommCameraHardware(70): release: waiting for snapshot mode to complete.
    07-25 14:20:10.989: I/mm-camera(70): signaling jpeg-encoding completion
    07-25 14:20:10.989: W/CameraService(70): lockIfMessageWanted(256): enter sleep
    07-25 14:20:11.560: I/ActivityManager(188): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.android.camera/.CameraEntry bnds=[360,586][477,704] } from pid 433

 

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