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POAndroid take photo on unlock secretly
 

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    <p>I am trying to build an app which captures a photo everytime the phone is unlocked. The user should not see that a photo has been taken. So it should basically behave like an anti-theft app.</p> <p>I have read that I should use a dummy SurfaceTexture, so the preview is not shown on the screen, but I am not able to capture a photo.</p> <p>Here is what I have written so far. It is just a sample activity to get in touch with the Camera object:</p> <pre><code>package com.brushmate.chameleon; import java.io.IOException; import android.graphics.SurfaceTexture; import android.hardware.Camera; import android.os.Bundle; import android.os.SystemClock; import android.annotation.SuppressLint; import android.app.Activity; import android.util.Log; import android.view.SurfaceView; public class SettingsActivity extends Activity { private static final String TAG = "Chameleon Wallpaper"; @SuppressLint("NewApi") protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_settings); Log.d(TAG, "Activity created"); Camera cam = getCamera(); if (cam != null) { Log.d(TAG, "Camera available"); SurfaceTexture dummy = new SurfaceTexture(0); try { cam.setPreviewTexture(dummy); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } Log.d(TAG, "Preview texture set"); cam.startPreview(); Log.d(TAG, "Preview started"); cam.takePicture(null, null, new Camera.PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { Log.d(TAG, "Image taken"); } }); cam.stopPreview(); Log.d(TAG, "Preview stopped"); cam.release(); Log.d(TAG, "Camera released"); } } private Camera getCamera() { Camera cam = null; try { cam = Camera.open(); } catch (RuntimeException e) { Log.e(TAG, "Camera not available", e); } return cam; } } </code></pre> <p>And here is my Logcat output:</p> <pre><code>05-12 23:54:56.947: D/Chameleon Wallpaper(19614): Activity created 05-12 23:54:56.947: I/AwesomePlayer(161): setDataSource_l(URL suppressed) 05-12 23:54:56.977: I/AwesomePlayer(161): setDataSource_l(URL suppressed) 05-12 23:54:57.007: I/CameraClient(161): Opening camera 0 05-12 23:54:57.117: E/mm-camera(175): sensor_load_chromatix: libchromatix_imx111_preview.so: 30 05-12 23:54:57.217: E/mm-camera(175): vfe_ops_init: E 05-12 23:54:57.237: E/mm-camera(175): vfe_legacy_stats_buffer_init: AEC_STATS_BUFNUM 05-12 23:54:57.237: E/mm-camera(175): vfe_legacy_stats_buffer_init: AEC_STATS_BUFNUM 05-12 23:54:57.247: E/mm-camera(175): mctl_init_stats_proc_info: snap_max_line_cnt =30096 05-12 23:54:57.267: D/Chameleon Wallpaper(19614): Camera available 05-12 23:54:57.267: D/Chameleon Wallpaper(19614): Preview texture set 05-12 23:54:57.267: E/QCameraHWI(161): android::status_t android::QCameraHardwareInterface::setPreviewWindow(preview_stream_ops_t*): mPreviewWindow = 0x0x400b9e98, mStreamDisplay = 0x0x4008c378 05-12 23:54:57.267: D/QCameraHWI(161): android::status_t android::QCameraHardwareInterface::startPreview(): start preview now 05-12 23:54:57.267: I/QCameraHWI(161): android::status_t android::QCameraHardwareInterface::startPreview2():Setting ZSL mode 05-12 23:54:57.267: E/mm-camera(175): config_proc_CAMERA_SET_INFORM_STARTPREVIEW 05-12 23:54:57.267: E/mm-camera(175): config_update_stream_info Storing stream parameters for video inst 1 as : width = 640, height 480, format = 1 inst_handle = 810081 cid = 0 05-12 23:54:57.307: E/mm-camera(175): config_update_stream_info Storing stream parameters for video inst 3 as : width = 640, height 480, format = 1 inst_handle = 830083 cid = 0 05-12 23:54:57.307: E/mm-camera(175): config_update_stream_info Storing stream parameters for video inst 4 as : width = 512, height 384, format = 1 inst_handle = 840084 cid = 0 05-12 23:54:57.307: E/mm-camera(175): config_decide_vfe_outputs: Ports Used 3, Op mode 1 05-12 23:54:57.307: E/mm-camera(175): config_decide_vfe_outputs Current mode 0 Full size streaming : Disabled 05-12 23:54:57.307: E/mm-camera(175): config_decide_vfe_outputs: Primary: 640x480, extra_pad: 0x0, Fmt: 1, Type: 1, Path: 1 05-12 23:54:57.307: E/mm-camera(175): config_decide_vfe_outputs: Secondary: 640x480, extra_pad: 0x0, Fmt: 1, Type: 3, Path: 4 05-12 23:54:57.307: E/mm-camera(175): config_update_inst_handles Updated the inst handles as 810081, 830083, 0, 0 05-12 23:54:57.387: W/ActivityManager(592): Activity pause timeout for ActivityRecord{420bd848 u0 com.brushmate.chameleon/.SettingsActivity} 05-12 23:54:57.447: E/mm-camera(175): sensor_load_chromatix: libchromatix_imx111_zsl.so: 26 05-12 23:54:57.537: E/mm-camera(175): camif_client_set_params: camif has associated with obj mask 0x1 05-12 23:54:57.537: E/mm-camera(175): config_v2_CAMERA_START_common CAMIF_PARAMS_ADD_OBJ_ID failed -1 05-12 23:54:57.537: E/mm-camera(175): vfe_operation_config: format 3 05-12 23:54:57.537: E/mm-camera(175): vfe_operation_config:vfe_op_mode=5 05-12 23:54:57.537: E/mm-camera(175): Invalid ASD Set Params Type 05-12 23:54:57.537: E/mm-camera(175): vfe_set_bestshot: Bestshot mode not changed 05-12 23:54:57.567: D/Chameleon Wallpaper(19614): Preview started 05-12 23:54:57.607: E/mm-libcamera2(161): PROFILE HAL: First preview frame received: 1368395697.614272749 05-12 23:54:57.607: E/BufferQueue(19614): [unnamed-19614-0] dequeueBuffer: min undequeued buffer count (2) exceeded (dequeued=6 undequeudCount=0) 05-12 23:54:57.647: E/mm-libcamera2(161): mm_camera_dispatch_buffered_frames: mframe 0x0, sframe = 0x0 05-12 23:54:57.647: E/mm-libcamera2(161): PROFILE HAL: stopPreview(): E: 1368395697.653949232 05-12 23:54:57.647: E/mm-camera(175): config_MSG_ID_STOP_ACK: streamon_mask is not clear. Should not call PP_Release_HW 05-12 23:54:57.667: D/Chameleon Wallpaper(19614): Preview stopped 05-12 23:54:57.667: E/mm-libcamera2(161): PROFILE HAL: stopPreview(): E: 1368395697.676839512 05-12 23:54:57.667: E/QCameraHWI(161): android::status_t android::QCameraHardwareInterface::setPreviewWindow(preview_stream_ops_t*):Received Setting NULL preview window 05-12 23:54:57.677: E/QCameraHWI(161): android::status_t android::QCameraHardwareInterface::setPreviewWindow(preview_stream_ops_t*): mPreviewWindow = 0x0x0, mStreamDisplay = 0x0x4008c378 05-12 23:54:57.677: W/QCameraHWI_Preview(161): Setting NULL preview window 05-12 23:54:57.677: I/CameraClient(161): Destroying camera 0 05-12 23:54:57.687: E/mm-camera(175): config_shutdown_pp Camera not in streaming mode. Returning. 05-12 23:54:57.687: E/mm-camera(175): vfe_ops_deinit: E 05-12 23:54:57.758: D/Chameleon Wallpaper(19614): Camera released 05-12 23:54:57.758: W/AudioFlinger(161): session id 77 not found for pid 161 05-12 23:54:57.758: W/AudioFlinger(161): session id 78 not found for pid 161 05-12 23:54:57.808: D/libEGL(19614): loaded /system/lib/egl/libEGL_adreno200.so 05-12 23:54:57.808: D/libEGL(19614): loaded /system/lib/egl/libGLESv1_CM_adreno200.so 05-12 23:54:57.808: D/libEGL(19614): loaded /system/lib/egl/libGLESv2_adreno200.so 05-12 23:54:57.818: I/Adreno200-EGL(19614): &lt;eglInitialize:269&gt;: EGL 1.4 QUALCOMM build: Nondeterministic AU_full_mako_PARTNER-ANDROID/JB-MR1-DEV_CL2961380_release_AU (CL2961380) 05-12 23:54:57.818: I/Adreno200-EGL(19614): Build Date: 12/10/12 Mon 05-12 23:54:57.818: I/Adreno200-EGL(19614): Local Branch: 05-12 23:54:57.818: I/Adreno200-EGL(19614): Remote Branch: m/partner-android/jb-mr1-dev 05-12 23:54:57.818: I/Adreno200-EGL(19614): Local Patches: NONE 05-12 23:54:57.818: I/Adreno200-EGL(19614): Reconstruct Branch: NOTHING 05-12 23:54:57.848: D/OpenGLRenderer(19614): Enabling debug mode 0 05-12 23:54:57.888: I/ActivityManager(592): Displayed com.brushmate.chameleon/.SettingsActivity: +1s63ms </code></pre> <p>As far as I understood, the procedure is correct. So what am I doing wrong?</p>
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