Thank you for this lib/app, I use it since a long time, but I encountered an issue on a Samsung Galaxy Ace 2: the app opens, but the surface where I should get the camera output stays black (with the red line on it).
02-12 21:28:34.182 7764-7764/com.google.zxing.client.android I/com.google.zxing.client.android.camera.open.OpenCameraInterface﹕ Opening camera #0
02-12 21:28:34.422 7764-7764/com.google.zxing.client.android I/CameraConfiguration﹕ Screen resolution: Point(800, 480)
02-12 21:28:34.422 7764-7764/com.google.zxing.client.android I/CameraConfiguration﹕ Supported preview sizes: 1280x720 960x720 800x480 720x480 640x480 352x288 320x240 176x144
02-12 21:28:34.422 7764-7764/com.google.zxing.client.android I/CameraConfiguration﹕ Found preview size exactly matching screen size: Point(800, 480)
02-12 21:28:34.422 7764-7764/com.google.zxing.client.android I/CameraConfiguration﹕ Camera resolution: Point(800, 480)
02-12 21:28:34.432 7764-7764/com.google.zxing.client.android I/CameraConfiguration﹕ Initial camera parameters: sharpness-max=2;brightness-step=1;zoom=0;recording-hint=false;zoom-supported=true;sharpness-min=-2;metering=center;fnumber=2.7;sharpness=0;contrast=0;whitebalance=auto;scene-mode=auto;jpeg-quality=100;preview-format-values=yuv420sp,yuv420p,yuv420mb;jpeg-thumbnail-quality=70;preview-format=yuv420sp;ev-enable=1;preview-size=640x480;focal-length=3.54;iso=auto;flash-mode-values=auto,on,off,torch;preview-frame-rate-values=15,30;preview-frame-rate=30;focus-mode-values=auto,macro,fixed;jpeg-thumbnail-width=320;scene-mode-values=auto,portrait,landscape,night,beach,sunset,dusk-dawn,fall-color,back-light,fireworks,sports,party,candlelight,text;preview-fps-range-values=(10000,31000);jpeg-thumbnail-size-values=400x240,320x240,0x0;zoom-ratios=100,110,120,130,140,150,160,170,180,190,200,210,220,230,240,250,260,270,280,290,300,310,320,330,340,350,360,370,380,390,400;record-buffer-count=4;preview-size-values=1280x720,960x720,800x480,720x480,640x480,352x288,320x240,176x144;saturation-step=1;picture-size-values=2560x1920,2560x1536,2048x1536,2048x1232,960x720,640x480;contrast-min=-3;record-mem-handle=0;preview-fps-range=10000,31000;auto-whitebalance-lock=false;min-exposure-compensation=-4;brightness-min=-2;antibanding=50hz;max-num-focus-areas=1;saturation-min=-2;contrast-max=3;vertical-view-angle=66.4;brightness-max=2;horizontal-view-angle=66.4;brightness=0;jpeg-thumbnail-height=240;record-stride=960;focus-mode=auto;contrast-step=1;sharpness-step=1;record-slice-height=480;auto-whitebalance-lock-supported=false;video-frame-format=yuv420mb;picture-format-values=jpeg;saturation-max=2;max-exposure-compensation=4;focus-areas=(-10,-10,10,10,1);video-snapshot-supported=false;exposure-compensation=0;exposure-compensation-step=1;flash-mode=off;auto-exposure-lock=false;effect-values=none,mono,negative,solarize,sepia;picture-size=2560x1920;max-zoom=30;effect=none;saturation=0;whitebalance-values=auto,incandescent,fluorescent,daylight,cloudy-daylight;picture-format=jpeg;focus-distances=0.049,0.05,0.051;wdr=0;auto-exposure-lock-supported=false;antibanding-values=auto,50hz,60hz,off
02-12 21:28:34.432 7764-7764/com.google.zxing.client.android I/CameraConfiguration﹕ Supported values: [auto, on, off, torch]
02-12 21:28:34.432 7764-7764/com.google.zxing.client.android I/CameraConfiguration﹕ Settable value: off
02-12 21:28:34.432 7764-7764/com.google.zxing.client.android I/CameraConfiguration﹕ Supported FPS ranges: [[I@41a5f4b0]
02-12 21:28:34.432 7764-7764/com.google.zxing.client.android I/CameraConfiguration﹕ Supported values: [auto, macro, fixed]
02-12 21:28:34.432 7764-7764/com.google.zxing.client.android I/CameraConfiguration﹕ Settable value: auto
02-12 21:28:34.442 7764-7764/com.google.zxing.client.android I/DecodeThread﹕ Hints: {POSSIBLE_FORMATS=[AZTEC, CODABAR, CODE_39, CODE_93, CODE_128, DATA_MATRIX, EAN_8, EAN_13, ITF, PDF_417, QR_CODE, RSS_14, RSS_EXPANDED, UPC_A, UPC_E], NEED_RESULT_POINT_CALLBACK=com.google.zxing.client.android.ViewfinderResultPointCallback@41a38e30}
02-12 21:28:35.614 7764-7764/com.google.zxing.client.android I/AutoFocusManager﹕ Current focus mode 'auto'; use auto focus? true
02-12 21:28:35.624 7764-7764/com.google.zxing.client.android I/Choreographer﹕ Skipped 90 frames! The application may be doing too much work on its main thread.
02-12 21:28:35.644 7764-7764/com.google.zxing.client.android D/CameraManager﹕ Calculated framing rect: Rect(150, 90 - 650, 390)