再次出现Android问题
这次我想通过HDMI和USB将7“显示器连接到我的Raspberry Pi 3（与Android Things 0.5.1一起运行） 这里显示的链接：7" HDMI LCD (C)
我也按照手册上的说明操作，并将行添加到位于我SD卡根目录的public static void killBackStack () {
for (Activity ac : backStack) {
if (ac != null)
ac.finish();
}
}
config.txt然后我插上显示器。绝对是！但显示屏只显示黑屏。
我附上了我的完整max_usb_current=1
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0
hdmi_drive=1
，也许我错过了一些东西。再说一遍：我只添加了上面显示的行
config.txt我还检查了一些其他问题，例如one 但我没有看到更多的信息:(
我也联系了制造商的支持。我有更多信息，我会在这里添加
我刚收到制造商支持的电子邮件：
是的，它可以。但是，在测试期间。只有很长的HDMI线缆 作为1米LCD可以显示新版本的Android东西。我们没有 找到原因。
我刚看了一下logcat。据我所知，系统尝试连接TouchScreen，但没有驱动程序。
这些线条看起来也很有趣，但我真的没有遇到问题：（
kernel=u-boot-dtok.bin
framebuffer_depth=16
# Prevent the firmware from loading HAT overlays now that we handle pin muxing.
# ourselves. See:
# https://www.raspberrypi.org/documentation/configuration/device-tree.md#part3.4
dtoverlay=
dtparam=i2c_arm=on
dtparam=spi=on
dtparam=audio=on
# pwm and I2S are mutually-exclusive since they share hardware clocks.
dtoverlay=pwm-2chan-with-clk,pin=18,func=2,pin2=13,func2=4
dtoverlay=generic-i2s
start_x=1
# Tell U-boot to always use the "serial0" interface for the console, which is
# set to whichever uart (uart0 or uart1) is set to the header pins. This doesn't
# interfere with the uart selected for Bluetooth.
dtoverlay=chosen-serial0
# Enable skip-init on the UART interfaces, so U-Boot doesn't attempt to
# re-initialize them.
dtoverlay=rpi-uart-skip-init
# Add pin devices to the system for use by the runtime pin configuration driver.
dtoverlay=runtimepinconfig
dtoverlay=uart1
dtoverlay=bcm2710-rpi-3-b-spi0-pin-reorder
# Tell the I2S driver to use the cprman clock.
dtoverlay=bcm2710-rpi-3-b-i2s-use-cprman
# Uncomment to disable serial port on headers, use GPIO14 and GPIO15
# as gpios and to allow the core_freq to change at runtime.
enable_uart=1
core_freq=400
# Enable hardware graphics acceleration.
dtoverlay=vc4-kms-v3d,cma-256
mask_gpu_interrupt0=0x400
avoid_warnings=2
# Support official RPi display.
dtoverlay=i2c-rtc,ds3231
dtoverlay=rpi-ft5406
hdmi_force_hotplug=1
hdmi_drive=2
# Support custom Waveshare 7inch display
max_usb_current=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0
hdmi_drive=1
这里是完整的logcat：
09-19 17:18:00.630 170-261/? E/hwc-gl-worker: Failed to make image from target buffer: EGL_BAD_PARAMETER
09-19 17:18:00.630 170-261/? E/hwc-gl-worker: Composite failed because of failed framebuffer
09-19 17:18:00.630 170-261/? E/hwc-drm-display-compositor: Failed to pre-composite layers
09-19 17:18:00.630 170-261/? E/hwc-drm-display-compositor: Failed to pre-composite for squash all composition -22
09-19 17:18:00.631 170-261/? E/hwc-platform-drm-generic: Failed to close gem handle 0 -1
我使用Android Thing 0.4.1创建了一个新图像，并使用我的设备规格扩展了--------- beginning of system
09-19 17:17:56.447 311-430/system_process D/UsbHostManager: Added device UsbDevice[mName=/dev/bus/usb/001/004,mVendorId=3823,mProductId=5,mClass=0,mSubclass=0,mProtocol=0,mManufacturerName=WaveShare,mProductName=WaveShare Touchscreen,mVersion=2.0,mSerialNumber=2016-11-06,mConfigurations=[
UsbConfiguration[mId=1,mName=null,mAttributes=192,mMaxPower=250,mInterfaces=[
UsbInterface[mId=0,mAlternateSetting=0,mName=null,mClass=3,mSubclass=0,mProtocol=0,mEndpoints=[
UsbEndpoint[mAddress=129,mAttributes=3,mMaxPacketSize=64,mInterval=1]]]]
09-19 17:17:56.473 311-326/system_process I/ActivityManager: Start proc 1277:com.android.mtp/u0a7 for broadcast com.android.mtp/.UsbIntentReceiver
09-19 17:17:56.501 311-372/system_process E/EventHub: could not get driver version for /dev/input/mouse0, Not a typewriter
09-19 17:17:56.509 1277-1277/? W/zygote: Using default instruction set features for ARM CPU variant (generic) using conservative defaults
09-19 17:17:56.551 1277-1284/? I/zygote: Debugger is no longer active
09-19 17:17:56.644 311-372/system_process D/EventHub: No input device configuration file found for device 'WaveShare WaveShare Touchscreen'.
09-19 17:17:56.644 311-372/system_process I/EventHub: New device: id=1, fd=186, path='/dev/input/event0', name='WaveShare WaveShare Touchscreen', classes=0x80000014, configuration='', keyLayout='', keyCharacterMap='', builtinKeyboard=false, wakeMechanism=EPOLLWAKEUP, usingClockIoctl=true
09-19 17:17:56.645 311-372/system_process I/InputReader: Device reconfigured: id=1, name='WaveShare WaveShare Touchscreen', size 16x16, orientation 0, mode 1, display id 0
09-19 17:17:56.645 311-372/system_process I/InputReader: Device added: id=1, name='WaveShare WaveShare Touchscreen', sources=0x00001002
09-19 17:17:56.679 935-935/? I/Binder:311_6: type=1400 audit(0.0:76): avc: denied { ptrace } for scontext=u:r:system_server:s0 tcontext=u:r:priv_app:s0:c512,c768 tclass=process permissive=1
09-19 17:17:57.909 240-240/? I/drm-event-liste: type=1400 audit(0.0:77): avc: denied { read } for path="socket:[8839]" dev="sockfs" ino=8839 scontext=u:r:hal_graphics_composer_default:s0 tcontext=u:r:hal_graphics_composer_default:s0 tclass=netlink_kobject_uevent_socket permissive=1
09-19 17:17:59.010 311-381/system_process W/AlarmManager: Unrecognized alarm listener com.android.server.wifi.WifiConfigStore$1@f0356d5
09-19 17:17:59.028 311-381/system_process D/WifiConfigStore: Writing to stores completed in 18 ms.
09-19 17:18:00.630 170-261/? E/hwc-gl-worker: Failed to make image from target buffer: EGL_BAD_PARAMETER
09-19 17:18:00.630 170-261/? E/hwc-gl-worker: Composite failed because of failed framebuffer
09-19 17:18:00.630 170-261/? E/hwc-drm-display-compositor: Failed to pre-composite layers
09-19 17:18:00.630 170-261/? E/hwc-drm-display-compositor: Failed to pre-composite for squash all composition -22
09-19 17:18:00.631 170-261/? E/hwc-platform-drm-generic: Failed to close gem handle 0 -1
09-19 17:18:08.861 311-1055/system_process D/WificondControl: Scan result ready event
09-19 17:18:30.976 311-325/system_process E/memtrack: Couldn't load memtrack module
09-19 17:18:30.976 311-325/system_process W/android.os.Debug: failed to get memory consumption info: -1
09-19 17:18:31.081 311-325/system_process E/memtrack: Couldn't load memtrack module
09-19 17:18:31.082 311-325/system_process W/android.os.Debug: failed to get memory consumption info: -1
09-19 17:18:31.407 130-130/? W//system/bin/hwservicemanager: getTransportFromManifest: Cannot find entry android.hardware.drm@1.0::IDrmFactory in either framework or device manifest, using default transport.
09-19 17:18:31.409 178-245/? E/DrmHal: Failed to find any drm factories
09-19 17:18:31.413 950-1303/com.google.android.gms.unstable W/DG.WV: Widevine DRM not supported on this device
android.media.UnsupportedSchemeException: Failed to instantiate drm object.
at android.media.MediaDrm.native_setup(Native Method)
at android.media.MediaDrm.<init>(MediaDrm.java:216)
at joi.run(:com.google.android.gms:9)
at ius.run(:com.google.android.gms:24)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at izo.run(:com.google.android.gms:0)
at java.lang.Thread.run(Thread.java:764)
09-19 17:18:31.707 311-1041/system_process D/WificondControl: Scan result ready event
09-19 17:18:32.104 950-1129/com.google.android.gms.unstable W/SystemServiceRegistry: No service published for: persistent_data_block
09-19 17:18:32.119 1129-1129/? I/Binder:950_3: type=1400 audit(0.0:78): avc: denied { read } for name="/" dev="tmpfs" ino=7244 scontext=u:r:priv_app:s0:c512,c768 tcontext=u:object_r:device:s0 tclass=dir permissive=1
09-19 17:18:32.129 1129-1129/? I/Binder:950_3: type=1400 audit(0.0:80): avc: denied { read } for name="interrupts" dev="proc" ino=4026532794 scontext=u:r:priv_app:s0:c512,c768 tcontext=u:object_r:proc_interrupts:s0 tclass=file permissive=1
09-19 17:18:32.144 950-1129/com.google.android.gms.unstable W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_U1rfdkMe/Mr,09vcaQ,w
09-19 17:18:32.150 950-1129/com.google.android.gms.unstable W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_U1rfdkMe/Mr,09vcaQ,w
09-19 17:18:34.049 783-1305/com.google.android.gms.persistent I/VacuumService: Vacuum at: now=1505841514048 tag=VacuumService
09-19 17:18:34.223 783-783/com.google.android.gms.persistent I/Auth: [ReflectiveChannelBinder] Successfully bound channel!
09-19 17:18:34.260 130-130/? W//system/bin/hwservicemanager: getTransportFromManifest: Cannot find entry android.hardware.drm@1.0::IDrmFactory in either framework or device manifest, using default transport.
09-19 17:18:34.262 178-178/? E/DrmHal: Failed to find any drm factories
09-19 17:18:34.264 950-1308/com.google.android.gms.unstable W/DG.WV: Widevine DRM not supported on this device
android.media.UnsupportedSchemeException: Failed to instantiate drm object.
at android.media.MediaDrm.native_setup(Native Method)
at android.media.MediaDrm.<init>(MediaDrm.java:216)
at joi.run(:com.google.android.gms:9)
at ius.run(:com.google.android.gms:24)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at izo.run(:com.google.android.gms:0)
at java.lang.Thread.run(Thread.java:764)
09-19 17:18:34.835 950-968/com.google.android.gms.unstable W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_U1rfdkMe/Mr,09vcaQ,w
09-19 17:18:34.839 950-968/com.google.android.gms.unstable W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_U1rfdkMe/Mr,09vcaQ,w
09-19 17:18:34.968 950-968/com.google.android.gms.unstable W/SystemServiceRegistry: No service published for: persistent_data_block
09-19 17:18:36.507 950-968/com.google.android.gms.unstable W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_U1rfdkMe/Mr,09vcaQ,w
09-19 17:18:36.514 950-968/com.google.android.gms.unstable W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_U1rfdkMe/Mr,09vcaQ,w
09-19 17:18:36.628 783-1042/com.google.android.gms.persistent W/Conscrypt: Could not set socket write timeout:
09-19 17:18:36.630 783-1042/com.google.android.gms.persistent W/Conscrypt: java.lang.reflect.Method.invoke(Native Method)
09-19 17:18:36.630 783-1042/com.google.android.gms.persistent W/Conscrypt: rkw.a(:com.google.android.gms:55)
09-19 17:18:36.752 783-1042/com.google.android.gms.persistent W/Conscrypt: Could not set socket write timeout:
09-19 17:18:36.753 783-1042/com.google.android.gms.persistent W/Conscrypt: java.lang.reflect.Method.invoke(Native Method)
09-19 17:18:36.753 783-1042/com.google.android.gms.persistent W/Conscrypt: rkw.a(:com.google.android.gms:55)
09-19 17:18:37.310 311-321/system_process I/zygote: Background concurrent copying GC freed 56654(2MB) AllocSpace objects, 4(80KB) LOS objects, 42% free, 4MB/8MB, paused 514us total 149.999ms
09-19 17:18:48.913 167-167/? D/WifiHAL: Start get packet fate command
09-19 17:18:48.913 167-167/? D/WifiHAL: createRequest Get Tx packet fate request
09-19 17:18:48.913 167-167/? E/WifiHAL: Failed to register get pkt fate response; result = -95
09-19 17:18:48.914 311-381/system_process E/WifiVendorHal: getTxPktFates(l.1941) failed {.code = ERROR_NOT_AVAILABLE, .description = }
09-19 17:18:48.915 167-167/? D/WifiHAL: Start get packet fate command
09-19 17:18:48.915 167-167/? D/WifiHAL: createRequest Get Rx packet fate request
09-19 17:18:48.915 167-167/? E/WifiHAL: Failed to register get pkt fate response; result = -95
09-19 17:18:48.916 311-381/system_process E/WifiVendorHal: getRxPktFates(l.1981) failed {.code = ERROR_NOT_AVAILABLE, .description = }
09-19 17:19:00.624 170-261/? E/hwc-gl-worker: Failed to make image from target buffer: EGL_BAD_PARAMETER
09-19 17:19:00.624 170-261/? E/hwc-gl-worker: Composite failed because of failed framebuffer
09-19 17:19:00.624 170-261/? E/hwc-drm-display-compositor: Failed to pre-composite layers
09-19 17:19:00.624 170-261/? E/hwc-drm-display-compositor: Failed to pre-composite for squash all composition -22
09-19 17:19:00.625 170-261/? E/hwc-platform-drm-generic: Failed to close gem handle 0 -1
09-19 17:19:10.975 311-325/system_process E/memtrack: Couldn't load memtrack module
09-19 17:19:10.975 311-325/system_process W/android.os.Debug: failed to get memory consumption info: -1
09-19 17:19:11.702 311-935/system_process D/WificondControl: Scan result ready event
09-19 17:19:16.084 311-325/system_process E/memtrack: Couldn't load memtrack module
09-19 17:19:16.084 311-325/system_process W/android.os.Debug: failed to get memory consumption info: -1
09-19 17:19:16.183 311-325/system_process E/memtrack: Couldn't load memtrack module
09-19 17:19:16.183 311-325/system_process W/android.os.Debug: failed to get memory consumption info: -1
，并且它正在工作......
但也许有人可以帮助我让显示器运行0.5.1？这是我的“更新”config.txt
此配置与我上面发布的配置之间存在一些差异。当然，这个配置对于AT 0.5.1
是不可运行的config.txt答案 0 :(得分：0)
好吧，我想我有和你一样的套装，RPi 3和7＆＃39;＆＃39;显示Waveshare以及短而扁平的HDMI线缆。我只是尝试用AT 0.5.1开始这个套件并且它工作正常（首先它显示了人工制品，线条并且似乎被破坏了，但几秒钟之后我可以看到Android Things开始屏幕）。我按照Android Things site上的说明进行安装。如果您阅读0.5.1的release notes，则有以下内容：
自动检测Raspberry Pi 3上的显示设置，无需编辑root config.txt文件。
但是我为你复制了我的（自动生成的）config.txt：
kernel=u-boot-dtok.bin
framebuffer_depth=16
# Prevent the firmware from loading HAT overlays now that we handle pin muxing.
# ourselves. See:
# https://www.raspberrypi.org/documentation/configuration/device-tree.md#part3.4
dtoverlay=
dtparam=i2c_arm=on
dtparam=spi=on
dtparam=audio=on
# pwm and I2S are mutually-exclusive since they share hardware clocks.
dtoverlay=pwm-2chan-with-clk,pin=18,func=2,pin2=13,func2=4
dtoverlay=generic-i2s
start_x=1
# Tell U-boot to always use the "serial0" interface for the console, which is
# set to whichever uart (uart0 or uart1) is set to the header pins. This doesn't
# interfere with the uart selected for Bluetooth.
dtoverlay=chosen-serial0
# Enable skip-init on the UART interfaces, so U-Boot doesn't attempt to
# re-initialize them.
dtoverlay=rpi-uart-skip-init
# Add pin devices to the system for use by the runtime pin configuration driver.
dtoverlay=runtimepinconfig
dtoverlay=uart1
dtoverlay=bcm2710-rpi-3-b-spi0-pin-reorder
# Tell the I2S driver to use the cprman clock.
dtoverlay=bcm2710-rpi-3-b-i2s-use-cprman
# Uncomment to disable serial port on headers, use GPIO14 and GPIO15
# as gpios and to allow the core_freq to change at runtime.
enable_uart=1
core_freq=400
# Enable hardware graphics acceleration.
dtoverlay=vc4-kms-v3d,cma-256
mask_gpu_interrupt0=0x400
avoid_warnings=2
# Support official RPi display.
dtoverlay=i2c-rtc,ds3231
dtoverlay=rpi-ft5406
hdmi_force_hotplug=1
hdmi_drive=2
我希望它有所帮助。
答案 1 :(得分：0)
有时我设法让显示器运行（使用新格式化的图像和我上面发布的config.txt）......但有时显示器停止工作......然后我收到此日志消息
1-01 00:00:18.553 311-334/? I/DisplayManagerService: Display device added: DisplayDeviceInfo{"Built-in Screen": uniqueId="local:0", 16 x 16, modeId 1, defaultModeId 1, supportedModes [{id=1, width=16, height=16, fps=1.0}], colorMode 0, supportedColorModes [0], HdrCapabilities android.view.Display$HdrCapabilities@1d6308, density 240, 96.0 x 96.0 dpi, appVsyncOff 1000000, presDeadline 1000000000, touch INTERNAL, rotation 0, type BUILT_IN, state UNKNOWN, FLAG_DEFAULT_DISPLAY, FLAG_ROTATES_WITH_CONTENT, FLAG_SECURE, FLAG_SUPPORTS_PROTECTED_BUFFERS}
然后没有其他显示器（如我的显示器或我的电视）也不再工作了。
如果检测到显示，我收到此消息：
01-01 00:00:18.591 310-332/? I/DisplayManagerService: Display device added: DisplayDeviceInfo{"Built-in Screen": uniqueId="local:0", 1024 x 600, modeId 1, defaultModeId 1, supportedModes [{id=1, width=1024, height=600, fps=43.0}], colorMode 0, supportedColorModes [0], HdrCapabilities android.view.Display$HdrCapabilities@1d6308, density 240, 173.397 x 152.4 dpi, appVsyncOff 1000000, presDeadline 23255814, touch INTERNAL, rotation 0, type BUILT_IN, state UNKNOWN, FLAG_DEFAULT_DISPLAY, FLAG_ROTATES_WITH_CONTENT, FLAG_SECURE, FLAG_SUPPORTS_PROTECTED_BUFFERS}
我认为这是Android Things中的一个错误，希望这将在下一个版本中修复！
如果我有任何更新，我会更新这篇文章。
答案 2 :(得分：-1)