ADB Shell:错误:未知的命令:执行adb shell时的显示密度显示密度?

我正在运行Linux Mint,连接的设备是一个ZTE HSUSB,它运行在Android v4.1.2上。

屏幕重新resize的命令似乎工作:我执行adb shell am display-size 640x480 ,它正确地调整了屏幕的大小。

但是,当我试图调整屏幕密度,我得到了adb shell am display-density 160

 administrator-LenovoPC ~ # adb shell am display-density 160 usage: am [subcommand] [options] usage: am start [-D] [-W] [-P <FILE>] [--start-profiler <FILE>] [--R COUNT] [-S] [--opengl-trace] <INTENT> am startservice <INTENT> am force-stop <PACKAGE> am kill <PACKAGE> am kill-all am broadcast <INTENT> am instrument [-r] [-e <NAME> <VALUE>] [-p <FILE>] [-w] [--no-window-animation] <COMPONENT> am profile start <PROCESS> <FILE> am profile stop [<PROCESS>] am dumpheap [flags] <PROCESS> <FILE> am set-debug-app [-w] [--persistent] <PACKAGE> am clear-debug-app am monitor [--gdb <port>] am screen-compat [on|off] <PACKAGE> am display-size [reset|MxN] am to-uri [INTENT] am to-intent-uri [INTENT] am start: start an Activity. Options are: -D: enable debugging -W: wait for launch to complete --start-profiler <FILE>: start profiler and send results to <FILE> -P <FILE>: like above, but profiling stops when app goes idle -R: repeat the activity launch <COUNT> times. Prior to each repeat, the top activity will be finished. -S: force stop the target app before starting the activity --opengl-trace: enable tracing of OpenGL functions am startservice: start a Service. am force-stop: force stop everything associated with <PACKAGE>. am kill: Kill all processes associated with <PACKAGE>. Only kills. processes that are safe to kill -- that is, will not impact the user experience. am kill-all: Kill all background processes. am broadcast: send a broadcast Intent. am instrument: start an Instrumentation. Typically this target <COMPONENT> is the form <TEST_PACKAGE>/<RUNNER_CLASS>. Options are: -r: print raw results (otherwise decode REPORT_KEY_STREAMRESULT). Use with [-e perf true] to generate raw output for performance measurements. -e <NAME> <VALUE>: set argument <NAME> to <VALUE>. For test runners a common form is [-e <testrunner_flag> <value>[,<value>...]]. -p <FILE>: write profiling data to <FILE> -w: wait for instrumentation to finish before returning. Required for test runners. --no-window-animation: turn off window animations will running. am profile: start and stop profiler on a process. am dumpheap: dump the heap of a process. Options are: -n: dump native heap instead of managed heap am set-debug-app: set application <PACKAGE> to debug. Options are: -w: wait for debugger when application starts --persistent: retain this value am clear-debug-app: clear the previously set-debug-app. am monitor: start monitoring for crashes or ANRs. --gdb: start gdbserv on the given port at crash/ANR am screen-compat: control screen compatibility mode of <PACKAGE>. am display-size: override display size. am to-uri: print the given Intent specification as a URI. am to-intent-uri: print the given Intent specification as an intent: URI. <INTENT> specifications include these flags and arguments: [-a <ACTION>] [-d <DATA_URI>] [-t <MIME_TYPE>] [-c <CATEGORY> [-c <CATEGORY>] ...] [-e|--es <EXTRA_KEY> <EXTRA_STRING_VALUE> ...] [--esn <EXTRA_KEY> ...] [--ez <EXTRA_KEY> <EXTRA_BOOLEAN_VALUE> ...] [--ei <EXTRA_KEY> <EXTRA_INT_VALUE> ...] [--el <EXTRA_KEY> <EXTRA_LONG_VALUE> ...] [--ef <EXTRA_KEY> <EXTRA_FLOAT_VALUE> ...] [--eu <EXTRA_KEY> <EXTRA_URI_VALUE> ...] [--ecn <EXTRA_KEY> <EXTRA_COMPONENT_NAME_VALUE>] [--eia <EXTRA_KEY> <EXTRA_INT_VALUE>[,<EXTRA_INT_VALUE...]] [--ela <EXTRA_KEY> <EXTRA_LONG_VALUE>[,<EXTRA_LONG_VALUE...]] [--efa <EXTRA_KEY> <EXTRA_FLOAT_VALUE>[,<EXTRA_FLOAT_VALUE...]] [-n <COMPONENT>] [-f <FLAGS>] [--grant-read-uri-permission] [--grant-write-uri-permission] [--debug-log-resolution] [--exclude-stopped-packages] [--include-stopped-packages] [--activity-brought-to-front] [--activity-clear-top] [--activity-clear-when-task-reset] [--activity-exclude-from-recents] [--activity-launched-from-history] [--activity-multiple-task] [--activity-no-animation] [--activity-no-history] [--activity-no-user-action] [--activity-previous-is-top] [--activity-reorder-to-front] [--activity-reset-task-if-needed] [--activity-single-top] [--activity-clear-task] [--activity-task-on-home] [--receiver-registered-only] [--receiver-replace-pending] [--selector] [<URI> | <PACKAGE> | <COMPONENT>] Error: Unknown command: display-density 

有没有人知道这个原因,以及如何解决?