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Android fastboot flash recovery error in Linux:

on April 05, 2013

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Try to use sudo to give your fastboot root privilege, then your fastboot can access to the device.

ADB Android

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How to add/edit/change files in Android APK file?

How to modify files which are already packaged into a apk file? For example, you want to change some configuration but don't want to rebuild the project again. I found the aapt command is pretty useful. For example, I want to change user_info.txt in assets folder, I can do like this: aapt remove -v yourapkfile.apk assets/user_info.txt aapt add -v yourapkfile.apk assets/user_info.txt But, if you modify any file inside a signed APK file, you need to sign it again so that it can be installed. You can sign your apk file by using jarsigner, for example, jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore yourkeystore.file $1 alias <<< password

Python Fibonacci

Untitled In [1]: def fib ( n ): if n < 2 : return n return fib ( n - 1 ) + fib ( n - 2 ) In [2]: % timeit fib(20) 3.72 ms ± 140 µs per loop (mean ± std. dev. of 7 runs, 100 loops each) In [2]: % load_ext Cython In [3]: %% cython def fib_cython ( n ): if n < 2 : return n return fib_cython ( n - 1 ) + fib_cython ( n - 2 ) In [4]: % timeit fib_cython(20) 1.25 ms ± 8.76 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each) In [5]: from functools import lru_cache as cache @cache ( maxsize = None ) def fib_cache ( n ): if n < 2 : return n return fib_cache ( n - 1 ) + fib_cache ( n - 2 ) In [6]: % timeit fib_cache(20) 138 ns ± 0.655 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

Android tcpdump problem: permission denied.

The most possible reason is that you never gave tcpdump execute permission. Try (as root) chmod 555 tcpdump

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Android fastboot flash recovery error in Linux:

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