Andong's Technical Blog

Search This Blog

A easy way to view binary file in hex in linux

on July 23, 2015

Get link
Facebook
X
Pinterest
Email
Other Apps

If you use vim, that is pretty easy, you can

vim your_binary_file

click "Esc", and then type ":%!xxd"; type ":%!xxd -r" to return to normal mode.

linux vim

Get link
Facebook
X
Pinterest
Email
Other Apps

Comments

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

Android: mv src dst -- cross-device link

I don't know why mv does not work in adb shell, but we can use cat instead: cat src > dst

Better to add some delay before starting service from BootReceiver

Many Android apps need to restart its services when the phone just rebooted. For example, the following code from " Learning Android " -- P162: public class BootReceiver extends BroadcastReceiver { // @Override public void onReceive(Context context, Intent intent) { // context.startService(new Intent(context, UpdaterService.class)); (1)// Log.d("BootReceiver", "onReceived"); } } While, I suggestion to delay several seconds, e.g., 10 seconds, before running the (1) line, which is more stable for different phones and services. For example, in my case, my service is going to write sd card. If you start your service immediately, some phones may fail because the sd card is not ready. (my app works well on Galaxy Nexus but fails on Droid. The error is java.io.filenotfoundexception: permission denied .) To add several-second-delay, you can do like this: Timer timer = new Timer (); timer . schedule ( new TimerTask () { ...

Powered by Blogger

A easy way to view binary file in hex in linux

Comments

Post a Comment