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Android tcpdump problem: permission denied.

on February 15, 2013

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The most possible reason is that you never gave tcpdump execute permission.

Try (as root) chmod 555 tcpdump

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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

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 () { ...

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Android tcpdump problem: permission denied.

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