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Is it possible to enable a driving mode like that found on the Galaxy S phones when the user presses a button?
Or is this not built into all android phones?
You can create such a "mode" using Tasker (found in the Play Store). Basically you set up actions that occur based on certain events (such as a button press). Actions include changing brightness/volume settings, triggering apps etc...
For example, I created a button that sets me "Available"/"Unavailale" for phone calls - it doesn't just turn the ringer off, it shoots the callers right to VM...
It takes a bit of work (and isn't free), but Tasker is pretty powerful & you can typically find help online fairly easily.
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I am new to android. I am currently looking for developing a android application which quickly needs to enable my application.
It may be pressing a power button or volume button in a specific pattern or taping the screen continuously.
I doesn't want to use the screen light on or off since it activates my application for some random reason.
Android does not have a built in feature that lets you run an application by pressing the hardware keys.
A possible solution would be to run a service that intercept the volume keys (https://stackoverflow.com/a/7130685/2804473). This solution will probably be too intrusive for the end user though.
I would not recommend your proposed idea. Instead, play by the given "rules" that the Android environment provides. You might want to use a Widget instead? If the hardware-trigger is that important, maybe you should take a look at accessories such as Pressy (https://play.google.com/store/apps/details?id=com.pressy.app) or similar?
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Here's the scenario:
Phone's battery is dead.
You go to plug in the phone.
From here, I'd like the phone to automatically turn itself ON once it detects a power source.
What's the best way to do this? Is there an android solution or would this take a custom ROM or something lower-level?
This could be done only on hardware level. No software could power up phone if it is truly off - not in sleep or any other passive state.
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I experienced something weird on my Android tablet. It had been turned off for several weeks and then when I turned it on, it rebooted. Previously, it was just in sleep (standby) mode. But after rebooting, I noticed that the entire device was reset to its factory defaults. All my apps were gone and everything wiped.
Then a few days later I rebooted the device and was surprised to see that all my apps were back again and everything restored as it was. I don't use any backup/restore software, so I am really curious to know how this could happen? Does Android support multiple user profiles? If multiple boot profiles is supported, can this be utilized by an app through some API?
Android does not currently support multiple (simultaneous) user profiles. If you do want to achieve this, there is an app that supports it (perhaps more than one), but it involves having a rooted device.
I have personally used this on my home tablet, and it works quite nicely, but requires a reboot to access the other profiles.
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I was looking for an app for phones (iPhone, Android and SmartPhone - any or all) that would simply run in the background and place any scanned upc code digits into the currently active textbox.
I've Googled for quite a while and only found an Android app that actually replaces the keyboard of the phone.
It seems like it should be easy (I have many for PCs) but I haven't done any handheld programming since Windows CE days so I don't know if this is possible (can apps see other apps controls in these phones).
Has anyone ever come across an app like this?
use the iphone sdk from zbar and you can do it inside your app.
You cannot do this system wide. You can only add this functionality to your apps.
This question is very similar Take a look. Android Long Press on Edit Text behavior
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I am looking at locking down several Android Tablets (Samsung Galaxy tab) to allow the user to unlock the device and be sent straight into one application and not allowed to leave. I was wondering if this is possible without creating a custom ROM and if so how? Any help is greatly appreciated
You might try creating a custom launcher and see how far that gets you. I don't think it will be bulletproof but by adding some hacks like having it auto-launch a specific app, it's probably about as far as you can get without a custom ROM. See here for the code of the stock Android launcher:
https://android.googlesource.com/platform/packages/apps/Launcher/+/master/src/com/android/launcher/Launcher.java
You could create an app that is more or less "non-exitable" by overriding the hardware buttons' default behaviour in your application.
Although if your app crashes and doesn't automatically restart after a crash, the user has full access to the rest of the system.