Where's back slash on Android keyboard

Keys

A smartphone, like every telephone, needs buttons to operate. However, since there is a very large number of devices with the Android operating system, manufacturers must adhere to a number of specifications regarding the control buttons in order to ensure compatibility with Android. That's why there are three navigation buttons on every Android smartphone and tablet.

Power button [edit | edit source]

This button is used to switch the device on and off when pressed for a longer period of time. A single press locks the screen and turns it off (standby mode). From standby mode, you can use the power button and usually any physical buttons to get to the lock screen, where you can unlock the screen again.

Mandatory navigation keys [edit | edit source]

The following three buttons should be in a prominent position on every Android device, either as physical buttons (Hardware buttons that you can push in can), touch panel (touch-sensitive surface) or symbol on the touch screen (often with newer tablets).[1] Operation via these buttons makes using an Android device very intuitive and fast. In addition, the user finds z. B. when buying a new / different smartphone with Android in a familiar environment, because the operation is exactly the same as with his previous device.

Home button [edit | edit source]

The home button is usually the most noticeable button on an Android device and is located either as a physical button without a label in the middle or as a button with a house symbol under the other navigation buttons.

If this button is pressed, the active application continues to run in the background and you get to the home screen of the launcher. If you press the button longer (approx. 1 second), a selection of the most recently used apps appears. So you can use several applications at the same time and switch between active applications.

Recent applications button [edit | edit source]

The Recent Applications button is largely self-explanatory; on many devices it shows an icon of a window. The current applications are displayed here at the push of a button. In this view you can jump back and forth between applications or close them.

On some devices, a longer press on the application button activates the split-screen view, in which you can use 2 apps at the same time.

Back button [edit | edit source]

The back key is usually the most important navigation key and is often represented by a (round) arrow pointing to the left. In most cases, pressing this key takes you from one screen view to the last one, e.g. B. from the submenu to the main menu of an application. If you are back at the first view of an application (e.g. main menu) by pressing several times, this is often ended by pressing it again, but many apps then continue to run in the background and can only be completely closed by a task manager. Some games also use this button to pause the current game.

The CustomROMCyanogenMod offers an option to close applications completely by pressing the back button for a longer period of time.

Optional buttons [edit | edit source]

Many manufacturers equip their products with additional buttons, including:

  • Volume buttons: To adjust the ringtone or media volume; can also be used by apps.
  • Search: Usually as a magnifying glass symbol to call up the search.
  • Hardware keyboard: Complete keyboard made up of physical keys.
  • Trackball / joystick / direction buttons: rarely found, but useful for navigating in text, playing games, etc.

Activate / deactivate display keys (soft keys / on-screen buttons) [edit | edit source]

From Android 4000! 4.0 "Ice Cream Sandwich" the navigation buttons can be shown directly on the display. There is usually no option in the settings for activating / deactivating. However, there are several options, the first of which (editing the file) should work on all devices.

Edit the file /system/build.prop[edit | edit source]

You can activate / deactivate this by adding the entry to the file or changing the entry (a restart is required afterwards). Administrator rights are required for this, so the smartphone must be rooted. There are several ways to edit the file:

With a file manager with administrator rights [edit | edit source]

Open the path with a file manager (with root rights) and change the file with a text editor.

File managers with administrator rights are e.g. root browsers or Root Explorer .

If the following line does not yet exist, it must be inserted (e.g. simply goes into the file as the last line):

The number at the end stands for activated (0) or deactivated (1) display keys.

After changing the file, the system must be restarted.

With the Android Debug Bridge (ADB) [edit | edit source]

If you do not want to install a file manager with administrator rights / root explorer on your smartphone, you can also copy the file from your smartphone to your computer, change it there with an editor and then copy it back to the device.

To do this, you first go to the ADB shell, obtain administrator rights and copy the file from the directory to the SD card in order to then copy it from the SD card to the computer in the next step (this detour is necessary because the Rights management is not allowed directly from the computer[2]).

adb shell su cp /system/build.prop /storage/sdcard0/build.prop

Exit the ADB shell (e.g. with the key combination CTRL + D) or by entering twice and confirming with ENTER.

The file will now be copied from the SD card of the smartphone to the computer.

Note to the path information: If you under Linux works you specify the paths with a slash. In the following example, the file would be copied directly into the root directory of the current user (). Under Windows paths are given with a backslash, e.g..

adb pull /storage/sdcard0/build.prop / home / $ USER /

The file can now be opened on the computer with an editor and changed (i.e. either change the value from; from to to activate the buttons on the display or, if the entry does not yet exist in the file, insert the line)

then possibly:

adb shell rm /storage/sdcard0/build.prop

The edited file is now copied from the computer to the SD card

adb push /home/$USER/test/build.prop / storage / sdcard0 /

Now go back to the ADB shell and copy the file from the SD card. For this action it is necessary to mount the folder so that it can be briefly written (rw = read, write) and then change it back to read only (ro, read only).

adb shell su mount -o remount, rw / system cp /storage/sdcard0/build.prop /system/build.prop mount -o remount, ro / system

For the changes to take effect, Android must be restarted, which can also be done directly via the ADB shell at this point:

reboot

Individual evidence [edit | edit source]