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TestCard is a simple screen test pattern for Android devices.
The app displays test patterns which are intended to let you see the structure of individual pixels, and the effect that has on the overall quality of the display. On many devices, the display will be utterly uninteresting
LED Flashlight Torch - Free is a free handy torch app for your android device. No need to find battery torch anymore just grab your android device and make it torch with this cool app. The app uses the camera light as a flashlight. You can also use your camera flashlight when the area is dark or dim light.
FEATURES:
Use Camera LED Flashlight as Torch
Screen On - This Android application will keep the screen on, when an application of those you have selected in the list is running. It periodically checks to find if the application is running and locks the screen not to sleep. When the application stops, the lock goes off.
Screen on when charge option
Blinking Flashlight - Simple flashlight when you need it - automatically sets brightness to max and lights up your screen to the maximum.
But you can also set it to blinking mode w/ glowing/pulsating colors, strobo mode for ultimate impact and sensors mode, which reacts to your movement
Magnifying Glass - This app is a Magnifying Glass for Android! Simple, no frills. Tested on Galaxy S II. Magnifying Glass uses your front facing camera with a macro focus mode and full digital zoom
SuperDim - This requires root privileges on your device and a backlit LCD screen (not OLED).
SuperDim lets you dim the display to very low levels--lower than the OS normally allows (that's why you need root privileges)--to save night vision. This will be particularly useful for serious amateur astronomers.
On some devices you can also turn off LEDs (e.g., power LED)
Screen On Toggler is basically a replacement tool for the default search button on your Android phone when you long press it. It allows you to quickly toggle your screen's timeout from always ON to your screen timeout's setting and vice versa.
Once installed, press and hold the search button on your android phone and a dialog will appear