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JAR files contain Java bytecode. Android devices do not execute this bytecode. Instead, Java classes are compiled into a proprietary bytecode format and executed by the Dalvik virtual machine, a register-based architecture designed to use less space. It is also optimized to use 32-bit indexes to speed up app loading and execution. To add Java …

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A digital barometer, like the one found in your smartphone, uses the same principles as a traditional aneroid, but replaces mechanical parts with a pressure-sensing transducer. It is also very useful for improving the elevation data provided by your phone’s GPS, as atmospheric pressure is directly proportional to elevation. Moreover, this feature can help you …

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