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Performance optimization is one of the most important goals every application developer wants to pursue, regardless of whether the application is for a general desktop Windows computer or an Android device. Android is a resource-limited system, and it therefore requires very strict resource utilization. Compared with a desktop system, performance optimization for Android applications is far more critical.

The previous chapter introduced the basic principles of performance optimization, optimization methods, and related tools for Android application development. Because Java is the recommended application development language for Android developers, the optimization tools presented in Chapter 11 were mainly for Java. However, C/C++ development shouldn’t be excluded from Android app development. This chapter introduce the Android NDK for C/C++ application development along with related optimization methods and optimization tools.

Unlike general-purpose computers that use an AC power supply, not all mobile devices can be directly connected to AC power; it cannot be assumed that the power supply is inexhaustible. In addition, heat dissipation must be considered for mobile devices. If power consumption is too high, it requires the system to increase heat dissipation, and at some point it may reach a point where this is not allowed. Due to strict constraints on the system’s overall power consumption, , commonly known as , is an important element of applications for mobile devices; in many cases it is a rigid requirement or the basis for survival. For example, it would be difficult to imagine a mobile phone the market would accept that could support only a few hours’ time.