Android Support Library Annotations framework technology original understanding

Android Support Library Annotations (Android support library betting) is a framework technology in Android development. It provides a way to add annotations to the code to help developers conduct and optimize in programming and development. Android Support Library Annotations provides some predetermined annotations that enable developers to mark and describe elements (such as classes, methods, variables, etc.) in Android applications.These annotations can be used to tell compilers and other development tools how to deal with these elements during code compilation and runtime.By using these annotations, developers can achieve better code reuse, error check and code optimization. Here 1. @nulLABLE and @Nonnull: Whether these two annotations are used for the return value or parameter for marking methods may be NULL.@NULLABLE indicates that the value may be null, and @nonnull means that the value cannot be null.By using these annotations in the code, developers can detect potential empty pointer abnormalities during compilation. @Nullable public String getName() { // Method implementation } public void setName(@NonNull String name) { // Method implementation } 2. @intrange and @FloatRange: These two annotations are used to limit the range of the equal or floating -point number type parameters.By using these annotations, developers can detect whether the parameter values exceed the range during compilation. public void setAge(@IntRange(from = 0, to = 100) int age) { // Method implementation } public void setPrice(@FloatRange(from = 0.0, to = 1000.0) float price) { // Method implementation } 3. @SuppressLint: This annotation is used to tell the Lint tool not to warn or error checks on a specific code.By using this annotation, developers can disable the Lint tool inspection in some specific conditions in the code. @SuppressLint("MethodName") public void methodName() { // Method implementation } Android SUPPORT LIBARARY Annotations also provides some other annotations, such as @maintHread (the labeling method should be called in the main thread),@wormread (the label method should be called in the work thread), etc., you can choose to use according to specific development needs. In short, Android Support Library Annotions is a framework technology for more detailed description and labeling of the Android code.By using these annotations, developers can improve programming efficiency, reduce the probability of errors, and optimize the performance of the code.