資源簡介
繪制一個運動的小球,小球有4個運動方向,分別是45度、135度、225度和315度。開始時小球位于任意位置,并以4個方向中的任意一個方向開始運動,當遇到區域邊緣(屏幕邊緣)時,以相反角度(鏡面反射)回彈。

代碼片段和文件信息
/*?AUTO-GENERATED?FILE.??DO?NOT?MODIFY.
?*
?*?This?class?was?automatically?generated?by?the
?*?gradle?plugin?from?the?resource?data?it?found.?It
?*?should?not?be?modified?by?hand.
?*/
package?android.arch.core;
public?final?class?R?{
????private?R()?{}
}
?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-10-19?19:15??Chapter\
?????文件?????????187??2018-10-19?19:15??Chapter\.gitignore
?????目錄???????????0??2018-10-19?19:15??Chapter\.gradle\
?????目錄???????????0??2018-10-19?19:25??Chapter\.gradle\4.6\
?????目錄???????????0??2018-10-19?19:15??Chapter\.gradle\4.6\fileChanges\
?????文件???????????1??2018-10-20?15:33??Chapter\.gradle\4.6\fileChanges\last-build.bin
?????目錄???????????0??2018-10-19?19:25??Chapter\.gradle\4.6\fileContent\
?????文件??????????17??2018-10-20?15:33??Chapter\.gradle\4.6\fileContent\fileContent.lock
?????目錄???????????0??2018-10-19?19:15??Chapter\.gradle\4.6\fileHashes\
?????文件??????154733??2018-10-20?15:02??Chapter\.gradle\4.6\fileHashes\fileHashes.bin
?????文件??????????17??2018-10-20?15:33??Chapter\.gradle\4.6\fileHashes\fileHashes.lock
?????文件???????19653??2018-10-19?19:25??Chapter\.gradle\4.6\fileHashes\resourceHashesCache.bin
?????目錄???????????0??2018-10-19?19:25??Chapter\.gradle\4.6\javaCompile\
?????文件??????650258??2018-10-20?15:02??Chapter\.gradle\4.6\javaCompile\classAnalysis.bin
?????文件??????248471??2018-10-19?19:25??Chapter\.gradle\4.6\javaCompile\jarAnalysis.bin
?????文件??????????17??2018-10-20?15:02??Chapter\.gradle\4.6\javaCompile\javaCompile.lock
?????文件??????626790??2018-10-20?15:02??Chapter\.gradle\4.6\javaCompile\taskHistory.bin
?????文件???????20967??2018-10-20?15:02??Chapter\.gradle\4.6\javaCompile\taskJars.bin
?????目錄???????????0??2018-10-19?19:15??Chapter\.gradle\4.6\taskHistory\
?????文件??????826160??2018-10-20?15:02??Chapter\.gradle\4.6\taskHistory\taskHistory.bin
?????文件??????????17??2018-10-20?15:33??Chapter\.gradle\4.6\taskHistory\taskHistory.lock
?????目錄???????????0??2018-10-19?19:15??Chapter\.gradle\buildOutputCleanup\
?????文件??????????17??2018-10-20?15:33??Chapter\.gradle\buildOutputCleanup\buildOutputCleanup.lock
?????文件??????????51??2018-10-19?19:15??Chapter\.gradle\buildOutputCleanup\cache.properties
?????文件???????20729??2018-10-20?15:02??Chapter\.gradle\buildOutputCleanup\outputFiles.bin
?????目錄???????????0??2018-10-19?19:15??Chapter\.gradle\vcsWorkingDirs\
?????文件???????????0??2018-10-19?19:15??Chapter\.gradle\vcsWorkingDirs\gc.properties
?????目錄???????????0??2018-10-20?19:19??Chapter\.idea\
?????目錄???????????0??2018-10-19?19:15??Chapter\.idea\caches\
?????文件?????????535??2018-10-20?13:14??Chapter\.idea\caches\build_file_checksums.ser
?????目錄???????????0??2018-10-19?19:15??Chapter\.idea\codest
............此處省略1231個文件信息
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