支持 Assets 下的文件或者文件夹拷贝到手机存储
public static void copyAssetsDirToSDCard(Context context, String assetsDirName, String sdCardPath) {
Log.d(TAG, copyAssetsDirToSDCard() called with: context = [ + context + ], assetsDirName = [ + assetsDirName + ], sdCardPath = [ + sdCardPath + ]);
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