this demo主要是实现了一个简单的loaddingview用于加载imageview，然后长按图片保存至相册，刷新相册 Add it in your root build.gradle at the end of repositories:

allprojects {
	repositories {
		...
		maven { url 'https://jitpack.io' }
	}
}

Step 2. Add the dependency

dependencies {
        compile 'com.github.913453448:CamerRoll:1.0'
}