MUI-APP开发之mui框架封装获取文件方式

	
		
		
		
		
		

			
			
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其中njs-io.js文件如下所示

/**
 * 获得sd卡根目录
 */
function getSDRoot(){
	// 导入android.os.Environment类对象
	var environment = plus.android.importClass("android.os.Environment");
	// 判断SD卡是否插入
	if(environment.getExternalStorageState() !== environment.MEDIA_MOUNTED){
		plus.nativeUI.toast('没有找到SD卡');
		return;
	}
	console.log("获取 Android 数据目录:"+environment.getDataDirectory());
	console.log("获取 Android 下载/缓存内容目录:"+environment.getDownloadCacheDirectory());
	console.log("获取外部存储目录即 SDCard:"+environment.getExternalStorageDirectory());
	console.log("获取外部存储设备的当前状态:"+environment.getExternalStorageState());
	//console.log("获取 Android 的根目录:"+getRootDirectory());
	return environment.getExternalStorageDirectory();
}

/**
 * 创建文件夹
 * @param {Object} path
 */
function creatFolder(path){
	var File = plus.android.importClass("java.io.File");
	var fd = new File(path);
	if(!fd.exists()){
		fd.mkdirs();
		plus.nativeUI.toast("创建成功");
	}
}

/**
 *  删除文件(文件夹)
 * @param {Object} path
 */
function deleteFile(path){
	var File = plus.android.importClass("java.io.File");
	var fd = new File(path);
	if (fd != null && fd.exists()){
		fd.delete();
		plus.nativeUI.toast("删除成功");
	}		
}

/**
 * 读文件大小
 * @param {Object} file
 */
function readFileSize(file){
	var FileInputStream = plus.android.importClass("java.io.FileInputStream");
    var fileSize = new FileInputStream(file);
	var size = fileSize.available();
	var fileSizeString;
	if(size == 0){
		fileSizeString = "0B";
	}else if(size < 1024){
		fileSizeString = size + "B";
	}else if(size < 1048576){
		fileSizeString = (size/1024).toFixed(2) + "KB";
	}else if (size < 1073741824){
		fileSizeString = (size/1048576).toFixed(2) + "MB";
	}else{
		fileSizeString = (size/1073741824).toFixed(2) + "GB";
	}
	return fileSizeString;
}

/**
 * 读取文件夹下子文件夹及子文件数目
 * @param {Object} file
 */
function readSonFilenum(file){
	var subFile = plus.android.invoke(file,"listFiles");
	var subLen = subFile.length;
	var obj = {
		subFolderNum: 0,
		subFileNum: 0
	};
	for(var k=0;k