Android获取本机各种类型文件列表（音乐、视频，作为字节跳动面试官-Toy模板网

这篇具有很好参考价值的文章主要介绍了Android获取本机各种类型文件列表（音乐、视频，作为字节跳动面试官。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

获取视频列表

/**

获取本机视频列表
@return
*/
public List getVideos() {

List videos = new ArrayList();

Cursor c = null;
try {
// String[] mediaColumns = { “_id”, “_data”, “_display_name”,
// “_size”, “date_modified”, “duration”, “resolution” };
c = mContentResolver.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Video.Media.DEFAULT_SORT_ORDER);
while (c.moveToNext()) {
String path = c.getString(c.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));// 路径
if (!FileUtils.isExists(path)) {
continue;
}

int id = c.getInt(c.getColumnIndexOrThrow(MediaStore.Video.Media._ID));// 视频的id
String name = c.getString(c.getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME)); // 视频名称
String resolution = c.getString(c.getColumnIndexOrThrow(MediaStore.Video.Media.RESOLUTION)); //分辨率
long size = c.getLong(c.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE));// 大小
long duration = c.getLong(c.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION));// 时长
long date = c.getLong(c.getColumnIndexOrThrow(MediaStore.Video.Media.DATE_MODIFIED));//修改时间

Video video = new Video(id, path, name, resolution, size, date, duration);
videos.add(video);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (c != null) {
c.close();
}
}
return videos;
}

其中，视频的bean类Video代码为：

public class Video {
private int id = 0;
private String path = null;
private String name = null;
private String resolution = null;// 分辨率
private long size = 0;
private long date = 0;
private long duration = 0;

public Video(int id, String path, String name, String resolution, long size, long date, long duration) {
this.id = id;
this.path = path;
this.name = name;
this.resolution = resolution;
this.size = size;
this.date = date;
this.duration = duration;
}

… //此处省略setter和getter方法
｝

通过本地视频id获取视频缩略图

// 获取视频缩略图
public Bitmap getVideoThumbnail(int id) {
Bitmap bitmap = null;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inDither = false;
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
bitmap = MediaStore.Video.Thumbnails.getThumbnail(mContentResolver, id, MediaStore.Images.Thumbnails.MICRO_KIND, options);
return bitmap;
}

上面获取视频列表的方法中，Video对象中有一个属性是id，通过传入这个id可以获取到视频缩略图的Bitmap对象。

获取本机所有图片文件夹

/**

得到图片文件夹集合
*/
public List getImageFolders() {
List folders = new ArrayList();
// 扫描图片
Cursor c = null;
try {
c = mContentResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null,
MediaStore.Images.Media.MIME_TYPE + "= ? or " + MediaStore.Images.Media.MIME_TYPE + “= ?”,
new String[]{“image/jpeg”, “image/png”}, MediaStore.Images.Media.DATE_MODIFIED);
List mDirs = new ArrayList();//用于保存已经添加过的文件夹目录
while (c.moveToNext()) {
String path = c.getString(c.getColumnIndex(MediaStore.Images.Media.DATA));// 路径
File parentFile = new File(path).getParentFile();
if (parentFile == null)
continue;

String dir = parentFile.getAbsolutePath();
if (mDirs.contains(dir))//如果已经添加过
continue;

mDirs.add(dir);//添加到保存目录的集合中
ImgFolderBean folderBean = new ImgFolderBean();
folderBean.setDir(dir);
folderBean.setFistImgPath(path);
if (parentFile.list() == null)
continue;
int count = parentFile.list(new FilenameFilter() {
@Override
public boolean accept(File dir, String filename) {
if (filename.endsWith(“.jpeg”) || filename.endsWith(“.jpg”) || filename.endsWith(“.png”)) {
return true;
}
return false;
}
}).length;

folderBean.setCount(count);
folders.add(folderBean);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (c != null) {
c.close();
}
}

return folders;
}

其中，图片文件夹的bean类ImgFolderBean代码为:

public class ImgFolderBean {
/*当前文件夹的路径/
private String dir;
/*第一张图片的路径，用于做文件夹的封面图片/
private String fistImgPath;
/*文件夹名/
private String name;
/*文件夹中图片的数量/
private int count;

public ImgFolderBean(String dir, String fistImgPath, String name, int count) {
this.dir = dir;
this.fistImgPath = fistImgPath;
this.name = name;
this.count = count;
}

… //此处省略setter和getter方法
}

获取图片文件夹下的图片路径的集合

/**

通过图片文件夹的路径获取该目录下的图片
*/
public List getImgListByDir(String dir) {
ArrayList imgPaths = new ArrayList<>();
File directory = new File(dir);
if (directory == null || !directory.exists()) {
return imgPaths;
}
File[] files = directory.listFiles();
for (File file : files) {
String path = file.getAbsolutePath();
if (FileUtils.isPicFile(path)) {
imgPaths.add(path);
}
}
return imgPaths;
}

获取本机已安装应用列表

/**

获取已安装apk的列表
*/
public List getAppInfos() {

ArrayList appInfos = new ArrayList();
//获取到包的管理者
PackageManager packageManager = mContext.getPackageManager();
//获得所有的安装包
List installedPackages = packageManager.getInstalledPackages(0);

//遍历每个安装包，获取对应的信息
for (PackageInfo packageInfo : installedPackages) {

AppInfo appInfo = new AppInfo();

appInfo.setApplicationInfo(packageInfo.applicationInfo);
appInfo.setVersionCode(packageInfo.versionCode);

//得到icon
Drawable drawable = packageInfo.applicationInfo.loadIcon(packageManager);
appInfo.setIcon(drawable);

//得到程序的名字
String apkName = packageInfo.applicationInfo.loadLabel(packageManager).toString();
appInfo.setApkName(apkName);

//得到程序的包名
String packageName = packageInfo.packageName;
appInfo.setApkPackageName(packageName);

//得到程序的资源文件夹
String sourceDir = packageInfo.applicationInfo.sourceDir;
File file = new File(sourceDir);
//得到apk的大小
long size = file.length();
appInfo.setApkSize(size);

System.out.println(“---------------------------”);
System.out.println(“程序的名字:” + apkName);
System.out.println(“程序的包名:” + packageName);
System.out.println(“程序的大小:” + size);

//获取到安装应用程序的标记
int flags = packageInfo.applicationInfo.flags;

if ((flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
//表示系统app
appInfo.setIsUserApp(false);
} else {
//表示用户app
appInfo.setIsUserApp(true);
}

if ((flags & ApplicationInfo.FLAG_EXTERNAL_STORAGE) != 0) {
//表示在sd卡
appInfo.setIsRom(false);
} else {
//表示内存
appInfo.setIsRom(true);
}

appInfos.add(appInfo);
}
return appInfos;
}

其中，安装包信息的bean类AppInfo代码为：

public class AppInfo {
private ApplicationInfo applicationInfo;
private int versionCode = 0;
/**