Android文件操作实用工具类-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_26331411/article/details/105521002
package com.tal.jxtteacher.utils;

import android.app.Activity;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.StatFs;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.annotation.RequiresApi;
import android.util.Log;

import com.tal.jxtteacher.DemoApplication;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public class FileUtils {

    private static final String TAG = "FileUtil";
    private static String pathDiv = "/";
    private static File cacheDir = !isExternalStorageWritable()?DemoApplication.getInstance().getFilesDir(): DemoApplication.getInstance().getExternalCacheDir();
    // SD卡目录
    public static final String SD_PATH = Environment.getExternalStorageDirectory().getAbsolutePath() + "/";

    private FileUtils() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    public static String getPhotoSubjectPath(){
        String files = SD_PATH + "jiaxiaotong/";
        File file = new File(files);
        if (!file.exists()){
            file.mkdirs();
        }
        return file.getAbsolutePath();
    }

    /**
     * 创建临时文件
     *
     * @param type 文件类型
     */
    public static File getTempFile(FileType type){
        try{
            File file = File.createTempFile(type.toString(), null, cacheDir);
            file.deleteOnExit();
            return file;
        }catch (IOException e){
            return null;
        }
    }


    /**
     * 获取缓存文件地址
     */
    public static String getCacheFilePath(String fileName){
        return cacheDir.getAbsolutePath()+pathDiv+fileName;
    }


    /**
     * 判断缓存文件是否存在
     */
    public static boolean isCacheFileExist(String fileName){
        File file = new File(getCacheFilePath(fileName));
        return file.exists();
    }

    /**
     * @param context
     * @return
     */
    public static String getDiskCacheDir(Context context) {
        String cachePath = null;
        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
                || !Environment.isExternalStorageRemovable()) {
            cachePath = context.getExternalCacheDir().getPath();
        } else {
            cachePath = context.getCacheDir().getPath();
        }
        return cachePath;
    }


    /***
     * 获取手机内部存储空间
     *
     * @param
     * @return
     */
    public static long getStorageSize(){
        File path = Environment.getExternalStorageDirectory();
        StatFs stat = new StatFs(path.getPath());
        long blockSize = stat.getBlockSize();
        long totalBlocks = stat.getBlockCount();
        long totalSize = totalBlocks * blockSize;

        return totalSize;
    }

    public static long getStorageAvailableSize(){
        File path = Environment.getExternalStorageDirectory();
        StatFs stat = new StatFs(path.getPath());
        long blockSize = stat.getBlockSize();
        long availableBlocks = stat.getAvailableBlocks();
        long availSize = availableBlocks * blockSize;

        return availSize;
    }



    /**
     * 将图片存储为文件
     *
     * @param bitmap 图片
     */
    public static String createFile(Bitmap bitmap, String filename){
        File f = new File(cacheDir, filename);
        try{
            if (f.createNewFile()){
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.PNG, 0, bos);
                byte[] bitmapdata = bos.toByteArray();
                FileOutputStream fos = new FileOutputStream(f);
                fos.write(bitmapdata);
                fos.flush();
                fos.close();
            }
        }catch (IOException e){
            Log.e(TAG,"create bitmap file error" + e);
        }
        if (f.exists()){
            return f.getAbsolutePath();
        }
        return null;
    }

    /**
     * 将数据存储为文件
     *
     * @param data 数据
     */
    public static void createFile(byte[] data,String filename){
        File f = new File(cacheDir, filename);
        try{
            if (f.createNewFile()){
                FileOutputStream fos = new FileOutputStream(f);
                fos.write(data);
                fos.flush();
                fos.close();
            }
        }catch (IOException e){
            Log.e(TAG,"create file error" + e);
        }
    }


    /**
     * 将数据存储为文件
     *
     * @param data 数据
     * @param fileName 文件名
     * @param type 文件类型
     */
    public static boolean createFile(byte[] data, String fileName, String type){
        if (isExternalStorageWritable()){
            File dir = DemoApplication.getInstance().getExternalFilesDir(type);
            if (dir != null){
                File f = new File(dir, fileName);
                try{
                    if (f.createNewFile()){
                        FileOutputStream fos = new FileOutputStream(f);
                        fos.write(data);
                        fos.flush();
                        fos.close();
                        return true;
                    }
                }catch (IOException e){
                    Log.e(TAG,"create file error" + e);
                    return false;
                }
            }
        }
        return false;
    }

    /**
     * 读取文件的最后修改时间的方法
     */
    public static String getFileLastModifiedTime(File f) {
        Calendar cal = Calendar.getInstance();
        long time = f.lastModified();
        SimpleDateFormat formatter = new
                SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        cal.setTimeInMillis(time);
        return formatter.format(cal.getTime());
    }


    public static String getDurationString(long duration) {
//        long days = duration / (1000 * 60 * 60 * 24);
        long hours = (duration % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60);
        long minutes = (duration % (1000 * 60 * 60)) / (1000 * 60);
        long seconds = (duration % (1000 * 60)) / 1000;

        String hourStr = (hours < 10) ? "0" + hours : hours + "";
        String minuteStr = (minutes < 10) ? "0" + minutes : minutes + "";
        String secondStr = (seconds < 10) ? "0" + seconds : seconds + "";

        if (hours != 0) {
            return hourStr + ":" + minuteStr + ":" + secondStr;
        } else {
            return minuteStr + ":" + secondStr;
        }
    }

    /**
     * 格式化单位
     *
     * @param
     * @return
     */
    public static String FormetFileSize(long fileS) {
        DecimalFormat df = new DecimalFormat("#.00");
        String fileSizeString = "";
        String wrongSize = "0B";
        if (fileS == 0) {
            return wrongSize;
        }
        if (fileS < 1024) {
            fileSizeString = df.format((double) fileS) + "B";
        } else if (fileS < 1048576) {
            fileSizeString = df.format((double) fileS / 1024) + "KB";
        } else if (fileS < 1073741824) {
            fileSizeString = df.format((double) fileS / 1048576) + "MB";
        } else {
            fileSizeString = df.format((double) fileS / 1073741824) + "GB";
        }
        return fileSizeString;
    }

    /**
     * 获取文件大小 文件夹也可以
     *
     * @param file
     * @return
     */
    public static long getFolderSize(File file) {
        long size = 0;
        try {
            File[] fileList = file.listFiles();
            for (int i = 0; i < fileList.length; i++) {
                if (fileList[i].isDirectory()) {
                    size = size + getFolderSize(fileList[i]);

                } else {
                    size = size + fileList[i].length();
                }
            }
        } catch (Exception e) {

            e.printStackTrace();
        }
        return size; // return size/1048576;
    }

    /**
     * 从URI获取图片文件地址
     *
     * @param context 上下文
     * @param uri 文件uri
     */
    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    public static String getImageFilePath(Context context, Uri uri) {
        if (uri == null) {
            return null;
        }
        String path = null;
        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
        if (isKitKat){
            if (!isMediaDocument(uri)){
                try{
                    final String docId = DocumentsContract.getDocumentId(uri);
                    final String[] split = docId.split(":");
                    Uri contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                    final String selection = "_id=?";
                    final String[] selectionArgs = new String[] {
                            split[1]
                    };
                    path = getDataColumn(context, contentUri, selection, selectionArgs);
                }catch (IllegalArgumentException e){
                    path = null;
                }
            }
        }
        if (path == null){
            String[] projection = {MediaStore.Images.Media.DATA};
            Cursor cursor = ((Activity) context).managedQuery(uri, projection, null, null, null);
            if (cursor != null) {
                int column_index = cursor
                        .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                cursor.moveToFirst();
                return cursor.getString(column_index);
            }

            path = null;
        }
        return path;
    }


    /**
     * 从URI获取文件地址
     *
     * @param context 上下文
     * @param uri 文件uri
     */
    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    public static String getFilePath(Context context, Uri uri) {
        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }

                // TODO handle non-primary volumes
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {

                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

                return getDataColumn(context, contentUri, null, null);
            }
            // MediaProvider
            else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }

                final String selection = "_id=?";
                final String[] selectionArgs = new String[] {
                        split[1]
                };

                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        }
        // MediaStore (and general)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {
            return getDataColumn(context, uri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }

        return null;
    }






    /**
     * Get the value of the data column for this Uri. This is useful for
     * MediaStore Uris, and other file-based ContentProviders.
     *
     * @param context The context.
     * @param uri The Uri to query.
     * @param selection (Optional) Filter used in the query.
     * @param selectionArgs (Optional) Selection arguments used in the query.
     * @return The value of the _data column, which is typically a file path.
     */
    private static String getDataColumn(Context context, Uri uri, String selection,
                                        String[] selectionArgs) {
        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {column};
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                final int index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }


    /**
     * 判断外部存储是否可用
     *
     */
    public static boolean isExternalStorageWritable() {
        String state = Environment.getExternalStorageState();
        if (Environment.MEDIA_MOUNTED.equals(state)) {
            return true;
        }
        Log.e(TAG, "ExternalStorage not mounted");
        return false;
    }

    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }



    public enum FileType{
        IMG,
        AUDIO,
        VIDEO,
        FILE,
    }
}