Android開發：操作文件工具類封裝

import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.content.res.AssetManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.text.TextUtils;

import com.crlgc.nofire.base.App;


import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.text.Collator;
import java.text.DecimalFormat;
import java.util.Comparator;
import java.util.Locale;


public class FileUtils {

    public static String getAppBasePath() {
        String path =