android文件操作相关的工具

迷南。 2022-06-10 14:19 156阅读 0赞

package com.sun.framework.Utils;
    
    import android.content.Context;
    
    import com.sun.framework.CustomizeVC.LaunchActivity;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.ObjectInputStream;
    import java.io.ObjectOutputStream;
    import java.io.OutputStream;
    import java.util.ArrayList;
    import java.util.List;
    
    
    public class FileUtils {
    
        private Context context;
        public String filePath;
    
        public FileUtils(Context context){
            this.context = context;
            filePath = context.getFilesDir().getAbsolutePath();
            filePath = filePath.replace("files","appCache"); // 路径：data/data/packageName/appCache/***
        }
    
    
        public boolean saveFileContent(Object obj, String fileName) {
            String Path = filePath+"/"+fileName;
            try {
                File file = new File(Path);
                if (!file.exists()) {
                    File dir = new File(file.getParent());
                    dir.mkdirs();
                    file.createNewFile();
                }
                FileOutputStream outStream = new FileOutputStream(file);
                ObjectOutputStream objectOutputStream = new ObjectOutputStream(outStream);
                objectOutputStream.writeObject(obj);
                outStream.close();
            } catch (Exception e) {
                e.printStackTrace();
                return false;
            }
            return true;
        }
    
        public Object  getFileObjectContent(String fileName) {
            String Path = filePath+"/"+fileName;
            Object obj = null;
            try {
                File file = new File(Path);
                if (file.exists()) {
                    FileInputStream inStram = new FileInputStream(file);
                    ObjectInputStream objectInputStream = new ObjectInputStream(inStram);
                    obj = objectInputStream.readObject();
                    inStram.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return obj;
        }
    
        public void saveFileContent(String str, String fileName) {
            String Path = filePath+"/"+fileName;
            try {
                File file = new File(Path);
                if (!file.exists()) {
                    File dir = new File(file.getParent());
                    dir.mkdirs();
                    file.createNewFile();
                }
                FileOutputStream outStream = new FileOutputStream(file);
                outStream.write(str.getBytes());
                outStream.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        public String getFileStringContent(String fileName) {
            String Path = filePath+"/"+fileName;
            String str = null;
            try {
                File file = new File(Path);
                if (file.exists()) {
                    FileInputStream inStram = new FileInputStream(file);
                    int length = inStram.available();
                    byte[] buffer = new byte[length];
                    inStram.read(buffer);
                    str = new String(buffer, "UTF-8");
                    inStram.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return str;
        }
    
        public List<String> getAllFileName() {
            List<String> list = new ArrayList<>();
            File fileTest = new File(filePath);
            File[] files = fileTest.listFiles();
            for (int i=0;i<files.length;i++){
                File file = files[i];
                String name = file.getName();
                list.add(name);
            }
            return list;
        }
    
        public boolean deleteFile(String fileName) {
            String Path = filePath+"/"+fileName;
            File file = new File(Path);
            if (file.isFile() && file.exists()) {
                return file.delete();
            }
            return false;
        }
    
        /**************Assets****************/
        public String getAssetsFileStringContent(String fileName) {
            String str = null;
            try {
                InputStream inStram =context.getClass().getClassLoader().getResourceAsStream("assets/"+fileName);
                int length = inStram.available();
                byte[] buffer = new byte[length];
                inStram.read(buffer);
                str = new String(buffer, "UTF-8");
                inStram.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            return str;
        }
    
        public static void copyDBToMemoryCard(Context context)
        {
            String customizeDbName = LaunchActivity.getInstance().customizeDbName();
            String path="/data/data/"+ context.getPackageName()+"/databases"+"/"+ customizeDbName;
            File file=new File(path);
            if(!file.exists()){
                try {
                    File dir = new File(file.getParent());
                    dir.mkdirs();
                    file.createNewFile();
                    OutputStream os=new FileOutputStream(path);
                    InputStream is = context.getResources().getAssets().open(customizeDbName);
                    //InputStream is =context.getClass().getClassLoader().getResourceAsStream("assets/"+customizeDbName);
                    int count;
                    byte[] buffer=new byte[1024];
                    while((count=is.read(buffer))>0)
                        os.write(buffer,0,count);
                    os.close();
                    is.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    
    
    }

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