Android代码在哪里开始,Android开始之内部存储(示例代码)

墨蓝 2022-10-14 00:59 66阅读 0赞

1.保存文件在设备内部私有存储中，其他应用访问不到；

2.应用卸载后，，文件自动删

3.缓存

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![0028b52c55fad0a58d004a6814ba6441.png][]

\----------------------------测试---------------------------

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\-----------------测试---------------------

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\------------------输入内容，，存入文件------------------------------

需要EditText和Button

![9a80f8060afa8cabbacf333e6abdd216.png][]

\----------------------------------保存到缓存文件---------------------------------------------------

1 //----------------保存到缓冲文件中----------------------

2 public boolean saveCacheFile(String filename,byte\[\]data) \{3 boolean flag = false;4 File file =context.getFilesDir();5 FileOutputStream outputStream = null;6 try\{7 File folderFile=new File(file.getAbsolutePath()+"/txt");//创建文件TXT目录8 if (!folderFile.exists()) \{9 folderFile.mkdirs();//创建目录

10 \}11 //outputStream = context.openFileOutput("my.txt",12 //context.MODE\_WORLD\_WRITEABLE);

13 outputStream=new FileOutputStream(folderFile.getAbsolutePath()+"/"+filename);14 outputStream.write(data,0,data.length);15 \} catch(Exception e) \{16 //TODO: handle exception

17 e.printStackTrace();18 \} finally\{19 if (outputStream != null) \{20 try\{21 outputStream.close();22 \} catch(Exception e2) \{23 //TODO: handle exception

24 \}25

26 \}27

28 \}29 //System.out.println("---->>"+file.getAbsolutePath());30 //-->>/data/data/com.example.android\_datastorage\_internal/files

32 returnflag;33 \}

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1 //-------------遍历内容-------------------

2 public voidlistCacheFile()\{3

4 //String\[\] strings =context.fileList();5 //for (String string:strings) \{6 //System.out.println("----->>"+string);//列出文件夹：txt7 //\}8 //遍历文件

9 File file=context.getFilesDir();10 File root=new File(file.getAbsolutePath()+"/txt");11 File\[\] listFile=root.listFiles();12 for(File file2:listFile) \{13 System.out.println("---->>"+file2.getName());//列出文件夹里边的文件hello.txt

15 \}16 \}17 \}

\------测试----------------------------------------

1 public voidtest()\{2 FileService service=newFileService(getContext());3 //service.saveCacheFile("hello.txt","你好".getBytes());

4 service.listCacheFile();5

6 \}

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[5a8e130526933c2db5ac6fcdc5edf5d8.png]: /images/20221014/7c084370efe841649dd1c75b197e1eb6.png
[cd1d17b917c5701e6780a5a9c2859d3e.png]: /images/20221014/baea01ae765d473e8998b44854324571.png
[1db44ad88071ece638f250eb700fbfba.png]: /images/20221014/11762b1545fc4f57a45f432bbc530df0.png
[9a80f8060afa8cabbacf333e6abdd216.png]: /images/20221014/037c84b1723d4ecca658aadaa0eafcb4.png
[6d9dd7bfa168234584cbba60df9a0ed6.png]: /images/20221014/5bcf4b2f2e574dd6b839cd20914b5f09.png