android写文件到DOWNLOADS目录

admin管理员组

文章数量:1532379

2023年12月13日发(作者：)

android写文件到DOWNLOADS目录

文件加入权限

android 9以上还需要加入requestLegacyExternalStorage

android:requestLegacyExternalStorage="true"

.......

动态权限申请

@Override

public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

if (requestCode == 1000)

{

if (grantResults[0] == SION_GRANTED)

{

//同意申请权限

} else

{

// 用户拒绝申请权限

xt(,"请同意写操作来记录心率原始数据", _SHORT).show();

}

return;

}

estPermissionsResult(requestCode, permissions, grantResults);

}

onCreate中调用

if (elfPermission(, _EXTERNAL_STORAGE)

!= PackageManager. PERMISSION_GRANTED) {

1000);

}

ActivityCompat. requestPermissions( this, new String[]{sion. WRITE_EXTERNAL_STORAGE,_EXTERNAL_STORAGE

文件读写工具类

package ;

import ;

import edReader;

import ;

import putStream;

import ption;

import tream;

import treamReader;

import AccessFile;

import rdCharsets;

import s;

public class FileUtils {

// 将字符串写入到文本文件

public static void writeTxtToFile(String strcontent, String filePath, String fileName) {

makeFilePath(filePath, fileName);

String strFilePath = filePath +tor+ fileName;

String strContent = strcontent + "rn";

try {

File file = new File(strFilePath);

if (!()) {

Log.d("TestFile", "Create the file:" + strFilePath);

File parent_file = entFile();

if(parent_file != null){

if(parent_())

{

Log.d("TestFile", "parent file path:" + parent_h());

}

}

if(!NewFile())

{

Log.d("TestFile", "文件已经存在,不需要创建");

}

}

RandomAccessFile raf = new RandomAccessFile(file, "rwd");

(());

(es());

();

} catch (Exception e) {

Log.e("TestFile", "Error on write File:" + e);

}

}

//生成文件

public static File makeFilePath(String filePath, String fileName) {

File file = null;

makeRootDirectory(filePath);

try {

file = new File(filePath + fileName);

if (!()) {

if(!NewFile())

{

Log.d("TestFile", "文件已经存在,不需要创建");

}

}

} catch (Exception e) {

tackTrace();

}

return file;

}

//生成文件夹

public static void makeRootDirectory(String filePath) {

File file = null;

try {

file = new File(filePath);

if (!()) {

if(()){

Log.d("TestFile", "file path:" + h());

}

}

} catch (Exception e) {

Log.i("error:", e + "");

}

}

//读取指定目录下的所有TXT文件的文件内容

public static String getFileContent(File file) {

String content = "";

if (!ctory()) { //检查此路径名的文件是否是一个目录(文件夹)

if (e().endsWith("txt")) {//文件格式为""文件

try {

InputStream instream = new FileInputStream(file);

InputStreamReader inputreader

= new InputStreamReader(instream, _8);

BufferedReader buffreader = new BufferedReader(inputreader);

String line = "";

//分行读取

while ((line = ne()) != null) {

content += line + "n";

}

();//关闭输入流

} catch (tFoundException e) {

Log.d("TestFile", "The File doesn't not exist.");

} catch (IOException e) {

Log.d("TestFile", eNonNull(sage()));

}

}

}

return content;

}

}

测试写入文件

String temp = "This is a test file";

File file = getExternalStoragePublicDirectory(DIRECTORY_DOWNLOADS);

xtToFile(temp, h(), "");

本文标签： 文件目录权限申请存在