Android P文件读写

川长思鸟来 2023-06-08 04:34 13阅读 0赞

// 将字节数组byteArray数据写入到文件mcu\_version.txt中

public static void saveVersionFile(byte[] byteArray){ 
        String sdCardDir = Environment.getExternalStorageDirectory().getAbsolutePath();
        Log.i(TAG,"McuCommunication,saveVersionFile=" + sdCardDir);
        File saveFile = new File(sdCardDir, "mcu_version.txt");
        FileOutputStream outStream = null;
        try { 
            outStream = new FileOutputStream(saveFile);
            outStream.write(byteArray);
            outStream.close();
        } catch (IOException e) { 
            e.printStackTrace();
        }
    }

// 从文件file中读出字符串

private static String getFileContent(File file) { 
        String content = "";
        if (!file.isDirectory()) {   //检查此路径名的文件是否是一个目录(文件夹)
            if (file.getName().endsWith("txt")) { //文件格式为""文件
                try { 
                    InputStream instream = new FileInputStream(file);
                    if (instream != null) { 
                        InputStreamReader inputreader = new InputStreamReader(instream, "UTF-8");
                        BufferedReader buffreader = new BufferedReader(inputreader);
                        String line = "";
                        //分行读取
                        while ((line = buffreader.readLine()) != null) { 
                            content += line + "\n";
                        }
                        instream.close();//关闭输入流
                    }
                } catch (java.io.FileNotFoundException e) { 
                    Log.d("TestFile", "The File doesn't not exist.");
                } catch (IOException e) { 
                    Log.d("TestFile", e.getMessage());
                }
            }
        }
        return content;
    }