android创建txt文件，读取txt文件内容

1.android在sd卡上创建一个txt文件，并且写入内容：

public static boolean saveTxt(String phoneNumber,Context context,String path){                 //sd卡检测 String sdStatus = Environment.getExternalStorageState(); if(!sdStatus.equals(Environment.MEDIA_MOUNTED)){ Toast.makeText(context, "SD 卡不可用", Toast.LENGTH_SHORT).show(); return false; }               //检测文件夹是否存在 File file = new File(path); file.exists(); file.mkdirs(); String p = path+File.separator+"1.txt"; FileOutputStream outputStream = null; try {                         //创建文件，并写入内容 outputStream = new FileOutputStream(new File(p)); String msg = new String(phoneNumber); outputStream.write(msg.getBytes("UTF-8"));} catch (FileNotFoundException e) {e.printStackTrace();return false;} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{if(outputStream!=null){try {outputStream.flush();} catch (IOException e) {e.printStackTrace();}try {outputStream.close();} catch (IOException e) {e.printStackTrace();}}}return true;}

2.读取txt内容

public static String readPhoneNumber(String path){byte Buffer[] = new byte[1024];//得到文件输入流File file = new File(path+File.separator+"1.txt");FileInputStream in = null;ByteArrayOutputStream outputStream = null;try { in = new FileInputStream(file);//读出来的数据首先放入缓冲区，满了之后再写到字符输出流中int len = in.read(Buffer);//创建一个字节数组输出流outputStream = new ByteArrayOutputStream();outputStream.write(Buffer,0,len);//把字节输出流转Stringreturn new String(outputStream.toByteArray());} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{if(in!=null){try {in.close();} catch (IOException e) {e.printStackTrace();}}if(outputStream!=null){try {outputStream.flush();outputStream.close();} catch (IOException e) {e.printStackTrace();}}}return null;}

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