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String
return 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;
}
