2015/7/20 问题集

字节流如何转换为字符流

FileInputStream fis = new FileInputStream("c:/abc.txt");// 字节流
 InputStreamReader isr = new InputStreamReader(fis);// 字符流
 BufferedReader br = new BufferedReader(isr);// 缓冲流
 String str = null;
 if ((str = br.readLine()) != null) {
  System.out.println(str);
 }
 br.close();
 isr.close();
 fis.close();
}

去除文件中的空格和回车

  content_str=etSend.getText().toString();
//去除空格
    String drop=content_str.replace(" ","");
//    去除回车
    String droph=drop.replace("\n","");

LayoutInflater加载布局

findViewById加载控件，LayoutInflater加载布局

LayoutInflater layoutInflater=LayoutInflater.from(context);

     layout= (RelativeLayout) layoutInflater.inflate(R.layout.left_item,null);

新建http连接

protected String doInBackground(String... strings) {

 try {
     client=new DefaultHttpClient();
     httpGet=new HttpGet(url);
    httpResponse= client.execute(httpGet);
    entity= httpResponse.getEntity();
     InputStream is=entity.getContent();
     InputStreamReader isr=new InputStreamReader(is);
     BufferedReader br=new BufferedReader(isr);
     String line;
     StringBuffer sb=new StringBuffer();
     while ((line=br.readLine())!=null){
         sb.append(line);
     }
     return sb.toString();
 } catch (IOException e) {
     e.printStackTrace();
 }