文件保存在Android

Question

我想提出一个XML文件，并保存在我的设备代码如下

HttpClient httpclient = new DefaultHttpClient(); 
     HttpPost httppost = new HttpPost("http://xx:xx:xx:xx:yy/LoginAndroid.asmx/login"); 
     httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
     HttpResponse response = httpclient.execute(httppost); 
     String responseBody = EntityUtils.toString(response.getEntity()); 
     //Toast.makeText(getApplicationContext(),"responseBody: "+responseBody,Toast.LENGTH_SHORT).show(); 

     //saving the file as a xml 
     FileOutputStream fOut = openFileOutput("loginData.xml",MODE_WORLD_READABLE); 
     OutputStreamWriter osw = new OutputStreamWriter(fOut); 
     osw.write(responseBody); 
     osw.flush(); 
     osw.close(); 

     //reading the file as xml 
     FileInputStream fIn = openFileInput("loginData.xml"); 
     InputStreamReader isr = new InputStreamReader(fIn); 
     char[] inputBuffer = new char[responseBody.length()]; 
     isr.read(inputBuffer); 
     String readString = new String(inputBuffer); 

文件是保存我还可以读取该文件的每一件事情是确定的，但看这条线

char[] inputBuffer = new char[responseBody.length()];

它计算可被保存在保存的file.I现在的储蓄在一个Acivity的文件，并从另一个活动阅读它和我的应用程序将文件保存到本地，一旦时间字符串的长度，所以我可以不能够以获得该返回的长度每次有n个字符串那么有什么办法动态地分配char[] inputBuffer的大小？

Answer 1

您可以在另一个活动中使用下面的代码来读取文件。看看BufferedReader课。

InputStream instream = new FileInputStream("loginData.xml"); 

// if file the available for reading 
if (instream != null) { 
    // prepare the file for reading 

    InputStreamReader inputreader = new InputStreamReader(instream); 
    BufferedReader buffreader = new BufferedReader(inputreader); 

    String line; 

    // read every line of the file into the line-variable, on line at the time 
    while (buffreader.hasNext()) { 
    line = buffreader.readLine(); 
    // do something with the line 

    } 

} 

编辑：

上面的代码是为读文件工作正常，但如果你只是想分配char[] inputBuffer dynamicall的大小，那么你可以使用下面的代码。

InputStream is = mContext.openFileInput("loginData.xml"); 
ByteArrayOutputStream bos = new ByteArrayOutputStream(); 
byte[] b = new byte[1024]; 
while ((int bytesRead = is.read(b)) != -1) { 
    bos.write(b, 0, bytesRead); 
} 
byte[] inputBuffer = bos.toByteArray(); 

现在，根据需要使用inputBuffer。