Android:如何将登录凭证从服务器保存到手机缓存

Question

我有web服务，我想创建一个类，应该在哈希表认证后从服务器获取电子邮件和密码，然后在共享首选项中保存电子邮件和密码。

Answer 1

尝试这个类在你的应用程序中调用webservice，我分享get和post两种方法，你可以根据你的需要使用任何一个。

public class CallService {
String url;
HttpEntity str1;
String str;
Context context;
public Context getContext() {
    return context;
}
public void setContext(Context context) {
    this.context = context;
}
public CallService(String url1) {
    this.url = url1;
}
public String getResponceWithPost() {
    try {
        HttpParams httpParameters = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpParameters,5000000);
        HttpConnectionParams.setSoTimeout(httpParameters,500000);
        HttpConnectionParams.setTcpNoDelay(httpParameters,true);
        HttpClient hc = new DefaultHttpClient(httpParameters);
        HttpPost post= new HttpPost (url);
        HttpResponse rp = hc.execute(post);
        // //////////////
        if (rp.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
            str = EntityUtils.toString(rp.getEntity());
               Log.e("Calling service", str);
                return str;
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return str;
}
public int getResponceWithGet() {
      int code = 0;
    try {
        HttpClient hc = new DefaultHttpClient();
        HttpGet get = new HttpGet(url);
        HttpResponse rp = hc.execute(get);

     code=  rp.getStatusLine().getStatusCode();
            return code;

    } catch (IOException e) {
        Log.e("calling service", e.toString());
        e.printStackTrace();
    }
    catch(Exception e)
    {
        Log.e("calling service", e.toString());
    }
    return code;
}}

这将返回服务器的响应，如电子邮件密码或其他详细信息。你可以将这些细节保存在sharedpreference中。对于共享首选项，请遵循-

http://developer.android.com/guide/topics/data/data-storage.html参照

和在你的活动调用你的url使用我的调用服务类，像这样-

在activity中像这样声明hashTable

Hashtable hashtable = new Hashtable();

调用这个方法

new checkForLogin().execute();

和你的异步类

class checkForLogin extends AsyncTask<Void, Void,String>
{
    @Override 
    protected void onPreExecute() { 
        progress= ProgressDialog.show(LoginScreen.this,"Authenticating !","Please Wait");
    } 
    @Override
    protected String doInBackground(Void... params) {
        // TODO Auto-generated method stub
Parse your json data here that will be in data
CallService  cl2=new CallService("your server url here");
        Log.e("login url is",""+Urls.loginurl);
        data=cl2.getResponceWithPost();
        Log.e("server response data","data = "+data);
hashtable.put(“email″, data.getString("email"));
hashtable.put(“pass″, data.getString("pass"));
        return null;
    }
    @Override
    protected void onPostExecute(String result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);
        progress.dismiss();
    }