我有我的MainAcitivity
内部下面的代码使用方法jsnrqstr.sendRequest(username, password, URL);
如何使用HTTPPost没有新的可运行线程
loginButton.setOnClickListener(
new View.OnClickListener()
{
public void onClick(View view)
{
username = userNameBox.getText().toString();
password = passwordBox.getText().toString();
login_state = jsnrqstr.sendRequest(username, password, URL);
if(login_state.equals("ok")){
details.setUserName(username);
details.setPassword(password);
Toast.makeText(MainActivity.this, "User Verified", Toast.LENGTH_LONG).show();
passwordBox.setText("");
Intent myIntent = new Intent(MainActivity.this, DashBoardActivity.class);
MainActivity.this.startActivity(myIntent);
}else
Toast.makeText(MainActivity.this, "Login Unsuccessful", Toast.LENGTH_LONG).show();
passwordBox.setText("");
}
});
此方法使用下面的代码,用于接收拍摄的用户名和密码登录到应用程序从一个Erlang服务器响应该响应与JSON对象,我可以从它接收login_state。代码jsnrqstr.sendRequest(username, password, URL);
public class JSONRequester {
String state;
public String sendRequest(final String userName, final String password, final String URL){
new Thread(new Runnable() {
public void run() {
HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 10000); //Timeout Limit
HttpResponse response;
JSONObject json = new JSONObject();
try{
HttpPost post = new HttpPost(URL);
post.setHeader("Content-type", "application/json");
json.put("username", userName);
json.put("password", password);
StringEntity se = new StringEntity(json.toString());
se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
post.setEntity(se);
response = client.execute(post);
/*Checking response */
if(response!=null){
String temp = EntityUtils.toString(response.getEntity()); //Get the data in the entity
//Log.v("response", temp);
JsonObject o = new JsonParser().parse(temp).getAsJsonObject();
Log.v("response", o.get("state").toString());
state = o.get("state").toString();
}}
catch(Exception e){
e.printStackTrace();
//createDialog("Error", "Cannot Estabilish Connection");
}
}
}).start();
return state;
}
但我得到以下空指针异常 @
if(login_state.equals("ok")){
线,这意味着我没有正确地返回从上述方法login_state
值。因为我认为这是因为当时的新运行的线程返回值为时已晚。我能做些什么来解决这个问题?
谢谢。有效。 – ssrp