使用Android从服务器获取数据并加载新屏幕
我使用下面的代码从服务器获取数据，如果服务器的值是使用Android从服务器获取数据并加载新屏幕,android,Android,我使用下面的代码从服务器获取数据，如果服务器的值是GEEK，那么它将加载到下一个类，但不会加载新视图。你能说什么问题吗 public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); login = (Button) findViewById(R.id.login);
GEEK它区分大小写吗？比较大小写不重要的字符串时，应使用.equalsIgnoreCase（），比较大小写重要的字符串时，应使用.equals（）。您是否已经完成了此步骤并进行了调试，以确保
tryLogin（mUsername，mPassword）new LoginTask().execute(mUsername, mPassword);
private class LoginTask extends AsyncTask<string, void,="" String=""> {
protected String doInBackground(String... login) {
return tryLogin((login[0],login[1]);
}
protected void onPostExecute(String result) {
if(result.equalsIgnoreCase("GEEK"))
{
Intent i = new Intent();
i.setClassName(v.getContext(),"com.httplogin.MainScreen");
startActivity(i);
}
}
}
私有类登录任务扩展异步任务{
受保护的字符串doInBackground（字符串…登录）{
返回tryLogin（（登录名[0]，登录名[1]）；
}
受保护的void onPostExecute（字符串结果）{
if（result.equalsIgnoreCase（“极客”））
{
意图i=新意图（）；
i、 setClassName（v.getContext（），“com.httplogin.MainScreen”）；
星触觉（i）；
}
}
}
public class HttpLogin extends Activity {
/** Called when the activity is first created. */
private Button login;
private EditText username, password;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
login = (Button) findViewById(R.id.login);
username = (EditText) findViewById(R.id.username);
password = (EditText) findViewById(R.id.password);
login.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String Re;
String mUsername = username.getText().toString();
String mPassword = password.getText().toString();
Re=tryLogin(mUsername, mPassword);
Log.d(" Check ","Here");
Log.d("Re",Re);
String temp_check=Re.trim();
if(temp_check.equals("GEEK"))
{
Intent i = new Intent();
i.setClassName(v.getContext(),"com.httplogin.MainScreen");
startActivity(i);
}
else
{
//Toast.makeText(HttpLogin.this,"MAX Returned",0).show();
displayAlert(Re);
// Intent i = new Intent();
// i.setClassName(v.getContext(),"com.san.MainScreen");
// startActivity(i);
}
}
});
}
protected String tryLogin(String mUsername, String mPassword)
{
Log.d(" TryLoginCheck ","Here");
HttpURLConnection connection;
OutputStreamWriter request = null;
URL url = null;
String response = null;
String temp=null;
String parameters = "username="+mUsername+"&password="+mPassword;
System.out.println("UserName"+mUsername+"\n"+"password"+mPassword);
Log.d("Parameters",parameters);
try
{
url = new URL("http://serverspace/script.php");
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestMethod("POST");
request = new OutputStreamWriter(connection.getOutputStream());
request.write(parameters);
request.flush();
request.close();
String line = "";
InputStreamReader isr = new InputStreamReader(connection.getInputStream());
BufferedReader reader = new BufferedReader(isr);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
temp=sb.toString();
Log.d("Temp",temp);
// Response from server after login process will be stored in response variable.
response = sb.toString();
Log.d("Response",response);
Log.d("Sb Value",sb.toString());
isr.close();
reader.close();
}
catch(IOException e)
{
Toast.makeText(this,e.toString(),0).show();
}
// Log.d("Response",response);
return response;
}
public void displayAlert(String Re)
{
new AlertDialog.Builder(this).setMessage(Re)
.setTitle("Returned Value")
.setCancelable(true)
.setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton){
finish();
}
})
.show();
}
}
如果（Re.equals（“GEEK”）{…}在这里阅读更多->参见我在上面的答案中添加的示例。