我使用以下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,但新视图不加载.你能说出什么问题吗? public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstance
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); if(Re=="GEEK") { Intent i = new Intent(); i.setClassName(v.getContext(),"com.httplogin.MainScreen"); startActivity(i); } } }); } protected String tryLogin(String mUsername, String mPassword) { HttpURLConnection connection; OutputStreamWriter request = null; URL url = null; String response = null; String parameters = "username="+mUsername+"&password="+mPassword; 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"); } // Response from server after login process will be stored in response variable. response = sb.toString(); isr.close(); reader.close(); } catch(IOException e) { Toast.makeText(this,e.toString(),0).show(); } return response; } }请参考此代码…………..,使用trim函数,因为它消除了String中的空间.
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(); } }