我使用 USB 调试测试了应用程序和设备，但得到了不同的结果。在模拟器中它工作正常，但在设备上我无法登录，只是扔吐司
Toast.makeText(Login.this,"result is null- an error occured",Toast.LENGTH_SHORT).show();.
为什么会这样？我的模拟器在 OS 2.3.3 上运行，我的设备在 4.0 上运行。
当我在我的设备上测试时，logcat 没有出现，logcat 仅在我在模拟器 Oo 上运行时显示进程
任何人请帮助我，非常感谢。
登录.java
public class Login extends Activity {
public Koneksi linkurl;
String SERVER_URL;
private Button login, register, setting;
private EditText username, password;
public ProgressDialog progressDialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
setting = (Button)findViewById(R.id.bsetting);
login = (Button) findViewById(R.id.login);
register = (Button) findViewById(R.id.reg);
username = (EditText) findViewById(R.id.uname);
password = (EditText) findViewById(R.id.pass);
setting.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intentSet = new Intent(Login.this, UrlSetting.class);
startActivity(intentSet);
}
});
register.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intentReg = new Intent(Login.this, Register.class);
startActivity(intentReg);
}
});
login.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
new LoginTask().execute();
}
});
}
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
{
;
linkurl = new Koneksi(this);
SERVER_URL = linkurl.getUrl();
SERVER_URL += "/mobile/Login.php";
url = new URL(SERVER_URL);
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 = sb.toString();
Log.d("Response",response);
Log.d("Sb Value",sb.toString());
isr.close();
reader.close();
}
catch(IOException e)
{
return null;
}
return response;
}
public class LoginTask extends AsyncTask<String, String, String> {
String result = null;
@Override
protected void onPreExecute()
{
}
@Override
protected String doInBackground(String... arg0)
{
String mUsername = username.getText().toString();
String mPassword = password.getText().toString();
return tryLogin(mUsername, mPassword);
}
protected void onPostExecute(String result){
super.onPostExecute(result);
if(result==null)
{
Toast.makeText(Login.this,"result is null- an error occured",Toast.LENGTH_SHORT).show();
}
else{
result = result.trim();
Log.d("Check","Here");
Log.d("Response",result);
if(result.toLowerCase().contains("berhasil"))
{
String nama = username.getText().toString();
Intent newIntent = new Intent(Login.this, MainPage.class);
Bundle bundle = new Bundle();
bundle.putString("nama", nama);
newIntent.putExtras(bundle);
startActivityForResult(newIntent, 0);
}
else
{
//Optional
//Kalau bisa dibuat constant untuk menghindari salah penulisan
String RoleError = "ROLE SALAH";
String UserError = "USER SALAH";
createDialog("Maaf", result.equals(RoleError) ? "Role Anda bukan Student!" : "Username Atau Password Salah!");
}
}
}
}
private void createDialog(String title, String text) {
AlertDialog ad = new AlertDialog.Builder(this)
.setPositiveButton("Ok", null)
.setTitle(title)
.setMessage(text)
.create();
ad.show();
}
}