我遇到了asyncTask的问题。在我的应用程序中，用户必须登录。他做了一次，我保存了登录/密码。当他第二次启动应用程序时，我想显示另一个有进度条的xml，而不是用login和pwd editText显示屏幕。
要做到这一点，我看看它是否是第一次认证，并且对应于我放好的xml的答案。当我只使用progressBar显示xml时，我使用asyncTask连接到服务器，并加载我需要的内容。
这在模拟器上完美运行，但是当我将应用程序放在m'y Nexus S（Android 2.3.3）上时，我只是一个白色屏幕，没有任何附加功能。
我的活动代码：
public class AuthentificationActivity extends Activity implements
OnClickListener {
private Button btnConnection;
private EditText edtUserName;
private EditText edtPassword;
private TextView lblForgottenPass;
private ProgressBar progressBar;
private TextView txtProgression;
private TextView txtAlerts;
private EntirePersonBM entirePersonBM = new EntirePersonBM();
private String uidh = new String();
private String userName = new String();
private String password = new String();
private boolean isFirstConnection = true;
public static boolean isFinishApp = false;
private Selection selection;
private SelectionResultSet resultSet;
private SharedPreferences settings;
private String alerts = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
settings = getSharedPreferences("login", 0);
isFirstConnection = settings.getBoolean("isFirstConnection",
true);
try {
if (isFirstConnection) {
// Put connection screen, and help
this.setContentView(R.layout.login);
btnConnection = (Button) findViewById(R.id.btnConnection);
edtUserName = (EditText) findViewById(R.id.edtUserName);
edtPassword = (EditText) findViewById(R.id.edtPassword);
lblForgottenPass = (TextView) findViewById(R.id.lblForgottenPass);
progressBar = (ProgressBar) findViewById(R.id.progressBar1);
txtProgression = (TextView) findViewById(R.id.textView1);
txtAlerts = (TextView) findViewById(R.id.txtAlerts);
btnConnection.setOnClickListener(this);
lblForgottenPass.setOnClickListener(this);
} else {
// Directly connect to server with saved login/pwd
// Retrieve login/pwd
this.setContentView(R.layout.splash_login);
txtProgression = (TextView) findViewById(R.id.txtProgression);
userName = settings.getString("currentUserName", null);
password = settings.getString("currentPwd", null);
new ConnectionTask().execute("");
}
}
} catch (Exception e) {
Alerts
.showAlert(getString(R.string.AlertsErrorOccured), this,
true);
}
}
public void connect(SharedPreferences settings) {
String login = settings.getString("currentUserName", null);
String pwd = settings.getString("currentPwd", null);
Log.v("Retrieve user", "Always log >>> Login = " + login);
// call server
AuthentificationServletCall auth = new AuthentificationServletCall();
try {
entirePersonBM = auth.Authentification("BoozterMobile", login, pwd,
"passwordHash");
Log.v("call server", "Connecting >>> OK");
} catch (Exception e) {
Log.v("call server", "Connecting >>> ERROR :" + e);
e.printStackTrace();
}
}
public void loadMail() {
selection = callsUtils.loadingSelection(UserControler.getInstance()
.getUidh(), "NEW", null, String
.valueOf(BoozterMobileConstants.MAX_VALUES_SUGGESTION), "desc");
if (selection != null) {
resultSet = callsUtils.loadingMailList(UserControler.getInstance()
.getUidh(), selection, String.valueOf(1));
}
if (selection != null && resultSet != null) {
ListHeaderControler.getInstance().setFirstAuthentification(false);
ListHeaderControler.getInstance().setRefresh(false);
ListHeaderControler.getInstance().setSentMail(false);
ListHeaderControler.getInstance().setSplashActivty(true);
ListHeaderControler.getInstance().setSel(selection);
ListHeaderControler.getInstance().setRs(resultSet);
ListHeaderControler.getInstance().setMailHeaderList(
resultSet.getEuis());
}
}
private class ConnectionTask extends AsyncTask<String, Void, Object> {
protected Void doInBackground(String... args) {
Log.v("AsyncTask", "Start connectionTask");
connect(settings);
return null;
}
protected void onPostExecute(Object result) {
// Pass the result data back to the main activity
txtProgression.setText(getString(R.string.lblGetBlock));
new BlockLoaderTask().execute("");
}
}
private class BlockLoaderTask extends AsyncTask<String, Void, Object> {
protected Void doInBackground(String... args) {
Log.v("AsyncTask", "Start BlockLoaderTask");
BlockControler.getInstance().setListWhere(
BlocksUtils.generateList(String
.valueOf(BoozterMailConstants.BLOCK_CATEGORY_ID),
true, null));
return null;
}
protected void onPostExecute(Object result) {
// Pass the result data back to the main activity
txtProgression.setText(getString(R.string.lblGetMails));
new MailLoaderTask().execute("");
}
}
private class MailLoaderTask extends AsyncTask<String, Void, Object> {
protected Void doInBackground(String... args) {
Log.v("AsyncTask", "Start BlockLoaderTask");
loadMail();
return null;
}
protected void onPostExecute(Object result) {
// create Intent
Intent defineIntent = new Intent(AuthentificationActivity.this,
HeaderMailDisplayActivity.class);
// Object that allows to pass the mail's seqnums and person's uidh
// onto headerMail activity
Bundle objetbunble = new Bundle();
objetbunble.putString("positionList", String.valueOf(1));
defineIntent.putExtras(objetbunble);
// call headerMail activity
AuthentificationActivity.this.startActivity(defineIntent);
}
}
}
请帮助我，我尝试了很多方法，没有任何作用，我放弃了做我想做的希望
我刚刚发现了一个带有android 2.1的设备，它运行正常。那么有些东西与android 2.3不兼容？