Verwendung des Fortschrittsdialogs in AsyncTask unter Android
Ich entwickle eine App, bei der ein Benutzer sich anmelden muss. Die Anmeldung funktioniert über eine URL. Wenn ich jedoch eine AsyncTask hinzufüge, um einen Fortschrittsdialog hinzuzufügen, ändert die App nicht die Absicht. Ich habe jede mir bekannte Methode vergeblich ausprobiert. unten ist der Code:
package com.epolicing;
import java.util.ArrayList;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class LoginActivity extends Activity implements OnClickListener{
Button loginButton;
EditText usernme,passwrd;
TextView error;
String username,password;
static final int Dialog_logging_in=1;
boolean userverified=false;
// Session Manager Class
SessionManager session;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
session = new SessionManager(getApplicationContext());
loginButton = (Button) findViewById(R.id.loginButton);
usernme = (EditText) findViewById(R.id.UserName);
passwrd=(EditText) findViewById(R.id.password);
username=usernme.getText().toString().trim();
password=passwrd.getText().toString().trim();
error=(TextView)findViewById(R.id.errorTextView);
loginButton.setOnClickListener(this);
}
protected Dialog onCreateDialog(int id){
Dialog dialog = null;
switch(id){
case Dialog_logging_in:
ProgressDialog.show(LoginActivity.this,"","Authenticating user...");
break;
default:
dialog=null;
}
return dialog;
}
public void onClick(View v) {
switch(v.getId()){
case R.id.loginButton:
String user,pass;
user=usernme.getText().toString();
pass=passwrd.getText().toString();
if(user.equals("")||pass.equals("")){
message();
}
else {
new log_in().execute(this);
}
break;
}
}
//login method
public void login() {
ArrayList<NameValuePair>postParameters=new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("username",usernme.getText().toString()));
postParameters.add(new BasicNameValuePair("password",passwrd.getText().toString().trim()));
//String valid="1";
String response=null;
try{
response=CustomHttpClient.executeHttpPost("http://10.0.2.2/epolicing/tologin.php",postParameters);
String res=response.toString();
res=res.replaceAll("\\s+","");
if(res.equals("0")) {
error.setText("Wrong password or username combination");
}
else {
String usern=usernme.getText().toString().trim();
session.createLoginSession(usern,res);
userverified=true;
//Intent intent=new Intent(LoginActivity.this,menu.class);
//startActivity(intent);
}
}
catch(Exception e){
error.setText(e.toString());
}
}
public void message(){
Context context=getApplicationContext();
CharSequence text="username and/or password cannot be blank";
int duration=Toast.LENGTH_LONG;
Toast toast=Toast.makeText(context, text, duration);
toast.show();
}
private class log_in extends AsyncTask<LoginActivity,Void,LoginActivity>{
@Override
protected void onPreExecute(){
showDialog(Dialog_logging_in);
}
@Override
protected LoginActivity doInBackground(LoginActivity... Params) {
login();
return null;
}
protected void onPostExecute(LoginActivity params){
super.onPostExecute(params);
//dismissDialog(Dialog_logging_in);
if(userverified==true){
Intent intent=new Intent(LoginActivity.this,menu.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
LoginActivity.this.startActivity(intent);
}
}
}
}
Hier ist das Protokoll:
01-20 19:36:53.685: E/WindowManager(1191): Activity com.epolicing.LoginActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40555c68 that was originally added here
01-20 19:36:53.685: E/WindowManager(1191): android.view.WindowLeaked: Activity com.epolicing.LoginActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40555c68 that was originally added here
01-20 19:36:53.685: E/WindowManager(1191): at android.view.ViewRoot.<init>(ViewRoot.java:258)
01-20 19:36:53.685: E/WindowManager(1191): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
01-20 19:36:53.685: E/WindowManager(1191): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
01-20 19:36:53.685: E/WindowManager(1191): at android.view.Window$LocalWindowManager.addView(Window.java:424)
01-20 19:36:53.685: E/WindowManager(1191): at android.app.Dialog.show(Dialog.java:241)
01-20 19:36:53.685: E/WindowManager(1191): at android.app.ProgressDialog.show(ProgressDialog.java:107)
01-20 19:36:53.685: E/WindowManager(1191): at android.app.ProgressDialog.show(ProgressDialog.java:90)
01-20 19:36:53.685: E/WindowManager(1191): at android.app.ProgressDialog.show(ProgressDialog.java:85)
01-20 19:36:53.685: E/WindowManager(1191): at com.epolicing.LoginActivity.onCreateDialog(LoginActivity.java:50)
01-20 19:36:53.685: E/WindowManager(1191): at android.app.Activity.onCreateDialog(Activity.java:2482)
01-20 19:36:53.685: E/WindowManager(1191): at android.app.Activity.createDialog(Activity.java:882)
01-20 19:36:53.685: E/WindowManager(1191): at android.app.Activity.showDialog(Activity.java:2557)
01-20 19:36:53.685: E/WindowManager(1191): at android.app.Activity.showDialog(Activity.java:2524)
01-20 19:36:53.685: E/WindowManager(1191): at com.epolicing.LoginActivity$log_in.onPreExecute(LoginActivity.java:120)
01-20 19:36:53.685: E/WindowManager(1191): at android.os.AsyncTask.execute(AsyncTask.java:391)
01-20 19:36:53.685: E/WindowManager(1191): at com.epolicing.LoginActivity.onClick(LoginActivity.java:71)
01-20 19:36:53.685: E/WindowManager(1191): at android.view.View.performClick(View.java:2485)
01-20 19:36:53.685: E/WindowManager(1191): at android.view.View$PerformClick.run(View.java:9080)
01-20 19:36:53.685: E/WindowManager(1191): at android.os.Handler.handleCallback(Handler.java:587)
01-20 19:36:53.685: E/WindowManager(1191): at android.os.Handler.dispatchMessage(Handler.java:92)
01-20 19:36:53.685: E/WindowManager(1191): at android.os.Looper.loop(Looper.java:123)
01-20 19:36:53.685: E/WindowManager(1191): at android.app.ActivityThread.main(ActivityThread.java:3683)
01-20 19:36:53.685: E/WindowManager(1191): at java.lang.reflect.Method.invokeNative(Native Method)
01-20 19:36:53.685: E/WindowManager(1191): at java.lang.reflect.Method.invoke(Method.java:507)
01-20 19:36:53.685: E/WindowManager(1191): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-20 19:36:53.685: E/WindowManager(1191): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-20 19:36:53.685: E/WindowManager(1191): at dalvik.system.NativeStart.main(Native Method)
Hilfe wird sehr geschätzt. Danke.