添加进度对话框asynctask Android登录
[英]add progress dialog asynctask Android Login
问题描述
to Login with PHP, MySQL and SQLite and it works. 
使用PHP，MySQL和SQLite登录，它的工作原理。
but i want to add a progressdialog when the login is in progress. 但我想在登录进行时添加progressdialog。
this is my login activity before add asynctask and works 这是我添加asynctask之前的登录活动并且有效
package com.app.DatabaseSample;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.app.library.DatabaseHandler;
import com.app.library.UserFunctions;
public class LoginActivity extends Activity {
Button btnLogin;
Button btnLinkToRegister;
EditText inputUsername;
EditText inputPassword;
TextView loginErrorMsg;
// JSON Response node names
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR = "error";
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_UID = "uid";
private static String KEY_NAME = "name";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
// Importing all assets like buttons, text fields
inputUsername = (EditText) findViewById(R.id.loginUsername);
inputPassword = (EditText) findViewById(R.id.loginPassword);
btnLogin = (Button) findViewById(R.id.btnLogin);
loginErrorMsg = (TextView) findViewById(R.id.login_error);
// Login button Click Event
btnLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
String email = inputUsername.getText().toString();
String password = inputPassword.getText().toString();
UserFunctions userFunction = new UserFunctions();
Log.d("Button", "Login");
JSONObject json = userFunction.loginUser(email, password);
// check for login response
try {
if (json.getString(KEY_SUCCESS) != null) {
loginErrorMsg.setText("");
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
// user successfully logged in
// Store user details in SQLite Database
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
// Clear all previous data in database
userFunction.logoutUser(getApplicationContext());
db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));
// Launch Dashboard Screen
Intent dashboard = new Intent(getApplicationContext(), DatabaseSample.class);
// Close all views before launching Dashboard
dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(dashboard);
// Close Login Screen
finish();
}else{
// Error in login
loginErrorMsg.setText("Incorrect username/password");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
}
}
and after i edit with asyntask 在我用asyntask编辑之后
there is my login activity 有我的登录活动
package com.app.DatabaseSample;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import com.app.library.DatabaseHandler;
import com.app.library.JSONParser;
import com.app.library.UserFunctions;
public class LoginActivity extends Activity {
Button btnLogin;
Button btnLinkToRegister;
EditText inputUsername;
EditText inputPassword;
TextView loginErrorMsg;
// JSON Response node names
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR = "error";
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_UID = "uid";
private static String KEY_NAME = "name";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
// Importing all assets like buttons, text fields
inputUsername = (EditText) findViewById(R.id.loginUsername);
inputPassword = (EditText) findViewById(R.id.loginPassword);
btnLogin = (Button) findViewById(R.id.btnLogin);
loginErrorMsg = (TextView) findViewById(R.id.login_error);
// Login button Click Event
btnLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
readLogin(view);
}
});
}
private class ProcessLogin extends AsyncTask<String, String, String> {
private ProgressDialog dialog;
private ProgressDialog pDialog;
protected Context applicationContext;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(LoginActivity.this);
pDialog.setMessage("Loading User ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
inputUsername = (EditText) findViewById(R.id.loginUsername);
inputPassword = (EditText) findViewById(R.id.loginPassword);
String email = inputUsername.getText().toString();
String password = inputPassword.getText().toString();
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.loginUser(email, password);
Log.d("Button", "Login");
try {
if (json.getString(KEY_SUCCESS) != null) {
loginErrorMsg.setText("");
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
// user successfully logged in
// Store user details in SQLite Database
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
// Clear all previous data in database
userFunction.logoutUser(getApplicationContext());
db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));
// Launch Dashboard Screen
Intent dashboard = new Intent(getApplicationContext(), DatabaseSample.class);
// Close all views before launching Dashboard
dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(dashboard);
// Close Login Screen
finish();
}else{
// Error in login
loginErrorMsg.setText("Incorrect username/password");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
Intent dashboard = new Intent(getApplicationContext(), DatabaseSample.class);
dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(dashboard);
// Close Login Screen
finish();
}
});
}
}
public void readLogin(View view) {
new ProcessLogin().execute();
// check for login response
}
}
i try to run but error. 我尝试运行但错误。
this is my logcat. 这是我的logcat。
01-02 12:10:42.445: ERROR/JSON(4021): {"tag":"login","success":0,"error":1,"error_msg":"Incorrect email or password!"}
01-02 12:10:42.453: DEBUG/Button(4021): Login
01-02 12:10:42.453: WARN/dalvikvm(4021): threadid=9: thread exiting with uncaught exception (group=0x40015560)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): FATAL EXCEPTION: AsyncTask #1
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): java.lang.RuntimeException: An error occured while executing doInBackground()
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.os.AsyncTask$3.done(AsyncTask.java:200)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at java.lang.Thread.run(Thread.java:1019)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): Caused by: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.view.ViewRoot.checkThread(ViewRoot.java:2932)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.view.ViewRoot.invalidateChild(ViewRoot.java:642)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:668)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.view.ViewGroup.invalidateChild(ViewGroup.java:2511)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.view.View.invalidate(View.java:5279)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.widget.TextView.checkForRelayout(TextView.java:5528)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.widget.TextView.setText(TextView.java:2730)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.widget.TextView.setText(TextView.java:2598)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.widget.TextView.setText(TextView.java:2573)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at com.app.DatabaseSample.LoginActivity$ProcessLogin.doInBackground(LoginActivity.java:99)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at com.app.DatabaseSample.LoginActivity$ProcessLogin.doInBackground(LoginActivity.java:1)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at android.os.AsyncTask$2.call(AsyncTask.java:185)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
01-02 12:10:42.460: ERROR/AndroidRuntime(4021): ... 4 more
01-02 12:10:42.468: WARN/ActivityManager(1308): Force finishing activity com.app.DatabaseSample/.LoginActivity
01-02 12:10:42.585: WARN/IInputConnectionWrapper(4021): showStatusIcon on inactive InputConnection
01-02 12:10:42.585: WARN/InputManagerService(1308): Starting input on non-focused client com.android.internal.view.IInputMethodClient$Stub$Proxy@40683810 (uid=10040 pid=4021)
01-02 12:10:43.320: ERROR/WindowManager(4021): Activity com.app.DatabaseSample.LoginActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40529e48 that was originally added here
01-02 12:10:43.320: ERROR/WindowManager(4021): android.view.WindowLeaked: Activity com.app.DatabaseSample.LoginActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40529e48 that was originally added here
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.view.ViewRoot.<init>(ViewRoot.java:258)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.view.Window$LocalWindowManager.addView(Window.java:424)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.app.Dialog.show(Dialog.java:241)
01-02 12:10:43.320: ERROR/WindowManager(4021): at com.app.DatabaseSample.LoginActivity$ProcessLogin.onPreExecute(LoginActivity.java:83)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.os.AsyncTask.execute(AsyncTask.java:391)
01-02 12:10:43.320: ERROR/WindowManager(4021): at com.app.DatabaseSample.LoginActivity.readLogin(LoginActivity.java:156)
01-02 12:10:43.320: ERROR/WindowManager(4021): at com.app.DatabaseSample.LoginActivity$1.onClick(LoginActivity.java:63)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.view.View.performClick(View.java:2485)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.view.View$PerformClick.run(View.java:9080)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.os.Handler.handleCallback(Handler.java:587)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.os.Handler.dispatchMessage(Handler.java:92)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.os.Looper.loop(Looper.java:130)
01-02 12:10:43.320: ERROR/WindowManager(4021): at android.app.ActivityThread.main(ActivityThread.java:3683)
01-02 12:10:43.320: ERROR/WindowManager(4021): at java.lang.reflect.Method.invokeNative(Native Method)
01-02 12:10:43.320: ERROR/WindowManager(4021): at java.lang.reflect.Method.invoke(Method.java:507)
01-02 12:10:43.320: ERROR/WindowManager(4021): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-02 12:10:43.320: ERROR/WindowManager(4021): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-02 12:10:43.320: ERROR/WindowManager(4021): at dalvik.system.NativeStart.main(Native Method)
how to add a progress dialog in my login activity? 如何在我的登录活动中添加进度对话框？
BR BR
Alex 亚历克斯
4 个解决方案
解决方案1
3 已采纳 2013-01-02 09:55:16
CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
because currently you are trying to Access UI Elements from doInBackground of ProcessLogin AsyncTask . 因为目前您正在尝试从ProcessLogin AsyncTask doInBackground访问UI元素。
just move all Ui elements from doInBackground to onPostExecute for updating Ui doInBackground execution complete 只需将所有Ui元素从doInBackground移动到onPostExecute以更新Ui doInBackground执行完成
解决方案2
0 2013-01-02 09:57:09
Problem is with the following lines: 问题在于以下几行：
loginErrorMsg.setText("");
loginErrorMsg.setText("Incorrect username/password");
you can not update UI from non UI thread. 您无法从非UI线程更新UI。 And since doInBackground() gets executed in the non UI thread you can not update UI from that method.. 由于doInBackground()在非UI线程中执行，因此您无法从该方法更新UI。
Use Handler to update UI from non UI thread... 使用Handler从非UI线程更新UI ...
解决方案3
0 2013-01-02 09:58:48
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
Intent dashboard = new Intent(getApplicationContext(),
DatabaseSample.class);
dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(dashboard);
// Close Login Screen
finish();
This code should be inside a function of the class LoginActivity. 此代码应位于LoginActivity类的函数内。
And when you call the asynctask pass the object of LoginActivity to its constructor. 当你调用asynctask时，将LoginActivity的对象传递给它的构造函数。
after completion of the task use the object 完成任务后使用该对象
解决方案4
0 2013-01-02 10:02:07
Please use AsyncTask method like this: 请使用AsyncTask方法，如下所示：
private class ProcessLogin extends AsyncTask<String, String, String> {
private ProgressDialog dialog;
private ProgressDialog pDialog;
protected Context applicationContext;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(LoginActivity.this);
pDialog.setMessage("Loading User ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
inputUsername = (EditText) findViewById(R.id.loginUsername);
inputPassword = (EditText) findViewById(R.id.loginPassword);
String email = inputUsername.getText().toString();
String password = inputPassword.getText().toString();
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.loginUser(email, password);
Log.d("Button", "Login");
runOnUiThread(new Runnable() {
public void run() {
try {
if (json.getString(KEY_SUCCESS) != null) {
loginErrorMsg.setText("");
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
// user successfully logged in
// Store user details in SQLite Database
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
// Clear all previous data in database
userFunction.logoutUser(getApplicationContext());
db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));
// Launch Dashboard Screen
Intent dashboard = new Intent(getApplicationContext(), DatabaseSample.class);
// Close all views before launching Dashboard
dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(dashboard);
// Close Login Screen
finish();
}else{
// Error in login
loginErrorMsg.setText("Incorrect username/password");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return null;
}
@Override
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
}
}
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