添加进度对话框asynctask Android登录
[英]add progress dialog asynctask Android Login
问题描述
我试试这个教程
使用PHP，MySQL和SQLite登录，它的工作原理。
但我想在登录进行时添加progressdialog。
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();
}
}
});
}
}
在我用asyntask编辑之后
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
}
}
我尝试运行但错误。
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)
如何在我的登录活动中添加进度对话框？
BR
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：只有创建视图层次结构的原始线程才能触及其视图。
因为目前您正在尝试从ProcessLogin AsyncTask doInBackground访问UI元素。
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
问题在于以下几行：
loginErrorMsg.setText("");
loginErrorMsg.setText("Incorrect username/password");
您无法从非UI线程更新UI。 由于doInBackground()在非UI线程中执行，因此您无法从该方法更新UI。
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();
此代码应位于LoginActivity类的函数内。
当你调用asynctask时，将LoginActivity的对象传递给它的构造函数。
完成任务后使用该对象
解决方案4
0 2013-01-02 10:02:07
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
}
}
Android AsyncTask和进度对话框
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