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我正在嘗試使用AsyncTask和PHP/MySQL對Android登錄活動進行編碼。在Android上使用AsyncTask時出錯登錄活動
我得到這個logcat的：
10-30 17:27:28.708 17111-17111/com.android.fer.prototipo I/SELinux﹕ Function: selinux_android_load_priority [0], There is no sepolicy file.
10-30 17:27:28.708 17111-17111/com.android.fer.prototipo I/SELinux﹕ Function: selinux_android_load_priority , loading version is VE=SEPF_SGH-I337M_4.4.2_0017
10-30 17:27:28.708 17111-17111/com.android.fer.prototipo I/SELinux﹕ selinux_android_seapp_context_reload: seapp_contexts file is loaded from /data/security/spota/seapp_contexts
10-30 17:27:28.718 17111-17111/com.android.fer.prototipo D/dalvikvm﹕ Late-enabling CheckJNI
10-30 17:27:29.178 17111-17111/com.android.fer.prototipo W/ApplicationPackageManager﹕ getCSCPackageItemText()
10-30 17:27:29.278 17111-17111/com.android.fer.prototipo I/Adreno-EGL﹕ <qeglDrvAPI_eglInitialize:381>: EGL 1.4 QUALCOMM build: (CL3869936)
OpenGL ES Shader Compiler Version: 17.01.11.SPL
Build Date: 01/17/14 Fri
Local Branch:
Remote Branch:
Local Patches:
Reconstruct Branch:
10-30 17:27:29.338 17111-17111/com.android.fer.prototipo D/OpenGLRenderer﹕ Enabling debug mode 0
10-30 17:27:45.104 17111-17111/com.android.fer.prototipo D/ProgressBar﹕ updateDrawableBounds: left = 0
10-30 17:27:45.104 17111-17111/com.android.fer.prototipo D/ProgressBar﹕ updateDrawableBounds: top = 0
10-30 17:27:45.104 17111-17111/com.android.fer.prototipo D/ProgressBar﹕ updateDrawableBounds: right = 144
10-30 17:27:45.104 17111-17111/com.android.fer.prototipo D/ProgressBar﹕ updateDrawableBounds: bottom = 144
10-30 17:27:45.864 17111-17444/com.android.fer.prototipo W/dalvikvm﹕ threadid=14: thread exiting with uncaught exception (group=0x4192eda0)
10-30 17:27:45.884 17111-17111/com.android.fer.prototipo D/ProgressBar﹕ updateDrawableBounds: left = 0
10-30 17:27:45.884 17111-17111/com.android.fer.prototipo D/ProgressBar﹕ updateDrawableBounds: top = 0
10-30 17:27:45.884 17111-17444/com.android.fer.prototipo E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #2
Process: com.android.fer.prototipo, PID: 17111
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.NullPointerException
at org.apache.http.impl.client.AbstractHttpClient.determineTarget(AbstractHttpClient.java:518)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:509)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
at com.android.fer.prototipo.library.JSONParser.getJSONFromUrl(JSONParser.java:38)
at com.android.fer.prototipo.library.UserFunctions.loginUser(UserFunctions.java:28)
at com.android.fer.prototipo.Login$ProcessLogin.doInBackground(Login.java:152)
at com.android.fer.prototipo.Login$ProcessLogin.doInBackground(Login.java:132)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
10-30 17:27:45.894 17111-17111/com.android.fer.prototipo D/ProgressBar﹕ updateDrawableBounds: right = 144
10-30 17:27:45.894 17111-17111/com.android.fer.prototipo D/ProgressBar﹕ updateDrawableBounds: bottom = 144
10-30 17:27:45.894 17111-17111/com.android.fer.prototipo E/ViewRootImpl﹕ sendUserActionEvent() mView == null
10-30 17:27:46.825 17111-17111/com.android.fer.prototipo E/WindowManager﹕ android.view.WindowLeaked: Activity com.android.fer.prototipo.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{42d48840 V.E..... R......D 0,0-1026,486} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:457)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:267)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:288)
at com.android.fer.prototipo.Login$ProcessLogin.onPreExecute(Login.java:147)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
at android.os.AsyncTask.execute(AsyncTask.java:535)
at com.android.fer.prototipo.Login$NetCheck.onPostExecute(Login.java:120)
at com.android.fer.prototipo.Login$NetCheck.onPostExecute(Login.java:78)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5356)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
at dalvik.system.NativeStart.main(Native Method)
10-30 17:27:47.786 17111-17444/com.android.fer.prototipo I/Process﹕ Sending signal. PID: 17111 SIG: 9
我已經固定了很多錯誤的自己，但是這個人真的困住我，繼承人一些代碼，我認爲這是個問題：
public class Login extends Activity {
Button btnLogin;
EditText inputUsername;
EditText inputPassword;
private TextView loginErrorMsg;
private static String KEY_SUCCESS = "success";
private static String KEY_ID = "id";
private static String KEY_USERNAME = "username";
private static String KEY_FIRSTNAME = "fname";
private static String KEY_LASTNAME = "lname";
private static String KEY_LASTNAME2 = "lname2";
private static String KEY_EMAIL = "email";
private static String KEY_STATUS = "status";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
inputUsername = (EditText) findViewById(R.id.username);
inputPassword = (EditText) findViewById(R.id.password);
btnLogin = (Button) findViewById(R.id.btn_login);
loginErrorMsg = (TextView) findViewById(R.id.loginErrorMsg);
/*
* Evento para boton Login.
* Se utiliza Toast para alertas cuando hay campos vacios
**/
btnLogin.setOnClickListener(new View.OnClickListener(){
public void onClick(View view){
if((!inputUsername.getText().toString().equals("")) && (!inputPassword.getText().toString().equals(""))){
NetAsync(view);
}
else if((!inputUsername.getText().toString().equals(""))){
Toast.makeText(getApplicationContext(),"Campo de contraseña vacío", Toast.LENGTH_SHORT).show();
}
else if((!inputPassword.getText().toString().equals(""))){
Toast.makeText(getApplicationContext(),"Campo de matrícula vacío", Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(getApplicationContext(), "Campos de matrícula y contraseña vacíos", Toast.LENGTH_SHORT).show();
}
}
});
}
/*Verificar conexion a internet
* */
private class NetCheck extends AsyncTask<String, Void, Boolean>{
private ProgressDialog nDialog;
@Override
protected void onPreExecute(){
super.onPreExecute();
nDialog = new ProgressDialog(Login.this);
nDialog.setTitle("Verificando Conexión");
nDialog.setMessage("Verificando..");
nDialog.setIndeterminate(false);
nDialog.setCancelable(true);
nDialog.show();
}
@Override
protected Boolean doInBackground(String... args){
/*Establecemos conexion con google para verificar que tengamos internet*/
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if(netInfo != null && netInfo.isConnected()){
try{
URL url = new URL("http://www.google.com");
HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
urlc.setConnectTimeout(3000);
urlc.connect();
if(urlc.getResponseCode() == 200){
return true;
}
}catch (MalformedURLException e1){
//TODO Auto-generated catch block
e1.printStackTrace();
}catch (IOException e){
//TODO Auto-generated catch block
e.printStackTrace();
}
}
return false;
}
@Override
protected void onPostExecute(Boolean th){
if(th == true){
nDialog.dismiss();
new ProcessLogin().execute();
}
else{
nDialog.dismiss();
loginErrorMsg.setText("Error en conexión a internet");
}
}
}
/*
Async Task para conectarse con BD MySQL a traves de JSON
*/
private class ProcessLogin extends AsyncTask<String, Void, JSONObject>{
private ProgressDialog pDialog;
String username , password;
@Override
protected void onPreExecute(){
super.onPreExecute();
inputUsername = (EditText) findViewById(R.id.username);
inputPassword = (EditText) findViewById(R.id.password);
username = inputUsername.getText().toString();
password = inputPassword.getText().toString();
pDialog = new ProgressDialog(Login.this);
pDialog.setTitle("Conectando a servidores");
pDialog.setMessage("Iniciando sesión..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args){
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.loginUser(username,password);
return json;
}
@Override
protected void onPostExecute(JSONObject json){
try {
if (json.getString(KEY_SUCCESS) != null){
String res = json.getString(KEY_SUCCESS);
if (Integer.parseInt(res) == 1){
pDialog.setMessage("Cargando perfil de usuario");
pDialog.setTitle("Obteniendo información");
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
/*Limpiar datos en SQlite*/
UserFunctions logout = new UserFunctions();
logout.logoutUser(getApplicationContext());
db.addUser(json_user.getString(KEY_FIRSTNAME),json_user.getString(KEY_LASTNAME),json_user.getString(KEY_LASTNAME2), json_user.getString(KEY_EMAIL),json_user.getString(KEY_USERNAME),json_user.getString(KEY_ID),json_user.getString(KEY_STATUS));
/*
Si arreglo JSON esta almacenado en SQlite lanza el panel de usuario
*/
pDialog.dismiss();
Intent upanel = new Intent(getApplicationContext(),Main.class);
upanel.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
pDialog.dismiss();
startActivity(upanel);
finish();
}else{
pDialog.dismiss();
loginErrorMsg.setText("Datos incorrectos");
}
}
}catch (JSONException e){
e.printStackTrace();
}
}
}
public void NetAsync(View view){
new NetCheck().execute();
}
調查的空指針異常，您的通話JSON看起來 – 2014-10-31 00:54:05