我一直在尝试做所有事情，但没有任何效果，我想通过单击按钮从 LogInActivity 传递到 RegisterUserActivity，但它不起作用.
我得到一个 java.lang.RuntimeException，请帮忙，这是我的代码:
登录 Activity :
public class LoginActivity extends Activity implements View.OnClickListener{
private static final String LOGIN_URL = "http://ucwm.co.nf/UsuarioLogin_app.php";
// Email, password edittext
EditText txtUsername;
EditText txtPassword;
Button btnReg;
// login button
Button btnLogin;
// Alert Dialog Manager
AlertDialogManager alert = new AlertDialogManager();
// Session Manager Class
SessionManager session;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login_layout);
// Session Manager
session = new SessionManager(getApplicationContext());
// Email, Password input text
txtUsername = (EditText) findViewById(R.id.userName);
txtPassword = (EditText) findViewById(R.id.passwordUser);
Toast.makeText(getApplicationContext(), "User Login Status: " + session.isLoggedIn(), Toast.LENGTH_LONG).show();
if(session.isLoggedIn()){
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
finish();
}
// Login button
btnLogin = (Button) findViewById(R.id.loginButton);
btnLogin.setOnClickListener(this);
btnReg=(Button)findViewById(R.id.btnReg);
btnReg.setOnClickListener(this);
}
private void login(){
String username = txtUsername.getText().toString().trim();
String password = txtPassword.getText().toString().trim();
userLogin(username, password);
}
private void userLogin(final String username, final String password){
class UserLoginClass extends AsyncTask<String,Void,String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
if (username.trim().length() > 0 && password.trim().length() > 0){
if (s.equalsIgnoreCase("exito")) {
// Creating user login session
// For testing i am stroing name, email as follow
// Use user real data
session.createLoginSession(username);
// set
((Usuario) getApplication()).setSomeVariable(username);
// Staring MainActivity
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
finish();
} else {
//Error en username o password
alert.showAlertDialog(LoginActivity.this, "Fallo inicio de sesión..", "Usuario o Contraseña incorrecto", false);
}
}
else{
// user didn't entered username or password
// Show alert asking him to enter the details
alert.showAlertDialog(LoginActivity.this, "Fallo inicio de sesión..", "Porfavor ingrese usuario y contraseña", false);
}
}
@Override
protected String doInBackground(String... params) {
HashMap<String,String> data = new HashMap<>();
data.put("username",params[0]);
data.put("contrasenia",params[1]);
RegisterUserClass ruc = new RegisterUserClass();
String result = ruc.sendPostRequest(LOGIN_URL,data);
return result;
}
}
UserLoginClass ulc = new UserLoginClass();
ulc.execute(username, password);
}
@Override
public void onClick(View v) {
if(v == btnLogin){
SharedPreferences preferences = this.getSharedPreferences("PREFERENCE", 0);
SharedPreferences.Editor editor = preferences.edit();
editor.putBoolean("PREFERENCE",true);
login();
}
if(v==btnReg){
Intent i = new Intent(getApplicationContext(), RegisterUserAcivity.class);
startActivity(i);
finish();
}
}
}
注册用户 Activity :
public class RegisterUserAcivity extends AppCompatActivity implements View.OnClickListener{
private RadioGroup radioPrefijo;
private RadioButton radioPre;
private EditText editTextName;
private EditText editTextUsername;
private EditText editTextPassword;
private EditText editTextEmail;
private EditText editTextDate;
private EditText editTextLastName;
private EditText editTextTelefone;
Calendar myCalendar = Calendar.getInstance();
String prefijo;
private Button buttonRegister;
private static final String REGISTER_URL = "http://ucwm.co.nf/UsuarioRegister_app.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register_layout);
editTextName = (EditText) findViewById(R.id.editTextNombre);
editTextUsername = (EditText) findViewById(R.id.editTextUsername);
editTextPassword = (EditText) findViewById(R.id.editTextContrasenia);
editTextTelefone = (EditText) findViewById(R.id.editTextTelefono);
editTextEmail = (EditText) findViewById(R.id.editTextEmail);
editTextDate = (EditText) findViewById(R.id.editTextFechaNac);
editTextLastName = (EditText) findViewById(R.id.editTextApellido);
buttonRegister = (Button) findViewById(R.id.btnRegistro);
addListenerOnButton();
buttonRegister.setOnClickListener(this);
editTextDate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new DatePickerDialog(RegisterUserAcivity.this, date, myCalendar
.get(Calendar.YEAR), myCalendar.get(Calendar.MONTH),
myCalendar.get(Calendar.DAY_OF_MONTH)).show();
}
});
}
@Override
public void onClick(View v) {
if(v == buttonRegister){
registerUser();
finish();
}
}
private void registerUser() {
String name = editTextName.getText().toString();
String lastName = editTextLastName.getText().toString().trim();
String username = editTextUsername.getText().toString().trim();
String password = editTextPassword.getText().toString().trim();
String telefono = editTextTelefone.getText().toString().trim();
String email = editTextEmail.getText().toString().trim().toLowerCase();
String date = editTextDate.getText().toString().trim().toLowerCase();
String pref= prefijo;
register(username,password,name,lastName,date,email,telefono,pref);
}
private void register(String username,String password,String name,String lastName,String date,String email,String telefono,String pref) {
class RegisterUser extends AsyncTask<String, Void, String>{
ProgressDialog loading;
RegisterUserClass ruc = new RegisterUserClass();
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
}
@Override
protected String doInBackground(String... params) {
HashMap<String, String> data = new HashMap<String,String>();
data.put("username",params[0]);
data.put("password",params[1]);
data.put("name",params[2]);
data.put("lastname",params[3]);
data.put("date",params[4]);
data.put("email",params[5]);
data.put("telefono",params[6]);
data.put("prefijo",params[7]);
String result = ruc.sendPostRequest(REGISTER_URL,data);
return result;
}
}
RegisterUser ru = new RegisterUser();
ru.execute(username,password,name,lastName,date,email,telefono,pref);
}
public void addListenerOnButton() {
radioPrefijo = (RadioGroup) findViewById(R.id.radioPref);
int p = radioPrefijo.getCheckedRadioButtonId();
radioPre = (RadioButton) findViewById(p);
prefijo = radioPre.getText().toString();
}
DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
// TODO Auto-generated method stub
myCalendar.set(Calendar.YEAR, year);
myCalendar.set(Calendar.MONTH, monthOfYear);
myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
updateLabel();
}
};
private void updateLabel() {
String myFormat = "yy-MM-dd"; //In which you need put here
SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US);
editTextDate.setText(sdf.format(myCalendar.getTime()));
}
}
登录 Activity xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/userName"
android:hint="Usuario"
android:layout_above="@+id/textView14"
android:layout_alignLeft="@+id/textView14"
android:layout_alignStart="@+id/textView14"
android:layout_marginBottom="41dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:id="@+id/passwordUser"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:hint="Contraseña"
android:editable="false"
android:enabled="true"
android:inputType="textPassword" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Iniciar Sesión"
android:id="@+id/loginButton"
android:layout_marginTop="40dp"
android:layout_below="@+id/passwordUser"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ingrese Usuario"
android:id="@+id/textView12"
android:layout_above="@+id/userName"
android:layout_alignLeft="@+id/userName"
android:layout_alignStart="@+id/userName" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ingrese Contresña"
android:id="@+id/textView14"
android:layout_above="@+id/passwordUser"
android:layout_alignLeft="@+id/passwordUser"
android:layout_alignStart="@+id/passwordUser" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Registrarse"
android:id="@+id/btnReg"
android:layout_below="@+id/loginButton"
android:layout_alignLeft="@+id/loginButton"
android:layout_alignStart="@+id/loginButton" />
RegisterActivity xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Nombre (s)"
android:id="@+id/textView15"
android:layout_marginTop="20dp"
android:layout_alignParentTop="true"
android:layout_alignLeft="@+id/textView18"
android:layout_alignStart="@+id/textView18" />
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/editTextNombre"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Apellido (s)"
android:id="@+id/textView16"
android:layout_below="@+id/editTextNombre"
android:layout_centerHorizontal="true" />
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/editTextApellido"
android:layout_below="@+id/textView16"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Nombre de Usuario"
android:id="@+id/textView17"
android:layout_below="@+id/editTextApellido"
android:layout_centerHorizontal="true" />
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/editTextUsername"
android:layout_below="@+id/textView17"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Contraseña"
android:id="@+id/textView21" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:ems="10"
android:id="@+id/editTextContrasenia" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Teléfono"
android:id="@+id/textView18"
android:layout_below="@+id/editTextTelefono"
android:layout_alignRight="@+id/textView20"
android:layout_alignEnd="@+id/textView20" />
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/editTextTelefono"
android:layout_below="@+id/textView20"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Fecha de Nacimiento"
android:id="@+id/textView19"
android:layout_below="@+id/editTextFechaNac"
android:layout_centerHorizontal="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="date"
android:ems="10"
android:id="@+id/editTextFechaNac" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Correo"
android:id="@+id/textView20"
android:layout_below="@+id/editTextUsername"
android:layout_centerHorizontal="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:ems="10"
android:id="@+id/editTextEmail" />
<RadioGroup
android:id="@+id/radioPref"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Usuario"
android:id="@+id/radioButtonUser"
android:layout_alignTop="@+id/radioButtonMedic"
android:layout_toRightOf="@+id/editTextNombre"
android:layout_toEndOf="@+id/editTextNombre"
android:checked="false" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="20dp"
android:text="Médico"
android:id="@+id/radioButtonMedic"
android:layout_alignParentBottom="true"
android:layout_toLeftOf="@+id/editTextNombre"
android:layout_toStartOf="@+id/editTextNombre"
android:checked="false" />
</RadioGroup>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Registrarse"
android:id="@+id/btnRegistro"
android:layout_below="@+id/radioButtonUser"
android:layout_centerHorizontal="true"
android:layout_marginTop="35dp" />
</LinearLayout>
list
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.juanisaac.unidascontigoac">
<!--PERMISOS-->
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<!--ICONO DE LA APP-->
<application
android:name="Usuario"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:largeHeap="true">
<activity
android:name=".LoginActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- DashBoard / MainActivity -->
<activity
android:name=".MainActivity"
android:screenOrientation="portrait">
</activity>
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings">
</activity>
<activity
android:name=".TestimoniosDetallados"
android:label="Testimonios Detallados">
</activity>
<activity
android:name=".AniadirForo"
android:label="Añadir Foro">
</activity>
<activity
android:name=".ForoDetallado"
android:label="Foro Detallado">
</activity>
<activity
android:name=".EventoDetallado"
android:label="Evento Detallado">
</activity>
<activity
android:name=".RegisterUserAcivity"
android:label="Register Activity">
</activity>
<!--
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings" >
</activity>
-->
</application>
这是它显示的 LOGCAT:
11-27 00:36:01.540 24273-24273/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ Late-enabling CheckJNI
11-27 00:36:02.540 24273-24273/com.example.juanisaac.unidascontigoac D/libEGL﹕ loaded /system/lib/egl/libEGL_genymotion.so
11-27 00:36:02.576 24273-24273/com.example.juanisaac.unidascontigoac D/﹕ HostConnection::get() New Host Connection established 0xb80bc298, tid 24273
11-27 00:36:02.604 24273-24273/com.example.juanisaac.unidascontigoac D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_genymotion.so
11-27 00:36:02.608 24273-24273/com.example.juanisaac.unidascontigoac D/libEGL﹕ loaded /system/lib/egl/libGLESv2_genymotion.so
11-27 00:36:03.036 24273-24273/com.example.juanisaac.unidascontigoac W/EGL_genymotion﹕ eglSurfaceAttrib not implemented
11-27 00:36:03.060 24273-24273/com.example.juanisaac.unidascontigoac D/OpenGLRenderer﹕ Enabling debug mode 0
11-27 00:37:54.167 24273-24273/com.example.juanisaac.unidascontigoac I/Choreographer﹕ Skipped 36 frames! The application may be doing too much work on its main thread.
11-27 00:37:54.307 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;)
11-27 00:37:54.323 24273-24273/com.example.juanisaac.unidascontigoac I/dalvikvm﹕ Could not find method android.view.Window$Callback.onSearchRequested, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onSearchRequested
11-27 00:37:54.323 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ VFY: unable to resolve interface method 15466: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z
11-27 00:37:54.327 24273-24273/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ VFY: replacing opcode 0x72 at 0x0002
11-27 00:37:54.335 24273-24273/com.example.juanisaac.unidascontigoac I/dalvikvm﹕ Could not find method android.view.Window$Callback.onWindowStartingActionMode, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onWindowStartingActionMode
11-27 00:37:54.339 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ VFY: unable to resolve interface method 15470: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
11-27 00:37:54.339 24273-24273/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ VFY: replacing opcode 0x72 at 0x0002
11-27 00:37:54.407 24273-24273/com.example.juanisaac.unidascontigoac I/dalvikvm﹕ Could not find method android.content.res.Resources.getDrawable, referenced from method android.support.v7.internal.widget.ResourcesWrapper.getDrawable
11-27 00:37:54.407 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ VFY: unable to resolve virtual method 405: Landroid/content/res/Resources;.getDrawable (ILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
11-27 00:37:54.411 24273-24273/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
11-27 00:37:54.415 24273-24273/com.example.juanisaac.unidascontigoac I/dalvikvm﹕ Could not find method android.content.res.Resources.getDrawableForDensity, referenced from method android.support.v7.internal.widget.ResourcesWrapper.getDrawableForDensity
11-27 00:37:54.419 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ VFY: unable to resolve virtual method 407: Landroid/content/res/Resources;.getDrawableForDensity (IILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
11-27 00:37:54.423 24273-24273/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
11-27 00:37:54.463 24273-24276/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ GC_CONCURRENT freed 221K, 3% free 8787K/9036K, paused 6ms+6ms, total 25ms
11-27 00:37:54.479 24273-24273/com.example.juanisaac.unidascontigoac D/AndroidRuntime﹕ Shutting down VM
11-27 00:37:54.483 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xa6195908)
11-27 00:37:54.487 24273-24273/com.example.juanisaac.unidascontigoac E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.juanisaac.unidascontigoac/com.example.juanisaac.unidascontigoac.RegisterUserAcivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.juanisaac.unidascontigoac.RegisterUserAcivity.addListenerOnButton(RegisterUserAcivity.java:143)
at com.example.juanisaac.unidascontigoac.RegisterUserAcivity.onCreate(RegisterUserAcivity.java:58)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
11-27 00:37:57.967 24273-24273/com.example.juanisaac.unidascontigoac I/Process﹕ Sending signal. PID: 24273 SIG: 9
最佳答案
这里:
prefijo = radioPre.getText().toString();
导致问题的行，因为 radioPre 是 null。
getCheckedRadioButtonId()方法返回 -1 如果未选中 RadioGroup 中的 RadioButton。
因此在当前的 RadioGroup xml 中，所有 RadioButton android:checked 属性都设置为 android:checked="false" 因此 RadioGroup 和 getCheckedRadioButtonId 中没有可用的选中 RadioButton () 将返回 -1。
要解决当前问题，请在访问 RadioButton 之前添加 if 条件:
if(p !=-1){
radioPre = (RadioButton) findViewById(p);
prefijo = radioPre.getText().toString();
}
关于java.lang.RuntimeException : Unable to start activity, 传递给另一个 Activity ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33951676/