Java 为什么我的片段在切换到景观时崩溃？
更具体地说，我制作了一个createaccount片段和一个login片段。在createaccount片段中切换到横向时，实际上会返回到login片段。然后，如果你试图切换回肖像，那么应用程序就会崩溃。我看过类似的问题，但我什么也看不出来。我真的很感谢你们的帮助 CreateAccountFragmentJava 为什么我的片段在切换到景观时崩溃？,java,android,android-fragments,orientation,Java,Android,Android Fragments,Orientation,更具体地说，我制作了一个createaccount片段和一个login片段。在createaccount片段中切换到横向时，实际上会返回到login片段。然后，如果你试图切换回肖像，那么应用程序就会崩溃。我看过类似的问题，但我什么也看不出来。我真的很感谢你们的帮助 CreateAccountFragment package com.keyconsultant.parse.logintutorial; /** * Create an Account. Username is the primar
package com.keyconsultant.parse.logintutorial;
/**
* Create an Account. Username is the primary method of login. Email is used for forgotten password recovery.
*
* @author Trey Robinson
*
*/
public class CreateAccountFragment extends BaseFragment implements OnClickListener {
protected static final String EXTRA_EMAIL = "com.keyconsultant.parse.logintutorial.fragment.extra.EMAIL";
protected static final String EXTRA_USERNAME = "com.keyconsultant.parse.logintutorial.fragment.extra.USERNAME";
protected static final String EXTRA_PASSWORD = "com.keyconsultant.parse.logintutorial.fragment.extra.PASSWORD";
protected static final String EXTRA_CONFIRM = "com.keyconsultant.parse.logintutorial.fragment.extra.CONFIRMPASSWORD";
private EditText mUserNameEditText;
private EditText mEmailEditText;
private EditText mPasswordEditText;
private EditText mConfirmPasswordEditText;
private Button mCreateAccountButton;
private String mEmail;
private String mUsername;
private String mPassword;
private String mConfirmPassword;
/**
* Factory method for creating fragment instances.
* @return
*/
public static CreateAccountFragment newInstance(){
return new CreateAccountFragment();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_create_account, container, false);
mUserNameEditText = (EditText)view.findViewById(R.id.etUsername);
mEmailEditText = (EditText)view.findViewById(R.id.etEmail);
mPasswordEditText = (EditText)view.findViewById(R.id.etPassword);
mConfirmPasswordEditText = (EditText)view.findViewById(R.id.etPasswordConfirm);
mCreateAccountButton = (Button)view.findViewById(R.id.btnCreateAccount);
mCreateAccountButton.setOnClickListener(this);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if(savedInstanceState != null){
mEmailEditText.setText(savedInstanceState.getString(EXTRA_EMAIL));
mUserNameEditText.setText(savedInstanceState.getString(EXTRA_USERNAME));
mPasswordEditText.setText(savedInstanceState.getString(EXTRA_PASSWORD));
mConfirmPasswordEditText.setText(savedInstanceState.getString(EXTRA_CONFIRM));
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString(EXTRA_EMAIL, mEmailEditText.getText().toString());
outState.putString(EXTRA_USERNAME, mUserNameEditText.getText().toString());
outState.putString(EXTRA_PASSWORD, mPasswordEditText.getText().toString());
outState.putString(EXTRA_CONFIRM, mConfirmPasswordEditText.getText().toString());
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnCreateAccount:
createAccount();
break;
default:
break;
}
}
/**
* Some front end validation is done that is not monitored by the service.
* If the form is complete then the information is passed to the service.
*/
private void createAccount(){
clearErrors();
boolean cancel = false;
View focusView = null;
// Store values at the time of the login attempt.
mEmail = mEmailEditText.getText().toString();
mUsername = mUserNameEditText.getText().toString();
mPassword = mPasswordEditText.getText().toString();
mConfirmPassword = mConfirmPasswordEditText.getText().toString();
// Check for a valid confirm password.
if (TextUtils.isEmpty(mConfirmPassword)) {
mConfirmPasswordEditText.setError(getString(R.string.error_field_required));
focusView = mConfirmPasswordEditText;
cancel = true;
} else if (mPassword != null && !mConfirmPassword.equals(mPassword)) {
mPasswordEditText.setError(getString(R.string.error_invalid_confirm_password));
focusView = mPasswordEditText;
cancel = true;
}
// Check for a valid password.
if (TextUtils.isEmpty(mPassword)) {
mPasswordEditText.setError(getString(R.string.error_field_required));
focusView = mPasswordEditText;
cancel = true;
} else if (mPassword.length() < 4) {
mPasswordEditText.setError(getString(R.string.error_invalid_password));
focusView = mPasswordEditText;
cancel = true;
}
// Check for a valid email address.
if (TextUtils.isEmpty(mEmail)) {
mEmailEditText.setError(getString(R.string.error_field_required));
focusView = mEmailEditText;
cancel = true;
} else if (!mEmail.contains("@")) {
mEmailEditText.setError(getString(R.string.error_invalid_email));
focusView = mEmailEditText;
cancel = true;
}
if (cancel) {
// There was an error; don't attempt login and focus the first
// form field with an error.
focusView.requestFocus();
} else {
// Show a progress spinner, and kick off a background task to
// perform the user login attempt.
UserManager.getInstance().signUp(mUsername.toLowerCase(Locale.getDefault()), mEmail, mPassword);
}
}
/**
* Remove error messages from all fields.
*/
private void clearErrors(){ mEmailEditText.setError(null);
mUserNameEditText.setError(null);
mPasswordEditText.setError(null);
mConfirmPasswordEditText.setError(null);
}
@Subscribe
public void onSignInError(AuthenticateUserErrorEvent event){
clearErrors();
switch (event.getErrorCode()) {
case ParseException.INVALID_EMAIL_ADDRESS:
mEmailEditText.setError(getString(R.string.error_invalid_email));
mEmailEditText.requestFocus();
break;
case ParseException.EMAIL_TAKEN:
mEmailEditText.setError(getString(R.string.error_duplicate_email));
mEmailEditText.requestFocus();
break;
case ParseException.USERNAME_TAKEN:
mUserNameEditText.setError(getString(R.string.error_duplicate_username));
mUserNameEditText.requestFocus();
break;
default:
UnknownErrorDialogFactory.createUnknownErrorDialog(this.getActivity()).show();
break;
}
}
}
01-10 16:09:05.796: I/Process(1923): Sending signal. PID: 1923 SIG: 9
01-10 17:00:57.513: I/Choreographer(1975): Skipped 111 frames! The application may be doing too much work on its main thread.
01-10 17:00:57.513: D/gralloc_goldfish(1975): Emulator without GPU emulation detected.
01-10 17:00:58.363: I/Choreographer(1975): Skipped 36 frames! The application may be doing too much work on its main thread.
01-10 17:00:58.833: I/Choreographer(1975): Skipped 37 frames! The application may be doing too much work on its main thread.
01-10 17:00:59.163: I/Choreographer(1975): Skipped 32 frames! The application may be doing too much work on its main thread.
01-10 17:01:11.253: D/dalvikvm(1975): GC_FOR_ALLOC freed 74K, 5% free 5533K/5820K, paused 2ms, total 3ms
01-10 17:01:11.253: I/dalvikvm-heap(1975): Grow heap (frag case) to 7.992MB for 2500620-byte allocation
01-10 17:01:11.263: D/dalvikvm(1975): GC_FOR_ALLOC freed 2K, 4% free 7972K/8264K, paused 2ms, total 3ms
01-10 17:01:11.273: D/dalvikvm(1975): GC_FOR_ALLOC freed <1K, 4% free 7972K/8264K, paused 3ms, total 4ms
01-10 17:01:11.273: I/dalvikvm-heap(1975): Grow heap (frag case) to 10.696MB for 2838540-byte allocation
01-10 17:01:11.283: D/dalvikvm(1975): GC_FOR_ALLOC freed 0K, 3% free 10744K/11040K, paused 4ms, total 4ms
01-10 17:01:15.953: D/dalvikvm(1975): GC_FOR_ALLOC freed 5268K, 45% free 6880K/12360K, paused 0ms, total 3ms
01-10 17:01:15.953: I/dalvikvm-heap(1975): Grow heap (frag case) to 8.489MB for 1642512-byte allocation
01-10 17:01:15.973: D/dalvikvm(1975): GC_FOR_ALLOC freed <1K, 32% free 8483K/12360K, paused 13ms, total 13ms
01-10 17:01:16.053: I/Choreographer(1975): Skipped 42 frames! The application may be doing too much work on its main thread.
01-10 17:01:17.473: I/Choreographer(1975): Skipped 58 frames! The application may be doing too much work on its main thread.
01-10 17:01:18.043: I/Choreographer(1975): Skipped 57 frames! The application may be doing too much work on its main thread.
01-10 17:01:23.363: D/AndroidRuntime(1975): Shutting down VM
01-10 17:01:23.363: W/dalvikvm(1975): threadid=1: thread exiting with uncaught exception (group=0xb0f2e648)
01-10 17:01:23.363: E/AndroidRuntime(1975): FATAL EXCEPTION: main
01-10 17:01:23.363: E/AndroidRuntime(1975): java.lang.NullPointerException
01-10 17:01:23.363: E/AndroidRuntime(1975): at com.keyconsultant.parse.logintutorial.LoginFragment.onSaveInstanceState(LoginFragment.java:119)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.support.v4.app.Fragment.performSaveInstanceState(Fragment.java:1607)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1587)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1655)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:527)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.Activity.performSaveInstanceState(Activity.java:1147)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1223)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3714)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.ActivityThread.access$700(ActivityThread.java:141)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.os.Handler.dispatchMessage(Handler.java:99)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.os.Looper.loop(Looper.java:137)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.ActivityThread.main(ActivityThread.java:5103)
01-10 17:01:23.363: E/AndroidRuntime(1975): at java.lang.reflect.Method.invokeNative(Native Method)
01-10 17:01:23.363: E/AndroidRuntime(1975): at java.lang.reflect.Method.invoke(Method.java:525)
01-10 17:01:23.363: E/AndroidRuntime(1975): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
01-10 17:01:23.363: E/AndroidRuntime(1975): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-10 17:01:23.363: E/AndroidRuntime(1975): at dalvik.system.NativeStart.main(Native Method)
您的日志猫显示您在LoginFragment.onSaveInstanceState中有问题 首先，将super.onSaveInstanceState设置为最后一行，而不是现在的第一行 然后确保没有mUserName和mPassword及其文本为空
初始化mUserName和密码文本到某个地方，错误应该消失，我想。你的日志中没有任何与崩溃相关的东西吗？01-10 16:09:01.806:W/dalvikvm1923:threadid=1:thread退出时未捕获异常组=0xb0f2e64801-10 16:09:01.806:E/AndroidRuntime1923:FATAL exception:main这有助于我不太熟悉在崩溃博物馆名称和登录片段中的mpassword？
package com.keyconsultant.parse.logintutorial;
/**
* Activity which displays a login screen to the user, offering registration as
* well. Based loosley on the default Login template.
*
* @author Trey Robinson
*/
public class LoginActivity extends BaseActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
Parse.initialize(this, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
fragmentTransaction
.replace(R.id.main_view, LoginFragment.newInstance());
fragmentTransaction.commit();
parseCache();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.activity_login, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.menu_forgot_password:
forgotPassword();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/**
* Open the forgotPassword dialog
*/
private void forgotPassword() {
FragmentManager fm = getSupportFragmentManager();
ForgotPasswordDialogFragment forgotPasswordDialog = new ForgotPasswordDialogFragment();
forgotPasswordDialog.show(fm, null);
}
@Subscribe
public void onSignInStart(AuthenticateUserStartEvent event) {
showProgress(true, getString(R.string.login_progress_signing_in));
}
@Subscribe
public void onSignInSuccess(AuthenticateUserSuccessEvent event) {
showProgress(false, getString(R.string.login_progress_signing_in));
Intent loginSuccess = new Intent(this, MainActivity.class);
startActivity(loginSuccess);
finish();
}
@Subscribe
public void onSignInError(AuthenticateUserErrorEvent event) {
showProgress(false, getString(R.string.login_progress_signing_in));
}
@Subscribe
public void onForgotPasswordStart(UserForgotPasswordStartEvent event) {
showProgress(true, getString(R.string.login_progress_signing_in));
}
@Subscribe
public void onForgotPasswordSuccess(UserForgotPasswordSuccessEvent event) {
showProgress(false, getString(R.string.login_progress_signing_in));
Toast toast = Toast.makeText(this,
"A password reset email has been sent.", Toast.LENGTH_LONG);
toast.show();
}
@Subscribe
public void onForgotPasswordError(UserForgotPasswordErrorEvent event) {
showProgress(false, getString(R.string.login_progress_signing_in));
Toast toast = Toast.makeText(this,
"An error has occured. Please try again.", Toast.LENGTH_LONG);
toast.show();
}
private void parseCache() {
Intent intent;
if (ParseUser.getCurrentUser() != null) {
intent = new Intent(this, MainActivity.class);
startActivity(intent);
this.finish();
}
}
}
01-10 16:09:05.796: I/Process(1923): Sending signal. PID: 1923 SIG: 9
01-10 17:00:57.513: I/Choreographer(1975): Skipped 111 frames! The application may be doing too much work on its main thread.
01-10 17:00:57.513: D/gralloc_goldfish(1975): Emulator without GPU emulation detected.
01-10 17:00:58.363: I/Choreographer(1975): Skipped 36 frames! The application may be doing too much work on its main thread.
01-10 17:00:58.833: I/Choreographer(1975): Skipped 37 frames! The application may be doing too much work on its main thread.
01-10 17:00:59.163: I/Choreographer(1975): Skipped 32 frames! The application may be doing too much work on its main thread.
01-10 17:01:11.253: D/dalvikvm(1975): GC_FOR_ALLOC freed 74K, 5% free 5533K/5820K, paused 2ms, total 3ms
01-10 17:01:11.253: I/dalvikvm-heap(1975): Grow heap (frag case) to 7.992MB for 2500620-byte allocation
01-10 17:01:11.263: D/dalvikvm(1975): GC_FOR_ALLOC freed 2K, 4% free 7972K/8264K, paused 2ms, total 3ms
01-10 17:01:11.273: D/dalvikvm(1975): GC_FOR_ALLOC freed <1K, 4% free 7972K/8264K, paused 3ms, total 4ms
01-10 17:01:11.273: I/dalvikvm-heap(1975): Grow heap (frag case) to 10.696MB for 2838540-byte allocation
01-10 17:01:11.283: D/dalvikvm(1975): GC_FOR_ALLOC freed 0K, 3% free 10744K/11040K, paused 4ms, total 4ms
01-10 17:01:15.953: D/dalvikvm(1975): GC_FOR_ALLOC freed 5268K, 45% free 6880K/12360K, paused 0ms, total 3ms
01-10 17:01:15.953: I/dalvikvm-heap(1975): Grow heap (frag case) to 8.489MB for 1642512-byte allocation
01-10 17:01:15.973: D/dalvikvm(1975): GC_FOR_ALLOC freed <1K, 32% free 8483K/12360K, paused 13ms, total 13ms
01-10 17:01:16.053: I/Choreographer(1975): Skipped 42 frames! The application may be doing too much work on its main thread.
01-10 17:01:17.473: I/Choreographer(1975): Skipped 58 frames! The application may be doing too much work on its main thread.
01-10 17:01:18.043: I/Choreographer(1975): Skipped 57 frames! The application may be doing too much work on its main thread.
01-10 17:01:23.363: D/AndroidRuntime(1975): Shutting down VM
01-10 17:01:23.363: W/dalvikvm(1975): threadid=1: thread exiting with uncaught exception (group=0xb0f2e648)
01-10 17:01:23.363: E/AndroidRuntime(1975): FATAL EXCEPTION: main
01-10 17:01:23.363: E/AndroidRuntime(1975): java.lang.NullPointerException
01-10 17:01:23.363: E/AndroidRuntime(1975): at com.keyconsultant.parse.logintutorial.LoginFragment.onSaveInstanceState(LoginFragment.java:119)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.support.v4.app.Fragment.performSaveInstanceState(Fragment.java:1607)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1587)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1655)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:527)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.Activity.performSaveInstanceState(Activity.java:1147)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1223)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3714)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.ActivityThread.access$700(ActivityThread.java:141)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.os.Handler.dispatchMessage(Handler.java:99)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.os.Looper.loop(Looper.java:137)
01-10 17:01:23.363: E/AndroidRuntime(1975): at android.app.ActivityThread.main(ActivityThread.java:5103)
01-10 17:01:23.363: E/AndroidRuntime(1975): at java.lang.reflect.Method.invokeNative(Native Method)
01-10 17:01:23.363: E/AndroidRuntime(1975): at java.lang.reflect.Method.invoke(Method.java:525)
01-10 17:01:23.363: E/AndroidRuntime(1975): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
01-10 17:01:23.363: E/AndroidRuntime(1975): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-10 17:01:23.363: E/AndroidRuntime(1975): at dalvik.system.NativeStart.main(Native Method)