Android程序崩溃
我的应用程序正常工作正常，但如果它在后台运行一段时间，或者使用了任务杀手，如果在某个片段上中断，它会在启动时崩溃，在我的程序中，该片段称为infofragment。以下是每次碰撞的logcat信息：Android程序崩溃,android,debugging,crash,fragment,Android,Debugging,Crash,Fragment,我的应用程序正常工作正常，但如果它在后台运行一段时间，或者使用了任务杀手，如果在某个片段上中断，它会在启动时崩溃，在我的程序中，该片段称为infofragment。以下是每次碰撞的logcat信息： 02-25 21:12:23.546: E/AndroidRuntime(20048): FATAL EXCEPTION: main 02-25 21:12:23.546: E/AndroidRuntime(20048): java.lang.RuntimeException: Unable to
02-25 21:12:23.546: E/AndroidRuntime(20048): FATAL EXCEPTION: main
02-25 21:12:23.546: E/AndroidRuntime(20048): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.fragments/com.example.android.fragments.MainActivity}: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.android.fragments.InfoFragment: make sure class name exists, is public, and has an empty constructor that is public
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2088)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2113)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.app.ActivityThread.access$700(ActivityThread.java:139)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1224)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.os.Handler.dispatchMessage(Handler.java:99)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.os.Looper.loop(Looper.java:137)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.app.ActivityThread.main(ActivityThread.java:4918)
02-25 21:12:23.546: E/AndroidRuntime(20048): at java.lang.reflect.Method.invokeNative(Native Method)
02-25 21:12:23.546: E/AndroidRuntime(20048): at java.lang.reflect.Method.invoke(Method.java:511)
02-25 21:12:23.546: E/AndroidRuntime(20048): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
02-25 21:12:23.546: E/AndroidRuntime(20048): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
02-25 21:12:23.546: E/AndroidRuntime(20048): at dalvik.system.NativeStart.main(Native Method)
02-25 21:12:23.546: E/AndroidRuntime(20048): Caused by: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.android.fragments.InfoFragment: make sure class name exists, is public, and has an empty constructor that is public
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.support.v4.app.Fragment.instantiate(Fragment.java:395)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.support.v4.app.FragmentState.instantiate(Fragment.java:96)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1726)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:198)
02-25 21:12:23.546: E/AndroidRuntime(20048): at com.example.android.fragments.MainActivity.onCreate(MainActivity.java:49)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.app.Activity.performCreate(Activity.java:5048)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2052)
02-25 21:12:23.546: E/AndroidRuntime(20048): ... 11 more
02-25 21:12:23.546: E/AndroidRuntime(20048): Caused by: java.lang.InstantiationException: can't instantiate class com.example.android.fragments.InfoFragment; no empty constructor
02-25 21:12:23.546: E/AndroidRuntime(20048): at java.lang.Class.newInstanceImpl(Native Method)
02-25 21:12:23.546: E/AndroidRuntime(20048): at java.lang.Class.newInstance(Class.java:1319)
02-25 21:12:23.546: E/AndroidRuntime(20048): at android.support.v4.app.Fragment.instantiate(Fragment.java:384)
02-25 21:12:23.546: E/AndroidRuntime(20048): ... 18 more
public class MainActivity extends FragmentActivity
implements MainListFragment.OnListSelectedListener {
MainListFragment tempmainfrag;
InfoFragment infofrag;
int mainPosition = -1;
MenuItem menuItemAdd; //plus button in ActionBar/options menu
boolean menucreated = false;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainlayout);
// Check whether the activity is using the layout version with
// the fragment_container FrameLayout. If so, we must add the first fragment
if (findViewById(R.id.fragment_container) != null) { //meaning, if using phone version
// Create an instance of MainListFragment
tempmainfrag = new MainListFragment(); //made a context parameter to pass the context
// In case this activity was started with special instructions from an Intent,
// pass the Intent's extras to the fragment as arguments
tempmainfrag.setArguments(getIntent().getExtras());
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.replace(R.id.fragment_container, tempmainfrag).commit();
Log.i("mydebug","TEMPMAINFRAG: " + tempmainfrag);
}
}
@Override
public void onResume()
{
super.onResume();
}
@Override
public void onStart()
{
Log.i("mydebug","1");
if(menuItemAdd != null)
menuItemAdd.setVisible(true); //turns on menu item 'add'
super.onStart();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
menuItemAdd = menu.findItem(R.id.menu_add);
menucreated = true;
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_add: //NEED TO IMPLEMENT: MAKES ICON PRESS FOR BACK GO BACK
// Create fragment
infofrag = new InfoFragment(menuItemAdd);
Bundle args = new Bundle();
args.putBoolean(infofrag.ARG_NEW, true);
infofrag.setArguments(args);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack so the user can navigate back
transaction.replace(R.id.fragment_container, infofrag);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void onItemSelected(int position, String schedulename, String[] ampm, boolean[] days, int[] times, boolean vibrate) {
// The user selected a list item
//////////////////////////////TWO PANE LAYOUT STUFF///////////////////////////////////
// Capture the article fragment from the activity layout
// InfoFragment articleFrag = (InfoFragment)
// getSupportFragmentManager().findFragmentById(R.id.article_fragment); //article_fragment exists in layout-large
//
// if (articleFrag != null) {
// // If article frag is available, we're in two-pane layout...
//
// // Call a method in the ArticleFragment to update its content
// articleFrag.updateArticleView(position);
//
// } else {
// phone layout - swap frags
mainPosition = position;
// Create fragment and give it an argument for the selected article
infofrag = new InfoFragment(menuItemAdd);
Bundle args = new Bundle();
args.putInt(infofrag.ARG_POSITION, position);
//new stuff to add info
args.putString(infofrag.ARG_NAME, schedulename);
args.putBooleanArray(infofrag.ARG_DAYS, days);
args.putIntArray(infofrag.ARG_TIMES, times);
args.putBoolean(infofrag.ARG_VIBRATE, vibrate);
args.putStringArray(infofrag.ARG_AMPM, ampm);
args.putBoolean(infofrag.ARG_NEW, false);
infofrag.setArguments(args);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack so the user can navigate back
transaction.replace(R.id.fragment_container, infofrag);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
public void saveButtonClicked(View view) { //pass the click to the mainlistfragment
// MainListFragment tempmainfrag2 = (MainListFragment)getSupportFragmentManager().
// findFragmentById(R.id.fragment_container);
Log.i("mydebug","TEMPMAINFRAG: " + tempmainfrag);
if(!infofrag.newsched) //if existing schedule, so save
{
Log.i("mydebug","Saving schedule...");
boolean redo = false; //is set true every time info isnt correct when trying to save schedule
//create toast
Toast toast;
//get title
EditText titletext = (EditText)this.findViewById(R.id.titletext);
//get checkboxes
CheckBox check1 = (CheckBox)this.findViewById(R.id.monbox); //recreate checkboxes from view in activity (doesnt extend Activity
CheckBox check2 = (CheckBox)this.findViewById(R.id.tuebox); //so use getActivity())
CheckBox check3 = (CheckBox)this.findViewById(R.id.wedbox);
CheckBox check4 = (CheckBox)this.findViewById(R.id.thubox);
CheckBox check5 = (CheckBox)this.findViewById(R.id.fribox);
CheckBox check6 = (CheckBox)this.findViewById(R.id.satbox);
CheckBox check7 = (CheckBox)this.findViewById(R.id.sunbox);
CheckBox vibratebox = (CheckBox)this.findViewById(R.id.vibratecheckbox);
//get times
TimePicker startpicker = (TimePicker)this.findViewById(R.id.starttimepicker);
TimePicker stoppicker = (TimePicker)this.findViewById(R.id.stoptimepicker);
//check for input errors
if(titletext.getText().toString().length() == 0) //if title is empty
{
redo = true;
toast = Toast.makeText(view.getContext(), "Enter an event name", 4);
toast.show();
//some sick-ass shake animations!!!
Animation shake = AnimationUtils.loadAnimation(titletext.getContext(), R.anim.shake_big);
this.findViewById(R.id.titletext).startAnimation(shake);
}
else if((!check1.isChecked()) && (!check2.isChecked()) && (!check3.isChecked()) &&
(!check4.isChecked()) && (!check5.isChecked()) && (!check6.isChecked()) &&
(!check7.isChecked())) //if all checkboxes arent checked
{
redo = true;
toast = Toast.makeText(view.getContext(), "At least one day of week must be checked", 4);
toast.show();
//more sick-ass shake animations!!!
Animation shake = AnimationUtils.loadAnimation(titletext.getContext(), R.anim.shake_small);
this.findViewById(R.id.checkboxes).startAnimation(shake);
this.findViewById(R.id.daysofweek).startAnimation(shake);
this.findViewById(R.id.frequencytext).startAnimation(shake);
}
if(!redo) //if all info is fine
{
//check to see if time goes into next day
if((startpicker.getCurrentHour() > stoppicker.getCurrentHour())||
((startpicker.getCurrentHour() == stoppicker.getCurrentHour())
&& (startpicker.getCurrentMinute() >= stoppicker.getCurrentMinute())))
{
toast = Toast.makeText(view.getContext(), "Note: Stop time is earlier than start time, so this schedule stops at next day", Toast.LENGTH_LONG);
toast.show();
}
toast = Toast.makeText(view.getContext(), "Schedule saved", Toast.LENGTH_LONG);
toast.show();
//changing old schedule to new one
boolean[] tempdays = {check1.isChecked(), check2.isChecked(), check3.isChecked(), check4.isChecked(),
check5.isChecked(), check6.isChecked(), check7.isChecked()};
Log.i("mydebug","Time info read from counters: Start hour: " + startpicker.getCurrentHour() + "\nStop hour: " + stoppicker.getCurrentHour());
tempmainfrag.mainObjectList.changeSchedule(mainPosition, titletext.getText().toString(), tempdays, vibratebox.isChecked(),
startpicker.getCurrentHour(), startpicker.getCurrentMinute(), stoppicker.getCurrentHour(), stoppicker.getCurrentMinute());
//used to hide keyboard in case its still open when displaying list
InputMethodManager imm = (InputMethodManager)this.getSystemService(
Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(titletext.getWindowToken(), 0);
this.onBackPressed(); //replicates backpress to go back to list
}
}
else //if new schedule needs to be created
{
Log.i("mydebug","Creating new schedule...");
boolean redo = false;
//create toast
Toast toast;
//get title
EditText titletext = (EditText)this.findViewById(R.id.titletext);
//get checkboxes
CheckBox check1 = (CheckBox)this.findViewById(R.id.monbox); //recreate checkboxes from view in activity (doesnt extend Activity
CheckBox check2 = (CheckBox)this.findViewById(R.id.tuebox); //so use getActivity())
CheckBox check3 = (CheckBox)this.findViewById(R.id.wedbox);
CheckBox check4 = (CheckBox)this.findViewById(R.id.thubox);
CheckBox check5 = (CheckBox)this.findViewById(R.id.fribox);
CheckBox check6 = (CheckBox)this.findViewById(R.id.satbox);
CheckBox check7 = (CheckBox)this.findViewById(R.id.sunbox);
CheckBox vibratebox = (CheckBox)this.findViewById(R.id.vibratecheckbox);
//get times
TimePicker startpicker = (TimePicker)this.findViewById(R.id.starttimepicker);
TimePicker stoppicker = (TimePicker)this.findViewById(R.id.stoptimepicker);
EditText temppp = titletext;
//check for input errors
if(titletext.getText().toString().length() == 0) //if title is empty
{
redo = true;
toast = Toast.makeText(view.getContext(), "Enter an event name", 4);
toast.show();
//some sick-ass shake animations!!!
Animation shake = AnimationUtils.loadAnimation(titletext.getContext(), R.anim.shake_big);
this.findViewById(R.id.titletext).startAnimation(shake);
}
else if((!check1.isChecked()) && (!check2.isChecked()) && (!check3.isChecked()) &&
(!check4.isChecked()) && (!check5.isChecked()) && (!check6.isChecked()) &&
(!check7.isChecked())) //if all checkboxes arent checked
{
redo = true;
toast = Toast.makeText(view.getContext(), "At least one day of week must be checked", 4);
toast.show();
//more sick-ass shake animations!!!
Animation shake = AnimationUtils.loadAnimation(titletext.getContext(), R.anim.shake_small);
this.findViewById(R.id.checkboxes).startAnimation(shake);
this.findViewById(R.id.daysofweek).startAnimation(shake);
this.findViewById(R.id.frequencytext).startAnimation(shake);
}
if(!redo) //if all info is fine
{
//check to see if time goes into next day
if((startpicker.getCurrentHour() > stoppicker.getCurrentHour())||
((startpicker.getCurrentHour() == stoppicker.getCurrentHour())
&& (startpicker.getCurrentMinute() >= stoppicker.getCurrentMinute())))
{
toast = Toast.makeText(view.getContext(), "Note: Stop time is earlier than start time, so this schedule stops at next day", Toast.LENGTH_LONG);
toast.show();
}
toast = Toast.makeText(view.getContext(), "Schedule created", Toast.LENGTH_LONG);
toast.show();
//changing old schedule to new one
boolean[] tempdays = {check1.isChecked(), check2.isChecked(), check3.isChecked(), check4.isChecked(),
check5.isChecked(), check6.isChecked(), check7.isChecked()};
Log.i("mydebug","Time info read from counters: Start hour: " + startpicker.getCurrentHour() + "\nStop hour: " + stoppicker.getCurrentHour());
tempmainfrag.mainObjectList.addSchedule(titletext.getText().toString(), tempdays, vibratebox.isChecked(),
startpicker.getCurrentHour(), startpicker.getCurrentMinute(), stoppicker.getCurrentHour(), stoppicker.getCurrentMinute());
//used to hide keyboard in case its still open when displaying list
InputMethodManager imm = (InputMethodManager)this.getSystemService(
Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(titletext.getWindowToken(), 0);
this.onBackPressed(); //replicates backpress to go back to list
}
}
}
public void deleteButtonClicked(View view)
{
//tempmainfrag = (MainListFragment)getSupportFragmentManager().
//findFragmentById(R.id.fragment_container);
if(!infofrag.newsched) //if existing schedule, so ask to delete
{
//make a notification
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Delete?");
builder.setIcon(R.drawable.trash_icon);
builder.setMessage("Are you sure you wish to delete this schedule?")
.setCancelable(false)
.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
tempmainfrag.mainObjectList.removeSchedule(mainPosition);
Toast toast;
toast = Toast.makeText(tempmainfrag.getActivity(), "Schedule deleted", 4);
toast.show();
tempmainfrag.exit();
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.dismiss();
}
});
AlertDialog alert = builder.create();
alert.show();
}
else //if new schedule, so just cancel
tempmainfrag.exit();
}
public void hideKeyboard() //hides keyboard, called whenever reverting back to list
{
InputMethodManager imm = (InputMethodManager)getSystemService(
Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(this.getCurrentFocus().getWindowToken(), 0);
}
}
public class InfoFragment extends Fragment {
//strings used to get info from MainListFragment
public String ARG_POSITION = "position";
public String ARG_NAME = "name";
public String ARG_DAYS = "days";
public String ARG_TIMES = "times";
public String ARG_VIBRATE = "vibrate";
public String ARG_AMPM = "ampm";
public String ARG_NEW = "new";
boolean newsched = false;
int mCurrentPosition = -1;
MenuItem menuItemAddInfo;
public InfoFragment(MenuItem add)
{
menuItemAddInfo = add;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// If activity recreated (such as from screen rotate), restore
// the previous article selection set by onSaveInstanceState().
// This is primarily necessary when in the two-pane layout.
if (savedInstanceState != null) {
mCurrentPosition = savedInstanceState.getInt(ARG_POSITION);
}
// Inflate the layout for this fragment
return inflater.inflate(R.layout.infolayout, container, false);
}
@Override
public void onStart() {
super.onStart();
menuItemAddInfo.setVisible(false);
// During startup, check if there are arguments passed to the fragment.
// onStart is a good place to do this because the layout has already been
// applied to the fragment at this point so we can safely call the method
// below that sets the article text.
Bundle args = getArguments();
if (!args.getBoolean(ARG_NEW)) //if creating fragment with existing info i.e. not new schedule
{
newsched = false;
Log.i("mydebug", "TYPE: Existing schedule");
// if a list item is clicked and arguments are fed in
updateInfoView(args.getInt(ARG_POSITION), args.getString(ARG_NAME), args.getStringArray(ARG_AMPM), args.getBooleanArray(ARG_DAYS),
args.getIntArray(ARG_TIMES), args.getBoolean(ARG_VIBRATE));
}
else
{
Log.i("mydebug", "TYPE: New schedule");
Button changesave = (Button)getActivity().findViewById(R.id.savebutton);
changesave.setText("Create");
Button changedelete = (Button)getActivity().findViewById(R.id.cancelbutton);
changedelete.setText("Cancel");
newsched = true;
//set defaults
TimePicker startpicker = (TimePicker)getActivity().findViewById(R.id.starttimepicker);
TimePicker stoppicker = (TimePicker)getActivity().findViewById(R.id.stoptimepicker);
startpicker.setCurrentHour(8);
startpicker.setCurrentMinute(0);
stoppicker.setCurrentHour(15);
stoppicker.setCurrentMinute(0);
CheckBox vibratebox = (CheckBox)getActivity().findViewById(R.id.vibratecheckbox);
vibratebox.setChecked(true);
}
//set up custom font
Typeface customfont = Typeface.createFromAsset(getActivity().getAssets(), "fonts/Roboto-Light.ttf");
TextView frequency = (TextView)getActivity().findViewById(R.id.frequencytext);
TextView start = (TextView)getActivity().findViewById(R.id.starttext);
TextView stop = (TextView)getActivity().findViewById(R.id.stoptext);
CheckBox vibratebox = (CheckBox)getActivity().findViewById(R.id.vibratecheckbox);
TextView mon = (TextView)getActivity().findViewById(R.id.montext);
TextView tue = (TextView)getActivity().findViewById(R.id.tuetext);
TextView wed = (TextView)getActivity().findViewById(R.id.wedtext);
TextView thu = (TextView)getActivity().findViewById(R.id.thutext);
TextView fri = (TextView)getActivity().findViewById(R.id.fritext);
TextView sat = (TextView)getActivity().findViewById(R.id.sattext);
TextView sun = (TextView)getActivity().findViewById(R.id.suntext);
EditText title = (EditText)getActivity().findViewById(R.id.titletext);
frequency.setTypeface(customfont);
start.setTypeface(customfont);
stop.setTypeface(customfont);
vibratebox.setTypeface(customfont);
mon.setTypeface(customfont);
tue.setTypeface(customfont);
wed.setTypeface(customfont);
thu.setTypeface(customfont);
fri.setTypeface(customfont);
sat.setTypeface(customfont);
sun.setTypeface(customfont);
title.setTypeface(customfont);
}
@Override
public void onStop()
{
if(menuItemAddInfo != null)
menuItemAddInfo.setVisible(true); //turns on menu item 'add'
super.onStop();
}
public void updateInfoView(int position, String schedulename, String[] ampm, boolean[] days, int[] times, boolean vibrate) { //previously used to set which article
mCurrentPosition = position;
//debugging info
String debugdays = String.valueOf(days[0]) + ", " + String.valueOf(days[1]) + ", " + String.valueOf(days[2]) + ", " +
String.valueOf(days[3]) + ", " + String.valueOf(days[4]) + ", " + String.valueOf(days[5]) + ", " + String.valueOf(days[6]);
String debug = "LISTITEMCLICKED:\nPosition:" + position + "\nName:" + schedulename + "\nStart AM/PM:" + ampm[0] + "\nStop AM/PM:" + ampm[1]
+ "\nDays:" + debugdays + "\nStart time: " + times[0] + ":" + times[1] + "\nStop time: " + times[2] + ":" + times[3] + "\nVibrate: " + vibrate;
Log.i("mydebug",debug);
//set title
EditText titletext = (EditText)getActivity().findViewById(R.id.titletext);
titletext.setText(schedulename);
titletext.setSelection(titletext.getText().length()); //just sets cursor at end to fulfill my OCD
//set days
CheckBox check1 = (CheckBox)getActivity().findViewById(R.id.monbox); //recreate checkboxes from view in activity (doesnt extend Activity
CheckBox check2 = (CheckBox)getActivity().findViewById(R.id.tuebox); //so use getActivity())
CheckBox check3 = (CheckBox)getActivity().findViewById(R.id.wedbox);
CheckBox check4 = (CheckBox)getActivity().findViewById(R.id.thubox);
CheckBox check5 = (CheckBox)getActivity().findViewById(R.id.fribox);
CheckBox check6 = (CheckBox)getActivity().findViewById(R.id.satbox);
CheckBox check7 = (CheckBox)getActivity().findViewById(R.id.sunbox);
CheckBox vibratebox = (CheckBox)getActivity().findViewById(R.id.vibratecheckbox);
if (days[0])
check1.setChecked(true); //enable checkboxes to correct bool value
if (days[1])
check2.setChecked(true);
if (days[2])
check3.setChecked(true);
if (days[3])
check4.setChecked(true);
if (days[4])
check5.setChecked(true);
if (days[5])
check6.setChecked(true);
if (days[6])
check7.setChecked(true);
if (vibrate)
vibratebox.setChecked(true);
//set times
TimePicker startpicker = (TimePicker)getActivity().findViewById(R.id.starttimepicker);
TimePicker stoppicker = (TimePicker)getActivity().findViewById(R.id.stoptimepicker);
startpicker.setCurrentHour(times[0]);
startpicker.setCurrentMinute(times[1]);
stoppicker.setCurrentHour(times[2]);
stoppicker.setCurrentMinute(times[3]);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// Save the current article selection in case we need to recreate the fragment
outState.putInt(ARG_POSITION, mCurrentPosition);
}
}
public class InfoFragment extends Fragment {
public InfoFragment()
{
// Do some stuff
}
public InfoFragment(MenuItem add)
{
menuItemAddInfo = add;
}
}
public class InfoFragment extends Fragment {
public InfoFragment()
{
// Do some stuff
}
public InfoFragment(MenuItem add)
{
menuItemAddInfo = add;
}
}
请注意操作-这可能会导致数据丢失/NPE，因为当系统重新生成片段时，add不会被重新传递。@a-C我同意你的看法。当system.MenuItems调用的onSaveInstanceState未序列化时，setRetainInstance可能会帮助和/或保存数据。我将尝试在片段中创建一个接口，由主活动实现。这样，片段可以在需要时从“活动”请求菜单项。只需给OP一个注释-这可能会导致数据丢失/NPE，因为当系统重新生成片段时，“添加”将不会被重新传递。@a-C我同意你的看法。当system.MenuItems调用的onSaveInstanceState未序列化时，setRetainInstance可能会帮助和/或保存数据。我将尝试在片段中创建一个接口，由主活动实现。这样，片段可以在需要时从活动请求MenuItem。