我有一个自定义对话框，我正在尝试实现ViewPager。下面是logCat，DialogClass和布局。我尝试了很多不同的方法，所以我回到了我开始的原始代码。如何在对话框中实现ViewPager？我没有使用片段只是布局。我似乎无法解决这个问题。我已经看过其他问题了，这不是我想要的。
LogCat 第565行错误= 返回arg0 ==（（查看）arg1）;
09-06 16:50:45.050: W/dalvikvm(29278): threadid=1: thread exiting with uncaught exception (group=0x41b40da0)
09-06 16:50:45.050: E/AndroidRuntime(29278): FATAL EXCEPTION: main
09-06 16:50:45.050: E/AndroidRuntime(29278): Process: com.theworkoutcalculator, PID: 29278
09-06 16:50:45.050: E/AndroidRuntime(29278): java.lang.ClassCastException: com.theworkoutcalculator.Activities.CaloriesLogMainActivity cannot be cast to android.view.View
09-06 16:50:45.050: E/AndroidRuntime(29278): at com.theworkoutcalculator.UIElements.LogDialog$WizardPagerAdapter.isViewFromObject(LogDialog.java:565)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.support.v4.view.ViewPager.infoForChild(ViewPager.java:1333)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.support.v4.view.ViewPager.populate(ViewPager.java:1084)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.View.measure(View.java:17387)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1052)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.View.measure(View.java:17387)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.View.measure(View.java:17387)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.View.measure(View.java:17387)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.View.measure(View.java:17387)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.View.measure(View.java:17387)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.View.measure(View.java:17387)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-06 16:50:45.050: E/AndroidRuntime(29278): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2533)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.View.measure(View.java:17387)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2211)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1325)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1547)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1234)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6465)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:803)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.Choreographer.doCallbacks(Choreographer.java:603)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.Choreographer.doFrame(Choreographer.java:573)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:789)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.os.Handler.handleCallback(Handler.java:733)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.os.Handler.dispatchMessage(Handler.java:95)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.os.Looper.loop(Looper.java:157)
09-06 16:50:45.050: E/AndroidRuntime(29278): at android.app.ActivityThread.main(ActivityThread.java:5356)
09-06 16:50:45.050: E/AndroidRuntime(29278): at java.lang.reflect.Method.invokeNative(Native Method)
09-06 16:50:45.050: E/AndroidRuntime(29278): at java.lang.reflect.Method.invoke(Method.java:515)
09-06 16:50:45.050: E/AndroidRuntime(29278): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
09-06 16:50:45.050: E/AndroidRuntime(29278): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
09-06 16:50:45.050: E/AndroidRuntime(29278): at dalvik.system.NativeStart.main(Native Method)
DialogClass，取出大部分不相关的代码
public class LogDialog {
Context mContext;
LogDialogListener mListener;
Log mLog;
Date mDate;
/**
* @param context
* required to create and display the dialog
* @param listener
* the callback listener that will receive the newly created log
*/
public LogDialog(Context context, LogDialogListener listener) {
mContext = context;
mListener = listener;
mDate = new Date();
}
/**
* Interface that handles log creation, deletion, or log edit Notifies the
* activity class that the log has been modified
*/
public interface LogDialogListener {
/**
* passes the newly created log back to the activity
*
* @param log
*/
public abstract void logCreated(Log log);
public abstract void logEdited(Log log);
public abstract void logDeleted(Log log);
}
/**
* assigns mLog to log for methods
*
* @param log
*/
public void setLog(Log log) {
mLog = log;
}
/**
* Creates an alert dialog using a layout inflator then displays the alert
* dialog using mContext
*/
// Dialog Design etc.
public void show() {
/*
* Inflater in order to view the dialog
*/
LayoutInflater factory = LayoutInflater.from(mContext);
View view = factory.inflate(R.layout.journal_dialog_connector_main,
null);
AlertDialog.Builder builder = new AlertDialog.Builder((mContext));
WizardPagerAdapter adapter = new WizardPagerAdapter();
final ViewPager pager = (ViewPager) view.findViewById(R.id.pager);
pager.setAdapter(adapter);
}
class WizardPagerAdapter extends PagerAdapter {
public Object instantiateItem(View collection, int position) {
int resId = 0;
switch (position) {
case 0:
resId = R.id.layout1;
break;
case 1:
resId = R.id.layout2;
break;
case 2:
resId = R.id.layout3;
break;
}
return mContext;
}
@Override
public int getCount() {
return 3;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View) arg1);
}
}
}
布局
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/layout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<include
android:id="@+id/LinearLayout1"
layout="@layout/journal_dialog_page_one" />
</LinearLayout>
<LinearLayout
android:id="@+id/layout2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<include
android:id="@+id/LinearLayout2"
layout="@layout/journal_dialog_history_list" />
</LinearLayout>
<LinearLayout
android:id="@+id/layout3"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<include
android:id="@+id/LinearLayout3"
layout="@layout/scanner" />
</LinearLayout>
</android.support.v4.view.ViewPager>
</LinearLayout>
修改 ** CaloriesLogMainActivity **我在这里称之为Dialog。
public class CaloriesLogMainActivity extends Activity
implements
OnItemClickListener,
OnClickListener,
LogDialogListener,
OnDateSetListener,
{
private TextView currentDateTextView;
private TextView noLogsTextView;
private Date currentDate = new Date();
private ListView logsList;
private LogsArrayAdapter logsAdapter;
ViewPager pager;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.journal_main);
currentDateTextView = (TextView) findViewById(R.id.current_date);
currentDateTextView.setText(formatDate(currentDate));
// List View Day of the week
SimpleDateFormat sdf = new SimpleDateFormat("EEEE");
Date d = new Date();
String dayOfTheWeek = sdf.format(d);
TextView listDayOfWeek = (TextView) findViewById(R.id.tvDailyList);
listDayOfWeek.setText(dayOfTheWeek + "'s Logs");
}
/**
* Opens a new dialog where the user will be able to create a new log
*/
private void show_create_log_dialog() {
LogDialog dialog = new LogDialog(this, this);
dialog.setDate(currentDate);
dialog.show();
}
/**
* Opens a new dialog passing the log into the LogDialog. This is used for
* editing a single log
*
* @param log
*/
private void show_create_log_dialog(Log log) {
LogDialog dialog = new LogDialog(this, this);
dialog.setLog(log);
dialog.show();
}
/**
* Opens the a date picker dialog. Once the user picks a date, the log list
* will be updated with logs from that day
*/
private void show_datepicker_dialog() {
Calendar cal = Calendar.getInstance();
cal.setTime(currentDate);
int year = cal.get(Calendar.YEAR);
int month = cal.get(Calendar.MONTH);
int day = cal.get(Calendar.DAY_OF_MONTH);
DatePickerDialog dialog = new DatePickerDialog(this, this, year, month,
day);
dialog.getDatePicker().setCalendarViewShown(true);
/* Spinner View if you want to Show Set it to True */
dialog.getDatePicker().setSpinnersShown(true);
dialog.show();
}
/**
* Starts a new activity that displays all the logs saved by the user
*/
private void show_complete_log() {
Intent myIntent = new Intent(this, CompleteLogActivity.class);
this.startActivity(myIntent);
}
public void onClick(View v) {
int id = v.getId();
if (id == R.id.current_date) {
show_datepicker_dialog();
} else if (id == R.id.view_comp_log) {
show_complete_log();
}
}
/**
* formats a java.util.date object to a string for displaying to the user
*
* @param date
* @return String
*/
public static String formatDate(Date date) {
Context context = CalorieLogApplication.context();
String dateFormat = context.getResources().getString(
R.string.date_format);
return new SimpleDateFormat(dateFormat).format(date);
}
/**************************************************************************
*
* LogDialogListener Method Implementation
*
*************************************************************************/
/**
*
* Callback after a log is created from a LogDialogLIstener. Add the new log
* to the list and refresh the loglist
*
* @param [Log] log
*/
public void logCreated(Log log) {
if (areDatesEqual(log.getDate(), currentDate)) {
// logs.add(log);
logsAdapter.add(log);
updateList();
}
}
/**
*
* Callback after a log is edited from a LogDialogLIstener. Refreshes the
* log list
*
* @param [Log] log
*/
public void logEdited(Log log) {
updateList();
}
/**
*
* Callback after a log is Deleted from a LogDialogLIstener. Refreshes the
* log list
*
* @param [Log] log
*/
public void logDeleted(Log log) {
logsAdapter.remove(log);
updateList();
}
/**
* Compares Two date and returns whether the two dates are the same day
*
* @param [Date] a
* @param [Date] b
* @return
*/
private boolean areDatesEqual(Date a, Date b) {
Calendar cal1 = Calendar.getInstance();
Calendar cal2 = Calendar.getInstance();
cal1.setTime(a);
cal2.setTime(b);
return cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR)
&& cal1.get(Calendar.DAY_OF_YEAR) == cal2
.get(Calendar.DAY_OF_YEAR);
}
/**
* Refreshes the list of logs being displayed when the date is changed from
* the date picker dialog
*/
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
Calendar cal = Calendar.getInstance();
cal.set(year, monthOfYear, dayOfMonth);
currentDate = cal.getTime();
String date_string = formatDate(currentDate);
currentDateTextView.setText(date_string);
logsAdapter.setLogs(Log.logsByDate(currentDate));
updateList();
}
/**
* Calls the method to display the edit/create dialog box when a list item
* is clicked
*/
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
Log log = logsAdapter.getItem(arg2);
show_create_log_dialog(log);
}
}
答案 0 :(得分：1)
你应该替换：
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View) arg1);
}
有了这个：
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
并且您的第二个错误：
public Object instantiateItem(View collection, int position) {
int resId = 0;
switch (position) {
case 0:
resId = R.id.layout1;
break;
case 1:
resId = R.id.layout2;
break;
case 2:
resId = R.id.layout3;
break;
}
//Replace -> return mContext; with the code below
return collection.findViewById(resId);
}