timepicker扩展FragmentActivity Date picker here FragmentActivity
time picker fragment activity执行相同的操作
timepicker启用et1＆amp; et2 BuffetOfferings_MainFragmentActivity.java
public class BuffetOfferings_MainFragmentActivity extends FragmentActivity{
static final int TIME_DIALOG_ID = 1111;
private int hour;
private int minute;
Button back_button;
EditText et1;
EditText et2;
FragmentManager manager;
FragmentTransaction transaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.buffet_offerings_fragment_main_reference);
et1=(EditText) findViewById(R.id.from_lunch_edit_text_id);
et2=(EditText) findViewById(R.id.to_lunch_edit_text_id);
Buffet_offerings_breakfast_menu1 breakfast_fragment=new Buffet_offerings_breakfast_menu1();
manager=getSupportFragmentManager();
transaction=manager.beginTransaction();
transaction.add(R.id.BREAKFAST_LAYOUT_ID,breakfast_fragment, "breakfast_menu1_fragment");
transaction.commit();
/********* display current time on screen Start ********/
final Calendar c = Calendar.getInstance();
// Current Hour
hour = c.get(Calendar.HOUR_OF_DAY);
// Current Minute
minute = c.get(Calendar.MINUTE);
// set current time into output textview
updateTime(hour, minute);
/********* display current time on screen End ********/
// Add Button Click Listener
addButtonClickListener();
}
public void addButtonClickListener() {
et1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
showDialog(TIME_DIALOG_ID);
}
});
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case TIME_DIALOG_ID:
// set time picker as current time
return new TimePickerDialog(this, timePickerListener, hour, minute,
false);
}
return null;
}
private TimePickerDialog.OnTimeSetListener timePickerListener = new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minutes) {
// TODO Auto-generated method stub
hour = hourOfDay;
minute = minutes;
updateTime(hour,minute);
}
};
private static String utilTime(int value) {
if (value < 10)
return "0" + String.valueOf(value);
else
return String.valueOf(value);
}
// Used to convert 24hr format to 12hr format with AM/PM values
private void updateTime(int hours, int mins) {
String timeSet = "";
if (hours > 12) {
hours -= 12;
timeSet = "PM";
} else if (hours == 0) {
hours += 12;
timeSet = "AM";
} else if (hours == 12)
timeSet = "PM";
else
timeSet = "AM";
String minutes = "";
if (mins < 10)
minutes = "0" + mins;
else
minutes = String.valueOf(mins);
// Append in a StringBuilder
String aTime = new StringBuilder().append(hours).append(':')
.append(minutes).append(" ").append(timeSet).toString();
et1.setText(aTime);
}
public void BreakfastRedMenu1(View V){
Buffet_offerings_breakfast_menu2 breakfast_fragment1=new Buffet_offerings_breakfast_menu2();
transaction=manager.beginTransaction();
transaction.replace(R.id.BREAKFAST_LAYOUT_ID, breakfast_fragment1, "Tag1");
transaction.commit();
}
public void BreakfastGreenMenu2(View V){
Buffet_offerings_breakfast_menu1 breakfast_fragment2=new Buffet_offerings_breakfast_menu1();
transaction=manager.beginTransaction();
transaction.replace(R.id.BREAKFAST_LAYOUT_ID, breakfast_fragment2, "Tag4");
transaction.commit();
}
}
当我从之前的活动导航到我的datepicker存在的当前活动时，记录:: ....我得到以下日志
12-26 16:53:52.689: E/AndroidRuntime(1289): FATAL EXCEPTION: main
12-26 16:53:52.689: E/AndroidRuntime(1289): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidbegin.jsonparsetutorial/com.project.findmybuffet.BuffetOfferings_MainFragmentActivity}: java.lang.NullPointerException
12-26 16:53:52.689: E/AndroidRuntime(1289): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
12-26 16:53:52.689: E/AndroidRuntime(1289): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
12-26 16:53:52.689: E/AndroidRuntime(1289): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
12-26 16:53:52.689: E/AndroidRuntime(1289): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
12-26 16:53:52.689: E/AndroidRuntime(1289): at android.os.Handler.dispatchMessage(Handler.java:99)
12-26 16:53:52.689: E/AndroidRuntime(1289): at android.os.Looper.loop(Looper.java:123)
12-26 16:53:52.689: E/AndroidRuntime(1289): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-26 16:53:52.689: E/AndroidRuntime(1289): at java.lang.reflect.Method.invokeNative(Native Method)
12-26 16:53:52.689: E/AndroidRuntime(1289): at java.lang.reflect.Method.invoke(Method.java:521)
12-26 16:53:52.689: E/AndroidRuntime(1289): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-26 16:53:52.689: E/AndroidRuntime(1289): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-26 16:53:52.689: E/AndroidRuntime(1289): at dalvik.system.NativeStart.main(Native Method)
12-26 16:53:52.689: E/AndroidRuntime(1289): Caused by: java.lang.NullPointerException
12-26 16:53:52.689: E/AndroidRuntime(1289): at com.project.findmybuffet.BuffetOfferings_MainFragmentActivity.updateTime(BuffetOfferings_MainFragmentActivity.java:158)
12-26 16:53:52.689: E/AndroidRuntime(1289): at com.project.findmybuffet.BuffetOfferings_MainFragmentActivity.onCreate(BuffetOfferings_MainFragmentActivity.java:67)
12-26 16:53:52.689: E/AndroidRuntime(1289): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-26 16:53:52.689: E/AndroidRuntime(1289): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
12-26 16:53:52.689: E/AndroidRuntime(1289): ... 11 more
BuffetOfferings_MainFragmentActivity.java
public class BuffetOfferings_MainFragmentActivity extends FragmentActivity{
Button back_button;
FragmentManager manager;
FragmentTransaction transaction;
EditText ed1,ed2;
boolean flag =false;
TimePickerFragment newFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.buffet_offerings_fragment_main_reference);
ed1 = (EditText) findViewById(R.id.from_lunch_edit_text_id);
ed2 = (EditText) findViewById(R.id.to_lunch_edit_text_id);
Buffet_offerings_breakfast_menu1 breakfast_fragment=new Buffet_offerings_breakfast_menu1();
Buffet_offerings_lunch_menu1 lunch_fragment=new Buffet_offerings_lunch_menu1();
Buffet_offerings_dinner_menu1 dinner_fragment=new Buffet_offerings_dinner_menu1();
manager=getSupportFragmentManager();
transaction=manager.beginTransaction();
transaction.add(R.id.BREAKFAST_LAYOUT_ID,breakfast_fragment, "breakfast_menu1_fragment");
transaction.add(R.id.LUNCH_LAYOUT_ID,lunch_fragment, "lunch_menu1_fragment");
transaction.add(R.id.DINNER_LAYOUT_ID,dinner_fragment, "dinner_menu1_fragment");
transaction.commit();
newFragment = new TimePickerFragment();
ed1.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
flag=false;
newFragment.show(getSupportFragmentManager(), "timePicker");
}
});
ed2.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
flag=true;
newFragment.show(getSupportFragmentManager(), "timePicker");
}
});
back_button=(Button) findViewById(R.id.TopNavigationBarRestaurantBuffetOfferingsBackButton);
back_button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
}
public void returnTime(String value) {
// TODO Auto-generated method stub
if(flag==false)
ed1.setText(value);
else if(flag==true)
ed2.setText(value);
}
public void BreakfastRedMenu1(View V){
Buffet_offerings_breakfast_menu2 breakfast_fragment1=new Buffet_offerings_breakfast_menu2();
transaction=manager.beginTransaction();
transaction.replace(R.id.BREAKFAST_LAYOUT_ID, breakfast_fragment1, "Tag1");
transaction.commit();
}
public void LunchRedMenu1(View V){
Buffet_offerings_lunch_menu2 lunch_fragment1=new Buffet_offerings_lunch_menu2();
transaction=manager.beginTransaction();
transaction.replace(R.id.LUNCH_LAYOUT_ID, lunch_fragment1, "Tag2");
transaction.commit();
}
public void DinnerRedMenu1(View V){
Buffet_offerings_dinner_menu2 dinner_fragment1=new Buffet_offerings_dinner_menu2();
transaction=manager.beginTransaction();
transaction.replace(R.id.DINNER_LAYOUT_ID, dinner_fragment1, "Tag3");
transaction.commit();
}
public void BreakfastGreenMenu2(View V){
Buffet_offerings_breakfast_menu1 breakfast_fragment2=new Buffet_offerings_breakfast_menu1();
transaction=manager.beginTransaction();
transaction.replace(R.id.BREAKFAST_LAYOUT_ID, breakfast_fragment2, "Tag4");
transaction.commit();
}
public void LunchGreenMenu2(View V){
Buffet_offerings_lunch_menu1 lunch_fragment2=new Buffet_offerings_lunch_menu1();
transaction=manager.beginTransaction();
transaction.replace(R.id.LUNCH_LAYOUT_ID, lunch_fragment2, "Tag5");
transaction.commit();
}
public void DinnerGreenMenu2(View V){
Buffet_offerings_dinner_menu1 dinner_fragment2=new Buffet_offerings_dinner_menu1();
transaction=manager.beginTransaction();
transaction.replace(R.id.DINNER_LAYOUT_ID, dinner_fragment2, "Tag6");
transaction.commit();
}
}
TimePickerFragment.java
public class TimePickerFragment extends DialogFragment
implements TimePickerDialog.OnTimeSetListener {
public interface PickTime
{
public void returnTime(String value);
}
PickTime mCallback;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current time as the default values for the picker
mCallback = (PickTime) getActivity();
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
// Create a new instance of TimePickerDialog and return it
return new TimePickerDialog(getActivity(), this, hour, minute,
DateFormat.is24HourFormat(getActivity()));
}
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
// Do something with the time chosen by the user
if(mCallback!=null)
{
StringBuilder sb = new StringBuilder();
sb.append(hourOfDay);
sb.append(":");
sb.append(minute);
mCallback.returnTime(sb.toString());
}
}
}
LOG ::
12-26 17:18:09.800: E/AndroidRuntime(1376): FATAL EXCEPTION: main
12-26 17:18:09.800: E/AndroidRuntime(1376): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidbegin.jsonparsetutorial/com.project.findmybuffet.BuffetOfferings_MainFragmentActivity}: java.lang.NullPointerException
12-26 17:18:09.800: E/AndroidRuntime(1376): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
12-26 17:18:09.800: E/AndroidRuntime(1376): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
12-26 17:18:09.800: E/AndroidRuntime(1376): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
12-26 17:18:09.800: E/AndroidRuntime(1376): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
12-26 17:18:09.800: E/AndroidRuntime(1376): at android.os.Handler.dispatchMessage(Handler.java:99)
12-26 17:18:09.800: E/AndroidRuntime(1376): at android.os.Looper.loop(Looper.java:123)
12-26 17:18:09.800: E/AndroidRuntime(1376): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-26 17:18:09.800: E/AndroidRuntime(1376): at java.lang.reflect.Method.invokeNative(Native Method)
12-26 17:18:09.800: E/AndroidRuntime(1376): at java.lang.reflect.Method.invoke(Method.java:521)
12-26 17:18:09.800: E/AndroidRuntime(1376): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-26 17:18:09.800: E/AndroidRuntime(1376): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-26 17:18:09.800: E/AndroidRuntime(1376): at dalvik.system.NativeStart.main(Native Method)
12-26 17:18:09.800: E/AndroidRuntime(1376): Caused by: java.lang.NullPointerException
12-26 17:18:09.800: E/AndroidRuntime(1376): at com.project.findmybuffet.BuffetOfferings_MainFragmentActivity.onCreate(BuffetOfferings_MainFragmentActivity.java:53)
12-26 17:18:09.800: E/AndroidRuntime(1376): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-26 17:18:09.800: E/AndroidRuntime(1376): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
12-26 17:18:09.800: E/AndroidRuntime(1376): ... 11 more
答案 0 :(得分：1)
使用DailogFragment。
我使用了一个接口作为活动的回调，并将文本设置为edittext
参考：
http://developer.android.com/guide/topics/ui/controls/pickers.html
TimerPickerFragment
public class TimePickerFragment extends DialogFragment
implements TimePickerDialog.OnTimeSetListener {
public interface PickTime
{
public void returnTime(String value);
}
PickTime mCallback;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current time as the default values for the picker
mCallback = (PickTime) getActivity();
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
// Create a new instance of TimePickerDialog and return it
return new TimePickerDialog(getActivity(), this, hour, minute,
DateFormat.is24HourFormat(getActivity()));
}
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
// Do something with the time chosen by the user
if(mCallback!=null)
{
StringBuilder sb = new StringBuilder();
sb.append(hourOfDay);
sb.append(":");
sb.append(minute);
mCallback.returnTime(sb.toString());
}
}
}
MainActivity.java
public class MainActivity extends FragmentActivity implements PickTime{
EditText ed1,ed2;
boolean flag =false;
TimePickerFragment newFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ed1 = (EditText) findViewById(R.id.editText1);
ed2 = (EditText) findViewById(R.id.editText2);
newFragment = new TimePickerFragment();
ed1.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus){
flag =false;
newFragment.show(getSupportFragmentManager(), "timePicker");
}
}
});
ed2.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus){
flag =true;
newFragment.show(getSupportFragmentManager(), "timePicker");
}
}
});
}
@Override
public void returnTime(String value) {
// TODO Auto-generated method stub
if(flag==false)
ed1.setText(value);
else if(flag==true)
ed2.setText(value);
}
}