我正在開發一個應用程序，在此我創建了timepicker，並且我希望將時間選擇器的選定時間縮短6小時（即06:00，如hh：mm）。以下是我使用的代碼。例如：如果用戶選擇12:30 pm，那麼它將不得不在文本視圖中顯示06:30 pm。我該怎麼做？如何從android中的timepicker選擇值獲取減少時間間隔？

//java file 
public class ProfileActivity4 extends AppCompatActivity implements View.OnClickListener{ 

    private TextView textView; 
    private EditText eddate, edtime; 
    private boolean loggedIn = false; 
    Button btn; 
    EditText edname,edaddress; 
    Button ptime, pdate; 

    TextView tvsname, tvsprice; 
    NumberPicker numberPicker; 
    TextView textview1,textview2; 
    Integer temp; 
    String pname, paddress, email, sname, sprice; 
    private int mYear, mMonth, mDay, mHour, mMinute; 
    private DrawerLayout drawerLayout; 
    private Toolbar toolbar; 

    Spinner spinnerPick; 
    TextView tdpicktime; 
    String picktime; 



    @Override 
    protected void onCreate(Bundle savedInstanceState){ 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_profile4); 

     toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setDisplayShowHomeEnabled(true); 

     toolbar.setNavigationOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       // back button pressed 

       Intent i = new Intent(ProfileActivity4.this, List_Activity1.class); 
       startActivity(i); 
      } 
     }); 

     // initNavigationDrawer(); 

     //Initializing textview 
     textView = (TextView) findViewById(R.id.textView); 
     edname=(EditText)findViewById(R.id.ed_pname); 
     edaddress=(EditText)findViewById(R.id.ed_add); 
     tvsname=(TextView)findViewById(R.id.textView_name); 
     tvsprice=(TextView)findViewById(R.id.textView2_price); 
     btn=(Button)findViewById(R.id.button); 

     spinnerPick=(Spinner)findViewById(R.id.spinner_picktime); 
     tdpicktime=(TextView)findViewById(R.id.textView_picktime); 

     // ArrayAdapter<String> sAdapter1 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, getResources().getStringArray(R.array.rides)); 
     ArrayAdapter<String> sAdapter1 = new ArrayAdapter<String>(this, R.layout.spinner_item, getResources().getStringArray(R.array.flighttype)); 
     spinnerPick.setAdapter(sAdapter1); 

     spinnerPick.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
      @Override 
      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
       picktime = spinnerPick.getSelectedItem().toString(); 

       } 

      @Override 
      public void onNothingSelected(AdapterView<?> parent) { 

      } 
     }); 


     eddate=(EditText)findViewById(R.id.editText_date); 
     edtime=(EditText)findViewById(R.id.editText_time); 

     ptime=(Button)findViewById(R.id.button_ptime); 
     pdate=(Button)findViewById(R.id.button_pdate); 

     ptime.setOnClickListener(this); 
     pdate.setOnClickListener(this); 

     Intent i = getIntent(); 
     // getting attached intent data 
     final String name = i.getStringExtra("company_name"); 
     // displaying selected product name 
     tvsname.setText(name); 

     String price = i.getStringExtra("sedan_price"); 
     // displaying selected product name 
     tvsprice.setText(price); 

     textview1 = (TextView)findViewById(R.id.textView1_amount); 
     // textview2 = (TextView)findViewById(R.id.textView_seats); 

     final int foo = Integer.parseInt(price); 
     textview1.setText(String.valueOf(foo)); 

     btn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       SharedPreferences sharedPreferences = getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE); 
       loggedIn = sharedPreferences.getBoolean(Config.LOGGEDIN_SHARED_PREF, false); 
       String email = sharedPreferences.getString(Config.EMAIL_SHARED_PREF, "Not Available"); 
       textView.setText(email); 

       if (loggedIn) { 

        submitForm(); 

        Intent intent = new Intent(ProfileActivity4.this, Confirm_Activity4.class); 
        intent.putExtra("company_name", name); 
        startActivity(intent); 
       } 
      } 
     }); 

    } 

    private void submitForm() { 

     String pname = edname.getText().toString(); 
     String paddress = edaddress.getText().toString(); 
     String sname = textview1.getText().toString(); 
     String time = edtime.getText().toString(); 
     String date = eddate.getText().toString(); 
     String email= textView.getText().toString(); 

     new SignupActivity3(this).execute(pname,paddress,sname,time,date,email); 

    } 

    @Override 
    public void onClick(View v) { 

     if (v == pdate) { 

      // Get Current Date 
      final Calendar c = Calendar.getInstance(); 
      mYear = c.get(Calendar.YEAR); 
      mMonth = c.get(Calendar.MONTH); 
      mDay = c.get(Calendar.DAY_OF_MONTH); 


      DatePickerDialog datePickerDialog = new DatePickerDialog(this, 
        new DatePickerDialog.OnDateSetListener() { 

         @Override 
         public void onDateSet(DatePicker view, int year, 
               int monthOfYear, int dayOfMonth) { 

          eddate.setText(dayOfMonth + "-" + (monthOfYear + 1) + "-" + year); 

         } 
        }, mYear, mMonth, mDay); 
      datePickerDialog.show(); 
     } 
     if (v == ptime) { 

      // Get Current Time 
      final Calendar c = Calendar.getInstance(); 
      mHour = c.get(Calendar.HOUR_OF_DAY); 
      mMinute = c.get(Calendar.MINUTE); 

      // Launch Time Picker Dialog 
      TimePickerDialog timePickerDialog = new TimePickerDialog(this, 
        new TimePickerDialog.OnTimeSetListener() { 

         @Override 
         public void onTimeSet(TimePicker view, int hourOfDay, 
               int minute) { 

         edtime.setText(hourOfDay + ":" + minute); 
         } 
        }, mHour, mMinute, false); 

      timePickerDialog.show(); 
     } 
     } 
}

來源

2016-08-30 rohiH

使用timepicker選定日期初始化新的日曆對象。

Calendar calendar = Calendar.getInstance(); // this would default to now 
    calendar.setTime(/*selected timepicker time*/); //or with epoch (long value like 1472554134000 with calendar.setTimeInMillis()) 
    calendar.add(Calendar.HOUR_OF_DAY, -6)

，如果你使用的是12小時制時鐘，然後用Calendar.HOUR其他Calendar.HOUR_OF_DAY

來源

2016-08-30 10:49:41

我正在使用24小時制時鐘 – rohiH

calendar.setTime（edtime）;在這一行，它顯示錯誤'calender不能應用於java.lang.string' – rohiH

你不能傳遞一個EditText對象，它需要一個Date對象，在** onTimeSet **中構造一個Date對象然後在這個對象上執行你的操作創建Date對象。 –

TL;博士

LocalTime.parse("12:30").minusHours(6).toString()

java.time

使用ThreeTenABP項目中的現代日期時間課程，的Android適應課程內置於Java 8及更高版本的java-time類的。

您的輸入和輸出恰好是標準的ISO 8601格式。這些標準格式默認在java.time類中用於解析/生成字符串。所以不需要指定格式化模式;直接解析。

LocalTime類表示沒有日期且沒有時區的時間。

LocalTime lt = LocalTime.parse("12:30"); 
LocalTime earlier = lt.minusHours(6); 
String output = earlier.toString();

來源

2016-08-30 15:21:11

如何從android中的timepicker選擇值獲取減少時間間隔？

回答

TL;博士

java.time

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