Android、timePicker和他在未被调用时的价值

Question

我的时间选择器工作得很好，但只有一种情况下它会产生错误的输出。如果我调用edit函数，并且所有变量都是从数据库中填充的，并且我不调用时间选择器（用这个函数点击按钮），它会用实际的系统值重写我的db值。我该怎么修？在我用picker点击按钮后，他们会显示我的数据库值，startactivity的textview显示数据库值，但在保存后，只有当我点击picker按钮（调用他）时，它才会保存数据库值。。。我如何设置值，然后我必须点击它，并且值保持在数据库中

public class PredmetPridajActivity extends Activity implements OnItemSelectedListener
{
//DateFormat fmtTime = DateFormat.getTimeInstance();
SimpleDateFormat fmtTime = new SimpleDateFormat("kk:mm");
SimpleDateFormat fmtDate2 = new SimpleDateFormat("yyyy-MM-dd kk:mm"); // upravit na den alebo v selecte lepsi order
TextView timeLabel;
Calendar time = Calendar.getInstance ();
public static final String ODOSLI = "odosli";
private DatabaseOp mDbHelper;
String username;
String odosli = "";
String predmet;
String obsah;
String poloha;
String vyucujuci;
String hodina;
String den;
int item;
String strItem;
EditText tv_nazov;
EditText tv_poznamka;
EditText tv_miesto;
EditText tv_vyucujuci;
private Spinner spinner;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.predmet_pridaj);
    this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
    spinner = (Spinner)findViewById(R.id.spinner_dni);
    ArrayAdapter<?> adapter = ArrayAdapter.createFromResource(this, R.array.dni, android.R.layout.simple_spinner_dropdown_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(this);
    mDbHelper = new DatabaseOp(this);
    mDbHelper.open();
    timeLabel = (TextView)findViewById(R.id.time);
    updateLabel();
    SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
    username = sharedPrefs.getString("prefUsername", "NULL");
    Intent i = getIntent();
    if (i.hasExtra(ODOSLI))
        odosli = i.getStringExtra(ODOSLI);
    if (odosli.length()>0)
    {
        dbOperations();
        tv_nazov = (EditText)findViewById(R.id.predmet);
        tv_nazov.setText(predmet);
        tv_poznamka = (EditText)findViewById(R.id.obsah);
        tv_poznamka.setText(obsah);
        tv_miesto = (EditText)findViewById(R.id.miesto);
        tv_miesto.setText(poloha);
        tv_vyucujuci = (EditText)findViewById(R.id.vyucujuci);
        tv_vyucujuci.setText(vyucujuci);
        timeLabel.setText(hodina);
        spinner.setSelection(Integer.parseInt(den));
    }
}
public void onItemSelected (AdapterView<?> parent, View view, int position, long id)
{
    strItem = parent.getItemAtPosition (position).toString();
    item = parent.getSelectedItemPosition();
}
public void onNothingSelected (AdapterView <?> parent)
{
}
protected void onPause(Bundle savedInstanceState)
{
    mDbHelper.close();
}
public void buttonClicked_uloz(View button) 
{
    getData();
    if (predmet.length()<1)
    {
        Toast.makeText(this, R.string.invalid_nazov, Toast.LENGTH_SHORT).show();
    } else {
        if (odosli.length()>0)
        {
            mDbHelper.updatePredmet(odosli, predmet, poloha, vyucujuci, hodina, obsah, item);
        } else {
            mDbHelper.createPredmet(username, predmet, obsah, poloha, vyucujuci, hodina, 1, item);
        }
        startActivity ();
    }
}
public void dbOperations ()
{
    mDbHelper = new DatabaseOp(this);
    mDbHelper.open();
    Cursor cursor = mDbHelper.fetchPredmet(odosli, 1);
    startManagingCursor(cursor);
    predmet = cursor.getString(cursor.getColumnIndexOrThrow(DatabaseOp.KEY_NAZOV));
    obsah = cursor.getString(cursor.getColumnIndexOrThrow(DatabaseOp.KEY_POZNAMKA));
    poloha = cursor.getString(cursor.getColumnIndexOrThrow(DatabaseOp.KEY_POLOHA));
    vyucujuci = cursor.getString(cursor.getColumnIndexOrThrow(DatabaseOp.KEY_VYUCUJUCI));
    hodina = cursor.getString(cursor.getColumnIndexOrThrow(DatabaseOp.KEY_HODINA));
    den = cursor.getString(cursor.getColumnIndexOrThrow(DatabaseOp.KEY_DLZKA));
}
public void getData ()
{
    EditText predmetInput = ((EditText)findViewById(R.id.predmet));
    predmet = predmetInput.getText().toString();
    EditText obsahInput = ((EditText)findViewById(R.id.obsah));
    obsah = obsahInput.getText().toString();
    EditText polohaInput = ((EditText)findViewById(R.id.miesto));
    poloha = polohaInput.getText().toString();
    EditText vyucujuciInput = ((EditText)findViewById(R.id.vyucujuci));
    vyucujuci = vyucujuciInput.getText().toString();
    hodina = fmtTime.format(time.getTime());
}
public void chooseTime (View v)
{
    if (odosli.length()>0)
    {
        new TimePickerDialog (PredmetPridajActivity.this, t, Integer.parseInt(hodina.substring(0,2)), Integer.parseInt(hodina.substring(3,5)),true).show();
    } else {
        new TimePickerDialog (PredmetPridajActivity.this, t, time.get(Calendar.HOUR_OF_DAY),time.get(Calendar.MINUTE),true).show();
    }
}
public void updateLabel()
{
    timeLabel.setText(fmtTime.format(time.getTime()));
}
TimePickerDialog.OnTimeSetListener t = new TimePickerDialog.OnTimeSetListener()
{
    public void onTimeSet (TimePicker view, int hourOfDay, int minute)
    {                       
        time.set(Calendar.HOUR_OF_DAY, hourOfDay);
        time.set(Calendar.MINUTE, minute);
        updateLabel();
    }
};
public void startActivity ()
{
    PredmetPridajActivity.this.finish();
}
}

Answer 1

试试这个，但这个设置当前时间就像默认的

SimpleDateFormat sdf = new SimpleDateFormat("hh:ss");
        Date date = null;
        try {
            date = sdf.parse("07:00");
        } catch (ParseException e) {
        }
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        TimePicker picker = new TimePicker(getApplicationContext());
        picker.setCurrentHour(c.get(Calendar.HOUR_OF_DAY));//your default hour
        picker.setCurrentMinute(c.get(Calendar.MINUTE));// your default minute