Question

我正在开一个巴士预订应用程序。

这是我的主页：

随时点击JournyDate布局将打开此页面：

基本上，我需要在JournyDate布局上设置选定的日期。

对于日历，我使用的是this library。

Home Fragment

datelayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getContext(), DateChooser.class);
            startActivityForResult(intent, 11);
        }
    });

 @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK && requestCode == 11) {
        Date date = new Date(data.getExtras().getString("Date"));
        txtDate.setText((CharSequence) date);
    }
}

DateChooser活动

public class DateChooser extends AppCompatActivity {

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

    MaterialCalendarView calendarView = (MaterialCalendarView) findViewById(R.id.calendarView);

    CalendarDay calendarDay = calendarView.getCurrentDate();
    calendarView.setCurrentDate(calendarDay);
    Date date = calendarDay.getDate();

    calendarView.setOnDateChangedListener(new OnDateSelectedListener() {
        @Override
        public void onDateSelected(@NonNull MaterialCalendarView widget, @NonNull CalendarDay date, boolean selected) {
            Intent result = new Intent();
            result.putExtra("Date", date);
            setResult(RESULT_OK, result);
            finish();
        }
    });
}
}

错误

E/AndroidRuntime: FATAL EXCEPTION: main
              Process: com.smiles.bus, PID: 19691
              java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=65547, result=-1, data=Intent { (has extras) }} to activity {com.smiles.bus/com.smiles.bus.MainActivity}: java.lang.IllegalArgumentException: The string argument is null
                  at android.app.ActivityThread.deliverResults(ActivityThread.java:4998)
                  at android.app.ActivityThread.handleSendResult(ActivityThread.java:5041)
                  at android.app.ActivityThread.access$1600(ActivityThread.java:229)
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1875)
                  at android.os.Handler.dispatchMessage(Handler.java:102)
                  at android.os.Looper.loop(Looper.java:148)
                  at android.app.ActivityThread.main(ActivityThread.java:7325)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
               Caused by: java.lang.IllegalArgumentException: The string argument is null
                  at java.util.Date.parse(Date.java:384)
                  at java.util.Date.<init>(Date.java:157)
                  at com.smiles.bus.Home.onActivityResult(Home.java:129)
                  at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:156)
                  at android.app.Activity.dispatchActivityResult(Activity.java:7165)
                  at android.app.ActivityThread.deliverResults(ActivityThread.java:4994)
                  at android.app.ActivityThread.handleSendResult(ActivityThread.java:5041) 
                  at android.app.ActivityThread.access$1600(ActivityThread.java:229) 
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1875) 
                  at android.os.Handler.dispatchMessage(Handler.java:102) 
                  at android.os.Looper.loop(Looper.java:148) 
                  at android.app.ActivityThread.main(ActivityThread.java:7325) 
                  at java.lang.reflect.Method.invoke(Native Method) 
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Answer 1

如果您希望将DateChooser作为活动启动，请使用以下命令启动它：

Intent intent = new Intent(this, DateChooser.class);
startActivityForResult(intent, REQUEST_DATE);

并对结果实施反应：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  if (resultCode == RESULT_OK && requestCode == REQUEST_DATE) {
     Date date = new Date(data.getExtras().getString(EXTRA_DATE));
     ...
  }
}

将结果返回DateChooser，如下所示：

Intent result = new Intent();
result.putExtra(EXTRA_DATE, date);
setResult(RESULT_OK, result);
finish();

将EXTRA_DATE定义为字符串常量，将REQUEST_DATE定义为int constant。

我没有测试过日期值的正确转换。应该只是一个灵感。

Answer 2

使用它。我们可以将数据传递到任何地方而无需使用intent和ActivityResult

otto

示例sample project

Answer 3

当您选择任何日期时将该日期转换为String变量，如下面的代码..

像这样转换日期对象字符串..

String selectedDate=date.toString();

       Intent result = new Intent(currentclassName.this,NextActivity.class);// if you finish then no need to define parameters into intent.
        result.putExtra("Date", selectedDate);
        setResult(RESULT_OK, result);
        finish();

如果传入片段，则使用参数传递数据。

Answer 4

使用public class Easy extends javax.swing.JFrame { /** * @param args * the command line arguments */ public static void main(final String args[]) { /* Set the Nimbus look and feel */ // <editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* * If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. For details see * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (final javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (final ClassNotFoundException ex) { java.util.logging.Logger.getLogger(Easy.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (final InstantiationException ex) { java.util.logging.Logger.getLogger(Easy.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (final IllegalAccessException ex) { java.util.logging.Logger.getLogger(Easy.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (final javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(Easy.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } // </editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(() -> new Easy().setVisible(true)); } NewTimer time; // Variables declaration - do not modify public javax.swing.JButton btnStart; public javax.swing.JPanel jPanel1; public javax.swing.JLabel lblTimerE; public javax.swing.JLabel lblWordE; // End of variables declaration /** * Creates new form Easy */ public Easy() { initComponents(); } private void btnStartActionPerformed(final java.awt.event.ActionEvent evt) { // TODO add your handling code here: time.startTimer(); } /** * This method is called from within the constructor to initialize the form. WARNING: Do NOT modify this code. The content of this method is always regenerated by the Form * Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jPanel1 = new javax.swing.JPanel(); lblTimerE = new javax.swing.JLabel(); btnStart = new javax.swing.JButton(); lblWordE = new javax.swing.JLabel(); time = new NewTimer(lblTimerE); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); // Rest of your code... }// </editor-fold> } public class NewTimer { JLabel lblTimerE; Timer timer = null; int counter = 5; int delay = 1500; public NewTimer(final JLabel lbl) { lblTimerE = lbl; } // method that will be called when the timer needs to start public void startTimer() { final ActionListener action = new ActionListener() { @Override public void actionPerformed(final ActionEvent event) { if (counter == 0) { timer.stop(); lblTimerE.setText("Time up"); } else { lblTimerE.setText("Wait for " + counter + " sec"); counter--; } } }; // end of action performed statement timer = new Timer(delay, action); timer.setInitialDelay(0); timer.start(); // this will start the timer } // end of method }代替活动。

尝试在DialogFragment或其他内容中添加此MyDatePickerFragment。

MainActivity

从你的onclick（）

调用片段

public class MyDatePickerFragment extends DialogFragment {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);
        DatePickerDialog datePickerDialog = new DatePickerDialog(getActivity(), dateSetListener, year, month, day);
        datePickerDialog.getDatePicker().setMinDate(System.currentTimeMillis());
        return datePickerDialog;
    }

    private DatePickerDialog.OnDateSetListener dateSetListener =
            new DatePickerDialog.OnDateSetListener() {
                public void onDateSet(DatePicker view, int year, int month, int day) {
                    String selectedDate = view.getDayOfMonth() + "/" + (view.getMonth() + 1) + "/" + view.getYear();
                    txtDate.setText(selectedDate);
                }
            };
}

如何将日期从一个活动传递到另一个活动？

4 个答案: