Question

在时间选择器中的选定时间创建通知时，我做了所有事情，但是我无法将其传递给另一个活动中的textview。有人可以帮我弄这个吗？

点击“完成”按钮后，我想将时间值从SecondActivity传递到textView中名为textviewAlarm的{{1}}。

HomeActivity

我希望我选择的时间显示在public class Second extends AppCompatActivity implements View.OnClickListener{ private int notificationId = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.second_layout); // Set Onclick Listener. findViewById(R.id.setBtn).setOnClickListener(this); findViewById(R.id.cancelBtn).setOnClickListener(this); } @Override public void onClick(View view) { EditText editText = findViewById(R.id.editText); TimePicker timePicker = findViewById(R.id.timePicker); // Set notificationId & text. Intent intent = new Intent(Second.this, AlarmReceiver.class); intent.putExtra("notificationId", notificationId); intent.putExtra("todo", editText.getText().toString()); // getBroadcast(context, requestCode, intent, flags) PendingIntent alarmIntent = PendingIntent.getBroadcast(Second.this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT); AlarmManager alarm = (AlarmManager) getSystemService(ALARM_SERVICE); switch (view.getId()) { case R.id.setBtn: int hour = timePicker.getCurrentHour(); int minute = timePicker.getCurrentMinute(); // Create time. Calendar startTime = Calendar.getInstance(); startTime.set(Calendar.HOUR_OF_DAY, hour); startTime.set(Calendar.MINUTE, minute); startTime.set(Calendar.SECOND, 0); long alarmStartTime = startTime.getTimeInMillis(); // Set alarm. // set(type, milliseconds, intent) alarm.set(AlarmManager.RTC_WAKEUP, alarmStartTime, alarmIntent); // Get TextView object which is used to show user pick date and time. TextView textView = (TextView)findViewById(R.id.textViewAlarm); StringBuffer strBuffer = new StringBuffer(); strBuffer.append("You selected date time : "); strBuffer.append(this.notificationId); textView.setText(strBuffer.toString()); break; case R.id.cancelBtn: alarm.cancel(alarmIntent); Toast.makeText(this, "Canceled.", Toast.LENGTH_SHORT).show(); break; } } }的{{1}}中。

Answer 1

您可以通过添加

从时间选择器中获取时间。

timePicker.setOnTimeChangedListener( new TimePicker.onTimeChangedListener() {

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

                    time = String.valueOf(hourOfDay).toString() + ":" + String.valueOf(minute).toString();
                }

}

当用户更改时间时，它将为变量分配时间，并按如下所示通过意图传递该参数

Intent intent = new Intent(Second.this, AlarmReceiver.class);
intent.putExtra("notificationId", notificationId);
intent.putExtra("time", time);

从HomeActivity中获取传递的参数，并将其设置为TextView，如下所示：

textviewAlarm.setText(time.toSring());

如何在Android Studio（Java）的另一个活动中将时间值从时间选择器传递到textView？

1 个答案: