一个活动数据正在传输到另一个活动

Question

我在程序中的某个地方遇到了逻辑错误，发生的事情是当我在 MainActivity 中使用时间选择器和 Switch 时，然后选择的时间和 Switch state 在我的另一个活动中发生更改，即：UtilMainActivity 这是一个子类。 但是，当我更改开关 state 和 UtilMainActivity 中的时间时，它不会导致开关 state 和 MainActivity 中的警报时间发生变化。我真正需要的是当我更改警报时间并且 MainActivity 中的开关不会导致更改时间并切换到我的 UtilMainActivity.......希望你能理解我的问题。 这是我的主要活动。

实用程序主活动

public class UtilMainActivity extends AppCompatActivity implements
    TimePickerDialog.OnTimeSetListener {

SwitchCompat onOffSwitch;
TextView firstAlarmTextView;
TextView timeLeftTextView;
LinearLayout firstAlarmLayout;
UtilSharedPreferencesHelper sharPrefHelper;
UtilTimerManager utilTimerManager;
UtilAlarmParams utilAlarmParams;
BroadcastReceiver timeLeftReceiver;
private final String LOG_TAG = UtilMainActivity.class.getSimpleName();

final int ACTION_MANAGE_OVERLAY_PERMISSION_REQUEST_CODE = 45;
final float DISPLAYED_NUMBERS_SIZE_RELATIVE_TO_TEXT_PROPORTION = 2f;  // number of alarms, first alarm, interval values text size is larger than text around them

@RequiresApi(api = Build.VERSION_CODES.M)
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.utility_activity_main);
    onOffSwitch = (SwitchCompat) findViewById(R.id.switch_main);
    firstAlarmLayout = (LinearLayout) findViewById(R.id.layout_main_firstalarm);
    firstAlarmTextView = (TextView) findViewById(R.id.textview_main_firstalarm_time);
    timeLeftTextView = (TextView) findViewById(R.id.textview_main_timeleft);

    sharPrefHelper = new UtilSharedPreferencesHelper(UtilMainActivity.this);
    sharPrefHelper.printAll();

    utilAlarmParams = sharPrefHelper.utilgetParams();
    utilTimerManager = new UtilTimerManager(UtilMainActivity.this);

    showFirstAlarmTime(utilAlarmParams.firstUtilAlarmTime.toString());
    showTimeLeft(utilAlarmParams);

    onOffSwitch.setChecked(sharPrefHelper.isAlarmTurnedOn());


    onOffSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @RequiresApi(api = Build.VERSION_CODES.M)
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            utilAlarmParams.turnedOn = isChecked;
            if (isChecked) {
                checkNotificationPolicy();
                checkOverlayPermission();
                utilTimerManager.startSingleAlarmTimer(utilAlarmParams.firstUtilAlarmTime.toMillis());
                showToast(getString(R.string.utility_main_alarm_turned_on_toast));
            } else {
                utilTimerManager.cancelTimer();
                showToast(getString(R.string.utility_main_alarm_turned_off_toast));
            }
            showTimeLeft(utilAlarmParams);
            sharPrefHelper.utilsetAlarmState(isChecked);
        }
    });


    firstAlarmLayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Bundle timePickerBundle = new Bundle();
            timePickerBundle.putInt(UtilTimePickerDialogFragment.BUNDLE_KEY_ALARM_HOUR, sharPrefHelper.utilgetHour());
            timePickerBundle.putInt(UtilTimePickerDialogFragment.BUNDLE_KEY_ALARM_MINUTE, sharPrefHelper.utilgetMinute());

            UtilTimePickerDialogFragment timePicker = new UtilTimePickerDialogFragment();

            timePicker.setArguments(timePickerBundle);
            timePicker.show(getFragmentManager(), UtilTimePickerDialogFragment.FRAGMENT_TAG);
        }
    });

}

@RequiresApi(api = Build.VERSION_CODES.M)
@Override
protected void onResume() {
    super.onResume();
    showTimeLeft(utilAlarmParams);
    timeLeftReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context ctx, Intent intent) {
            if (intent.getAction().compareTo(Intent.ACTION_TIME_TICK) == 0) {  //i.e. every minute
                showTimeLeft(utilAlarmParams);
            }
        }
    };
    registerReceiver(timeLeftReceiver, new IntentFilter(Intent.ACTION_TIME_TICK));
}

@Override
protected void onPause() {
    super.onPause();
    if (timeLeftReceiver != null) {
        unregisterReceiver(timeLeftReceiver);
    }
}
@RequiresApi(api = Build.VERSION_CODES.M)
@Override
public void onTimeSet(TimePicker view, int hour, int minute) {
    UtilAlarmTime utilAlarmTime = new UtilAlarmTime(hour, minute);
    utilAlarmParams.firstUtilAlarmTime = utilAlarmTime;
    showFirstAlarmTime(utilAlarmTime.toString());
    showTimeLeft(utilAlarmParams);
    resetTimerIfTurnedOn();
    sharPrefHelper.utilsetTime(utilAlarmTime);
}

private void showToast(String message) {
    Toast.makeText(UtilMainActivity.this, message, Toast.LENGTH_SHORT).show();
}

private void resetTimerIfTurnedOn() {
    if (onOffSwitch.isChecked()) {
        utilTimerManager.resetSingleAlarmTimer(utilAlarmParams.firstUtilAlarmTime.toMillis());
        showToast(getString(R.string.utility_main_alarm_reset_toast));
    }
}


private void showFirstAlarmTime(String firstAlarmTime) {
    String wholeTitle = getString(R.string.utility_main_firstalarm_time, firstAlarmTime);
    SpannableString wholeTitleSpan = new SpannableString(wholeTitle);
    wholeTitleSpan.setSpan(new RelativeSizeSpan(DISPLAYED_NUMBERS_SIZE_RELATIVE_TO_TEXT_PROPORTION),
            wholeTitle.indexOf(firstAlarmTime) - 1,
            wholeTitle.indexOf(firstAlarmTime) + firstAlarmTime.length(), 0);
    firstAlarmTextView.setText(wholeTitleSpan);
}

@RequiresApi(api = Build.VERSION_CODES.M)
private void showTimeLeft(UtilAlarmParams utilAlarmParams) {
    UtilAlarmTime utilAlarmTime = utilAlarmParams.firstUtilAlarmTime;
    timeLeftTextView.setText(getString(R.string.utility_all_time_left, utilAlarmTime.getHoursLeft(), utilAlarmTime.getMinutesLeft()));
    if (utilAlarmParams.turnedOn) {
        timeLeftTextView.setTextColor(getColor(R.color.primary));
    } else {
        timeLeftTextView.setTextColor(getColor(R.color.main_disabled_textcolor));
    }
    Log.d(LOG_TAG, "Time left: "+ utilAlarmTime.getHoursLeft() + ":" + utilAlarmTime.getMinutesLeft());
}

private void checkNotificationPolicy() {
    NotificationManager notificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
            && !notificationManager.isNotificationPolicyAccessGranted()) {
        Intent intent = new Intent(
                android.provider.Settings
                        .ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS);
        startActivity(intent);
    }
}

/**
 * needed for Android Q: on some devices activity doesn't show from fullScreenNotification without
 * permission SYSTEM_ALERT_WINDOW
 */
@RequiresApi(api = Build.VERSION_CODES.M)
private void checkOverlayPermission() {
    if ((Build.VERSION.SDK_INT > Build.VERSION_CODES.P) && (!Settings.canDrawOverlays(this))) {
        Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                Uri.parse("package:" + this.getPackageName()));
        startActivityForResult(intent, ACTION_MANAGE_OVERLAY_PERMISSION_REQUEST_CODE);
    }
}
}

主要活动

public class MainActivity extends AppCompatActivity implements
    IntervalDialogFragment.IntervalDialogListener,
    NumberOfAlarmsDialogFragment.NumberOfAlarmsDialogListener,
    TimePickerDialog.OnTimeSetListener {

SwitchCompat onOffSwitch;
ListView alarmsListView;
TextView intervalBetweenAlarmsTextView;
TextView numberOfAlarmsTextView;
TextView firstAlarmTextView;
TextView timeLeftTextView;
LinearLayout firstAlarmLayout;
LinearLayout intervalLayout;
LinearLayout numberOfAlarmsLayout;
AlarmsListHelper alarmsListHelper;
SharedPreferencesHelper sharPrefHelper;
TimerManager timerManager;
AlarmParams alarmParams;
BroadcastReceiver timeLeftReceiver;
Button sleepTimer;
private final String LOG_TAG = MainActivity.class.getSimpleName();

final int ACTION_MANAGE_OVERLAY_PERMISSION_REQUEST_CODE = 45;
final float DISPLAYED_NUMBERS_SIZE_RELATIVE_TO_TEXT_PROPORTION = 2f;  // number of alarms, first alarm, interval values text size is larger than text around them

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    alarmsListView = (ListView) findViewById(R.id.listview_main_alarmslist);
    onOffSwitch = (SwitchCompat) findViewById(R.id.util_switch_main);
    intervalBetweenAlarmsTextView = (TextView) findViewById(R.id.textview_main_interval);
    numberOfAlarmsTextView = (TextView) findViewById(R.id.textview_main_numberofalarms);
    firstAlarmLayout = (LinearLayout) findViewById(R.id.layout_main_firstalarm);
    firstAlarmTextView = (TextView) findViewById(R.id.util_textview_main_firstalarm_time);
    timeLeftTextView = (TextView) findViewById(R.id.textview_main_timeleft);
    intervalLayout = (LinearLayout) findViewById(R.id.layout_main_interval);
    numberOfAlarmsLayout = (LinearLayout) findViewById(R.id.layout_main_numberofalarms);
    sleepTimer = (Button) findViewById(R.id.sleepTimer);

    sharPrefHelper = new SharedPreferencesHelper(MainActivity.this);
    sharPrefHelper.printAll();

    alarmParams = sharPrefHelper.getParams();
    timerManager = new TimerManager(MainActivity.this);
    alarmsListHelper = new AlarmsListHelper(MainActivity.this, alarmsListView);

    showFirstAlarmTime(alarmParams.firstAlarmTime.toString());
    showTimeLeft(alarmParams);

    showInterval(sharPrefHelper.getIntervalStr());
    showNumberOfAlarms(sharPrefHelper.getNumberOfAlarmsStr());
    onOffSwitch.setChecked(sharPrefHelper.isAlarmTurnedOn());

    alarmsListHelper.showList(alarmParams);

    onOffSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            alarmParams.turnedOn = isChecked;
            if (isChecked) {
                checkNotificationPolicy();
                checkOverlayPermission();
                timerManager.startSingleAlarmTimer(alarmParams.firstAlarmTime.toMillis());
                showToast(getString(R.string.main_alarm_turned_on_toast));
                sharPrefHelper.setNumberOfAlreadyRangAlarms(0);
            } else {
                timerManager.cancelTimer();
                showToast(getString(R.string.main_alarm_turned_off_toast));
            }
            alarmsListHelper.showList(alarmParams);
            showTimeLeft(alarmParams);
            sharPrefHelper.setAlarmState(isChecked);
        }
    });

    intervalLayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            IntervalDialogFragment dialog = new IntervalDialogFragment();
            Bundle intervalBundle = new Bundle();
            intervalBundle.putString(IntervalDialogFragment.BUNDLE_KEY_INTERVAL, sharPrefHelper.getIntervalStr());
            dialog.setArguments(intervalBundle);
            dialog.show(getFragmentManager(), IntervalDialogFragment.FRAGMENT_TAG);
        }
    });

    numberOfAlarmsLayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            NumberOfAlarmsDialogFragment dialog = new NumberOfAlarmsDialogFragment();
            Bundle numberOfAlarmsBundle = new Bundle();
            numberOfAlarmsBundle.putString(NumberOfAlarmsDialogFragment.BUNDLE_KEY_NUMBER_OF_ALARMS, sharPrefHelper.getNumberOfAlarmsStr());
            dialog.setArguments(numberOfAlarmsBundle);
            dialog.show(getFragmentManager(), NumberOfAlarmsDialogFragment.FRAGMENT_TAG);
        }
    });

    firstAlarmLayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Bundle timePickerBundle = new Bundle();
            timePickerBundle.putInt(TimePickerDialogFragment.BUNDLE_KEY_ALARM_HOUR, sharPrefHelper.getHour());
            timePickerBundle.putInt(TimePickerDialogFragment.BUNDLE_KEY_ALARM_MINUTE, sharPrefHelper.getMinute());

            TimePickerDialogFragment timePicker = new TimePickerDialogFragment();

            timePicker.setArguments(timePickerBundle);
            timePicker.show(getFragmentManager(), TimePickerDialogFragment.FRAGMENT_TAG);
        }
    });

    sleepTimer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            openNewActivity();
        }
    });


}
public void openNewActivity(){
    Intent intent = new Intent(this, SleepTimerActivity.class);
    startActivity(intent);
}

@Override
protected void onResume() {
    super.onResume();
    showTimeLeft(alarmParams);
    timeLeftReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context ctx, Intent intent) {
            if (intent.getAction().compareTo(Intent.ACTION_TIME_TICK) == 0) {  //i.e. every minute
                showTimeLeft(alarmParams);
            }
        }
    };
    registerReceiver(timeLeftReceiver, new IntentFilter(Intent.ACTION_TIME_TICK));
}



@Override
protected void onPause() {
    super.onPause();
    if (timeLeftReceiver != null) {
        unregisterReceiver(timeLeftReceiver);
    }
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    new Handler().post(new Runnable() {
        @Override
        public void run() {
            final View view = findViewById(R.id.scheduleactivity);

            if (view != null) {
                view.setOnLongClickListener(new View.OnLongClickListener() {
                    @Override
                    public boolean onLongClick(View v) {

                        // Do something...

                        Toast.makeText(getApplicationContext(), "Scheduled Utilities Stopper", Toast.LENGTH_SHORT).show();
                        return true;
                    }
                });
            }
        }
    });
    return super.onCreateOptionsMenu(menu);
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    switch (id) {
        case R.id.action_settings: {
            Intent intent = new Intent(this, PrefActivity.class);
            startActivity(intent);
            break;
        }
        case R.id.scheduleactivity: {
            Intent intent = new Intent(this, UtilMainActivity.class);
            startActivity(intent);
            break;
        }
    }
    return super.onOptionsItemSelected(item);
}


@Override
public void onIntervalChanged(String intervalStr) {
    showInterval(intervalStr);
    alarmParams.interval = Integer.parseInt(intervalStr);
    alarmsListHelper.showList(alarmParams);
    resetTimerIfTurnedOn();
    sharPrefHelper.setInterval(intervalStr);
}

@Override
public void onNumberOfAlarmsChanged(String numberOfAlarmsStr) {
    showNumberOfAlarms(numberOfAlarmsStr);
    alarmParams.numberOfAlarms = Integer.parseInt(numberOfAlarmsStr);
    alarmsListHelper.showList(alarmParams);
    resetTimerIfTurnedOn();
    sharPrefHelper.setNumberOfAlarms(numberOfAlarmsStr);
}

@Override
public void onTimeSet(TimePicker view, int hour, int minute) {
    AlarmTime alarmTime = new AlarmTime(hour, minute);
    alarmParams.firstAlarmTime = alarmTime;
    showFirstAlarmTime(alarmTime.toString());
    alarmsListHelper.showList(alarmParams);
    showTimeLeft(alarmParams);
    sharPrefHelper.setNumberOfAlreadyRangAlarms(0);
    resetTimerIfTurnedOn();
    sharPrefHelper.setTime(alarmTime);
}

private void showToast(String message) {
    Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();
}

private void resetTimerIfTurnedOn() {
    if (onOffSwitch.isChecked()) {
        timerManager.resetSingleAlarmTimer(alarmParams.firstAlarmTime.toMillis());
        showToast(getString(R.string.main_alarm_reset_toast));
    }
}

private void showInterval(String interval) {
    String wholeTitle = getString(R.string.main_interval, interval);
    SpannableString wholeTitleSpan = new SpannableString(wholeTitle);
    wholeTitleSpan.setSpan(new RelativeSizeSpan(DISPLAYED_NUMBERS_SIZE_RELATIVE_TO_TEXT_PROPORTION), wholeTitle.indexOf(interval), interval.length() + 1, 0);
    intervalBetweenAlarmsTextView.setText(wholeTitleSpan);
}

private void showNumberOfAlarms(String numberOfAlarms) {
    int numberOfAlarmsInt = Integer.parseInt(numberOfAlarms);
    String wholeTitle = this.getResources().getQuantityString(R.plurals.main_number_of_alarms, numberOfAlarmsInt, numberOfAlarmsInt);
    SpannableString wholeTitleSpan = new SpannableString(wholeTitle);
    wholeTitleSpan.setSpan(new RelativeSizeSpan(DISPLAYED_NUMBERS_SIZE_RELATIVE_TO_TEXT_PROPORTION),
            wholeTitle.indexOf(numberOfAlarms),
            numberOfAlarms.length() + 1, 0);
    numberOfAlarmsTextView.setText(wholeTitleSpan);
}

private void showFirstAlarmTime(String firstAlarmTime) {
    String wholeTitle = getString(R.string.main_firstalarm_time, firstAlarmTime);
    SpannableString wholeTitleSpan = new SpannableString(wholeTitle);
    wholeTitleSpan.setSpan(new RelativeSizeSpan(DISPLAYED_NUMBERS_SIZE_RELATIVE_TO_TEXT_PROPORTION),
            wholeTitle.indexOf(firstAlarmTime) - 1,
            wholeTitle.indexOf(firstAlarmTime) + firstAlarmTime.length(), 0);
    firstAlarmTextView.setText(wholeTitleSpan);
}

private void showTimeLeft(AlarmParams alarmParams) {
    AlarmTime alarmTime = alarmParams.firstAlarmTime;
    timeLeftTextView.setText(getString(R.string.all_time_left, alarmTime.getHoursLeft(), alarmTime.getMinutesLeft()));
    if (alarmParams.turnedOn) {
        timeLeftTextView.setTextColor(getColor(R.color.primary));
    } else {
        timeLeftTextView.setTextColor(getColor(R.color.main_disabled_textcolor));
    }
    Log.d(LOG_TAG, "Time left: "+alarmTime.getHoursLeft() + ":" + alarmTime.getMinutesLeft());
}

private void checkNotificationPolicy() {
    NotificationManager notificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
            && !notificationManager.isNotificationPolicyAccessGranted()) {
        Intent intent = new Intent(
                android.provider.Settings
                        .ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS);
        startActivity(intent);
    }
}

/**
 * needed for Android Q: on some devices activity doesn't show from fullScreenNotification without
 * permission SYSTEM_ALERT_WINDOW
 */
private void checkOverlayPermission() {
    if ((Build.VERSION.SDK_INT > Build.VERSION_CODES.P) && (!Settings.canDrawOverlays(this))) {
        Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                Uri.parse("package:" + this.getPackageName()));
        startActivityForResult(intent, ACTION_MANAGE_OVERLAY_PERMISSION_REQUEST_CODE);
    }
}

}

Answer 1

你的活动，不会得到新的数据，因为它的接收者已经取消注册，为了让你更容易，我建议你用startActivityForResult开始活动，当你完成后，你可以设置数据和以前的活动将在此回调onActivityResult(...)上以bundle的形式接收数据