我有活动A，活动B.
从A到B我在创建期间在putExtra中发送data1 如果需要再次发送不同的更新包，则不幸的是关闭了活动。
公共类VehicleManagement扩展了Activity {
DBAdapter db;
private static final int ACTIVITY_EDIT=1;
private Button manVehbtnNewV,manVBtnSave,manVBtncancel,vehManReminder,ManVehBtnVehType;
private EditText manVehVNoEt;
private ArrayList<String> vehicleType = new ArrayList<String>();
String typeOfVehicle ,VehNo;
private RemindersDbAdapter mDbHelper;
private ListView vehReminderLV,listViewvehMan;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_manage_vehicles);
ManVehBtnVehType=(Button)findViewById(R.id.ManVehBtnVehType);
manVBtncancel=(Button)findViewById(R.id.manVBtncancel);
manVehVNoEt=(EditText)findViewById(R.id.ManVehEtVehNum);
manVBtncancel=(Button)findViewById(R.id.manVBtncancel);
vehManReminder=(Button)findViewById(R.id. vehManReminder);
vehReminderLV=(ListView)findViewById(R.id.vehReminderLV);
manVehbtnNewV.setOnClickListener( new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intentReminder= new Intent(getApplicationContext(),VehicleManagement.class);
startActivity(intentReminder); }
});
//
vehManReminder.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
VehNo = manVehVNoEt.getText().toString();
Toast.makeText(getApplicationContext(), VehNo, Toast.LENGTH_SHORT).show();
Intent intentReminder = new Intent(getApplicationContext(), ReminderEditActivity.class);
intentReminder.putExtra("ReminderVehNo", manVehVNoEt.getText().toString());
startActivity(intentReminder);
}
});
mDbHelper = new RemindersDbAdapter(this);
mDbHelper.open();
vehReminderLV.setOnItemClickListener( new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View selectedView, int position, long id) {
Intent i = new Intent(getApplicationContext(), ReminderEditActivity.class);
i.putExtra(RemindersDbAdapter.KEY_ROWID, id);
startActivityForResult(i, ACTIVITY_EDIT);
}
});
registerForContextMenu(vehReminderLV);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
fillData(manVehVNoEt.getText().toString());
}
接受活动：
公共类ReminderEditActivity扩展了Activity {
private static final int DATE_PICKER_DIALOG = 0;
private static final int TIME_PICKER_DIALOG = 1;
private static final String DATE_FORMAT = "yyyy-MM-dd";
private static final String TIME_FORMAT = "kk:mm";
public static final String DATE_TIME_FORMAT = "yyyy-MM-dd kk:mm:ss";
private EditText mTitleText;
private EditText mBodyText;
private Button mDateButton;
private Button mTimeButton;
private Button mConfirmButton;
private Long mRowId;
private RemindersDbAdapter mDbHelper;
private Calendar mCalendar;
private TextView mTitleVehNo;
Spinner spinnerReminder;
String VehNospinner,vehReminder;
List<String> lable;
DBAdapter db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDbHelper = new RemindersDbAdapter(this);
setContentView(R.layout.reminder_edit);
mCalendar = Calendar.getInstance();
mTitleText = (EditText) findViewById(R.id.title);
mBodyText = (EditText) findViewById(R.id.body);
mDateButton = (Button) findViewById(R.id.reminder_date);
mTimeButton = (Button) findViewById(R.id.reminder_time);
mConfirmButton = (Button) findViewById(R.id.confirm);
String vehReminder= getIntent().getStringExtra("ReminderVehNo");
mTitleText.setText(vehReminder);
mRowId = savedInstanceState != null ? savedInstanceState.getLong(RemindersDbAdapter.KEY_ROWID)
: null;
registerButtonListenersAndSetDefaultText();
}
private void setRowIdFromIntent() {
if (mRowId == null) {
Bundle extras = getIntent().getExtras();
mRowId = extras != null ? extras.getLong(RemindersDbAdapter.KEY_ROWID)
: null;
}
}
@Override
protected void onPause() {
super.onPause();
mDbHelper.close();
}
@Override
protected void onResume() {
super.onResume();
mDbHelper.open();
setRowIdFromIntent();
populateFields();
}
@Override
protected Dialog onCreateDialog(int id) {
switch(id) {
case DATE_PICKER_DIALOG:
return showDatePicker();
case TIME_PICKER_DIALOG:
return showTimePicker();
}
return super.onCreateDialog(id);
}
private DatePickerDialog showDatePicker() {
DatePickerDialog datePicker = new DatePickerDialog(ReminderEditActivity.this, new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
mCalendar.set(Calendar.YEAR, year);
mCalendar.set(Calendar.MONTH, monthOfYear);
mCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
updateDateButtonText();
}
}, mCalendar.get(Calendar.YEAR), mCalendar.get(Calendar.MONTH), mCalendar.get(Calendar.DAY_OF_MONTH));
return datePicker;
}
私人TimePickerDialog showTimePicker（）{
TimePickerDialog timePicker = new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
mCalendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
mCalendar.set(Calendar.MINUTE, minute);
updateTimeButtonText();
}
}, mCalendar.get(Calendar.HOUR_OF_DAY), mCalendar.get(Calendar.MINUTE), true);
return timePicker;
}
private void registerButtonListenersAndSetDefaultText() {
mDateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showDialog(DATE_PICKER_DIALOG);
}
});
mTimeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showDialog(TIME_PICKER_DIALOG);
}
});
mConfirmButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
saveState();
setResult(RESULT_OK);
Toast.makeText(ReminderEditActivity.this, getString(R.string.task_saved_message), Toast.LENGTH_SHORT).show();
finish();
}
});
updateDateButtonText();
updateTimeButtonText();
}
private void populateFields() {
if (mRowId != null) {
Cursor reminder = mDbHelper.fetchReminder(mRowId);
startManagingCursor(reminder);
mTitleText.setText(reminder.getString(
reminder.getColumnIndexOrThrow(RemindersDbAdapter.KEY_TITLE)));
mBodyText.setText(reminder.getString(
reminder.getColumnIndexOrThrow(RemindersDbAdapter.KEY_BODY)));
SimpleDateFormat dateTimeFormat = new SimpleDateFormat(DATE_TIME_FORMAT);
Date date = null;
try {
String dateString = reminder.getString(reminder.getColumnIndexOrThrow(RemindersDbAdapter.KEY_DATE_TIME));
date = dateTimeFormat.parse(dateString);
mCalendar.setTime(date);
} catch (ParseException e) {
Log.e("ReminderEditActivity", e.getMessage(), e);
}
} else {
// This is a new task - add defaults from preferences if set.
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String defaultTitleKey = getString(R.string.pref_task_title_key);
String defaultTimeKey = getString(R.string.pref_default_time_from_now_key);
String defaultTitle = prefs.getString(defaultTitleKey, null);
String defaultTime = prefs.getString(defaultTimeKey, null);
if(defaultTitle != null)
mTitleText.setText(defaultTitle);
if(defaultTime != null)
mCalendar.add(Calendar.MINUTE, Integer.parseInt(defaultTime));
}
updateDateButtonText();
updateTimeButtonText();
}
private void updateTimeButtonText() {
// Set the time button text based upon the value from the database
SimpleDateFormat timeFormat = new SimpleDateFormat(TIME_FORMAT);
String timeForButton = timeFormat.format(mCalendar.getTime());
mTimeButton.setText(timeForButton);
}
private void updateDateButtonText() {
// Set the date button text based upon the value from the database
SimpleDateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
String dateForButton = dateFormat.format(mCalendar.getTime());
mDateButton.setText(dateForButton);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putLong(RemindersDbAdapter.KEY_ROWID, mRowId);
}
private void saveState() {
String title = mTitleText.getText().toString();
String body = mBodyText.getText().toString();
SimpleDateFormat dateTimeFormat = new SimpleDateFormat(DATE_TIME_FORMAT);
String reminderDateTime = dateTimeFormat.format(mCalendar.getTime());
if (mRowId == null) {
long id = mDbHelper.createReminder(title, body, reminderDateTime);
if (id > 0) {
mRowId = id;
}
} else {
mDbHelper.updateReminder(mRowId, title, body, reminderDateTime);
}
new ReminderManager(this).setReminder(mRowId, mCalendar);
}
}
答案 0 :(得分：1)
使用SharedPreference。您可以保存并从任何活动中检索。
<强>初始化
SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0); // 0 - for private mode
Editor editor = pref.edit();
存储数据
editor.putBoolean("key_name", true); // Storing boolean - true/false
editor.putString("key_name", "string value"); // Storing string
editor.putInt("key_name", "int value"); // Storing integer
editor.putFloat("key_name", "float value"); // Storing float
editor.putLong("key_name", "long value"); // Storing long
editor.commit(); // commit changes
检索数据
// returns stored preference value
// If value is not present return second param value - In this case null
pref.getString("key_name", null); // getting String
pref.getInt("key_name", null); // getting Integer
pref.getFloat("key_name", null); // getting Float
pref.getLong("key_name", null); // getting Long
pref.getBoolean("key_name", null); // getting boolean
删除数据
editor.remove("name"); // will delete key name
editor.remove("email"); // will delete key email
editor.commit(); // commit changes
清算存储空间
editor.clear();
editor.commit(); // commit changes