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Je suis assez nouveau à android, s'il vous plaît ne me dérange pas pour cette question idiote mais s'il vous plaît répondez si vous savez ... !! Alors que je commençais une nouvelle activité en utilisant l'intention, mais mon application malheureusement arrêté lorsque j'ai commencé une nouvelle activité.Error était java.lang.NullPointerException. J'ai perdu beaucoup de temps et je n'arrive pas à comprendre où est le problème.java.lang.nullpointerexception erreur
Ceci est la première activité:
package com.people.rock;
import com.android.taskreminder.R;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class ReminderListActivity extends ListActivity {
private static final int ACTIVITY_CREATE=0;
//private static final int ACTIVITY_EDIT=1;
private RemindersDbAdapter mDbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.reminder_list);
mDbHelper = new RemindersDbAdapter(this);
mDbHelper.open();
fillData();
registerForContextMenu(getListView());
}
@SuppressWarnings("deprecation")
private void fillData() {
Cursor remindersCursor = mDbHelper.fetchAllReminders();
startManagingCursor(remindersCursor);
// Create an array to specify the fields we want (only the TITLE)
String[] from = new String[]{RemindersDbAdapter.KEY_TITLE};
// and an array of the fields we want to bind in the view
int[] to = new int[]{R.id.text1};
// Now create a simple cursor adapter and set it to display
SimpleCursorAdapter reminders =
new SimpleCursorAdapter(this, R.layout.reminder_row, remindersCursor, from, to);
setListAdapter(reminders);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent i = new Intent(this, ReminderEditActivity.class);
i.putExtra("RowId", id);
startActivity(i);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo
menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
MenuInflater mi = getMenuInflater();
mi.inflate(R.menu.list_menu_item_longpress, menu);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.reminder_list, menu);
MenuInflater mi = getMenuInflater();
mi.inflate(R.menu.list_menu, menu);
return true;
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch(item.getItemId()) {
case R.id.menu_insert:
createReminder();
return true;
}
return super.onMenuItemSelected(featureId, item);
}
public boolean onContextItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.menu_delete:
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
mDbHelper.deleteReminder(info.id);
fillData();
return true;
}
return super.onContextItemSelected(item);
}
private void createReminder() {
Intent i = new Intent(this, ReminderEditActivity.class);
startActivityForResult(i, ACTIVITY_CREATE);
}
protected void onActivityResult(int requestCode, int resultCode, Intent intent)
{
super.onActivityResult(requestCode, resultCode, intent);
fillData();
}
}
C'est la nouvelle activité que j'ai appelé en utilisant l'intention.
package com.people.rock;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import com.android.taskreminder.R;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TimePicker;
import android.widget.Toast;
@SuppressLint("SimpleDateFormat") public class ReminderEditActivity extends Activity {
// all variables are declared before content view and are initiated after it.
private Button mTimeButton;
private Button mDateButton;
private static final String DATE_FORMAT = "yyyy-MM-dd";
private static final String TIME_FORMAT = "hour-minute";
public static final String DATE_TIME_FORMAT = "yyyy-MM-dd kk:mm:ss";
private static final int DATE_PICKER_DIALOG = 0;
private static final int TIME_PICKER_DIALOG = 1;
Calendar mCalendar;
private EditText mTitleText;
private Button mConfirmButton;
private EditText mBodyText;
private RemindersDbAdapter mDbHelper;
private Long mRowId;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.reminder_edit);
registerButtonListnerAndSetDefaultText();
//variable initiation
mDbHelper = new RemindersDbAdapter(this);
mDateButton=(Button) findViewById(R.id.reminder_date);
mTimeButton=(Button) findViewById(R.id.reminder_time);
mCalendar = Calendar.getInstance();
mConfirmButton = (Button) findViewById(R.id.confirm);
mTitleText = (EditText) findViewById(R.id.title);
mBodyText = (EditText) findViewById(R.id.body);
//to check whether any previous state exist which might be closed by killing of activity
mRowId = savedInstanceState != null
? savedInstanceState.getLong(RemindersDbAdapter.KEY_ROWID)
: null;
}
//to set id if we got it from intent declared in reminder_list activity
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();
}
//to fill the form of existing id which was killed by android
@SuppressWarnings("deprecation")
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);
}
}
updateDateButtonText();
updateTimeButtonText();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putLong(RemindersDbAdapter.KEY_ROWID, mRowId);
}
private void registerButtonListnerAndSetDefaultText(){
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();
}
});
mDateButton.setOnClickListener(new View.OnClickListener() {
@SuppressWarnings("deprecation")
@Override
public void onClick(View v) {
showDialog(DATE_PICKER_DIALOG);
}
});
mTimeButton.setOnClickListener(new View.OnClickListener() {
@SuppressWarnings("deprecation")
@Override
public void onClick(View v) {
showDialog(TIME_PICKER_DIALOG);
}
});
updateDateButtonText();
updateTimeButtonText();
}
@SuppressWarnings("deprecation")
protected Dialog onCreateDialog(int id) {
switch(id) {
case DATE_PICKER_DIALOG:
return showDatePicker();
case TIME_PICKER_DIALOG:
return showTimePicker();
}
return super.onCreateDialog(id);
}
@SuppressLint("SimpleDateFormat") 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;
}
private void updateDateButtonText() {
SimpleDateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
String dateForButton = dateFormat.format(mCalendar.getTime());
mDateButton.setText(dateForButton);
}
private TimePickerDialog showTimePicker() {
TimePickerDialog timePicker = new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {
@SuppressLint("SimpleDateFormat") @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;
}
@SuppressLint("SimpleDateFormat") private void updateTimeButtonText() {
SimpleDateFormat TimeFormat = new SimpleDateFormat(TIME_FORMAT);
String timeForButton = TimeFormat.format(mCalendar.getTime());
mDateButton.setText(timeForButton);
}
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);
}
}
C'est l'erreur que je reçois
07-16 08:04:30.620: D/dalvikvm(945): GC_FOR_ALLOC freed 44K, 4% free 3054K/3168K, paused 35ms, total 38ms
07-16 08:04:30.630: I/dalvikvm-heap(945): Grow heap (frag case) to 3.520MB for 500416-byte allocation
07-16 08:04:30.670: D/dalvikvm(945): GC_FOR_ALLOC freed 2K, 4% free 3540K/3660K, paused 33ms, total 33ms
07-16 08:04:31.570: I/Choreographer(945): Skipped 38 frames! The application may be doing too much work on its main thread.
07-16 08:04:31.800: D/gralloc_goldfish(945): Emulator without GPU emulation detected.
07-16 08:11:32.195: D/dalvikvm(945): GC_FOR_ALLOC freed 56K, 4% free 3717K/3840K, paused 108ms, total 109ms
07-16 08:11:32.195: I/dalvikvm-heap(945): Grow heap (frag case) to 4.142MB for 474384-byte allocation
07-16 08:11:32.425: D/dalvikvm(945): GC_FOR_ALLOC freed 13K, 4% free 4167K/4304K, paused 53ms, total 53ms
07-16 08:11:32.685: D/AndroidRuntime(945): Shutting down VM
07-16 08:11:32.685: W/dalvikvm(945): threadid=1: thread exiting with uncaught exception (group=0xb3a62ba8)
07-16 08:11:32.715: E/AndroidRuntime(945): FATAL EXCEPTION: main
07-16 08:11:32.715: E/AndroidRuntime(945): Process: com.android.taskreminder, PID: 945
07-16 08:11:32.715: E/AndroidRuntime(945): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.taskreminder/com.people.rock.ReminderEditActivity}: java.lang.NullPointerException
07-16 08:11:32.715: E/AndroidRuntime(945): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
07-16 08:11:32.715: E/AndroidRuntime(945): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
07-16 08:11:32.715: E/AndroidRuntime(945): at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-16 08:11:32.715: E/AndroidRuntime(945): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-16 08:11:32.715: E/AndroidRuntime(945): at android.os.Handler.dispatchMessage(Handler.java:102)
07-16 08:11:32.715: E/AndroidRuntime(945): at android.os.Looper.loop(Looper.java:136)
07-16 08:11:32.715: E/AndroidRuntime(945): at android.app.ActivityThread.main(ActivityThread.java:5017)
07-16 08:11:32.715: E/AndroidRuntime(945): at java.lang.reflect.Method.invokeNative(Native Method)
07-16 08:11:32.715: E/AndroidRuntime(945): at java.lang.reflect.Method.invoke(Method.java:515)
07-16 08:11:32.715: E/AndroidRuntime(945): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-16 08:11:32.715: E/AndroidRuntime(945): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-16 08:11:32.715: E/AndroidRuntime(945): at dalvik.system.NativeStart.main(Native Method)
07-16 08:11:32.715: E/AndroidRuntime(945): Caused by: java.lang.NullPointerException
07-16 08:11:32.715: E/AndroidRuntime(945): at com.people.rock.ReminderEditActivity.registerButtonListnerAndSetDefaultText(ReminderEditActivity.java:121)
07-16 08:11:32.715: E/AndroidRuntime(945): at com.people.rock.ReminderEditActivity.onCreate(ReminderEditActivity.java:47)
07-16 08:11:32.715: E/AndroidRuntime(945): at android.app.Activity.performCreate(Activity.java:5231)
07-16 08:11:32.715: E/AndroidRuntime(945): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-16 08:11:32.715: E/AndroidRuntime(945): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
07-16 08:11:32.715: E/AndroidRuntime(945): ... 11 more
07-16 08:11:36.505: I/Process(945): Sending signal. PID: 945 SIG: 9
Merci à l'avance
supprimer 'setContentView (R.layout.reminder_list);' –
post 'reminder_edit.xml' – Raghunandan