当我尝试将所有联系人从数据库导出到SD卡时，我收到一条错误消息：java.io.FileNotFoundException：/data/data/com.androidhive.androidsqlite/databases/contactsManager：openfailes：EACCES（权限被拒绝）
导入时出现相同的错误，列表中没有任何内容显示。请帮忙
这是导出导入函数的代码'
Button b1 =(Button)
findViewById(R.id.button1);
b1.setOnClickListener(new View.OnClickListener() {
//--------------------------------------------------------------------------------------------
//------------------------------------exporter------------------------------------------------
//--------------------------------------------------------------------------------------------
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
try {
try {
// File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
// Log.i("sd", "" + sd.canWrite());
if (sd.canWrite()) {
// String currentDBPath = "data/com.android.les_contacts/databases/contactsManager";
String currentDBPath = "data/com.androidhive.androidsqlite/databases/contactsManager";
String backupDBPath = "BackupContacts";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
if (currentDB.exists()) {
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
Toast.makeText(getApplicationContext(), "Vos contacts ont �t� export�s avec succ�s!", Toast.LENGTH_SHORT).show();
}
}
//----------------test2-----------------------------------
db.deleteContact( db.getContact(0));
// Reading all contacts
Log.d("test2: ", "Reading all contacts.. apr� exportation");
List<Contact> contacts;
contacts=db.getAllContacts();
for (Contact cn : contacts) {
String log = "id: "+cn.get_id()+" ,nom: " + cn.get_nom() + " ,num: " + cn.get_num()
+ " ,email: " + cn.get_email()
+ " ,adresse: " + cn.get_adresse();
// Writing Contacts to log
Log.d("nom: ", log);
}
//----------------test2-----------------------------------
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
.show();
}
}
});
//=======================================================================================================
Button b2 =( Button ) findViewById(R.id.button2);
b2.setOnClickListener(new View.OnClickListener() {
//--------------------------------------------------------------------------------------------
//------------------------------------importer------------------------------------------------
//--------------------------------------------------------------------------------------------
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
try {
// File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
// String currentDBPath = "data/com.android.les_contacts/databases/contactsManager";
String currentDBPath = "data/com.androidhive.androidsqlite/databases/contactsManager";
String backupDBPath = "BackupContacts";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
if (currentDB.exists()) {
FileChannel src = new FileInputStream(backupDB).getChannel();
FileChannel dst = new FileOutputStream(currentDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
Toast.makeText(getApplicationContext(), "Vos contacts ont �t� import�s avec succ�s", Toast.LENGTH_SHORT).show();
}
}
//----------------test1-----------------------------------
// Reading all contacts
Log.d("test1: ", "Reading all contacts.. apr� importation");
List<Contact> contacts=new ArrayList<>();
contacts=db.getAllContacts();
for (Contact cn : contacts) {
String log = "id: "+cn.get_id()+" ,nom: " + cn.get_nom() + " ,num: " + cn.get_num()
+ " ,email: " + cn.get_email()
+ " ,adresse: " + cn.get_adresse();
// Writing Contacts to log
Log.d("nom: ", log);
}
//----------------test1-----------------------------------
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
.show();
}
}
});
}
}`
主要活动 '
public class MainActivity extends Activity {
private static final int edit =0,supp=1;
EditText nameTxt, phoneTxt, emailTxt, adressTxt;
List<Contact> Contacts=new ArrayList<>();
ListView contactListView;
MySQLiteHelper db;
int longClickedItemIndex;
ArrayAdapter<Contact> contactAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
nameTxt = (EditText) findViewById(R.id.txtName);
phoneTxt = (EditText) findViewById(R.id.txtPhone);
emailTxt = (EditText) findViewById(R.id.txtEmail);
adressTxt = (EditText) findViewById(R.id.txtAdress);
contactListView= (ListView) findViewById(R.id.listView) ;
db= new MySQLiteHelper(getApplicationContext());
registerForContextMenu(contactListView);
contactListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> adapterView, View view, int position, long id) {
longClickedItemIndex= position;
return false;
}
});
TabHost tabHost = (TabHost) findViewById(R.id.tabHost);
tabHost.setup();
TabHost.TabSpec tabSpec = tabHost.newTabSpec("Ajouter");
tabSpec.setContent(R.id.Creatortab);
tabSpec.setIndicator("Ajouter ");
tabHost.addTab(tabSpec);
tabSpec = tabHost.newTabSpec("Liste");
tabSpec.setContent(R.id.listView);
tabSpec.setIndicator("Liste");
tabHost.addTab(tabSpec);
Button syncBtn =(Button) findViewById(R.id.btnSyncr);
final Button addBtn =(Button) findViewById(R.id.btnAdd);
nameTxt.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {
addBtn.setEnabled(String.valueOf(nameTxt.getText()).trim().length() >0);
}
@Override
public void afterTextChanged(Editable editable) {
}
});
// Bouton Ajouter
addBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {Contact contact=new Contact(db.getContactsCount(),String.valueOf(nameTxt.getText())
,String.valueOf(phoneTxt.getText()),String.valueOf(emailTxt.getText()),String.valueOf(adressTxt.getText()));
if(!contactExists(contact)) {
db.addContact(contact);
Contacts.add(contact);
contactAdapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(),nameTxt.getText().toString() + " a ete crée",Toast.LENGTH_SHORT).show();
return;
}
Toast.makeText(getApplicationContext(),nameTxt.getText().toString() + " existe deja ressayer aves un autre Nom",Toast.LENGTH_SHORT).show();
}
});
// Bouton Syncroniser
syncBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent=new Intent(view.getContext(),Main.class);
startActivityForResult(intent,0);
}
});
if(db.getContactsCount() != 0)
Contacts.addAll(db.getAllContacts());
populateList()
}
public void onCreateContextMenu(ContextMenu menu, View view,ContextMenu.ContextMenuInfo menuInfo){
super.onCreateContextMenu(menu, view, menuInfo);
menu.setHeaderIcon(R.drawable.pencil_icon);
menu.setHeaderTitle("Option");
menu.add(Menu.NONE, edit,Menu.NONE,"Editer Contacte");
menu.add(Menu.NONE, supp,Menu.NONE,"Supprimer Contacte");
}
public boolean onContextItemSelected(MenuItem item){
switch (item.getItemId())
{
case edit :
//TODO: Implement editing a contact
break;
case supp:
db.deleteContact(Contacts.get(longClickedItemIndex));
Contacts.remove(longClickedItemIndex);
contactAdapter.notifyDataSetChanged();
break;
}
return super.onContextItemSelected(item);
}
private boolean contactExists(Contact contact){
String name = contact.get_nom();
int contactCount = Contacts.size();
for(int i = 0; i < contactCount; i++){
if(name.compareToIgnoreCase(Contacts.get(i).get_nom()) == 0)
return true;
}
return false;
}
private void populateList(){
contactAdapter = new ContactListeAdapter();
contactListView.setAdapter(contactAdapter);
}
private class ContactListeAdapter extends ArrayAdapter<Contact>{
private ContactListeAdapter() {
super(MainActivity.this,R.layout.listview,Contacts);
}
@Override
public View getView(int position, View view, ViewGroup parent){
if(view ==null) //view n'est pas null
view = getLayoutInflater().inflate(R.layout.listview, parent, false);
Contact currentContact = Contacts.get(position);
TextView nom =(TextView) view.findViewById(R.id.contactName);
nom.setText(currentContact.get_nom());
TextView num =(TextView) view.findViewById(R.id.phoneNumber);
num.setText(currentContact.get_num());
TextView email =(TextView) view.findViewById(R.id.emailAddress);
email.setText(currentContact.get_email());
TextView adresse =(TextView) view.findViewById(R.id.cAddress);
adresse.setText(currentContact.get_adresse());
return view;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
return super.onCreateOptionsMenu(menu);
}
}`
数据库代码：'
package com.informatique.contacts;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.ArrayList;
import java.util.List;
public class MySQLiteHelper extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "contactsManager";
// Contacts table name
private static final String TABLE_CONTACTS = "contacts";
// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "nom";
private static final String KEY_PH_NO = "num";
private static final String KEY_EMAIL ="email";
private static final String KEY_ADRESS ="adresse";
public MySQLiteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_PH_NO + " TEXT,"
+ KEY_EMAIL + " TEXT,"
+ KEY_ADRESS + " TEXT" +")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);
// Create tables again
onCreate(db);
}
/**
* All CRUD(Create, Read, Update, Delete) Operations
*/
// Adding new contact
void addContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_ID, contact.get_id()); // Contact id
values.put(KEY_NAME, contact.get_nom()); // Contact Name
values.put(KEY_PH_NO, contact.get_num()); // Contact Phone
values.put(KEY_EMAIL, contact.get_email()); // Contact Email
values.put(KEY_ADRESS, contact.get_adresse()); //Contact Adress
// Inserting Row
db.insert(TABLE_CONTACTS, null, values);
db.close(); // Closing database connection
}
// Getting single contact
Contact getContact(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
KEY_NAME, KEY_PH_NO, KEY_EMAIL, KEY_ADRESS }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4));
// return contact
return contact;
}
// Getting All Contacts
public List<Contact> getAllContacts() {
List<Contact> contactList;
contactList = new ArrayList<Contact>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) do {
Contact contact = new Contact();
contact.set_id(Integer.parseInt(cursor.getString(0)));
contact.set_nom(cursor.getString(1));
contact.set_num(cursor.getString(2));
contact.set_email(cursor.getString(3));
contact.set_adresse(cursor.getString(4));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
// return contact list
return contactList;
}
// Updating single contact
public int updateContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.get_nom());
values.put(KEY_PH_NO, contact.get_num());
values.put(KEY_EMAIL, contact.get_email());
values.put(KEY_ADRESS, contact.get_adresse());
// updating row
return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
new String[] { String.valueOf(contact.get_id()) });
}
// Deleting single contact
public void deleteContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_CONTACTS, KEY_ID + " = ?",
new String[] { String.valueOf(contact.get_id()) });
db.close();
}
// Getting contacts Count
public int getContactsCount() {
String countQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
int count = cursor.getCount();
db.close();
cursor.close();
// return count
return count;
}
}`
错误消息路径 /data/data/ 在 FileNotFoundException 中看起来不正确。尝试从字符串当前DBPath中删除前导数据/