我是android的新手，我正在创建一个联系人管理器。我已经研究了如何将EditText字段中的值存储到数据库中，但我不知道如何在数据库中存储图像。我想知道是否有人可以帮助我。
package awad865.project.ContactManager1;
import java.io.FileNotFoundException;
import java.io.InputStream;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.database.SQLException;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Spinner;
public class AddContact extends Activity {
//declare private fields
private EditText firstName;
private EditText lastName;
private EditText number;
private EditText address;
private EditText date;
private EditText email;
private Spinner numberSpinner;
private Spinner emailSpinner;
private Spinner addressSpinner;
private Spinner dateSpinner;
private DatabaseHandler databaseHandler;
private ImageButton addPic;
private final int IMAGE_SELECTION =1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_contact);
//code that enables the title on the action bar
getActionBar().setDisplayShowTitleEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);
databaseHandler = new DatabaseHandler(this);
//intialise private fields
firstName = (EditText)findViewById(R.id.edit_first_name);
lastName = (EditText)findViewById(R.id.edit_last_name);
number = (EditText)findViewById(R.id.edit_number);
address = (EditText)findViewById(R.id.edit_address);
date = (EditText)findViewById(R.id.edit_date);
email =(EditText)findViewById(R.id.edit_email);
//Spinner for the phone number field
numberSpinner = (Spinner) findViewById(R.id.contact_number_spinner);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.number_array, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
numberSpinner.setAdapter(adapter);
//Spinner for the email address field
emailSpinner = (Spinner) findViewById(R.id.contact_email_spinner);
adapter = ArrayAdapter.createFromResource(this,
R.array.email_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
emailSpinner.setAdapter(adapter);
//Spinner for address field
addressSpinner = (Spinner) findViewById(R.id.contact_address_spinner);
adapter= ArrayAdapter.createFromResource(this,
R.array.address_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
addressSpinner.setAdapter(adapter);
//Spinner for date
dateSpinner = (Spinner) findViewById(R.id.contact_date_spinner);
adapter=ArrayAdapter.createFromResource(this,
R.array.date_array, android.R.layout.simple_spinner_dropdown_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dateSpinner.setAdapter(adapter);
addPic = (ImageButton) findViewById(R.id.addImage);
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.contacts_photo);
addPic.setImageBitmap(bm);
addPic.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent imageIntent = new Intent(Intent.ACTION_PICK);
imageIntent.setType("image/*");
startActivityForResult(imageIntent, IMAGE_SELECTION);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent){
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
switch(requestCode){
case IMAGE_SELECTION:
if(resultCode == RESULT_OK){
try{
BitmapFactory.Options options = new BitmapFactory.Options();
options.inScaled = true;
final Uri imageURI = imageReturnedIntent.getData();
final InputStream inStr = getContentResolver().openInputStream(imageURI);
final Bitmap selectImg = BitmapFactory.decodeStream(inStr, null, options);
addPic.setImageBitmap(selectImg);
}catch(FileNotFoundException ex){
Log.e("File not found", "Selected image was not found", ex);
}
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.add_contact, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item){
switch(item.getItemId()){
//if the save button is pressed, then all the information is retrieved from the EditText fields
//and stored in the private fields and then a new contact object is created and added to the
//database
case R.id.action_save:
//WANT to save the image here
BitmapDrawable bmd = ((BitmapDrawable) addPic.getDrawable());
Bitmap photo = bmd.getBitmap();
Contact contact = new Contact(firstName.getText().toString(),lastName.getText().toString(),number.getText().toString(), numberSpinner.getSelectedItem().toString(), email.getText().toString(), emailSpinner.getSelectedItem().toString(), date.getText().toString(), dateSpinner.getSelectedItem().toString(), address.getText().toString(), addressSpinner.getSelectedItem().toString(), "false");
//add to database
try {
databaseHandler.openDataBase();
databaseHandler.addContact(contact);
databaseHandler.close();
} catch (SQLException sqle) {
throw sqle;
}
//go back to list of contacts
Intent intentMain = new Intent(getApplicationContext(),MainActivity.class);
intentMain.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intentMain);
return true;
//if the cancel button is pressed on the action bar then the user is navigate to MainActivity
case R.id.action_cancel:
Intent intentCancel = new Intent(this,MainActivity.class);
intentCancel.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intentCancel);
return true;
//if the up button is pressed, then the user is taken back to the MainActivity
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
我的DatabaseHandler类：
package awad865.project.ContactManager1;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Blob;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.util.ByteArrayBuffer;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.graphics.Bitmap;
import android.util.Log;
public class DatabaseHandler extends SQLiteOpenHelper {
//declaring contants
private static String DB_NAME = "ContactsDb";
private static final int DB_VERSION = 1;
private static String DB_PATH = "/data/data/awad865.project.ContactManager1/databases/";
private final Context myContext;
private SQLiteDatabase myDataBase;
private static final String TABLE_CONTACT = "Contact";
private static final String FIRST_NAME = "firstname";
private static final String LAST_NAME = "lastname";
private static final String NUMBER = "number";
private static final String NUMBER_TYPE = "numbertype";
private static final String EMAIL = "email";
private static final String EMAIL_TYPE = "emailtype";
private static final String DATE = "date";
private static final String DATE_TYPE = "datetype";
private static final String ADDRESS = "address";
private static final String ADDRESS_TYPE = "addresstype";
private static final String IMAGE = "image";
private static final String FAVOURITE = "favourite";
//the parent constructor is called
public DatabaseHandler(Context context) {
super(context, DB_NAME, null, DB_VERSION);
this.myContext = context;
}
//method for creating the database
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(dbExist){
//copyDataBase();
}else{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException{
//Open your local database as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty database
String outFileName = DB_PATH + DB_NAME;
//Open the empty database as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
//method for adding a contact to the database
public void addContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
//put all the appropriate edit text fields contact and store them in the database.
values.put(FIRST_NAME, contact.getFirstName());
values.put(LAST_NAME, contact.getLastName());
values.put(NUMBER, contact.getNumber());
values.put(NUMBER_TYPE, contact.getNumberType());
values.put(EMAIL, contact.getEmail());
values.put(EMAIL_TYPE, contact.getEmailType());
values.put(ADDRESS, contact.getAddress());
values.put(ADDRESS_TYPE, contact.getAddressType());
values.put(DATE, contact.getDate());
values.put(DATE_TYPE, contact.getDateType());
values.put(FAVOURITE, "false");
db.insert(TABLE_CONTACT, null, values);
db.close(); // Closing database connection
}
// Deleting single contact
public void deleteContact(String firstName, String lastName) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_CONTACT,
FIRST_NAME + "=? AND " + LAST_NAME + "=?",
new String[] {firstName, lastName});
db.close();
}
//this method is used for editing a contact
public int updateContact(Contact contact, String firstName, String lastName) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
//we first find the existing contact, and overwrite the old
//values with the new values
values.put(FIRST_NAME, contact.getFirstName());
values.put(LAST_NAME, contact.getLastName());
values.put(NUMBER, contact.getNumber());
values.put(NUMBER_TYPE, contact.getNumberType());
values.put(EMAIL, contact.getEmail());
values.put(EMAIL_TYPE, contact.getEmailType());
values.put(ADDRESS, contact.getAddress());
values.put(ADDRESS_TYPE, contact.getAddressType());
values.put(DATE, contact.getDate());
values.put(DATE_TYPE, contact.getDateType());
values.put(FAVOURITE, contact.getFavourite());
// updating row
return db.update(TABLE_CONTACT, values, FIRST_NAME + "=? AND " + LAST_NAME + "=?",
new String[] {firstName, lastName});
}
public List<Contact> getFavouriteContacts() {
List<Contact> contactList = new ArrayList<Contact>();
String isFavourite = "true";
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_CONTACT + " WHERE " + FAVOURITE + "='" + isFavourite + "'";
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(cursor.getString(0),cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4), cursor.getString(5),cursor.getString(6), cursor.getString(7), cursor.getString(8), cursor.getString(9), cursor.getString(11));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
return contactList;
}
public Contact getContact(String firstName, String lastName) {
List<Contact> contactList = new ArrayList<Contact>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_CONTACT + " WHERE " + FIRST_NAME + "='" + firstName + "' AND " + LAST_NAME + "='" + lastName + "'";
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(cursor.getString(0),cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4), cursor.getString(5),cursor.getString(6), cursor.getString(7), cursor.getString(8), cursor.getString(9), cursor.getString(11));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
return contactList.get(0);
}
public List<Contact> getContacts(String order) {
List<Contact> contactList = new ArrayList<Contact>();
// Select All Query
//this bottom line is used to change the sorting order of the contact list
String selectQuery = "SELECT * FROM " + TABLE_CONTACT +" ORDER BY " + order;
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(cursor.getString(0),cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4), cursor.getString(5),cursor.getString(6), cursor.getString(7), cursor.getString(8), cursor.getString(9), cursor.getString(11));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
return contactList;
}
@Override
public void onCreate(SQLiteDatabase arg0) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
}
}
任何帮助将不胜感激。提前谢谢！
答案 0 :(得分：4)
最有可能你可以在你的数据库中使用BLOB，将图像转换为字节数组并存储在数据库中。
您还可以参考以下链接以获得公平而清晰的想法：
How to save images into Database
How to store image in SQLite database
how to store Image as blob in Sqlite & how to retrieve it?
how to store and retrieve images in android SQLite database and display them on a gridview
how to save and retrive images from sql lite database in android
Android How to save camera images in database and display another activity in list view?
答案 1 :(得分：1)
这是您在数据库中插入图片的代码。
db=new DBAdapter(this);
db.open();
byte[] img=Utilities.getBytes(BitmapFactory.decodeResource(getResources(), R.drawable.cute));
db.insert(img);
byte[] b=db.fetchSingle(1);
img1.setImageBitmap(Utilities.getImage(img));
db.close();
这是实用程序类
public class Utilities {
public static byte[] getBytes(Bitmap bitmap)
{
ByteArrayOutputStream stream=new ByteArrayOutputStream();
bitmap.compress(CompressFormat.JPEG,0, stream);
return stream.toByteArray();
}
public static Bitmap getImage(byte[] image)
{
return BitmapFactory.decodeByteArray(image, 0, image.length);
}
}