我想将从图库或相机中选择的图像设置为ListView。选定的图像存储在sqlite db。
中以下是我的OnActivityResult类：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != RESULT_OK)
return;
if(resultCode == RESULT_OK) {
switch (requestCode) {
case CAMERA_REQUEST:
Bundle extras = data.getExtras();
if (extras != null) {
Bitmap yourImage = extras.getParcelable("data");
// convert bitmap to byte
ByteArrayOutputStream stream = new ByteArrayOutputStream();
yourImage.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte imageInByte[] = stream.toByteArray();
Log.e("outputbeforeconversion", imageInByte.toString());
// Inserting Contacts
Log.d("Insert: ", "Inserting ..");
db.addContact(new Contact("Android", imageInByte));
Intent i = new Intent(ForSaleAndRentUpload.this,
ForSaleAndRentUpload.class);
startActivity(i);
finish();
}
break;
case PICK_FROM_GALLERY:
Bundle extras2 = data.getExtras();
if (extras2 != null) {
Bitmap yourImage = extras2.getParcelable("data");
// convert bitmap to byte
ByteArrayOutputStream stream = new ByteArrayOutputStream();
yourImage.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte imageInByte[] = stream.toByteArray();
Log.e("outputbeforeconversion", imageInByte.toString());
// Inserting Contacts
Log.d("Insert: ", "Inserting ..");
db.addContact(new Contact("Android", imageInByte));
Intent i = new Intent(ForSaleAndRentUpload.this,
ForSaleAndRentUpload.class);
startActivity(i);
finish();
}
break;
}
}
}
我有这个对话框帮助我选择直接从图库或相机中选择。当我选择从任何选项中选择图像时，我会进行相同的活动，但ListView为空。
适配器：
public class ContactImageAdapter extends ArrayAdapter<Contact> {
Context context;
int layoutResourceId;
// BcardImage data[] = null;
ArrayList<Contact> data=new ArrayList<Contact>();
public ContactImageAdapter(Context context, int layoutResourceId, ArrayList<Contact> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ImageHolder holder = null;
if(row == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new ImageHolder();
holder.txtTitle = (TextView)row.findViewById(R.id.textInvi);
holder.imgIcon = (ImageView)row.findViewById(R.id.listImageItem);
row.setTag(holder);
}
else
{
holder = (ImageHolder)row.getTag();
}
Contact picture = data.get(position);
holder.txtTitle.setText(picture._name);
//convert byte to bitmap take from contact class
byte[] outImage=picture._image;
ByteArrayInputStream imageStream = new ByteArrayInputStream(outImage);
Bitmap theImage = BitmapFactory.decodeStream(imageStream);
holder.imgIcon.setImageBitmap(theImage);
return row;
}
static class ImageHolder
{
ImageView imgIcon;
TextView txtTitle;
}
}
存储图像的数据库：
public class DataBaseHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "imagedb";
private static final String TABLE_CONTACTS = "contacts";
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_IMAGE = "image";
public DataBaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_IMAGE + " BLOB" + ")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
@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);
}
public void addContact(Contact contact){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact._name); // Contact Name
values.put(KEY_IMAGE, contact._image); // Contact Phone
// Inserting Row
db.insert(TABLE_CONTACTS, null, values);
db.close(); // Closing database connection
}
Contact getContact(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
KEY_NAME, KEY_IMAGE }, 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.getBlob(2));
// return contact
return contact;
}
// Getting All Contacts
public List<Contact> getAllContacts() {
List<Contact> contactList = new ArrayList<Contact>();
// Select All Query
String selectQuery = "SELECT * FROM contacts ORDER BY name";
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.setID(Integer.parseInt(cursor.getString(0)));
contact.setName(cursor.getString(1));
contact.setImage(cursor.getBlob(2));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
// close inserting data from database
db.close();
// 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.getName());
values.put(KEY_IMAGE, contact.getImage());
// updating row
return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
new String[] { String.valueOf(contact.getID()) });
}
// Deleting single contact
public void deleteContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_CONTACTS, KEY_ID + " = ?",
new String[] { String.valueOf(contact.getID()) });
db.close();
}
// Getting contacts Count
public int getContactsCount() {
String countQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
选择图像时记录：
03-11 07:00:45.622 1773-1773/com.iwillcode.realestate E/Selected Item﹕ 1
03-11 07:00:46.507 1773-1773/com.iwillcode.realestate W/IInputConnectionWrapper﹕ showStatusIcon on inactive InputConnection
03-11 07:00:47.476 1773-1796/com.iwillcode.realestate W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-11 07:00:47.477 1773-1796/com.iwillcode.realestate W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa3a76c00, error=EGL_SUCCESS
03-11 07:00:51.252 1773-1796/com.iwillcode.realestate W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-11 07:00:51.252 1773-1796/com.iwillcode.realestate W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa373b080, error=EGL_SUCCESS
03-11 07:00:52.710 1773-1773/com.iwillcode.realestate E/Selected Item﹕ 1
03-11 07:00:53.667 1773-1773/com.iwillcode.realestate W/IInputConnectionWrapper﹕ showStatusIcon on inactive InputConnection
03-11 07:00:54.456 1773-1796/com.iwillcode.realestate W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-11 07:00:54.456 1773-1796/com.iwillcode.realestate W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa3a76c00, error=EGL_SUCCESS
答案 0 :(得分：0)
工作代码（主要活动）
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CameraActivity = this;
imageView = (ListView) findViewById(R.id.image_view);
database = new ImageDatabase(this);
//Set OnClick Listener to button view
captureImage = (Button) findViewById(R.id.capture_image);
captureImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
isStoragePermissionGranted();
}
});
//long press on image
imageView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
isStoragePermissionGranted();
return true;
}
});
}
private void startDialog() {
AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(
CameraActivity);
myAlertDialog.setTitle("Upload Pictures Option");
myAlertDialog.setMessage("How do you want to set your picture?");
myAlertDialog.setPositiveButton("Gallery",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
Intent i = new Intent();
i.setType("image/*");
i.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(i.createChooser(i, "Result load Image")
, GALLERY_IMAGE);
}
});
myAlertDialog.setNegativeButton("Camera",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
});
myAlertDialog.show();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
//Code for @CAMERA_REQUEST
if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) {
theImage = (Bitmap) data.getExtras().get("data");
}
//Code for @GALLERY_IMAGE
if (requestCode == GALLERY_IMAGE && resultCode == RESULT_OK) {
try {
Uri imageUri = data.getData();
InputStream imageStream = getContentResolver().openInputStream(imageUri);
theImage = BitmapFactory.decodeStream(imageStream);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
ByteArrayOutputStream stream = new ByteArrayOutputStream();
theImage.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
SQLiteDatabase db = database.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(ImageDatabase.KEY_IMG_URL, byteArray);
db.insert(ImageDatabase.TABLE_NAME, null, values);
//db.update(ImageDatabase.TABLE_NAME, values, null, null);
db.close();
}
public void getTheImage() {
SQLiteDatabase db = database.getReadableDatabase();
Cursor cursor = (Cursor) db.rawQuery(" SELECT * FROM " + ImageDatabase.TABLE_NAME,
null, null);
if (cursor.moveToFirst()) {
byte[] imgByte = cursor.getBlob(cursor.getColumnIndex(ImageDatabase.KEY_IMG_URL));
//cursor.close();
b = BitmapFactory.decodeByteArray(imgByte, 0, imgByte.length);
}
//if (cursor != null && !cursor.isClosed()) {
// cursor.close();
//}
mImageAdapter = new ImageAdapter(this,cursor);
imageView.setAdapter(mImageAdapter);
}
//Storage permission
public boolean isStoragePermissionGranted() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
== PackageManager.PERMISSION_GRANTED) {
Log.v(TAG, "Permission is granted");
startDialog();
return true;
} else {
Log.v(TAG, "Permission is revoked");
ActivityCompat.requestPermissions(this, new String[]
{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
return false;
}
} else { //permission is automatically granted on sdk<23 upon installation
Log.v(TAG, "Permission is granted");
startDialog();
return true;
}
}
@Override
protected void onStart() {
super.onStart();
getTheImage();
}
}
图像适配器
public class ImageAdapter extends CursorAdapter {
public ImageAdapter(Context context, Cursor c) {
super(context, c, 0);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// Inflate a list item view using the layout specified in list_item.xml
return LayoutInflater.from(context).inflate(R.layout.list_item,parent, false);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
// Find individual views that we want to modify in the list item layout
ImageView imageView = (ImageView) view.findViewById(R.id.image);
byte[] imgByte = cursor.getBlob(cursor.getColumnIndex(ImageDatabase.KEY_IMG_URL));
Bitmap b = BitmapFactory.decodeByteArray(imgByte, 0, imgByte.length);
imageView.setImageBitmap(b);
}
}
数据库类
公共类ImageDatabase扩展了SQLiteOpenHelper { 公共上下文上下文；
//Database name
public static final String DATABASE_NAME = "imageData";
//Version
public static final int DATABASE_VERSION = 1;
//SQL Table detail;
public static final String TABLE_NAME = "DATA";
public static final String KEY_ID = "_id";
public static final String KEY_IMG_URL = "imagedisplayed";
public ImageDatabase(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context = context;
//Toast.makeText(context, "Constructor called", Toast.LENGTH_LONG).show();
}
public static final String CREATE_TABLE = "CREATE TABLE " + TABLE_NAME + "(" + KEY_ID +
" INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_IMG_URL + " BLOB " + ")";
public static final String DROP_TABLE = "DROP TABLE IF EXISTS " + TABLE_NAME + "";
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(DROP_TABLE);
onCreate(db);
}
public void deleteEntry(long row) {
SQLiteDatabase sqLiteDatabase = getWritableDatabase();
sqLiteDatabase.delete(TABLE_NAME, KEY_ID + "=" + row, null);
}
}
别忘了在清单中提及用户权限代码。