我的imageview没有填充我选择的图片。请帮助
DBHelper
public class DBHelper {
public static final String IMAGE_ID = "id";
public static final String IMAGE = "image";
private final Context mContext;
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
private static final String DATABASE_NAME = "Images.db";
private static final int DATABASE_VERSION = 1;
private static final String IMAGES_TABLE = "ImagesTable";
private static final String CREATE_IMAGES_TABLE =
"CREATE TABLE " + IMAGES_TABLE + " (" +
IMAGE_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ IMAGE + " BLOB NOT NULL );";
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_IMAGES_TABLE);
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + CREATE_IMAGES_TABLE);
onCreate(db);
}
}
public void Reset() {
mDbHelper.onUpgrade(this.mDb, 1, 1);
}
public DBHelper(Context ctx) {
mContext = ctx;
mDbHelper = new DatabaseHelper(mContext);
}
public DBHelper open() throws SQLException {
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
mDbHelper.close();
}
// Insert the image to the Sqlite DB
public void insertImage(byte[] imageBytes) {
ContentValues cv = new ContentValues();
cv.put(IMAGE, imageBytes);
mDb.insert(IMAGES_TABLE, null, cv);
}
// Get the image from SQLite DB
// We will just get the last image we just saved for convenience...
public byte[] retreiveImageFromDB() {
Cursor cur = mDb.query(true, IMAGES_TABLE, new String[]{IMAGE,},
null, null, null, null,
IMAGE_ID + " DESC", "1");
if (cur.moveToFirst()) {
byte[] blob = cur.getBlob(cur.getColumnIndex(IMAGE));
cur.close();
return blob;
}
cur.close();
return null;
}
}
ImageFragment
public class ImageFragment extends Fragment {
private FloatingActionButton floatingActionButton;
private RecyclerView recyclerView;
private TextView textView;
private static int RESULT_LOAD_IMAGE = 1;
private static int RESULT_CAPTURE_IMAGE = 2;
TaskCursorImageAdapter myListCursorAdapter;
public Uri mCurrentTaskUri;
DBHelper dbHelper;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_image, container, false);
floatingActionButton = (FloatingActionButton) view.findViewById(R.id.fragmentimagefloatingactionbutton);
recyclerView = (RecyclerView) view.findViewById(R.id.fragmentimagerecyclerview);
textView = (TextView) view.findViewById(R.id.fragmentimagetextview);
dbHelper = new DBHelper(getActivity());
myListCursorAdapter = new TaskCursorImageAdapter(getActivity(), null);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(myListCursorAdapter);
floatingActionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
PopupMenu popup = new PopupMenu(getActivity(), floatingActionButton);
//Inflating the Popup using xml file
popup.getMenuInflater().inflate(R.menu.popup_menu, popup.getMenu());
//registering popup with OnMenuItemClickListener
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
if(item.getItemId()==R.id.takephoto){
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
File file = new File(Environment.getExternalStorageDirectory()+File.separator + "img.jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
startActivityForResult(intent, RESULT_CAPTURE_IMAGE);
}else if(item.getItemId()==R.id.chooseimage){
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), RESULT_LOAD_IMAGE);
}
return true;
}
});
popup.show();//showing popup menu
}
});
return view;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImageUri = data.getData();
if (null != selectedImageUri) {
// Saving to Database...
if (saveImageInDB(selectedImageUri)) {
Toast.makeText(getActivity(),"Image Saved in Database...",Toast.LENGTH_LONG).show();
mCurrentTaskUri=selectedImageUri;
}
// Reading from Database after 3 seconds just to show the message
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
if (loadImageFromDB()) {
Toast.makeText(getActivity(),"Image Loaded from Database...",Toast.LENGTH_LONG).show();
}
}
}, 3000);
}
}
if (requestCode == RESULT_CAPTURE_IMAGE && resultCode == RESULT_OK && null != data) {
File file = new File(Environment.getExternalStorageDirectory() + File.separator + "img.jpg");
}
super.onActivityResult(requestCode, resultCode, data);
}
Boolean saveImageInDB(Uri selectedImageUri) {
try {
dbHelper.open();
InputStream iStream = getActivity().getContentResolver().openInputStream(selectedImageUri);
byte[] inputData = Utils.getBytes(iStream);
dbHelper.insertImage(inputData);
dbHelper.close();
return true;
} catch (IOException ioe) {
Log.e(TAG, "<saveImageInDB> Error : " + ioe.getLocalizedMessage());
dbHelper.close();
return false;
}
}
Boolean loadImageFromDB() {
try {
dbHelper.open();
byte[] bytes = dbHelper.retreiveImageFromDB();
dbHelper.close();
// Show Image from DB in ImageView
return true;
} catch (Exception e) {
Log.e(TAG, "<loadImageFromDB> Error : " + e.getLocalizedMessage());
dbHelper.close();
return false;
}
}
}
TaskCursorImageAdapter
public class TaskCursorImageAdapter extends RecyclerCursorAdapter<TaskCursorImageAdapter.ViewHolder> {
Context context;
Cursor cursor;
public TaskCursorImageAdapter(Context context, Cursor cursor){
super(context,cursor);
this.cursor=cursor;
this.context=context;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
Context context;
Cursor cursor;
public ViewHolder(View view, Context context, Cursor cursor) {
super(view);
this.context = context;
this.cursor = cursor;
imageView=(ImageView) view.findViewById(R.id.listitemimageview);
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater=LayoutInflater.from(parent.getContext());
View view= layoutInflater.inflate(R.layout.list_item_images,parent,false);
return new ViewHolder(view,context,cursor);
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, Cursor cursor) {
/* int taskColumnIndex=cursor.getColumnIndex(TaskContract.TaskEntry.NAME_IMAGES);
String task=cursor.getString(taskColumnIndex);
viewHolder.cursor = cursor;
Picasso.with(context).load(task).into(viewHolder.imageView);*/
DBHelper dbHelper= new DBHelper(context);
byte[] bytes = dbHelper.retreiveImageFromDB();
dbHelper.close();
// Show Image from DB in ImageView
ImageFragment imageFragment=new ImageFragment();
// viewHolder.imageView.setImageURI(imageFragment.mCurrentTaskUri);
viewHolder.imageView.setImageBitmap(Utils.getImage(bytes));
Toast.makeText(context,"Pritish",Toast.LENGTH_LONG).show();
}
}
的Utils
public class Utils {
public static byte[] getImageBytes(Bitmap bitmap) {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
return stream.toByteArray();
}
public static Bitmap getImage(byte[] image) {
return BitmapFactory.decodeByteArray(image, 0, image.length);
}
public static byte[] getBytes(InputStream inputStream) throws IOException {
ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
byteBuffer.write(buffer, 0, len);
}
return byteBuffer.toByteArray();
}
}
我的mainactivity中有一个带有图像选项的导航抽屉，点击它后，它会打开ImageFragment，它有一个浮动按钮＆amp;单击它会显示一个弹出菜单，显示是否拍摄图像或浏览用户手机的图像。当我浏览手机并选择图像时，图像存储在sqlite中，但不会显示在imageview中