如何将存储在数据库中的图像作为字符串显示到真实图像?

问题描述 投票:2回答:1

如何检索存储在我的数据库中的图像作为真实图像,我已经使用两种不同的方法从数据库中获取图像,但没有一个适合我。

我有这个类,我正试图从listview中检索数据库中的图像。

在编译项目时,我收到以下内容:

resolveUri在坏位图uri上失败了

这是我的课程之一:

public class ListProp extends ListActivity {

private static final String TAG = ListProp.class.getSimpleName();
private static final String TAG_PHOTOS = "photoThumbnailUrl";
private SQLiteDatabase database;
private CursorAdapter dataSource;
Cursor cursor;
private static final String fields[] = { "photoThumbnailUrl",
        BaseColumns._ID };

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    DBHelper helper = new DBHelper(this);
    database = helper.getReadableDatabase();
    database = helper.getWritableDatabase();
    Cursor data = database.query(DBHelper.TABLE, fields, null, null, null,
            null, null);

    dataSource = new SimpleCursorAdapter(this, R.layout.image, data,
            fields, new int[] { R.id.image1 });

    setListAdapter(dataSource);
    System.out.println(dataSource);
    database.close();

    // selecting single ListView item
    final ListView lv = getListView();

    // Launching new screen on Selecting Single ListItem
    lv.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            System.out.println("I'm fine here");

            ImageView image = (ImageView) findViewById(R.id.image1);

            // get it as a ByteArray
            while (cursor.moveToFirst())
                ;
            byte[] imageByteArray = cursor.getBlob(cursor
                    .getColumnIndex(DBHelper.C_PHOTOS));

            // convert it back to an image
            ByteArrayInputStream imageStream = new    
                            ByteArrayInputStream(imageByteArray);
            Bitmap bitmap = BitmapFactory.decodeStream(imageStream);
            Drawable d = new BitmapDrawable(bitmap);
            image.setImageResource(R.drawable.ic_launcher);
            cursor.close();
            lv.addView(image);

        }

    });

}

}

android sql database image bitmap
1个回答
1
投票

请尝试以下教程:http://www.tutorialforandroid.com/2009/10/how-to-insert-image-data-to-sqlite.html

您将不得不使用BitmapFactory函数decodeByArray:

.setImageBitmap(BitmapFactory.decodeByteArray

希望这可以帮助

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