Android图库视图,图像以sqlite格式保存为blob

时间:2012-02-20 07:14:54

标签: java android

我需要将sqlite数据库中的图像显示到gridview或图库视图中 这是在单个视图上显示的代码:

mMain = (ImageView) findViewById(R.id.ivMain);
byte[] blob = imgs.getBytes(); //there is a method that will return the bytes from the database
ByteArrayInputStream inputStream = new ByteArrayInputStream(blob);
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
mMain.setImageBitmap(bitmap);

我有网格视图的android教程,但它从文件中获取图像

// references to our images
private Integer[] mThumbIds = {
R.drawable.sample_2, R.drawable.sample_3
... }

有没有办法从sqlite数据库填充gridview?

更新
我在Android教程中使用ImageAdapter提供:
http://developer.android.com/resources/tutorials/views/hello-gridview.html
我的代码变成了这个:

ArrayList<byte[]> image_arr = new ArrayList<byte[]>();
//loop through all images on sqlite
for(int l = 0 ;l< db.getAllImages().size(); l++){
    Image imgs = db.getAllImages().get(l); 
    byte[] blob = imgs.getBytes();  
    image_arr.add(blob);

    ByteArrayInputStream inputStream = new ByteArrayInputStream(blob);
    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
   // mMain.setImageBitmap(bitmap);
}
//TODO; find way to make the bitmap get to the ImageView

Gallery gallery = (Gallery) findViewById(R.id.gallery);
gallery.setAdapter(new ImageAdapter(this));

此代码在主要活动上,因此我需要找到传递ImageView中其他文件中的资源的方法。

1 个答案:

答案 0 :(得分:0)

private void getDataAndPopulate() {

    image = new ArrayList<byte[]>();
    caption = new ArrayList<String>();

    cursor=db.rawQuery("select * from NAME",null);


    while (cursor.moveToNext()) {

        byte[] temp_image = cursor.getBlob(2);
        String temp_caption = cursor.getString(1);
        String temp_id= cursor.getString(0);
        image.add(temp_image);
        caption.add(temp_caption);
        id.add(temp_id);
    }
    String[] captionArray = (String[]) caption.toArray(
            new String[caption.size()]);

    ItemsAdapter itemsAdapter = new ItemsAdapter(Item_show_grid.this, R.layout.item_grid,captionArray);
    gv.setAdapter(itemsAdapter);

}