Question

我从DB检索图像+文本并将其显示在gridview.i.e中。 gridview的每个项目由一个图像+一个text.It工作正常。但我只想知道如何在android中分别设置每个gridview项目的边框。我怎么能这样做？

我的代码是..

public class HomePage extends Activity  {
    private ArrayList<SingleElementDetails> allElementDetails=new ArrayList<SingleElementDetails>();
    DBAdapter db=new DBAdapter(this);
    String category, description;
    String data;
    String data1;
    GridView gridview;
    Button  menu;

        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.homepage);

        menu=(Button)findViewById(R.id.menus);

      menu.setOnClickListener(new OnClickListener(){
          public void onClick(View v)
          {
              gridview=(GridView)findViewById(R.id.gridview);
              TypedArray a = obtainStyledAttributes(R.styleable.Gallery);
               int mGalleryItemBackground = a.getResourceId(
                        R.styleable.Gallery1_android_galleryItemBackground, 0);
                a.recycle();


              allElementDetails.clear();
              db.open();
                long id;
                //id=db1.insertTitle1(category, description,r_photo);
                Cursor cursor = db.getAllTitles1();
                while (cursor.moveToNext())
                {
                    SingleElementDetails single=new SingleElementDetails();
                    single.setDishName(cursor.getString(1));
                    single.setCateogry(cursor.getString(2));
                    single.setDescription(cursor.getString(3));
                    single.setImage(cursor.getBlob(4));
                    allElementDetails.add(single);

                }
                db.close();
             CustomListAdapter adapter=new CustomListAdapter(HomePage.this,allElementDetails);
             gridview.setAdapter(adapter);
             gridview.setBackgroundResource(mGalleryItemBackground);



          }
      });
        }

}

我在这里使用CustomListAdapter存储来自DB的检索数据。我的CustomListAdapter代码是......

public class CustomListAdapter extends BaseAdapter {
    private  ArrayList<SingleElementDetails> allElementDetails;

    private LayoutInflater mInflater;

    public CustomListAdapter(Context context, ArrayList<SingleElementDetails> results) {
        allElementDetails = results;
        mInflater = LayoutInflater.from(context);
    }

    public int getCount() {
        return allElementDetails.size();        
    }

    public Object getItem(int position) {
        return allElementDetails.get(position);
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) 
    {
        convertView = mInflater.inflate(R.layout.listview1, null);
        ImageView imageview = (ImageView) convertView.findViewById(R.id.image);

        TextView textview1= (TextView) convertView.findViewById(R.id.dishname_entry);
        TextView textview2 = (TextView) convertView.findViewById(R.id.category_entry);
        TextView textview3=(TextView)convertView.findViewById(R.id.description_entry);
        textview1.setText(allElementDetails.get(position).getDishName());
        textview2.setText(allElementDetails.get(position).getCategory());

        if(allElementDetails.get(position).getDescription().length()>8)
            textview3.setText(allElementDetails.get(position).getDescription().substring(0,8)+"...");
        else
            textview3.setText(allElementDetails.get(position).getDescription());    

        byte[] byteimage=allElementDetails.get(position).getImage();
        ByteArrayInputStream imageStream = new ByteArrayInputStream(byteimage);
        BitmapFactory.Options op=new BitmapFactory.Options();
        op.inSampleSize=12;
        Bitmap theImage= BitmapFactory.decodeStream(imageStream,null,op);
        imageview.setImageBitmap(theImage);
        return convertView;
    }    

}

Answer 1

也许有一种更简单的方法，但可能会创建一个xml作为drawables中的drawable，内部定义的层就像这样：

每个drawable由单个元素内的元素表示。

文件位置：

res/drawable/filename.xml

文件名用作资源ID。

<?xml version="1.0" encoding="utf-8"?>
<layer-list
    xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
    <bitmap
        android:src="@drawable/rectangle" />
</item>
<item>
    <bitmap
        android:src="@drawable/griditem" />
</item>
<item>
    <nine-patch> other etc...
</item>
    <item> other drawable etc.</item>
</layer-list>

可以将它用作drawable或bitmap，如下所示：

Bitmap bitmap=BitmapFactory.decodeResource(getApplicationContext.getResources(),R.drawable.filename);

一些文档here

android中gridview项的边框

1 个答案: