如何将图像从 Drawable 加载到 SimpleCursorAdapter

Question

我在该适配器中使用 Simple Cursor Adapter 创建一个列表视图我现在获取我的 Sqlite 列名称我想从 Drawable 文件夹中将图像添加到同一个适配器我们如何做到这一点给出想法和建议谢谢..

这是我的代码：

    protected void onCreate(Bundle savedInstanceState) {
           final int[] imageResource =new int[] {R.drawable.juice, R.drawable.medicinebowl, R.drawable.kam};
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            listView= (ListView) findViewById(R.id.listView);
     dbHelper = new SqlLiteDbHelper(this);
            try {
                dbHelper.openDataBase();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            sqLiteDatabase = dbHelper.getReadableDatabase();
            cursor = dbHelper.gettitles(sqLiteDatabase);
            String[] from = new String[]{dbHelper.TITLE, String.valueOf(circle)};
    int[] to = new int[]{R.id.title,R.id.circle};
            SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.title_row, cursor, from, to);
            adapter.notifyDataSetChanged();

            listView.setAdapter(adapter);

Answer 1

为此，您需要自己的自定义布局并覆盖setViewBinder 方法，下面是一个可以帮助您理解的示例，

YourClass.java

// The desired columns to be bound
    String[] columns = new String[] { DBHelper.KEY_IMAGE_TYPE, DBHelper.KEY_HOUSE,
            DBHelper.KEY_PRICE };

    // the XML defined views which the data will be bound to
    int[] to = new int[] {  
            R.id.icon,
            R.id.bowler_txt};

    SimpleCursorAdapter dataAdapter = new SimpleCursorAdapter(this,
            R.layout.listrow, cursor, columns, to, 0);
    dataAdapter.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
        @Override
        public boolean setViewValue(View view, Cursor cursor,
                int columnIndex) {
            switch (view.getId()) {
            case R.id.image:
                int imageType = cursor.getInt(columnIndex);
                int imageToBeShown=0;
                switch (imageType) {
                case TYPE_ONE:
                    imageToBeShown=imgs[0];
                    break;
                case TYPE_TWO:
                    imageToBeShown=imgs[1];
                    break;
                case TYPE_THREE:
                    imageToBeShown=imgs[2];
                    break;
                case TYPE_FOUR:
                    imageToBeShown=imgs[3];
                    break;
                case TYPE_FIVE:
                    imageToBeShown=imgs[4];
                    break;
                case TYPE_SIX:
                    imageToBeShown=imgs[5];
                    break;
                }
                ((ImageView)view).setImageResource(imageToBeShown);
                return true;
            }
            return false;
        }
    });

listrow.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">

<ImageView
    android:id="@+id/icon"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/bowler_txt"
    android:paddingLeft="25dp"
    android:textSize="30dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Bowler"
    android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

Answer 2

我觉得你可以用这个方法

int[] imageResource = {R.drawable.image_1, R.drawable.image_2, R.drawable.image_3};

并将其传递给您的 SimpleCursorAdapter 构造函数。

Answer 3

你可以简单地通过添加这一行来做到这一点

your_imageview.setImageResource(R.drawable.drwable_image);

如果您还没有创建扩展 SimpleCursorAdapter 的自定义适配器，您可以这样做

  String[] columns = new String[] { People.NAME, People.NUMBER };
int[] to = new int[] { R.id.name_entry, R.id.number_entry };

SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, R.layout.list_example_entry, cursor, columns, to);

colomns 数组应包含日期，to 数组应包含您要为其分配数据的对象的 id

这用于图像

    listAdapter.setViewBinder(new SimpleCursorAdapter.ViewBinder(){

   public boolean setViewValue(View view, Cursor cursor, int columnIndex){
       if(view.getId() == R.id.your_image_view_id){
          int imageType = cursor.getInt(columnIndex);
            int imageToBeShown=0;
            switch (imageType) {
            case TYPE_ONE:
                imageToBeShown=imgs[0];
                break;
            case TYPE_TWO:
                imageToBeShown=imgs[1];
                break;
            case TYPE_THREE:
                imageToBeShown=imgs[2];
                break;
            case TYPE_FOUR:
                imageToBeShown=imgs[3];
                break;
            case TYPE_FIVE:
                imageToBeShown=imgs[4];
                break;
            case TYPE_SIX:
                imageToBeShown=imgs[5];
                break;
            }
            ((ImageView)view).setImageResource(imageToBeShown);

           return true; //true because the data was bound to the view
       }
       return false;
   }
});

设置图片资源应该取决于你的行类型