Android Studio如何获取SQLite数据并显示到ListView上(2)-木庄网络博客

首先将获取到的数据通过一个循环存放到map对象中

 for (int i = 0; i < list.size(); i++) {
      Map<String, Object> map = new HashMap<String, Object>();
      map.put("image", list.get(i).bitmap);
      map.put("category", list.get(i).content);
      map.put("money", list.get(i).data);
      listitem.add(map);
    }

    SimpleAdapter adapter = new SimpleAdapter(getActivity()
        , listitem
        , R.layout.fragment_one_item
        , new String[]{"category", "money", "image"}
        , new int[]{R.id.tv_expense_category, R.id.tv_expense_money, R.id.image_expense});
   
    ListView listView = (ListView) v.findViewById(R.id.lv_expense);
    listView.setAdapter(adapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {//设置监听器
      @Override
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Map<String, Object> map = (Map<String, Object>) parent.getItemAtPosition(position);
        Toast.makeText(getActivity(), map.get("category").toString(), Toast.LENGTH_LONG).show();
      }
    });

fragment_one_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <ImageView
    android:id="@+id/image_expense"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:paddingTop="10dp"
    android:paddingRight="10dp"
    android:paddingBottom="10dp"
    android:adjustViewBounds="true"
    android:maxWidth="72dp"
    android:maxHeight="72dp"/>
  <TextView
    android:id="@+id/tv_expense_category"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:padding="10dp"/>
  <TextView
    android:id="@+id/tv_expense_money"
    android:layout_width="wrap_content"
    android:layout_height="40dp"
    android:text="100yuan"/>
</LinearLayout>

此时我们已经将获取到的数据和ListView进行了绑定，我们可以直接运行，发现除了小照片不能显示外其他的信息都正常显示。这是由于SimpleAdapter 适配器默认使用显示的图片资源都是程序内的本地资源就是能通过R.drawable.–得到的，如果我们想要把从数据库中获得的Bitmap类型的图片显示到ListView中就要自己实现ViewBinder()这个接口，在里面定义数据和视图的匹配关系。

 for (int i = 0; i < list.size(); i++) {
      Map<String, Object> map = new HashMap<String, Object>();
      map.put("image_expense", list.get(i).bitmap);
      map.put("expense_category", list.get(i).content);
      map.put("expense_money", list.get(i).data);
      listitem.add(map);
    }
     SimpleAdapter adapter = new SimpleAdapter(getActivity()
        , listitem
        , R.layout.fragment_one_item
        , new String[]{"expense_category", "expense_money", "image_expense"}
        , new int[]{R.id.tv_expense_category, R.id.tv_expense_money, R.id.image_expense});
    adapter.setViewBinder(new SimpleAdapter.ViewBinder() {

      @Override
      public boolean setViewValue(View view, Object data,
                    String textRepresentation) {
        if ((view instanceof ImageView) & (data instanceof Bitmap)) {
          ImageView iv = (ImageView) view;
          Bitmap bm = (Bitmap) data;
          iv.setImageBitmap(bm);
          return true;
        }
        return false;
      }
    });
    ListView listView = (ListView) v.findViewById(R.id.lv_expense);
    listView.setAdapter(adapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {//设置监听器
      @Override
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Map<String, Object> map = (Map<String, Object>) parent.getItemAtPosition(position);
        Toast.makeText(getActivity(), map.get("expense_category").toString(), Toast.LENGTH_LONG).show();
      }
    });

此时照片资源也能正常显示了。

总结

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