假设我创建了一个自定义listView来显示“图像图标”，“标题”和“副标题”。并且该3 View的值将从sqlite数据库中查询。
这是我的main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bg_result"
android:focusable="true"
android:focusableInTouchMode="true"
android:orientation="vertical" >
<ListView
android:id="@+id/listView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:divider="#b5b5b5"
android:dividerHeight="1dp"
android:listSelector="@drawable/list_selector" />
</LinearLayout>
这是我的 custom.xml ，其中我设计了如何从我的ListView组织视图。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/list_selector"
android:orientation="horizontal"
android:padding="5dp" >
<!-- ListRow Left side image icon-->
<LinearLayout android:id="@+id/thumbnail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="3dip"
android:layout_alignParentLeft="true"
android:background="@drawable/image_bg"
android:layout_marginRight="5dip">
<ImageView
android:id="@+id/word_icon"
android:layout_width="50dip"
android:layout_height="50dip"
android:contentDescription="@string/descrip"
android:src="@drawable/word_icon_p"/>
</LinearLayout>
<!-- Title-->
<TextView
android:id="@+id/wordTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/thumbnail"
android:layout_toRightOf="@+id/thumbnail"
android:text="@string/sample"
android:textColor="#040404"
android:typeface="sans"
android:textSize="18sp"
android:textStyle="bold"
android:layout_marginTop="5dp"/>
<!-- Subtitle -->
<TextView
android:id="@+id/wordSub"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/wordTitle"
android:layout_below="@+id/wordTitle"
android:text="@string/sample"
android:textColor="#343434"
android:textSize="16sp" />
</RelativeLayout>
在我的 Sqlite数据库上，我有以下表和数据
--------------------------------------
= KEY_CODE = KEY_NAME = KEY_SUBTITLE = //My Table
--------------------------------------
= p = Sam_Tit1 = Sam_Sub1 = // This
= x = Sam_Tit2 = Sam_Sub2 = // is the
= n = Sam_Tit3 = Sam_Sub3 = // Data Value
======================================
所以，情节是，我想设置
的文本 -> wordTitle TextView is equal to KEY_NAME,
-> wordSub TextView is equal to KEY_SUBTITLE, and to set the background image of
-> word_icon ImageView is equal to KEY_CODE value
所以listView看起来像
====================================
= ListView =
====================================
= word_icon = wordTitle = wordSub =
====================================
= p.png = Sam_Tit1 = Sam_Sub1 =
= x.png = Sam_Tit2 = Sam_Sub2 =
= n.png = Sam_Tit3 = Sam_Sub3 =
====================================
现在，这是我的 MainActivity ，我将其命名为 AndroidListViewCursorAdaptorActivity.Java
public class AndroidListViewCursorAdaptorActivity extends Activity {
private CountriesDbAdapter dbHelper;
private SimpleCursorAdapter dataAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
dbHelper = new CountriesDbAdapter(this);
dbHelper.open();
displayListView(); // I call this function to set an Adapter for my ListView
}
private void displayListView() {
Cursor cursor = dbHelper.fetchAllCountries();
// The desired columns to be bound
String[] columns = new String[] { CountriesDbAdapter.KEY_NAME, CountriesDbAdapter.KEY_SUBTITLE };
// the XML defined views which the data will be bound to
int[] to = new int[] { R.id.wordTitle, R.id.wordSub };
// create the adapter using the cursor pointing to the desired data
// as well as the layout information
dataAdapter = new SimpleCursorAdapter(this, R.layout.custom,
cursor, columns, to, 0);
ListView listView = (ListView) findViewById(R.id.listView1);
// Assign adapter to ListView
listView.setAdapter(dataAdapter);
}
}
所以，一切都很好，所有工作都没有错误，我设置 WordTitle 和 WordSub 的文本并将其绑定到我的 ListView 。
现在，我的问题是我在设置 ImageView 的背景图像时遇到了一些麻烦，即 word_icon 。我想设置 word_icon 的背景图片
取决于 KEY_CODE 值。我已经知道如何做到这一点。
我尝试使用此代码更新 mainActivity 。
private CountriesDbAdapter dbHelper;
private SimpleCursorAdapter dataAdapter;
private ImageView im;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
dbHelper = new CountriesDbAdapter(this);
dbHelper.open();
displayListView(); // I call this function to set an Adapter for my ListView
}
private void displayListView() {
Cursor cursor = dbHelper.fetchAllCountries();
// The desired columns to be bound
String[] columns = new String[] {
CountriesDbAdapter.KEY_CODE, //Trying to fetch the KEY_CODE column
CountriesDbAdapter.KEY_NAME,
CountriesDbAdapter.KEY_SUBTITLE };
// the XML defined views which the data will be bound to
int[] to = new int[] {
R.id.word_icon, //Trying to Put it here
R.id.wordTitle,
R.id.wordSub };
// create the adapter using the cursor pointing to the desired data
// as well as the layout information
dataAdapter = new SimpleCursorAdapter(this, R.layout.custom,
cursor, columns, to, 0);
ListView listView = (ListView) findViewById(R.id.listView1);
// Assign adapter to ListView
listView.setAdapter(dataAdapter);
}
但没有运气，这段代码不起作用，正如我所料，因为我知道我需要设置背景图像，
im.setBackgroundImage(R.Drawable.something_image);
但我已经锁定了想法，需要有人帮助。
所以，就是这样，我希望有人可以帮助我。如果有的话，只要求澄清一下。
谢谢你！