Question

我按照一个很好的教程，进行了一些更改，创建了一个自定义ListView，允许我为ListView中的每一行显示多个图像。我想要做的是通过选择列表中的多个项目来突出显示，然后通过在我的选项菜单上选择一个选项，对所有这些列表项执行某种操作。但是，我似乎遇到的问题是我无法选择多个项目，即使我已将android:choiceMode="multipleChoice"添加到.xml文件中的ListView。我意识到这可以使用复选框或单选按钮完成，但我宁愿避免这种情况。我在下面附上了我的源代码。任何帮助，将不胜感激。最后，感谢http://custom-android-dn.blogspot.com/提供了一个很棒的教程。感谢。

CustomlistviewActivity.java

package DucNguyen.example.customlistview;

public class CustomlistviewActivity extends Activity {

    private ListView listViewFootballLegend;
    private Context ctx;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_customlistview);        
        ctx=this;   
        List<FootballLegend> legendList= new ArrayList<FootballLegend>();
        legendList.add(new FootballLegend("Pele","October 23, 1940 (age 72)","pele","brazil"));
        legendList.add(new FootballLegend("Diego Maradona","October 30, 1960 (age 52)","maradona","argentina"));
        legendList.add(new FootballLegend("Johan Cruyff","April 25, 1947 (age 65)","cruyff","netherlands"));
        legendList.add(new FootballLegend("Franz Beckenbauer","September 11, 1945 (age 67)","beckenbauer","germany"));
        legendList.add(new FootballLegend("Michel Platini","June 21, 1955 (age 57)","platini","france"));
        legendList.add(new FootballLegend("Ronaldo De Lima","September 22, 1976 (age 36)","ronaldo","brazil"));

        listViewFootballLegend = ( ListView ) findViewById( R.id.FootballLegend_list);
        listViewFootballLegend.setAdapter( new FootballLegendListAdapter(ctx, R.layout.legend_row_item, legendList ) );

        // Click event for single list row
        listViewFootballLegend.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                FootballLegend o = (FootballLegend) parent.getItemAtPosition(position);  
                Toast.makeText(CustomlistviewActivity.this, o.getName().toString(), Toast.LENGTH_SHORT).show();
            }
        });     
    } 
}

FootballLegendListAdapter.java

package DucNguyen.example.customlistview;

public class FootballLegendListAdapter extends ArrayAdapter<FootballLegend> {
    private int             resource;
    private LayoutInflater  inflater;
    private Context         context;
    public FootballLegendListAdapter ( Context ctx, int resourceId, List<FootballLegend> objects) {
        super( ctx, resourceId, objects );
        resource = resourceId;
        inflater = LayoutInflater.from( ctx );
        context=ctx;
    }
    @Override
    public View getView ( int position, View convertView, ViewGroup parent ) { 
        convertView = ( RelativeLayout ) inflater.inflate( resource, null ); 
        FootballLegend Legend = getItem( position );
                TextView legendName = (TextView) convertView.findViewById(R.id.legendName);
        legendName.setText(Legend.getName());

        TextView legendBorn = (TextView) convertView.findViewById(R.id.legendBorn);
        legendBorn.setText(Legend.getNick());

        ImageView legendImage = (ImageView) convertView.findViewById(R.id.legendImage);
        String uri = "drawable/" + Legend.getImage();
        int imageResource = context.getResources().getIdentifier(uri, null, context.getPackageName());
        Drawable image = context.getResources().getDrawable(imageResource);
        legendImage.setImageDrawable(image);

        ImageView NationImage = (ImageView) convertView.findViewById(R.id.Nation);
        uri = "drawable/" + Legend.getNation();
        imageResource = context.getResources().getIdentifier(uri, null, context.getPackageName());
        image = context.getResources().getDrawable(imageResource);
        NationImage.setImageDrawable(image);

        return convertView;
    }
}

FootballLegend.java

package DucNguyen.example.customlistview;
public class FootballLegend {
    public FootballLegend(String name, String born, String image, String nation) {
        super();
        this.name = name;
        this.born = born;
        this.image = image;
        this.nation = nation;
    }
    private String name;
    private String born;
    private String image;
    private String nation;

    public String getName() {
        return name;
    }
    public void setName(String nameText) {
        name = nameText;
    }
    public String getNick() {
        return born;
    }
    public void setNick(String born) {
        this.born = born;
    }
    public String getImage() {
        return image;
    }
    public void setImage(String image) {
        this.image = image;
    }
        public String getNation() {
        return nation;
    }
    public void setNation(String image) {
        this.image = nation;
    }
}

legend_row_item.xml

<?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:orientation="horizontal"
    android:padding="5dip" >

    <!--  ListRow Left side Thumbnail image -->
    <LinearLayout android:id="@+id/thumbnail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="3dip"
        android:layout_alignParentLeft="true"
        android:layout_marginRight="5dip"> 
        <ImageView
            android:id="@+id/legendImage"
            android:layout_width="50dip"
            android:layout_height="50dip" /> 
    </LinearLayout>

    <TextView
        android:id="@+id/legendName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/thumbnail"
        android:layout_toRightOf="@+id/thumbnail"
        android:textColor="#040404"
        android:typeface="sans"
        android:textSize="15dip"
        android:textStyle="bold"/>

    <TextView
        android:id="@+id/legendBorn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/legendName"
        android:textColor="#343434"
        android:textSize="10dip"
        android:layout_marginTop="1dip"
        android:layout_toRightOf="@+id/thumbnail"  />

    <ImageView
        android:id="@+id/Nation"
        android:layout_width="45dp"
        android:layout_height="30dp"
        android:layout_alignParentRight="true"
        android:layout_marginRight="5dp"
        android:layout_centerVertical="true" />

</RelativeLayout>

activity_customlistview.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:orientation="vertical" >

    <ListView
        android:id="@+id/FootballLegend_list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:paddingTop="5dp"
        android:choiceMode="multipleChoice" >
    </ListView>

</LinearLayout>

Answer 1

您将在列表中显示的每个项目的根View必须实现Checkable。实现此接口时，还会更新View的可绘制状态。有关如何执行此操作，请参阅this answer。
将<selector> drawable设置为此根View的背景。检查状态和正常状态有哪些不同的颜色/可绘制。
将ListView的选择模式设为单选或多选。
在列表适配器中，使用上面创建的View作为父布局提供项目视图。

现在，ListView将负责在其项目视图中设置已选中/未选中状态。您也可以致电getCheckedItemIds()上的getCheckedItemPositions()或ListView来获取当前所选的项目。

使用自定义适配器选择/突出显示列表视图中的多个项目 - Android

1 个答案: