Question

我正在使用GridView并且其中包含很多项目。这是我的gridview.xml文件

 <?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"
    android:orientation="vertical" >

<GridView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/gridview"
    android:numColumns="auto_fit"
    android:horizontalSpacing="5dp"
    android:verticalSpacing="5dp"
    android:layout_margin="5dp"
    android:background="#FF8040"
    android:clickable="true"/>
</LinearLayout>

这是gridview_layout.xml文件，其中包含要在gridview中显示的元素..

    <?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"
    android:orientation="vertical"
    android:padding="5dp"
    android:background="#FFFFFF">


   <RelativeLayout 
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:id="@+id/rel1">

    <ImageView 
            android:id="@+id/flag"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:padding="10dp"/>


    <TextView 
            android:id="@+id/txt"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textSize="15dp"
            android:gravity="center_horizontal" 
            android:layout_below="@+id/flag"/>

    <RatingBar 
        android:id="@+id/rting1"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:layout_below="@+id/txt"
        android:numStars="5" 
        style="@style/foodRatingBar"/>

    <LinearLayout 
        android:layout_height="fill_parent"
        android:layout_width="fill_parent"
        android:orientation="horizontal"
        android:layout_below="@+id/rting1"
        android:weightSum="2">

        <Button 
            android:layout_width="0dp"
            android:layout_height="24dp"
            android:id="@+id/btnn1"
            android:text="Details"
            android:background="#A0A0A0"
            android:layout_marginLeft="3dp"
            android:layout_weight="1"
            android:gravity="center"/>
        <Button 
            android:layout_width="0dp"
            android:layout_height="24dp"
            android:id="@+id/btnn2"
            android:text="Enquiry" 
            android:background="#A0A0A0"
            android:layout_marginLeft="3dp"
            android:layout_weight="1"/>
    </LinearLayout>

    </RelativeLayout>


</LinearLayout>

我正在使用标准的OnItemClickListner（），但这不起作用。 logCat中没有错误。下面是我的GridViewActivity ..

    public class GridViewActivity extends Activity{

    GridView gridView;
    Context context;
    ArrayList itemName;
    Button btn11;

    public static String [] web={"Butterfly Valve","Globe Valve","Piston Valve","Forged Globe Valve","Swing Non Return Valve","Wafer Non Return Valve","Diapgragm Valve","Three Way Ball Valve","Pp And Pvc Ball Valve",
        "Forged Ball Valve","Wafer Ball Valve","Pocket Less Ball Valve","Knife Edge Gate Valve"};

    public static int [] imageId={R.drawable.image1,
        R.drawable.image1,
        R.drawable.image1,
        R.drawable.image1,
        R.drawable.image1,
        R.drawable.image1,
        R.drawable.image1,
        R.drawable.image1,
        R.drawable.image1,
        R.drawable.image1}; 

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.gridview);
        CustomGrid adapter = new CustomGrid(GridViewActivity.this, web, imageId);
        gridView = (GridView)findViewById(R.id.gridview);
        gridView.setAdapter(adapter);

        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // TODO Auto-generated method stub
                Toast.makeText(GridViewActivity.this, "you clicked at..." +web[ + position], Toast.LENGTH_LONG).show();

            }
        });

    }
}

最后这是我的CustomGrid适配器类： -

    public class CustomGrid extends BaseAdapter{

    private Context mContext;
    private final String[] web;
    private final int[] imageId;


    public CustomGrid(Context c,String[] web,int[] imageId ) {
        mContext = c;
        this.imageId = imageId;
        this.web = web;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return web.length;
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        View grid;
        LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if(convertView == null){
            grid = new View(mContext);

            grid = inflater.inflate(R.layout.gridview_layout, null);
            TextView textview = (TextView)grid.findViewById(R.id.txt);
            ImageView imageview = (ImageView)grid.findViewById(R.id.flag);
            textview.setText(web[position]);
            imageview.setImageResource(imageId[position]);
          } else {
            grid = (View) convertView;
          }

        return grid;
    }

}

Answer 1

为什么onItemClickListener无法正常工作，可能是因为您的Buttons获得了每个项目的重点。尝试为focusable="false"中的每个项目Buttons设置gridview_layout.xml。

但是，您获得的崩溃是NullPointerException（下次确保发布Logcat以便其他人可以轻松提供帮助），因为id中btnn1没有gridview.xml你提到的{1}}。 id位于gridview_layout.xml内。

因此，您需要创建自定义BaseAdapter并设置为Adapter的{{1}}。然后，在此自定义GridView内的覆盖getView方法中，您将获得BaseAdapter，就像您未能做到的那样。

以下是为Button创建BaseAdapter的示例。

http://www.mkyong.com/android/android-gridview-example/

Answer 2

您的应用程序崩溃，因为btn11属于gridview_layout.xml。但您已将gridview.xml设置为内容视图。您只能引用属于您在setContentView(layoutResID)

中设置的xml布局的视图

看起来你搞砸了。

如果您正在寻找自定义网格视图，请查看以下示例。

http://www.learn2crack.com/2014/01/android-custom-gridview.html

使GridView可以在android中单击

2 个答案: