Question

我在GridView内使用自定义ScrollView。我知道这不是正确的方法。我没有任何其他方法来完成我的应用程序布局。

我想在item id == row_id中获取GridView数据库，但它不会返回正确的ID。而不是给row_id它给了我与数据库row_id不匹配的项的位置ID 我知道适配器中的位置id是row_id，我不知道为什么id与数据库不匹配。

以下是我在布局

上使用的GridView

 <info.androidhive.slidingmenu.MyGridView
    android:id="@+id/gridview11"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:columnWidth="278dp"
    android:numColumns="2"
    android:verticalSpacing="2dp"
    android:horizontalSpacing="0dp"
    android:stretchMode="columnWidth"
    android:gravity="center"
    android:isScrollContainer="false"
    android:focusable="false"
    android:focusableInTouchMode="false"
 />

这是自定义MyGridview代码。我在Github

中使用了这个

import android.content.Context;
import android.util.AttributeSet;
import android.view.ViewGroup;
import android.widget.GridView;

/**
 * ScrollViewの中のGridViewでも高さを可変にする<br>
 * https://stackoverflow.com/questions/8481844/gridview-height-gets-cut
 */
public class MyGridView extends GridView
{

    boolean expanded = false;

    public MyGridView(Context context)
    {
        super(context);
    }

    public MyGridView(Context context, AttributeSet attrs)
    {
        super(context, attrs);
    }

    public MyGridView(Context context, AttributeSet attrs,
                                    int defStyle)
    {
        super(context, attrs, defStyle);
    }

    public boolean isExpanded()
    {
        return expanded;
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        // HACK! TAKE THAT ANDROID!
        if (isExpanded())
        {
            // Calculate entire height by providing a very large height hint.
            // View.MEASURED_SIZE_MASK represents the largest height possible.
            int expandSpec = MeasureSpec.makeMeasureSpec(MEASURED_SIZE_MASK,
                    MeasureSpec.AT_MOST);
            super.onMeasure(widthMeasureSpec, expandSpec);

            ViewGroup.LayoutParams params = getLayoutParams();
            params.height = getMeasuredHeight();
        }
        else
        {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    public void setExpanded(boolean expanded)
    {
        this.expanded = expanded;
    }
}

最后，onlcikListener代码无法正常运行

 try {
            // OnClick

            best_product_gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                    //get position index of item here.

                    String indexid = String.valueOf(position);
                    Log.d("Index of Selected ", indexid);

                    // calling function
                     globalVariable.product_id =  position;
                    ((MainActivity)getActivity()).product();

                }
            });

    } 
    catch (Exception e)
    {
      Log.d("Error BestPrduct View","" + e);
    }

这是Adapter类

package info.androidhive.slidingmenu.AdpaterClass;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.squareup.picasso.Picasso;

import java.util.ArrayList;
import java.util.HashMap;

import info.androidhive.slidingmenu.R;
import info.androidhive.slidingmenu.library.Function_List;
import info.androidhive.slidingmenu.library.Global_JsonTags;
import info.androidhive.slidingmenu.library.Global_Variable;

/**
 * Created by clint19 on 1/21/2016.
 */
public class Best_Product extends BaseAdapter {
    View gridView;
    private Context context;
  /*  private DisplayImageOptions options;*/

    private LayoutInflater inflater;

    // josn vaules from json file library
    Global_JsonTags jsontags = new Global_JsonTags();
    Function_List lib_function =  new Function_List();
    Global_Variable globalVariable = new Global_Variable();
    private ArrayList<HashMap<String, String>> MyArr = new ArrayList<HashMap<String, String>>();

    public Best_Product(Context c,ArrayList<HashMap<String, String>> json_value) {
        // TODO Auto-generated method stub
        context = c;
        MyArr = json_value;

    }

    public int getCount() {
        // TODO Auto-generated method stub
        Log.d("size of item", "" + MyArr.size());
        return MyArr.size();
    }

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

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

    }


    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder holder;
        View view = convertView;
        TextView product_name;
        TextView product_price;
        ImageView imageView;
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View gridView;
        if (view == null) {
            view = new View(context);
            view = inflater.inflate(R.layout.home_best_collection, parent, false);
            holder = new ViewHolder();
            assert view != null;
            imageView = (ImageView) view.findViewById(R.id.imageView26);
           // holder.imageView = (ImageView) view.findViewById(R.id.imageView26);
            holder.progressBar = (ProgressBar) view.findViewById(R.id.progress);
            product_name = (TextView) view.findViewById(R.id.textView21);
            product_price = (TextView) view.findViewById(R.id.textView23);

            String name = MyArr.get(position).get("product_name");
            int namelength = name.length();
            if(namelength >= 33)
            {
                product_name.setText(MyArr.get(position).get("product_name").substring(0, 29) + "...");
            }
            else{product_name.setText(MyArr.get(position).get("product_name"));}
            product_price.setText(MyArr.get(position).get("product_price"));
            String product_status = MyArr.get(position).get("product_status");

            if(product_status.equals("false"))
            {

                Button add_to_cart = (Button) view.findViewById(R.id.add_to_cart1);
                add_to_cart.setVisibility(View.GONE);
                View background_height = (View) view.findViewById(R.id.bestproduct1);
            }
            else
            {
                Button add_to_cart = (Button) view.findViewById(R.id.add_to_cart1);
                add_to_cart.setVisibility(View.VISIBLE);
            }
            Log.d("setting up text", "setting up text");

            Picasso.with(context)
                    .load(MyArr.get(position).get("product_image"))
                    .placeholder(R.drawable.ic_stub) // optional
                    .error(R.drawable.ic_error)         // optional
                    .into(imageView);

            //view.setTag(holder);
        } else {
            holder = (ViewHolder) view.getTag();
        }


        return view;
    }


    static class ViewHolder {
        ImageView imageView;
        ProgressBar progressBar;
    }

}

我想从2小时内获得身份但没有运气。我关注了这些问题How to add gridview setOnItemClickListener和Android gridview OnItemClickListener以及此问题Get ID of View in GridView 可能更多。

谁能告诉我有什么问题。

Answer 1

我试图获取GridView数据库的项目ID == row_id但是它不正确的身份

这是因为您没有正确覆盖getItemId中的Adapter。假设您为适配器提供的数据集由bean类组成，您需要做的是覆盖getItemId(int position)，它返回long，并让它返回正确的id。 E.g。

@Override
public long getItemId(int position) {
   return getItem(position).getId();
}

正确的值作为long id的最后一个参数onItemClick传递。

如果你是CursorAdapter（或其具体实现的一个）的子类，你应该，因为你有一个基于游标的解决方案，你不需要覆盖它。 CursorAdapter已经返回了位置光标的_id列的值。

修改

@Override public long getItemId(int position) { HashMap<String, String> mapAtPostion = MyArr.get(position); return Long.valueOf(mapAtPostion.get("product_id")); }

Answer 2

您正在获取该项目的位置，因为这是您从方法inside 1st if ,total= 0 after making false total=1 after making false total=1 after making false total=1 inside 3rd if ,total= 1 true true true false true true false true false返回的内容。您需要从该方法返回数据库getItemId。

像这样改变你的方法

row_id

Answer 3

@Override
public long getItemId(int position) {

    return position;
}

CustmeAdapter示例

public class CustomAdapter extends BaseAdapter{

String [] result;
Context context;
int [] imageId;
private static LayoutInflater inflater=null;
public CustomAdapter(MainActivity mainActivity, String[] prgmNameList, int[] prgmImages) {
    // TODO Auto-generated constructor stub
    result=prgmNameList;
    context=mainActivity;
    imageId=prgmImages;
     inflater = ( LayoutInflater )context.
             getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

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

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

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

public class Holder
{
    TextView tv;
    ImageView img;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    Holder holder=new Holder();
    View rowView;

         rowView = inflater.inflate(R.layout.program_list, null);
         holder.tv=(TextView) rowView.findViewById(R.id.textView1);
         holder.img=(ImageView) rowView.findViewById(R.id.imageView1);

     holder.tv.setText(result[position]);
     holder.img.setImageResource(imageId[position]);

     rowView.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(context, "You Clicked "+result[position], Toast.LENGTH_LONG).show();
        }
    });

    return rowView;
}

}

自定义Gridview getitemid（）不返回右row_id

3 个答案: