Question

我在Android中创建了一个可扩展的列表视图，但我不知道如何使用Intent将childPosition设置为打开Activity。我的可扩展阵列表代码是Bellow：

package com.am.expandablelist2;

import java.util.HashMap;
import java.util.List;

import android.R;
import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class ExpandableListAdapter extends BaseExpandableListAdapter {

private Context context;
private List<String> listDataHeader; //Header Title
//Child Title
private HashMap<String, List<String>> listDataChild;

public ExpandableListAdapter(Context context, List<String> listDataHeader, 
        HashMap<String, List<String>> listDataChild){
    this.context = context;
    this.listDataHeader = listDataHeader;
    this.listDataChild = listDataChild;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    // TODO Auto-generated method stub
    return this.listDataChild.get(this.listDataHeader.get(groupPosition)).get(childPosition);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    // TODO Auto-generated method stub
    return childPosition;
}

@Override
public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView,
        ViewGroup parent) {
    // TODO Auto-generated method stub
    final String childText = (String) getChild(groupPosition, childPosition);
    if (convertView == null){
        LayoutInflater infalInflater = (LayoutInflater) this.context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(com.am.expandablelist2.R.layout.list_item, null);
    }
    TextView txtListChild = (TextView) convertView.findViewById(com.am.expandablelist2.R.id.tvListItem);
    txtListChild.setText(childText);

    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    // TODO Auto-generated method stub
    return this.listDataChild.get(this.listDataHeader.get(groupPosition)).size();
}

@Override
public Object getGroup(int groupPosition) {
    // TODO Auto-generated method stub
    return this.listDataHeader.get(groupPosition);
}

@Override
public int getGroupCount() {
    // TODO Auto-generated method stub
    return this.listDataHeader.size();
}

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

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, 
        ViewGroup parent) {
    // TODO Auto-generated method stub
    String headerTitle = (String) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this.context.
                getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(com.am.expandablelist2.R.layout.list_group, null);

    }
    TextView lblListHeader = (TextView) convertView.findViewById(com.am.expandablelist2.R.id.tvListHeader);
    lblListHeader.setTypeface(null,Typeface.BOLD);
    lblListHeader.setText(headerTitle);
    return convertView;
}

@Override
public boolean hasStableIds() {
    // TODO Auto-generated method stub
    return false;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    // TODO Auto-generated method stub
    return true;
}



}

和我的主要活动如下：

public class MainActivity extends Activity {

ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //get the listView
    expListView = (ExpandableListView) findViewById(R.id.lvExp);

    //Preparing List Data
    prepareListData();

    listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);

    //Setting List Adapter
    expListView.setAdapter(listAdapter);

    //List View Group Click Listener
    expListView.setOnGroupClickListener(new OnGroupClickListener() {

        @Override
        public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition,
                long id) {
            //Toast.makeText(getApplicationContext(), "Group Clicked " + listDataHeader.get(groupPosition), Toast.LENGTH_SHORT).show();
            return false;
        }
    });

    expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

        @Override
        public void onGroupExpand(int groupPosition) {
            Toast.makeText(getApplicationContext(), listDataHeader.get(groupPosition) + " Expanded", Toast.LENGTH_SHORT).show();
        }
    });

    expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {

        @Override
        public void onGroupCollapse(int groupPosition) {
            Toast.makeText(getApplicationContext(), listDataHeader.get(groupPosition) + " Collapsed", Toast.LENGTH_SHORT).show();   
        }
    });
        expListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v, int groupPosition,
                    int childPosition, long id) {
                // TODO Auto-generated method stub
                Toast.makeText(getApplicationContext(), listDataHeader.get(groupPosition) + ":" + listDataChild.get(listDataHeader.get(groupPosition)).get(childPosition), Toast.LENGTH_SHORT).show();


                return false;
            }
        });
    }


private void prepareListData() {
    // TODO Auto-generated method stub
    listDataHeader = new ArrayList<String>();
    listDataChild = new HashMap<String, List<String>>();

    //Adding Group Data
    listDataHeader.add("گروه E");
    listDataHeader.add("گروه F");
    listDataHeader.add("گروه C");
    listDataHeader.add("گروه D");

    //Adding Child Data
    List<String> groupE = new ArrayList<String>();
    groupE.add("EXW");


    List<String> groupF = new ArrayList<String>();
    groupF.add("FCA");
    groupF.add("FAS");
    groupF.add("FOB");

    List<String> groupC = new ArrayList<String>();
    groupC.add("CFR");
    groupC.add("CIF");
    groupC.add("CPT");
    groupC.add("CIP");

    List<String> groupD = new ArrayList<String>();
    groupD.add("DAF");
    groupD.add("DES");
    groupD.add("DEQ");
    groupD.add("DDU");
    groupD.add("DDP");

    listDataChild.put(listDataHeader.get(0), groupE);
    listDataChild.put(listDataHeader.get(1), groupF);
    listDataChild.put(listDataHeader.get(2), groupC);
    listDataChild.put(listDataHeader.get(3), groupD);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}

如果有人可以帮助我在主要活动中添加意图，我感到很高兴。

Answer 1

如果我理解你的问题，请告诉我：
您希望在选择/单击子列表项时启动活动。？

Answer 2

最后我找到了我的问题的答案，但如果有人能提供更好的解决方案，我们将不胜感激。

实际上我在onChildClick（ExpandableListView ...）方法中添加了以下代码：

String ldc = listDataChild.get(listDataHeader.get(groupPosition)).get(childPosition);
            if (ldc == "EXW") {
                Intent intent = new Intent(getApplicationContext(), EXW.class);
                startActivity(intent);
            }
            if (ldc == "FCA") {
                Intent intent = new Intent(getApplicationContext(), FCA.class);
                startActivity(intent);
            }

请注意我创建了两个名为EXW和FCA的Activity。它们的名称与子列表视图中的子项名称完全相同。现在，当我选择每个EXW或FCA子项时，它们的相关活动将打开。我可以为每个子项创建一个活动项目与上面相同。

如何设置childPosition以打开其Activity

2 个答案: