代碼可以正常運行,沒有任何錯誤或警告,但可擴展列表未顯示,這是代碼

public class MainActivity extends Activity implements ExpandableListView.OnChildClickListener{

ArrayList childitems;

ArrayList groupitems;

ExpandableListView list;

@Override

protected void onCreate(Bundle savedInstanceState) {

setContentView(R.layout.activity_main);

list=(ExpandableListView)findViewById(R.id.list);

list.setOnChildClickListener(this);

addGroupItems();

addChildItems();

LayoutInflater inflater=(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

ExpandableListAdapterImpl adapter=new ExpandableListAdapterImpl(inflater, this, groupitems, childitems);

list.setAdapter(adapter);

super.onCreate(savedInstanceState);

}

private void addChildItems() {

ArrayList childlist;

try {

childitems=new ArrayList();

childlist=new ArrayList();

childlist.add("Pragnani");

childlist.add("Kinnera");

childlist.add("Good");

childitems.add(childlist);

childlist=new ArrayList();

childlist.add("Bannu");

childlist.add("Kinnera");

childlist.add("Good");

childitems.add(childlist);

} catch (Exception e) {

e.printStackTrace();

}

}

private void addGroupItems() {

try {

groupitems=new ArrayList();

groupitems.add("My Details 1");

groupitems.add("My Details 2");

} catch (Exception e) {

e.printStackTrace();

}

}

@Override

public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {

// TODO Auto-generated method stub

return false;

}

}

這是activity_main.xml

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity" >

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/list"

>

可擴展列表視圖適配器實現

public class ExpandableListAdapterImpl extends BaseExpandableListAdapter

{

LayoutInflater inflatter;

Context context;

ArrayList groupitems;

ArrayList childitems;

ExpandableListAdapterImpl(LayoutInflater inflater,Activity activity,ArrayList groupitems,ArrayList childitems)

{

super();

this.inflatter=inflater;

context=activity;

this.groupitems=groupitems;

this.childitems=childitems;

}

@Override

public Object getChild(int groupPosition, int childPosition) {

// TODO Auto-generated method stub

return null;

}

@Override

public long getChildId(int groupPosition, int childPosition) {

// TODO Auto-generated method stub

return 0;

}

@Override

public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

ArrayList childtemp=(ArrayList) childitems.get(groupPosition);

try {

if(convertView==null)

{

convertView=inflatter.inflate(R.layout.childrow, null);

}

Button button=(Button)convertView.findViewById(R.id.button1);

button.setText(childtemp.get(groupPosition).toString());

} catch (Exception e) {

e.printStackTrace();

}

return convertView;

}

@Override

public int getChildrenCount(int groupPosition) {

// TODO Auto-generated method stub

return 0;

}

@Override

public Object getGroup(int groupPosition) {

// TODO Auto-generated method stub

return null;

}

@Override

public int getGroupCount() {

// TODO Auto-generated method stub

return 0;

}

@Override

public long getGroupId(int groupPosition) {

// TODO Auto-generated method stub

return 0;

}

@Override

public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

try {

if(convertView==null)

{

convertView=inflatter.inflate(R.layout.grouprow, null);

}

CheckedTextView view=(CheckedTextView) convertView.findViewById(R.id.textView1);

view.setText(groupitems.get(groupPosition).toString());

view.setChecked(isExpanded);

} catch (Exception e) {

e.printStackTrace();

}

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 false;

}

}

這是grouprow.xml

xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="60dp"

android:layout_marginLeft="5dp"

android:drawableRight="@drawable/plusminus"

android:gravity="center_vertical"

android:padding="10dp"

android:text="@string/hello_world"

android:textColor="#FFFFFF"

android:textSelectHandleLeft="@string/hello_world"

android:textSize="14sp"

android:textStyle="bold" />

childrow.xml

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

android:id="@+id/button1"

android:background="@drawable/playersdetails"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="" />

我想知道我想念的地方…在此先感謝

總結

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