如何赋予每个节点唯一的名称

Question

我想显示一棵树，其中包含其父，第二个节点及其子节点的单独名称。我使用Google帮助进行了编码。此代码显示树具有所有名称相同的第二个和子节点。我怎样才能给树的每个节点赋一个唯一的名字？

我的Java代码是：

package com.example.tree; 

import android.app.Activity; 
import android.content.Context; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseExpandableListAdapter; 
import android.widget.ExpandableListView; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.LinearLayout.LayoutParams; 

public class MainActivity extends Activity { 

     ExpandableListView explvlist; 

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

      explvlist = (ExpandableListView)findViewById(R.id.ParentLevel); 
      explvlist.setAdapter(new ParentLevel()); 

     } 

     public class ParentLevel extends BaseExpandableListAdapter 
     { 

     @Override 
     public Object getChild(int arg0, int arg1) 
     { 
     return arg1; 
     } 

     @Override 
     public long getChildId(int groupPosition, int childPosition) 
     { 
     return childPosition; 
     } 

     @Override 
     public View getChildView(int groupPosition, int childPosition, 
     boolean isLastChild, View convertView, ViewGroup parent) 
     { 
     CustExpListview SecondLevelexplv = new CustExpListview(MainActivity.this); 
     SecondLevelexplv.setAdapter(new SecondLevelAdapter()); 
     SecondLevelexplv.setGroupIndicator(null); 
     return SecondLevelexplv; 
     } 

     @Override 
     public int getChildrenCount(int groupPosition) 
     { 
     return 4; 
     } 

     @Override 
     public Object getGroup(int groupPosition) 
     { 
     return groupPosition; 
     } 

     @Override 
     public int getGroupCount() 
     { 
     return 1; 
     } 

     @Override 
     public long getGroupId(int groupPosition) 
     { 
     return groupPosition; 
     } 

     @Override 
     public View getGroupView(int groupPosition, boolean isExpanded, 
     View convertView, ViewGroup parent) 
     { 
     TextView tv = new TextView(MainActivity.this); 
     tv.setText("Unit Testing"); 
     tv.setBackgroundColor(Color.BLUE); 
     tv.setPadding(10, 7, 7, 7); 

     return tv; 
     } 

     @Override 
     public boolean hasStableIds() 
     { 
     return true; 
     } 

     @Override 
     public boolean isChildSelectable(int groupPosition, int childPosition) 
     { 
     return true; 
     }  
     } 

     public class CustExpListview extends ExpandableListView 
     { 

     int intGroupPosition, intChildPosition, intGroupid; 

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

     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
     { 
     widthMeasureSpec = MeasureSpec.makeMeasureSpec(960, MeasureSpec.AT_MOST); 
     heightMeasureSpec = MeasureSpec.makeMeasureSpec(600, MeasureSpec.AT_MOST); 
     super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
     } 
     } 

     public class SecondLevelAdapter extends BaseExpandableListAdapter 
     { 

     @Override 
     public Object getChild(int groupPosition, int childPosition) 
     { 
     return childPosition; 
     } 

     @Override 
     public long getChildId(int groupPosition, int childPosition) 
     { 
     return childPosition; 
     } 

     @Override 
     public View getChildView(int groupPosition, int childPosition, 
     boolean isLastChild, View convertView, ViewGroup parent) 
     { 
     TextView tv = new TextView(MainActivity.this); 
     tv.setText("Campaign Page should not be null"); 
     tv.setPadding(15, 5, 5, 5); 
     tv.setBackgroundColor(Color.RED); 
     tv.setLayoutParams(new ListView.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 
     return tv; 
     } 

     @Override 
     public int getChildrenCount(int groupPosition) 
     { 
     return 2; 
     } 

     @Override 
     public Object getGroup(int groupPosition) 
     { 
     return groupPosition; 
     } 

     @Override 
     public int getGroupCount() 
     { 
     return 1; 
     } 

     @Override 
     public long getGroupId(int groupPosition) 
     { 
     return groupPosition; 
     } 

     @Override 
     public View getGroupView(int groupPosition, boolean isExpanded, 
     View convertView, ViewGroup parent) 
     { 
     TextView tv = new TextView(MainActivity.this); 
     tv.setText("Get Campaign"); 
     tv.setPadding(12, 7, 7, 7); 
     tv.setBackgroundColor(Color.CYAN); 

     return tv; 
     } 

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

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

     } 

} 

我想树的每一个第二和子节点有一个唯一的名称和不同的颜色。

Answer 1

意味着您希望根据父名称查看数据树。所以你使用了可扩展列表视图。对..？

使用这些代码..

有

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:ignore="HardCodedText" > 

<ExpandableListView 
    android:id="@+id/expandableListView" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginBottom="40dip" 
    android:groupIndicator="@null" 
    android:scrollbars="none" > 
</ExpandableListView> 
</RelativeLayout> 

，并创建一个ExpandListGroup.java文件，并添加这些代码

public class ExpandListGroup { 

private String Name; 
private ArrayList<ExpandListChild> Items; 

public ExpandListGroup(String name, ArrayList<ExpandListChild> items) { 
    super(); 
    Name = name; 
    Items = items; 
} 

public String getName() { 
    return Name; 
} 

public void setName(String name) { 
    Name = name; 
} 

public ArrayList<ExpandListChild> getItems() { 
    return Items; 
} 

public void setItems(ArrayList<ExpandListChild> items) { 
    Items = items; 
} 

} 

添加另一个ExpandListChild.java的main.xml儿童文件

public class ExpandListChild { 

private String Name; 
private String Tag; 

public ExpandListChild(String name, String tag) { 
    super(); 
    Name = name; 
    Tag = tag; 
} 

public String getName() { 
    return Name; 
} 

public void setName(String name) { 
    Name = name; 
} 

public String getTag() { 
    return Tag; 
} 

public void setTag(String tag) { 
    Tag = tag; 
} 

} 

而在你MainActivity.java添加这些代码

public class ConfigureMyOrderItem extends MainActivity { 

private ArrayList<ExpandableConfigureGroup> group_list; 
private ArrayList<ExpandableConfigureChild> child_list; 
ExpandableListView mExpandableListView; 
ConfigureMyOrderAdapter adapter; 
Button btn_confirm; 

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

    initView(); 

} 

public void initView() { 
    mExpandableListView = (ExpandableListView) findViewById(R.id.expandableListViewConfigure); 
    btn_confirm = (Button) findViewById(R.id.btn_Confirm_order); 
    btn_confirm.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      Intent intent = new Intent(ConfigureMyOrderItem.this, 
        MyOrderActivity.class); 
      startActivity(intent); 
     } 
    }); 

    group_list = SetStandardGroups(); 

    adapter = new ConfigureMyOrderAdapter(ConfigureMyOrderItem.this, 
      mExpandableListView, group_list); 

    mExpandableListView.setAdapter(adapter); 
} 

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

public ArrayList<ExpandableConfigureGroup> SetStandardGroups() { 

    group_list = new ArrayList<ExpandableConfigureGroup>(); 
    child_list = new ArrayList<ExpandableConfigureChild>(); 

    group_list.add(new ExpandableConfigureGroup("Group", child_list)); 
    child_list.add(new ExpandableConfigureChild("Child1")); 
    child_list.add(new ExpandableConfigureChild("Child2")); 
    child_list.add(new ExpandableConfigureChild("Child3")); 
    child_list.add(new ExpandableConfigureChild("Child4")); 

    child_list = new ArrayList<ExpandableConfigureChild>(); 
    group_list.add(new ExpandableConfigureGroup("Category", 
      child_list)); 
    child_list.add(new ExpandableConfigureChild("Item1")); 
    child_list.add(new ExpandableConfigureChild("Item2")); 
    child_list.add(new ExpandableConfigureChild("Item3")); 
    child_list.add(new ExpandableConfigureChild("Item4")); 

} 

public void HomeButton(View v) { 
    startActivity(new Intent(v.getContext(), MainActivity.class)); 
} 

@Override 
public void onClickQuickView(View v) { 
    // TODO Auto-generated method stub 
    super.onClickQuickView(v); 
} 

@Override 
public void onClickQuickViewStatus(View v) { 
    // TODO Auto-generated method stub 
    super.onClickQuickViewStatus(v); 
} 

} 

同时创建ConfigureMyOrderAdapter.java文件

public class ConfigureMyOrderAdapter extends BaseExpandableListAdapter { 

private Context context; 
private ArrayList<ExpandableConfigureGroup> groups; 
private ExpandableListView mExpandableListView; 
private int[] groupStatus; 

public ConfigureMyOrderAdapter(Context context, 
     ExpandableListView mExpandableListView, 
     ArrayList<ExpandableConfigureGroup> groups) { 
    this.context = context; 
    this.groups = groups; 
    this.mExpandableListView = mExpandableListView; 
    groupStatus = new int[groups.size()]; 

    setListEvent(); 
} 

private void setListEvent() { 

    mExpandableListView 
      .setOnGroupExpandListener(new OnGroupExpandListener() { 
       @Override 
       public void onGroupExpand(int arg0) { 
        // TODO Auto-generated method stub 
        groupStatus[arg0] = 1; 
       } 
      }); 

    mExpandableListView 
      .setOnGroupCollapseListener(new OnGroupCollapseListener() { 
       @Override 
       public void onGroupCollapse(int arg0) { 
        // TODO Auto-generated method stub 
        groupStatus[arg0] = 0; 
       } 
      }); 
} 

public void addItem(ExpandableConfigureChild item, 
     ExpandableConfigureGroup group) { 
    if (!groups.contains(group)) { 
     groups.add(group); 
    } 
    int index = groups.indexOf(group); 
    ArrayList<ExpandableConfigureChild> ch = groups.get(index).getItems(); 
    ch.add(item); 
    groups.get(index).setItems(ch); 
} 

public Object getChild(int groupPosition, int childPosition) { 
    ArrayList<ExpandableConfigureChild> chList = groups.get(groupPosition) 
      .getItems(); 
    return chList.get(childPosition); 

} 

public long getChildId(int groupPosition, int childPosition) { 
    return childPosition; 
} 

@Override 
public View getChildView(int groupPosition, int childPosition, 
     boolean arg2, View view, ViewGroup arg4) { 
    ExpandableConfigureChild child = (ExpandableConfigureChild) getChild(
      groupPosition, childPosition); 

    if (view == null) { 
     @SuppressWarnings("static-access") 
     LayoutInflater infalInflater = (LayoutInflater) context 
       .getSystemService(context.LAYOUT_INFLATER_SERVICE); 
     view = infalInflater.inflate(
       R.layout.configure_list_raw_group_item, null); 
    } 
    TextView tv_price = (TextView) view.findViewById(R.id.item_price); 
    tv_price.setText(child.getTag().toString()); 
    tv_price.setTag(child.getTag()); 

    return view; 

} 

@Override 
public int getChildrenCount(int groupPosition) { 
    ArrayList<ExpandableConfigureChild> chList = groups.get(groupPosition) 
      .getItems(); 
    return chList.size(); 
} 

@Override 
public Object getGroup(int groupPosition) { 
    return groups.get(groupPosition); 
} 

@Override 
public int getGroupCount() { 
    return groups.size(); 
} 

@Override 
public long getGroupId(int groupPosition) { 
    return groupPosition; 
} 

@SuppressWarnings("static-access") 
@Override 
public View getGroupView(int groupPosition, boolean arg1, View view, 
     ViewGroup arg3) { 
    ExpandableConfigureGroup group = (ExpandableConfigureGroup) getGroup(groupPosition); 
    if (view == null) { 
     LayoutInflater inf = (LayoutInflater) context 
       .getSystemService(context.LAYOUT_INFLATER_SERVICE); 
     view = inf.inflate(R.layout.configure_list_raw_group, null); 
    } 
    TextView tv = (TextView) view.findViewById(R.id.txtRestaurantMenuName); 
    tv.setText(group.getName()); 

    ImageView img = (ImageView) view.findViewById(R.id.img_rightarrow); 
    if (groupStatus[groupPosition] == 0) { 
     img.setImageResource(R.drawable.navigation_next); 
    } else { 
     img.setImageResource(R.drawable.navigation_expandable); 
    } 
    return view; 
} 

@Override 
public boolean hasStableIds() { 
    return true; 
} 

@Override 
public boolean isChildSelectable(int arg0, int arg1) { 
    return true; 
} 

} 

，并创建两个XML自定义configure_list_raw_group.xml布局。所以它是

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="45dip" 
android:orientation="horizontal" 
android:weightSum="100" 
tools:ignore="HardCodedText" > 

<LinearLayout 
    android:layout_width="0dip" 
    android:layout_height="45dip" 
    android:layout_marginLeft="4dip" 
    android:layout_weight="88" 
    android:gravity="center_vertical" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/txtRestaurantMenuName" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="RestaurantMenu Name" 
     android:textSize="14sp" /> 
</LinearLayout> 

<ImageView 
    android:id="@+id/img_rightarrow" 
    android:layout_width="0dip" 
    android:layout_height="45dip" 
    android:layout_gravity="center_vertical" 
    android:layout_weight="7" 
    android:contentDescription="@string/hello_world" 
    android:src="@drawable/navigation_next_item" /> 

</LinearLayout> 

第二个为组configure_list_raw_group_item.xml的孩子。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/groupItem" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:clickable="true" 
android:orientation="horizontal" 
android:weightSum="100" 
tools:ignore="HardCodedText" > 

<TextView 
    android:id="@+id/item_title" 
    android:layout_width="0dp" 
    android:layout_height="wrap_content" 
    android:layout_marginLeft="15dp" 
    android:layout_weight="75" 
    android:text="sample" 
    android:textSize="12sp" /> 

</LinearLayout>