Android Studio 二級樹形列表---2（封裝）---補充
阿新 • • 發佈：2021-08-28
上一篇已經將二級樹形列表做了封裝，如果直接使用的話，看上去是沒有任何問題了，但是bug還是有的，比如一級選單下面沒有子欄目的話，點選會出現app閃退現象。這個就是個很大的缺陷，在加上實現操作中不僅僅是簡單的列表展示，還會有動態新增一個父節點，或者動態新增一個子節點，動態刪除一個節點，又或者動態刪除一個子節點。這些都是必須的。
所以接下來我要把這些都要補充進去，這樣用起來就基本滿足一般的需求了。
首先是LayerAdapterInterface介面：
package com.example.appview.Common.TwoTree; import android.view.View; import android.view.ViewGroup;public interface LayerAdapterInterface { /** * * @param groupPosition 第一層位置 * @param convertView 第一層檢視 * @return */ public View getGroupView(int groupPosition, View convertView); /** * * @param groupPosition 第一層組位置 * @param childPosition 第二層view位置 * @param convertView 第二層檢視 * @return*/ public View getChildView(int groupPosition, int childPosition, View convertView); }
接下來是通用類的封裝：
package com.example.appview.Common.TwoTree; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.Toast; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import com.example.appview.Demo; import com.example.appview.mian_page.Frament.Preject_Tance_Frament.ItemA_Model.ThreeTreeModel; import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; import java.util.List; import java.util.ListIterator;/* _ooOoo_ o8888888o 88" . "88 (| -_- |) O\ = /O ____/`---'\____ .' \\| |// `. / \\||| : |||// \ / _||||| -:- |||||- \ | | \\\ - /// | | | \_| ''\---/'' | | \ .-\__ `-` ___/-. / ___`. .' /--.--\ `. . __ ."" '< `.___\_<|>_/___.' >'"". | | : `- \`.;`\ _ /`;.`/ - ` : | | \ \ `-. \_ __\ /__ _/ .-` / / ======`-.____`-.___\_____/___.-`____.-'====== `=---=' ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 佛祖保佑 永無BUG */ public class LayerAdapterHelper<T1,T2,TControl extends LayerAdapterInterface> extends BaseExpandableListAdapter { public List<T1> oneTree; //二級列表第一層 public List<List<T2>> twoTree;//二級列表第二層 private TControl tControl; //這個是我們初始化控制元件用的類，這個是每一個Activity頁面獨有的，因為每個佈局裡面的內容可能不一樣。 private int RoneTree;//這個是二級列表第一層的頁面佈局 R.layout.佈局頁面 private int RtwoTree;//這個是二級列表第二層的頁面佈局 R.layout.佈局頁面 private Context context; LayoutInflater layoutInflater; public LayerAdapterHelper(Context context,List<T1> oneTree, List<List<T2>> twoTree,TControl tControl,int RoneTree,int RtwoTree){ this.context=context; this.oneTree=oneTree; this.twoTree=twoTree; this.tControl=tControl; this.RoneTree=RoneTree; this.RtwoTree=RtwoTree; layoutInflater = LayoutInflater.from(context); } //保證每次只展開一組 public void OnlyOne(ExpandableListView expandableListView){ expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener(){ @Override public void onGroupExpand(int groupPosition) { //保證每次只展開一組 int count=expandableListView.getExpandableListAdapter().getGroupCount(); for(int i=0;i<count; i++){ if(groupPosition != i){ expandableListView.collapseGroup(i); } } } }); } // 這裡是控制如果列表沒有孩子選單不展開的效果 public void IsChildenCount(ExpandableListView expandableListView){ expandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() { @Override public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) { // TODO Auto-generated method stub if (twoTree.get(groupPosition)==null) {// isEmpty沒有 Toast.makeText(context, "你點選了~" + groupPosition + "~項", Toast.LENGTH_SHORT).show(); return true; } else { return false; } } }); } //向第一層樹形中新增一個元素 public void add(int groupPosition,T1 t) { if (oneTree == null) { oneTree= new ArrayList<>(); } oneTree.add(groupPosition,t); twoTree.add(groupPosition,null); notifyDataSetChanged(); } //向第二層樹形中新增一個元素 public void addItem(int groupPosition, T2 t) { if (twoTree.get(groupPosition) == null) { Toast.makeText(context, "你點選了~" + groupPosition + "~項", Toast.LENGTH_SHORT).show(); List<T2> list=new ArrayList<>(); list.add(t); twoTree.set(groupPosition,list); }else{ twoTree.get(groupPosition).add(t); } notifyDataSetChanged(); } //向第一層樹形中特定位置移除一個元素 public void remove(int position) { if (oneTree != null) { oneTree.remove(position); } notifyDataSetChanged(); } //向第二層樹形中特定位置移除一個元素 public void remove(int groupPosition,int childPosition) { if (twoTree.get(groupPosition).get(childPosition)!=null) { twoTree.get(groupPosition).remove(childPosition); } notifyDataSetChanged(); } //組數量 @Override public int getGroupCount() { return oneTree.size(); } //子View數量 @Override public int getChildrenCount(int groupPosition) { return twoTree.get(groupPosition).size(); } //獲取組物件 @Override public Object getGroup(int groupPosition) { return oneTree.get(groupPosition); } //獲取子View物件 @Override public Object getChild(int groupPosition, int childPosition) { return twoTree.get(groupPosition).get(childPosition); } // 組View下標 @Override public long getGroupId(int groupPosition) { return groupPosition; } //子View下標 @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public boolean hasStableIds() { return false; } //取得用於顯示給定分組的檢視. 這個方法僅返回分組的檢視物件 @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { convertView= layoutInflater.inflate(RoneTree, null); return tControl.getGroupView(groupPosition,convertView); } //取得顯示給定分組給定子位置的資料用的檢視 @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { convertView= layoutInflater.inflate(RtwoTree, null); return tControl.getChildView(groupPosition,childPosition,convertView); } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return false; } }
實現類：
package com.example.appview; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.GradientDrawable; import android.os.Bundle; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ExpandableListView; import android.widget.LinearLayout; import android.widget.PopupWindow; import android.widget.TextView; import android.widget.Toast; import com.example.appview.Common.TwoTree.LayerAdapterHelper; import com.example.appview.Common.TwoTree.LayerAdapterInterface; import com.example.appview.mian_page.Frament.Preject_Tance_Frament.ItemA_Activity.Preject_ItemA_AddCaiJi; import com.example.appview.mian_page.Frament.Preject_Tance_Frament.ItemA_Activity.Preject_ItemA_AlterJZ; import com.example.appview.mian_page.Frament.Preject_Tance_Frament.ItemA_Activity.Preject_Item_AddJL; import com.example.appview.mian_page.Frament.Preject_Tance_Frament.ItemA_Model.JiLouModel; import com.example.appview.mian_page.Frament.Preject_Tance_Frament.ItemA_Model.SheiBeiModel; import java.util.ArrayList; import java.util.Date; import java.util.List; public class Demo extends AppCompatActivity { private ExpandableListView expandableListView; private List<JiLouModel> jiLou=new ArrayList<>(); private List<SheiBeiModel> sheiBei; private List<List<SheiBeiModel>> sheiBeiModels=new ArrayList<>(); private LayerAdapterHelper<JiLouModel,SheiBeiModel,myControl> adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_demo); expandableListView = findViewById(R.id.expandable_listView); initdata(); adapter=new LayerAdapterHelper<>(Demo.this,jiLou,sheiBeiModels,new myControl(),R.layout.preject_item_addcaiji_onetree,R.layout.preject_item_addcaiji_twotree); expandableListView .setAdapter(adapter); //保證每次只展開一組 adapter.OnlyOne(expandableListView); // 這裡是控制如果列表沒有孩子選單不展開的效果 adapter.IsChildenCount(expandableListView); } //創造資料 public void initdata(){ jiLou.add(new JiLouModel(1,"機樓1","",new Date(System.currentTimeMillis()))); jiLou.add(new JiLouModel(1,"機樓2","",new Date(System.currentTimeMillis()))); jiLou.add(new JiLouModel(1,"機樓3","",new Date(System.currentTimeMillis()))); sheiBei=new ArrayList<>(); sheiBei.add(new SheiBeiModel(1,"裝置1","")); sheiBei.add(new SheiBeiModel(1,"裝置2","")); sheiBei.add(new SheiBeiModel(1,"裝置3","")); sheiBeiModels.add(sheiBei); sheiBeiModels.add(null);//這個是如果父節點沒有子節點的情況下，自己新增一個null內容 sheiBei=new ArrayList<>(); sheiBei.add(new SheiBeiModel(1,"裝置4","")); sheiBei.add(new SheiBeiModel(1,"裝置5","")); sheiBei.add(new SheiBeiModel(1,"裝置6","")); sheiBeiModels.add(sheiBei); } class myControl implements LayerAdapterInterface{ @Override public View getGroupView(int groupPosition, View convertView) { TextView textView = convertView.findViewById(R.id.preject_item_caijiqi_onetree); textView.setText(adapter.oneTree.get(groupPosition).getJiLouName()); LinearLayout linearLayout=convertView.findViewById(R.id.preject_item_imagecaiji_onetree); linearLayout.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { getOne(linearLayout,groupPosition); } }); return convertView; } @Override public View getChildView(int groupPosition, int childPosition, View convertView) { convertView.setPadding(50,5,0,5); TextView textView = convertView.findViewById(R.id.preject_item_dianbiao); textView.setText(adapter.twoTree.get(groupPosition).get(childPosition).getSheBeiName()); LinearLayout linearLayout=convertView.findViewById(R.id.preject_item_layoutcaozuo_twotree); linearLayout.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { getTwo(linearLayout,groupPosition,childPosition); } }); return convertView; } } private void getOne(LinearLayout linearLayout, int position){ View popupView = View.inflate(Demo.this, R.layout.preject_item_pop_alter, null); Button btn1=popupView.findViewById(R.id.preject_item_alter_btn1); Button btn2=popupView.findViewById(R.id.preject_item_alter_btn2); btn1.setText("新增機樓"); btn2.setText("刪除"); GradientDrawable drawable1 =(GradientDrawable)btn1.getBackground(); drawable1.setColor(getResources().getColor(R.color.preject4)); GradientDrawable drawable2 =(GradientDrawable)btn2.getBackground(); drawable2.setColor(getResources().getColor(R.color.preject3)); PopupWindow popupWindow = new PopupWindow(popupView, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); popupWindow.setFocusable(true); popupWindow.setOutsideTouchable(true); popupWindow.setAnimationStyle(R.anim.move_pop_left_in); popupWindow.setBackgroundDrawable(new BitmapDrawable()); int popupWidth = popupView.getMeasuredWidth(); int popupHeight = popupView.getMeasuredHeight(); int[] location = new int[2]; linearLayout.getLocationOnScreen(location); popupWindow.showAtLocation(linearLayout, Gravity.NO_GRAVITY, location[0], location[1]); btn1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { popupWindow.dismiss(); // adapter.add(0,new JiLouModel(1,"機樓1","",new Date(System.currentTimeMillis()))); // adapter.addItem(position,new SheiBeiModel(1,"裝置4","")); } }); btn2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { popupWindow.dismiss(); } }); } private void getTwo(LinearLayout linearLayout, int position,int childenPosition){ View popupView = View.inflate(Demo.this, R.layout.preject_item_pop_alter, null); Button btn1=popupView.findViewById(R.id.preject_item_alter_btn1); Button btn2=popupView.findViewById(R.id.preject_item_alter_btn2); btn1.setText("新增機樓"); btn2.setText("刪除"); btn1.setVisibility(btn1.GONE); GradientDrawable drawable1 =(GradientDrawable)btn1.getBackground(); drawable1.setColor(getResources().getColor(R.color.preject4)); GradientDrawable drawable2 =(GradientDrawable)btn2.getBackground(); drawable2.setColor(getResources().getColor(R.color.preject3)); PopupWindow popupWindow = new PopupWindow(popupView, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); popupWindow.setFocusable(true); popupWindow.setOutsideTouchable(true); popupWindow.setAnimationStyle(R.anim.move_pop_left_in); popupWindow.setBackgroundDrawable(new BitmapDrawable()); int popupWidth = popupView.getMeasuredWidth(); int popupHeight = popupView.getMeasuredHeight(); int[] location = new int[2]; linearLayout.getLocationOnScreen(location); popupWindow.showAtLocation(linearLayout, Gravity.NO_GRAVITY, location[0], location[1]); btn2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { popupWindow.dismiss(); } }); } }
佈局頁面就不再放在去了，和上一篇一樣。
最後看一下效果圖：
.Net Core