ListView，Spinner项内点击删除

在安卓工程中，很多时候都会用到下拉选单Spinner，ListView.有时候为了界面美观，操作方便，会在需求每个Item有一个删除或者其他按钮。本文旨在添加删除按钮，其他功能可以用类似的方法。
主布局文件，这里的btnAddSubject是用来添加新项的

<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:weightSum="1" android:gravity="center"><Spinner android:layout_width="0dp" android:layout_height="wrap_content" android:id="@+id/sprSubject" android:layout_weight="1"/><ImageButton android:id="@+id/btnAddSubject" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@layout/image_button_style_add" tools:ignore="ContentDescription" /></LinearLayout>Item的下拉style文件spinner_dropdown_style.xml<?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="30dp" android:orientation="vertical"><LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:orientation="horizontal" android:layout_weight="1" android:gravity="center"><LinearLayout android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="0.9" android:gravity="center"><TextView android:textAppearance="?android:attr/textAppearance" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="New Text" android:id="@+id/txtName" /></LinearLayout><ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btnDelete" android:src="@layout/image_button_style_delete" tools:ignore="ContentDescription"/></LinearLayout><View android:layout_width="match_parent" android:layout_height="2dp" android:background="@android:color/darker_gray"/></LinearLayout>

选择项用系统默然即可，我这里用了一个简单布局spinner_style.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center"><TextView android:textAppearance="?android:attr/textAppearance" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="New Text" android:id="@+id/txtName" /></LinearLayout>

Spinner貌似不能用按钮，否则会导致无法选中，ListView貌似可以，有需要可以自行测试，我这里用的是ImageView。ImageView实现点击反馈，可以参考我转载的
虽然文中用的是ImageButton，但是Button，Image同样有效。
首先准备Adapter文件

package czhy.grey.sun.exam.bin.adapter_;import android.content.Context;import android.support.annotation.NonNull;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import czhy.grey.sun.exam.R;import czhy.grey.sun.exam.bin.holder_.STHolder;import czhy.grey.sun.exam.bin.question_.QuestionSubject;import java.util.ArrayList;public class SpinnerSubjectAdapter extends ArrayAdapter { //数据 private ArrayList<QuestionSubject> list; // 用来导入布局 private LayoutInflater inflater = null;// 构造器 public SpinnerSubjectAdapter(ArrayList<QuestionSubject> list, Context context) { super(context,R.layout.spinner_style);this.list = list; inflater = LayoutInflater.from(context); }public void setInflater(Context context){ inflater = LayoutInflater.from(context); }@Override public int getCount() { return list.size(); }@Override public QuestionSubject getItem(int position) { return list.get(position); }@Override public long getItemId(int position) { return position; }@Override public View getDropDownView(int position, View convertView, ViewGroup parent) { STHolder holder; QuestionSubject subject = getItem(position); //下拉项 if (convertView == null) { convertView = inflater.inflate(R.layout.spinner_dropdown_style, parent, false);// 设置list中TextView的显示 holder = new STHolder(convertView); convertView.setTag(holder); }else { holder = (STHolder) convertView.getTag(); }holder.setName(subject.getSubjectName(),position); holder.setDelete(subject.isEmpty());return convertView; }@Override public View getView(int position, View convertView, ViewGroup parent) { STHolder holder; QuestionSubject subject = getItem(position); //选中显示 if (convertView == null) { convertView = inflater.inflate(R.layout.spinner_style,parent,false);// 设置list中TextView的显示 // 设置list中TextView的显示 holder = new STHolder(convertView); convertView.setTag(holder); }else { holder = (STHolder) convertView.getTag(); }holder.setName(subject.getSubjectName(),position); return convertView; }public int size() { return list.size(); }}以及Holder类package czhy.grey.sun.exam.bin.holder_;import android.view.View;import android.widget.ImageView;import android.widget.TextView;import czhy.grey.sun.exam.R;import czhy.grey.sun.exam.bin.manager_.STManger;public class STHolder { private TextView txtName; private ImageView btnDelete;public STHolder(View convertView){ txtName = (TextView) convertView.findViewById(R.id.txtName); btnDelete = (ImageView) convertView.findViewById(R.id.btnDelete); }public void setName(String name,int id) { txtName.setText(name); txtName.setTag(id); }public void setDelete(boolean isEmpty){ if(isEmpty){ btnDelete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { STManger.DeleteSubject((int)txtName.getTag()); STManger.NotifySubjectSetChanged(); } }); }else { btnDelete.setVisibility(View.INVISIBLE); } }}

然后是准备数据，因为这些数据每个界面都有用到，而且基本不会改变，所有选择定义一个static类，以及我的类里面有两个数据项

package czhy.grey.sun.exam.bin.manager_;import android.content.Context;import android.database.Cursor;import czhy.grey.sun.exam.bin.adapter_.SpinnerSubjectAdapter;import czhy.grey.sun.exam.bin.adapter_.SpinnerTypeAdapter;import czhy.grey.sun.exam.bin.question_.QuestionSubject;import czhy.grey.sun.exam.bin.question_.QuestionType;import java.util.ArrayList;public class STManger {private static ArrayList<QuestionSubject> subjectList; private static SpinnerSubjectAdapter subjectAdapter;private static ArrayList<QuestionType> typeList; private static SpinnerTypeAdapter typeAdapter;public STManger() { subjectList = new ArrayList<>(); typeList = new ArrayList<>();typeList.add(new QuestionType(0, "选择题型")); subjectList.add(new QuestionSubject(null, "选择科目",false));//隐藏删除图标DBManager.OpenDatabase(); Cursor cursor; cursor = DBManager.GetTypeOrSubject("Type_"); while (cursor.moveToNext()) { typeList.add(new QuestionType(Integer.parseInt(cursor.getString(0)), cursor.getString(1))); }cursor.close(); cursor = DBManager.GetTypeOrSubject("Subject_"); while (cursor.moveToNext()) { subjectList.add(new QuestionSubject(cursor.getString(0), cursor.getString(1),Integer.parseInt(cursor.getString(2)) == 0)); }cursor.close(); DBManager.CloseDatabase(); }public static ArrayList<QuestionSubject> GetSubjectList() { return subjectList; }public static ArrayList<QuestionType> GetTypeList() { return typeList; }public static String GetSubject(String subjectCode) { for (int i = 1; i< subjectList.size(); i++) if(subjectList.get(i).getSubjectCode().equals(subjectCode)) return subjectList.get(i).getSubjectName();return null; }public static void AddNewSubject(String code,String name) { subjectList.add(new QuestionSubject(code,name,true)); DBManager.OpenDatabase(); DBManager.AddNewSubject(code,name); DBManager.CloseDatabase(); }public static int GetTypeCode(String typeName) { for (QuestionType type:typeList) if(type.getTypeName().equals(typeName)) return type.getTypeCode();return 0; }public static void SetInflater(Context context){ if(subjectAdapter != null) { subjectAdapter.setInflater(context); typeAdapter.setInflater(context); } else { subjectAdapter = new SpinnerSubjectAdapter(subjectList, context); typeAdapter = new SpinnerTypeAdapter(typeList,context); } }public static SpinnerSubjectAdapter GetSubjectAdapter(){ return subjectAdapter; }public static void NotifySubjectSetChanged() { subjectAdapter.notifyDataSetChanged(); }public static void DeleteSubject(int id) { DBManager.OpenDatabase(); DBManager.DeleteSubject(subjectList.get(id).getSubjectCode()); DBManager.CloseDatabase(); subjectList.remove(id); }public static SpinnerTypeAdapter GetTypeAdapter(){ return typeAdapter; }public static void UpdateSubjectList() { subjectList.clear(); subjectList.add(new QuestionSubject(null, "选择科目",false));//隐藏删除图标DBManager.OpenDatabase(); Cursor cursor = DBManager.GetTypeOrSubject("Subject_"); while (cursor.moveToNext()) { subjectList.add(new QuestionSubject(cursor.getString(0), cursor.getString(1),cursor.getInt(2) == 0)); }cursor.close(); DBManager.CloseDatabase(); }}

数据封装类

package czhy.grey.sun.exam.bin.question_;public class QuestionSubject { private String subjectCode; private String subjectName; private boolean isEmpty;public QuestionSubject(String subjectCode, String subjectName,boolean isEmpty){ this.subjectCode = subjectCode; this.subjectName = subjectName; this.isEmpty = isEmpty; }public String getSubjectCode() { return subjectCode; }public String getSubjectName() { return subjectName; }public boolean isEmpty() { return isEmpty; }}

最后直接引用设置即可

STManger.SetInflater(this); (findViewById(R.id.btnAddSubject)).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { InputDialog inputDialog = new InputDialog(ImportActivity.this, new View.OnClickListener() { @Override public void onClick(View v) { InputDialog dialog = (InputDialog) v.getTag(); STManger.AddNewSubject(dialog.getCode(),dialog.getName()); ((Spinner)findViewById(R.id.sprSubject)).setSelection(STManger.GetSubjectAdapter().size() - 1); dialog.setInput(false); dialog.cancel(); } }); inputDialog.setTitle("请输入科目"); inputDialog.show(); } }); Spinner spinner = (Spinner) findViewById(R.id.sprSubject);spinner.setAdapter(STManger.GetSubjectAdapter());

但对于ListView来说，用static就不合适，表格有的时候要显示庞大的数据，以及需要显示不同的类别
这里可以参考我的InputDialog类，在Adapter里定义一个setOnClickListener(View.OnClickListener listener)方法
在Holder里定义setOnClickListener(View.OnClickListener listener)方法
这是InputDialog的源码

package czhy.grey.sun.exam.bin.dialog_;import android.app.Dialog; import android.content.Context; import android.os.Bundle; import android.text.Editable; import android.text.TextWatcher; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.Spinner;import java.util.ArrayList;import czhy.grey.sun.exam.R; import czhy.grey.sun.exam.bin.manager_.STManger; import czhy.grey.sun.exam.bin.question_.QuestionSubject;public class InputDialog extends Dialog { private boolean isInput; private EditText txtName; private String code; private View.OnClickListener listener;public InputDialog(Context context,View.OnClickListener listener) { super(context); this.listener = listener; }@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.view_dialog_input);txtName = (EditText)findViewById(R.id.txtName); txtName.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { isInput = true; }@Override public void onTextChanged(CharSequence s, int start, int before, int count) { }@Override public void afterTextChanged(Editable s) { if(txtName.getText().length()==0) isInput = false; } }); ArrayList<String> list = new ArrayList<>(); final char chCode = 'A'; for(int i=0;i<26;i++){ list.add((char)((int)chCode+i)+""); }for(QuestionSubject subject: STManger.GetSubjectList()){ list.remove(subject.getSubjectCode()); }Spinner spinner = (Spinner)findViewById(R.id.sprCode); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { code = parent.getAdapter().getItem(position).toString(); }@Override public void onNothingSelected(AdapterView<?> parent) { code = parent.toString(); } }); spinner.setAdapter(new ArrayAdapter<>(getContext(),R.layout.support_simple_spinner_dropdown_item,list));findViewById(R.id.btnAdd).setTag(this); findViewById(R.id.btnAdd).setOnClickListener(listener);findViewById(R.id.btnCancel).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { isInput = false; cancel(); } }); }public void setInput(boolean input) { isInput = input; }public String getName() { return txtName.getText().toString(); }public String getCode() { return code; }@Override public void cancel() { if(!isInput) super.cancel(); } }

相关连接：
ImageButton 点击反馈