android studio listview长按删除

activity_main.xml 的代码

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="wrap_content"     android:layout_height="match_parent"     tools:context=".MainActivity">      <TextView         android:id="@+id/textView5"         android:layout_width="45dp"         android:layout_height="17dp"         android:layout_marginLeft="4dp"         android:layout_marginStart="4dp"         android:layout_marginTop="16dp"         android:text="班级："         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toTopOf="parent" />      <TextView         android:id="@+id/textView6"         android:layout_width="47dp"         android:layout_height="wrap_content"         android:layout_marginLeft="4dp"         android:layout_marginStart="4dp"         android:layout_marginTop="29dp"         android:text="学号："         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toBottomOf="@+id/textView5" />      <EditText         android:id="@+id/editText3"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginLeft="12dp"         android:layout_marginStart="12dp"         android:ems="10"         android:inputType="textPersonName"         app:layout_constraintStart_toEndOf="@+id/textView5"         tools:layout_editor_absoluteY="0dp" />      <EditText         android:id="@+id/editText4"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginLeft="12dp"         android:layout_marginStart="12dp"         android:ems="10"         android:inputType="textPersonName"         app:layout_constraintStart_toEndOf="@+id/textView6"         app:layout_constraintTop_toBottomOf="@+id/editText3" />      <TextView         android:id="@+id/textView7"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginLeft="4dp"         android:layout_marginStart="4dp"         android:layout_marginTop="28dp"         android:text="姓名："         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toBottomOf="@+id/textView6" />      <EditText         android:id="@+id/editText5"         android:layout_width="wrap_content"         android:layout_height="45dp"         android:layout_marginLeft="16dp"         android:layout_marginStart="16dp"         android:ems="10"         android:inputType="textPersonName"         app:layout_constraintStart_toEndOf="@+id/textView7"         app:layout_constraintTop_toBottomOf="@+id/editText4" />      <Button         android:id="@+id/button"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginLeft="4dp"         android:layout_marginStart="4dp"         android:layout_marginTop="8dp"         android:text="添加"         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toBottomOf="@+id/editText5" />      <ListView         android:id="@+id/android:list"         android:layout_width="wrap_content"         android:layout_height="313dp"         app:layout_constraintBottom_toBottomOf="parent"         app:layout_constraintEnd_toEndOf="parent"         app:layout_constraintHorizontal_bias="0.0"         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toBottomOf="@+id/button"         app:layout_constraintVertical_bias="0.0" /> </android.support.constraint.ConstraintLayout>

item.xml 这是listview中的项

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/relativeLayout1"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical">       <LinearLayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="horizontal">          <TextView             android:id="@+id/grade"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_weight="1"             android:text= "班级"             android:textSize="20sp"             android:textColor="#0b0a0b"             tools:layout_editor_absoluteX="46dp"             android:paddingLeft="20dp"             tools:layout_editor_absoluteY="0dp" />          <TextView             android:id="@+id/studentId"             android:layout_width="wrap_content"             android:layout_height="27dp"             android:layout_weight="1"             android:text="学号"             android:textSize="20sp"             android:textColor="#0b0a0b"             tools:layout_editor_absoluteX="89dp"             android:paddingLeft="20dp"             tools:layout_editor_absoluteY="0dp" />          <TextView             android:id="@+id/name"             android:layout_width="wrap_content"             android:layout_height="27dp"             android:layout_alignParentLeft="true"             android:layout_alignParentTop="true"              android:layout_weight="1"             android:text="姓名"             android:textColor="#0b0a0b"             android:paddingLeft="20dp"             android:textSize="20sp" />     </LinearLayout>  </android.support.constraint.ConstraintLayout>

strings.xml一些字符串资源，后来嫌麻烦，直接硬编码了

<resources>     <string name="app_name">deletetry1</string>     <string name="grade">计算机151</string>     <string name="score">成绩</string>     <string name="banji">班级</string>     <string name="stid">学号</string>     <string name="name1">王菲</string>     <string name="name2">张宇</string>     <string name="name3">张学友</string>     <string name="name4">刘德华</string> </resources>

information类，这个类用来管理学生信息

package com.example.cie.deletetry1;  public class Information {     private String mGrade;     private int mStudentId;     private String mName;      public Information(String grade, int studentId, String mName) {         mGrade = grade;         mStudentId = studentId;         this.mName = mName;     }      public String getGrade() {         return mGrade;     }      public void setGrade(String grade) {         mGrade = grade;     }      public int getStudentId() {         return mStudentId;     }      public void setStudentId(int studentId) {         mStudentId = studentId;     }      public String getName() {         return mName;     }      public void setName(String mName) {         this.mName = mName;     } }

mainActivity.java

package com.example.cie.deletetry1;  import android.app.ListActivity; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.ContextMenu; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.*; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.Toast;  import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;  public class MainActivity extends ListActivity {      private Button mAddButton;     private EditText grade, studentid, name;     private Information[] mStudInfo = new Information[]{             new Information("计算机151", 2014012543, "张宇"),             new Information("计算机151", 2014012544, "刘德华"),             new Information("计算机151", 2014012545, "张学友"),     };     private ListView listview;     List<Map<String, Object>> mlistItems;     Map<String, Object> mmap;     //定义一个simpleAdapter，供列表项使用     SimpleAdapter mSimpleAdapter;      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          listview = (ListView) findViewById(android.R.id.list);         //为所有的listview的item注册contextMenu         this.registerForContextMenu(listview);          mlistItems = new ArrayList<Map<String, Object>>();         for (int i = 0; i < mStudInfo.length; i++) {             mmap = new HashMap<String, Object>();             mmap.put("grade", mStudInfo[i].getGrade());             mmap.put("studentId", mStudInfo[i].getStudentId());             mmap.put("name", mStudInfo[i].getName());             mlistItems.add(mmap);         }         mSimpleAdapter = new SimpleAdapter(this, mlistItems, R.layout.item, new String[]{"grade", "studentId", "name"}, new int[]{R.id.grade, R.id.studentId, R.id.name});         listview.setAdapter(mSimpleAdapter);          //添加对象         mAddButton = (Button) findViewById(R.id.button);         grade = (EditText) findViewById(R.id.editText3);         studentid = (EditText) findViewById(R.id.editText4);         name = (EditText) findViewById(R.id.editText5);         mAddButton.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 mmap = new HashMap<String, Object>();                 mmap.put("grade", grade.getText());                 mmap.put("studentId", studentid.getText());                 mmap.put("name", name.getText());                 mlistItems.add(mmap);                 mSimpleAdapter.notifyDataSetChanged();             }         });     }      @Override     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {         menu.setHeaderTitle("选择操作");         menu.add(0, 1, Menu.NONE, "删除");     }      @Override     public boolean onContextItemSelected(MenuItem item) {         AdapterContextMenuInfo menuInfo = (AdapterContextMenuInfo) item.getMenuInfo();         switch (item.getItemId()) {             case 1:                 //删除                 int pos = (int) listview.getAdapter().getItemId(menuInfo.position);                 if (mlistItems.remove(pos) != null) {                     System.out.println("success");                 } else {                     System.out.println("failed");                 }                 mSimpleAdapter.notifyDataSetChanged();                 Toast.makeText(getBaseContext(), "删除此项", Toast.LENGTH_SHORT).show();                 break;             default:                 //标记                 return super.onContextItemSelected(item);         }         return true;     }  }

效果图如上，这个例子使用

onCreateContextMenu为每个listview的项创建了一个菜单，然后使用

onContextItemSelected来响应当菜单被选中时的操作

原文：https://www.cnblogs.com/1915884031A-qqcom/p/9218919.html