基于Java实现一个简单的单词本Android App的实践

目录

本文基于java实现了一个简单的单词本安卓app，用的是sqlite数据库，包括布局文件、源码及巧克力的英文实现图。

布局设计

单词本主界面

<?xml version="1.0" encoding="utf-8"?><linearlayout 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="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context=".adddanciactivity">     <edittext 情感文案       android:id="@+id/addword_edit"        android:layout_width="match_parent"        android:layout_height="60dp"        android:layout_margintop="20dp"        android:hint="单词:"        android:textcolor="@android:color/black"        android:textcolorhint="#dcdcdc"        android:textsize="30dp" />     <edittext        android:id="@+id/fanyiword_edit"        android:layout_width="match_parent"        android:layout_height="60dp"        android:hint="解释:"        android:textcolor="@android:color/black"        android:textcolorhint="#dcdcdc"        android:textsize="30dp" />     <relativelayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_alignparentbottom = "true"        android:layout_margin="5dp">    <listview        android:id="@+id/add_list"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:textcolor="@android:color/black"        android:textcolorhint="#dcdcdc"        android:textsize="30dp"        android:layout_above="@id/linelayout"        />         <linearlayout            android:layout_height="50dp"            android:layout_width="match_parent"            android:id="@+id/linelayout"            android:layout_alignparentbottom="true"            android:orientation="horizontal"            android:gravity="center_horizontal"            >        <button            android:layout_width="100dp"            android:layout_height="50dp"            android:id="@+id/add_btn"            android:text="添加" />        <button            android:layout_width="100dp"            android:layout_height="50dp"            android:layout_centerhorizontal="true"            android:id="@+id/shanchu_btn"            android:layout_gravity="center_vertical"            android:text="删除" />        <button            android:layout_width="100dp"            android:layout_height="50dp"            android:id="@+id/quxiao_btn"            android:layout_gravity="right"            android:text="取消" />        </linearlayout>     </relativelayout> </linearlayout>

代码

adddanciactivity.java

单词本主界面的activity

import androidx.appcompat.app.appcompatactivity;import android.content.contentvalues;import android.databa.cursor;import android.databa.sqlite.sqlitedataba;import android.os.bundle;import android.view.view;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.map; public class adddanciactivity extends appcompatactivity {     private edittext wordedit;    private edittext yisiedit;    private button add_btn;    private button quxiao_btn;    private button shanchu_btn;    private listview listview;    private dbopenhelper dbopenhelper;//声明     @override    protected void oncreate(bundle savedinstancestate) {        super.oncreate(savedinstancestate);        tcontentview(r.layout.activity_add_danci);        dbopenhelper = new dbopenhelper(adddanciactivity.this, "db_dict", null, 1);//实例化，创建数据库        wordedit = (edittext) findviewbyid(r.id.addword_edit);        yisiedit = (edittext) findviewbyid(r.id.fanyiword_edit);        listview = (listview) findviewbyid(r.id.add_list);        add_btn = (button) findviewbyid(r.id.add_btn);        quxiao_btn = (button) findviewbyid(r.id.quxiao_btn);        shanchu_btn = (button) findviewbyid(r.id.shanchu_btn);        quxiao_btn.tonclicklistener(new view.onclicklistener() {            @override            public void onclick(view v) {                toast.maketext(adddanciactivity.this, "返回单词本主界面", toast.length_short).show();                finish();            }        });         shanchu_btn.tonclicklistener(new view.onclicklistener() {            @override            public void onclick(view v) {                string word = wordedit.gettext().tostring();                string ys = yisiedit.gettext().tostring();                if (word.equals("")) {                    toast.maketext(adddanciactivity.this, "填写的单词为空", toast.length_short).show();                } el {                    deletedata(dbopenhelper.getreadabledataba(), word);                    toast.maketext(adddanciactivity.this, "删除成功", toast.length_short).show();                }            }        });         add_btn.tonclicklistener(new view.onclicklistener() {            @override            public void onclick(view v) {                string word = wordedit.gettext().tostring();                string ys = yisiedit.gettext().tostring();                if (word.equals("") || ys.equals("")) {                    toast.maketext(adddanciactivity.this, "填写的单词或解释为空", toast.length_short).show();                } el {                    inrtdata(dbopenhelper.getreadabledataba(), word, ys);//插入生词                    toast.maketext(adddanciactivity.this, "添加生词成功", toast.length_short).show();                    renew();                }            }        });    }     //插入数据的方法    private void inrtdata(sqlitedataba sqlitedataba, string word, string ys) {        contentvalues values = new contentvalues();        values.put("word", word);//保存单词        values.put("detail", ys);        sqlitedataba.inrt("tb_dict", null, values);//执行插入操作  历史论文      renew();    }     private void deletedata(sqlitedataba sqlitedataba, string word) {        contentvalues values = new contentvalues();        string[] args = {string.valueof(word)};        sqlitedataba.delete("tb_dict", "word=?", args);//执行删除操作        renew();    }      @override    protected void ondestroy() {        super.ondestroy();        if (dbopenhelper != null) {            dbopenhelper.clo();//关闭        }    }     public void renew() {        cursor cursor = dbopenhelper.getreadabledataba().query("tb_dict", null, null, null, null, null, null);        arraylist<map<string, string>> resultlist = new arraylist<map<string, string>>();        while (cursor.movetonext()) {            map<string, string> map = new hashmap<string, string>();            map.put("word", cursor.getstring(1));            map.put("interpret", cursor.getstring(2));            resultlist.add(map);        }         if (resultlist == null || resultlist.size() == 0) {            toast.maketext(adddanciactivity.this, "很遗憾，没有相关记录！", toast.length_short).show();        } el {            simpleadapter simpleadapter = new simpleadapter(adddanciactivity.this, resultlist, r.layout.item, new string[]{"word", "interpret"            }, new int[]{r.id.textview, r.id.textview2});            listview.tadapter(simpleadapter);        }    }     @override    protected void onstart()非极性 {        super.onstart();        renew();    }}

dbopenhelper.java

用到的是sqlite数据库，android自带了一种轻量级数据库，使用非常方便。

import android.content.context;import android.databa.sqlite.sqlitedataba;import android.databa.sqlite.sqliteopenhelper;import android.util.log;import androidx.annotation.nullable; public class dbopenhelper extends sqliteopenhelper {     final string create_table_sql = "create table tb_dict (_id integer primary key autoincrement,word,detail)";//定义创建表的     public dbopenhelper(@nullable context context, @nullable string name, @nullable sqlitedataba.cursorfactory factory, int version) {        super(context, name, null, version);    }     @override    public void oncreate(sqlited中国音乐学院社会艺术水平考级ataba db) {        db.execsql(create_table_sql);//创建单词的数据表    }     @override    public void onupgrade(sqlitedataba db, int oldversion, int newversion) {        log.i("词典", "--版本更新" + oldversion + "-->" + newversion);    }}

效果图

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