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Android实现一个简单的单词本

2022-01-26 | 秩名 | 点击：次

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、源码及实现图。

布局设计

单词本主界面

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<?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

        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

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import androidx.appcompat.app.AppCompatActivity;

import android.content.ContentValues;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

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);

        setContentView(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.setOnClickListener(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.setOnClickListener(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();

                } else {

                    deleteData(dbOpenHelper.getReadableDatabase(), word);

                    Toast.makeText(AddDanciActivity.this, "删除成功", Toast.LENGTH_SHORT).show();

                }

            }

        });

  

        add_btn.setOnClickListener(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();

                } else {

                    insertData(dbOpenHelper.getReadableDatabase(), 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 insertData(SQLiteDatabase sqLiteDatabase, String word, String ys) {

        ContentValues values = new ContentValues();

        values.put("word", word);//保存单词

        values.put("detail", ys);

        sqLiteDatabase.insert("tb_dict", null, values);//执行插入操作

        renew();

    }

  

    private void deleteData(SQLiteDatabase sqLiteDatabase, String word) {

        ContentValues values = new ContentValues();

        String[] args = {String.valueOf(word)};

        sqLiteDatabase.delete("tb_dict", "word=?", args);//执行删除操作

        renew();

    }

  

  

    @Override

    protected void onDestroy() {

        super.onDestroy();

        if (dbOpenHelper != null) {

            dbOpenHelper.close();//关闭

        }

    }

  

    public void renew() {

        Cursor cursor = dbOpenHelper.getReadableDatabase().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();

        } else {

            SimpleAdapter simpleAdapter = new SimpleAdapter(AddDanciActivity.this, resultList, R.layout.item, new String[]{"word", "interpret"

            }, new int[]{R.id.textView, R.id.textView2});

            listview.setAdapter(simpleAdapter);

        }

    }

  

    @Override

    protected void onStart() {

        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。

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import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.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 SQLiteDatabase.CursorFactory factory, int version) {

        super(context, name, null, version);

    }

  

    @Override

    public void onCreate(SQLiteDatabase db) {

        db.execSQL(CREATE_TABLE_SQL);//创建单词的数据表

    }

  

    @Override

    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        Log.i("词典", "--版本更新" + oldVersion + "-->" + newVersion);

    }

}

效果图

原文链接：https://blog.csdn.net/zhiwenganyong/article/details/122649922
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