Android Studio--家庭记账本（一）

　　今天通过观看视频，根据老师所讲内容，编译代码。实现了Android Studio记账本里面的增加功能

源代码如下：

CostBean.java：

package com.example.family;

import java.io.Serializable;

public class CostBean implements Serializable{
    public String costTitle;
    public String costDate;
    public String costMoney;

    public String getCostTitle() {
        return costTitle;
    }

    public void setCostTitle(String costTitle) {
        this.costTitle = costTitle;
    }

    public String getCostDate() {
        return costDate;
    }

    public void setCostDate(String costDate) {
        this.costDate = costDate;
    }

    public String getCostMoney() {
        return costMoney;
    }

    public void setCostMoney(String costMoney) {
        this.costMoney = costMoney;
    }

    @Override
    public String toString() {
        return "CostBean{" +
                "costTitle='" + costTitle + '\'' +
                ", costDate='" + costDate + '\'' +
                ", costMoney='" + costMoney + '\'' +
                '}';
    }
}

CostListAdapter.java：

package com.example.family;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;

public class CostListAdapter extends BaseAdapter{

    private List<CostBean> mList;
    private Context mContext;
    private LayoutInflater mLayoutInflater;

    public CostListAdapter(Context context,List<CostBean> list){
        mContext=context;
        mList=list;
        mLayoutInflater=LayoutInflater.from(context);
    }
    @Override
    public int getCount() {
        return mList.size();
    }

    @Override
    public Object getItem(int position) {
        return mList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        if(convertView==null){
            viewHolder=new ViewHolder();
            convertView=mLayoutInflater.inflate(R.layout.list_item,null);
            viewHolder.mTvCostTitle=(TextView)convertView.findViewById(R.id.tv_title);
            viewHolder.mTvCostDate=(TextView)convertView.findViewById(R.id.tv_date);
            viewHolder.mTvCostMoney=(TextView)convertView.findViewById(R.id.tv_cost);
            convertView.setTag(viewHolder);
        }else{
            viewHolder=(ViewHolder) convertView.getTag();
        }
        CostBean bean=mList.get(position);
        viewHolder.mTvCostTitle.setText(bean.costTitle);
        viewHolder.mTvCostDate.setText(bean.costDate);
        viewHolder.mTvCostMoney.setText(bean.costMoney);
        return convertView;
    }

    private static class ViewHolder{
        public TextView mTvCostTitle;
        public TextView mTvCostDate;
        public TextView mTvCostMoney;
    }
}

DatabaseHelper.java：

package com.example.family;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import androidx.annotation.Nullable;

public class DatabaseHelper extends SQLiteOpenHelper {

    public static final String COST_MONEY = "cost_money";
    public static final String COST_DATE = "cost_date";
    public static final String COST_TITLE = "cost_title";
    public static final String FAMILY = "family";

    public DatabaseHelper(@Nullable Context context) {
        super(context, FAMILY, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table if not exists family("+
                "id integer primary key,"+
                "cost_title varchar,"+
                "cost_date varchar,"+
                "cost_money varchar)");
    }

    public void insertCost(CostBean costBean){
        SQLiteDatabase database=getWritableDatabase();
        ContentValues cv=new ContentValues();
        cv.put(COST_TITLE,costBean.costTitle);
        cv.put(COST_DATE,costBean.costDate);
        cv.put(COST_MONEY,costBean.costMoney);
        database.insert(FAMILY,null,cv);
    }

    public Cursor getAllCostData(){
        SQLiteDatabase database=getWritableDatabase();
        return database.query(FAMILY,null,null,null,null,null,COST_DATE+" ASC");
    }

    public  void deleteAllData(){
        SQLiteDatabase database=getWritableDatabase();
        database.delete(FAMILY,null,null);
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

MainActivity.java：

package com.example.family;

import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.ListView;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {

    private List<CostBean> mCostBeanList;
    private DatabaseHelper mDatabaseHelper;
    private CostListAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        mDatabaseHelper=new DatabaseHelper(this);
        mCostBeanList=new ArrayList<>();
        ListView costList=(ListView)findViewById(R.id.lv_main);
        initCostData();
        mAdapter =new CostListAdapter(this,mCostBeanList);
        costList.setAdapter(mAdapter);

       FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
                LayoutInflater inflater=LayoutInflater.from(MainActivity.this);
                View viewDialog=inflater.inflate(R.layout.new_cost_data,null);
                final EditText title=(EditText)viewDialog.findViewById(R.id.et_cost_title);
                final EditText money=(EditText)viewDialog.findViewById(R.id.et_cost_money);
                final DatePicker date=(DatePicker) viewDialog.findViewById(R.id.dp_cost_date);
                builder.setView(viewDialog);
                builder.setTitle("New Cost");
                builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        CostBean costBean=new CostBean();
                        costBean.costTitle=title.getText().toString();
                        costBean.costMoney=money.getText().toString();
                        costBean.costDate=date.getYear() + "-" + (date.getMonth()+1) + "-" +
                                date.getDayOfMonth();
                        mDatabaseHelper.insertCost(costBean);
                        mCostBeanList.add(costBean);
                        mAdapter.notifyDataSetChanged();
                    }
                });
                builder.setNegativeButton("Cancle",null);
                builder.create().show();
            }
        });
    }

    private void initCostData() {
//        mDatabaseHelper.deleteAllData();
//        for (int i=0;i<6;i++) {
//            CostBean costBean=new CostBean();
//            costBean.costTitle=i+"mock";
//            costBean.costDate="2020-2-4";
//            costBean.costMoney="20";
//            mDatabaseHelper.insertCost(costBean);
//        }
        Cursor cursor=mDatabaseHelper.getAllCostData();
        if(cursor!=null){
            while(cursor.moveToNext()){
                CostBean costBean=new CostBean();
                costBean.costTitle=cursor.getString(cursor.getColumnIndex("cost_title"));
                costBean.costDate=cursor.getString(cursor.getColumnIndex("cost_date"));
                costBean.costMoney=cursor.getString(cursor.getColumnIndex("cost_money"));
                mCostBeanList.add(costBean);
            }
            cursor.close();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.action_chart) {
            Intent intent=new Intent(MainActivity.this,ChartsActivity.class);
            intent.putExtra("cost_list", (Serializable) mCostBeanList);
            startActivity(intent);
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

content_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/activity_main"
    tools:context=".MainActivity">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/lv_main"/>

</RelativeLayout>

list_item.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="80dp">
    <TextView
        android:id="@+id/tv_title"
        android:layout_width="150dp"
        android:layout_height="80dp"
        android:layout_marginLeft="10dp"
        android:layout_alignParentLeft="true"
        android:gravity="center"
        android:singleLine="true"
        android:textSize="35sp"
        android:ellipsize="marquee"
        android:text="costTitle"/>

    <TextView
        android:id="@+id/tv_date"
        android:layout_width="100dp"
        android:layout_height="80dp"
        android:gravity="center"
        android:textSize="20sp"
        android:layout_marginLeft="15dp"
        android:layout_toRightOf="@+id/tv_title"
        android:text="costDate"/>
    <TextView
        android:id="@+id/tv_cost"
        android:layout_width="100dp"
        android:layout_height="80dp"
        android:gravity="center"
        android:layout_alignParentRight="true"
        android:layout_marginRight="20dp"
        android:textSize="30sp"
        android:text="30"/>

</RelativeLayout>

new_cost_data.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:gravity="center"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/et_cost_title"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:hint="Cost Title"/>

    <EditText
        android:id="@+id/et_cost_money"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="4dp"
        android:hint="Cost Money"/>

    <DatePicker
        android:id="@+id/dp_cost_date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="4dp"
        android:datePickerMode="spinner"
        android:calendarViewShown="false"/>

</LinearLayout>

点击右下角“邮件”按钮实现增加。