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。

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