Android Studio--家庭记账本（三）

　　点击右上角可以实现将花费以折线图的形式显示出来。同时将同一天的花费自动计算。暂时还没有加x,y轴

ChartsActivity.java：

package com.example.family;

import android.app.Activity;
import android.os.Bundle;

import androidx.annotation.Nullable;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import lecho.lib.hellocharts.model.ChartData;
import lecho.lib.hellocharts.model.Line;
import lecho.lib.hellocharts.model.LineChartData;
import lecho.lib.hellocharts.model.PointValue;
import lecho.lib.hellocharts.model.ValueShape;
import lecho.lib.hellocharts.util.ChartUtils;
import lecho.lib.hellocharts.view.Chart;
import lecho.lib.hellocharts.view.LineChartView;

public class ChartsActivity extends Activity {

    private LineChartView mChart;
    private Map<String,Integer> table=new TreeMap<>();
    private LineChartData mData;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.chart_view);
        mChart=(LineChartView) findViewById(R.id.chart);
        mData=new LineChartData();
        List<CostBean> allDate= (List<CostBean>) getIntent().getSerializableExtra("cost_list");
        generateValues(allDate);
        generateData();
    }

    private void generateData() {
        List<Line> lines=new ArrayList<>();
        List<PointValue> values=new ArrayList<>();
        int indexX=0;
        for (Integer value:table.values()){
            values.add(new PointValue(indexX,value));
            indexX++;
        }
        Line line=new Line(values);
        line.setColor(ChartUtils.COLORS[0]);
        line.setShape(ValueShape.CIRCLE);
        line.setPointColor(ChartUtils.COLORS[1]);
        lines.add(line);
        mData =new LineChartData(lines);
        mData.setLines(lines);
        mChart.setLineChartData(mData);
    }

    private void generateValues(List<CostBean> allDate) {
        if(allDate!=null){
            for(int i=0;i<allDate.size();i++){
                CostBean costBean=allDate.get(i);
                String costDate=costBean.costDate;
                int costMoney=Integer.parseInt(costBean.costMoney);
                if (!table.containsKey(costDate)){
                    table.put(costDate,costMoney);
                }else{
                    int originMoney=table.get(costDate);
                    table.put(costDate,originMoney+costMoney);
                }
            }
        }
    }
}

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.Button;
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 btn_add = findViewById(R.id.btn_add);
        btn_add.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() {

        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);
    }
}

chart_view.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:layout_height="match_parent"
    android:padding="10dp">

    <lecho.lib.hellocharts.view.LineChartView
        android:id="@+id/chart"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="20dp" />

</LinearLayout>

注意：在AndroidMainifest.xml中添加

<activity
            android:name=".ChartsActivity"
            android:label="Chart"/>