pmf4n7i39/StatisticalChartActivity.java

package com.example.yangenneng0.myapplication.viewUI;

import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import com.example.yangenneng0.myapplication.R;
import com.example.yangenneng0.myapplication.dao.UserDataDao;
import com.example.yangenneng0.myapplication.model.UserData;

import java.util.ArrayList;

public class StatisticalChartActivity extends AppCompatActivity {

    Button   lineChartBtn;// 折线图按钮
    Button pieChartBtn;  //饼状图按钮
    private ArrayList<UserData> UserDataList;
    AlertDialog.Builder builder;
    @Override
    protected void onCreate( Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.statistical_chart);

        UserDataDao userDataDao = new UserDataDao();
        UserDataList = userDataDao.getUserDataList();

        builder = new AlertDialog.Builder(this);
        builder.setTitle("没有数据");
        builder.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        initView();
    }

    /*
    *  绑定统计图页面内2个选项button click事件
    * */
    private void initView() {
        lineChartBtn = findViewById(R.id.line_chart_entrance_btn);
        pieChartBtn = findViewById(R.id.pie_chart_entrance_btn);

        //折线图入口
        lineChartBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (UserDataList.size() != 0) {
                    Log.d("222222222","333333333");
                    Intent intent = new Intent();
                    intent.setClass(StatisticalChartActivity.this, LineChartActivity.class);
                    StatisticalChartActivity.this.startActivity(intent);
                }else{
                    //页面返回时，弹出提示框，包括确认、取消按钮，提示文字
                    Log.d("222222222","222222222");
                    builder.show();
                }
            }
        });

        //饼状图入口
        pieChartBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (UserDataList.size() != 0) {
                    Intent intent = new Intent();
                    intent.setClass(StatisticalChartActivity.this, PieChartActivity.class);
                    StatisticalChartActivity.this.startActivity(intent);
                }else{
                    builder.show();
                }
            }
        });


    }
}