家庭记账本安卓版开发：第五天

一、效果展示

点击第一项查看详情

修改其信息

保存修改

再次查看详情

删除该账目

二、问题

对于下拉框组件的值的从数据库获取并赋值并不清楚，还有点击事件的失效情况与布局之间的关联

三、部分原码

activity_info.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:background="@mipmap/info"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:text="账目信息"
        android:textSize="50sp"
        android:layout_gravity="center"
        android:layout_height="wrap_content"/>
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="40dp"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/update_type"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="账目类型"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/type_spin"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_toRightOf="@+id/update_type" />
    </RelativeLayout>

    <EditText
        android:id="@+id/bill_money"
        android:layout_marginTop="20dp"
        android:layout_width="250dp"
        android:hint="请输入账目金额"
        android:inputType="number"
        android:layout_gravity="center"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/bill_date"
        android:layout_marginTop="20dp"
        android:layout_width="250dp"
        android:hint="请输入账目日期"
        android:inputType="date"
        android:textSize="18dp"
        android:layout_gravity="center"
        android:layout_height="wrap_content"/>
    <EditText
        android:id="@+id/bill_remark"
        android:layout_width="250dp"
        android:layout_marginTop="20dp"
        android:layout_gravity="center"
        android:hint="在此处添加备注"
        android:layout_height="wrap_content"/>
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_gravity="center"
        android:layout_height="wrap_content">
    <Button
        android:id="@+id/update_btn"
        android:layout_width="wrap_content"
        android:text="保存修改"
        android:layout_gravity="left"
        android:layout_height="wrap_content"/>
    <Button
        android:id="@+id/delete_btn"
        android:layout_width="wrap_content"
        android:layout_toRightOf="@+id/update_btn"
        android:layout_marginLeft="20dp"
        android:text="删除该账目"
        android:layout_height="wrap_content"/>
    </RelativeLayout>
</LinearLayout>

QueryAllActivity.java

package com.example.familybook;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.Nullable;

import com.example.familybook.dao.BillDaoImpl;
import com.example.familybook.dao.IBillDao;
import com.example.familybook.entity.Bill;
import com.example.familybook.utils.ShowBillsAdapter;
import com.example.familybook.utils.ViewHolder;

import java.util.List;

public class QueryAllActivity extends Activity {
    private String mUsername;
    private String TAG="QueryAllActivity";
    private List <Bill> mShowBills;
    private List <ViewHolder> mViewHolder;
    private IBillDao mIBillDao;
    private SQLiteOpenHelper mBillDatabaseHelper;
    private ListView mShowBillList;
    private int mInfoCode=1;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list);
        this.setTitle("总览账目信息");

        //获取登录者的用户名
        Intent intent =getIntent();
        mUsername =intent.getStringExtra("username");
        Log.e(TAG,"使用者："+mUsername);

        //初始化控件
        initView();

        //获取表格布局
        mShowBillList=(ListView)findViewById(R.id.list_View);

        //获取从数据库获得的表单
        mShowBills=mIBillDao.listAllBill(mUsername);

        //新建并配置Show
        ShowBillsAdapter  ShowAdapter=new ShowBillsAdapter(mShowBills,this);
        mShowBillList.setAdapter(ShowAdapter);
        //添加事件监听
        initListener();
    }

    private void initListener() {
        mShowBillList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Bill bill =mShowBills.get(position);
                int bill_id=bill.get_id();
                Intent intent=new Intent();
                intent.putExtra("username",mUsername);
                intent.putExtra("bill_id",bill_id);
                intent.setClass(QueryAllActivity.this,InfoActivity.class);
                startActivityForResult(intent,mInfoCode);
            }
        });

    }

    private void initView() {
        mIBillDao =new BillDaoImpl(QueryAllActivity.this);

    }
    /**
     * 返回的结果在这里回调
     * @param requestCode
     * @param resultCode
     * @param data
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        String resultContent = null;
        //当我们判断这个请求码的时候，就知道，这是哪个界面返回的结果
        if (requestCode==mInfoCode) {
            if(resultCode==2){
                //注册成功
                Toast.makeText(this,"修改成功",Toast.LENGTH_SHORT).show();
            }else if(requestCode==3){
                //删除成功
                Toast.makeText(this,"删除成功",Toast.LENGTH_SHORT).show();
            }
        }
    }
}

InfoActivity.java

package com.example.familybook;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.Nullable;

import com.example.familybook.dao.BillDaoImpl;
import com.example.familybook.dao.IBillDao;
import com.example.familybook.entity.Bill;

import java.util.Calendar;

public class InfoActivity extends Activity {
    private Bill mBill;
    private String mUsername;
    private int mBillID;
    private int mYear;
    private int mMonth;
    private int mDay;
    private TextView mTypeSpin;
    private EditText mMoney;
    private TextView mDate;
    private EditText mRemark;
    private Button mUpdateBillBtn;
    private Button mDeleteBillBtn;
    private IBillDao mIBillDao;
    private String mTypeText;
    private String TAG="InfoActivity";

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_info);

        //获取登录者的用户名
        Intent intent =getIntent();
        mUsername =intent.getStringExtra("username");
        mBillID =intent.getIntExtra("bill_id",mBillID);

        Log.e(TAG,"使用者："+mUsername);
        Log.e(TAG,"账单号："+mBillID);

        //获取时间
        initDate();

        //初始化控件
        initView();

        //从数据库获取信息，并完成信息初始化
        mBill=mIBillDao.QueryBill(mBillID);
        initInfo();
        //添加监听事件
        initListener();
    }

    private void initInfo() {
        mTypeSpin.setText(mBill.getType());
        mMoney.setText(mBill.getMoney());
        mDate.setText(mBill.getDate());
        mRemark.setText(mBill.getRemark());
    }

    private void initDate() {
        //获取当前时间
        Calendar ca = Calendar.getInstance();
        mYear = ca.get(Calendar.YEAR);
        mMonth = ca.get(Calendar.MONTH);
        mDay = ca.get(Calendar.DAY_OF_MONTH);
    }

    private void initListener() {

        mDate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //调用时间选择器
                DatePickerDialog datePickerDialog = new DatePickerDialog(InfoActivity.this, R.style.MyDatePickerDialogTheme, onDateSetListener, mYear, mMonth, mDay);
                //获取时间戳
                long timeStamp = System.currentTimeMillis();
                //设置可以显示的最晚的时间
                datePickerDialog.getDatePicker().setMaxDate(timeStamp);
                //弹框
                datePickerDialog.show();
            }
        });
        mDeleteBillBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                deleteBill();
            }
        });
        mUpdateBillBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                updateBill();
            }
        });

    }

    /**
     * 进行修改
     */
    private void updateBill() {
        Bill bill=null;
        //获取账目类型
        mTypeText=mTypeSpin.getText().toString().trim();
        //获取账目金额
        String moneyText=mMoney.getText().toString().trim();
        //获取日期
        String  date= mDate.getText().toString().trim();
        //获取备注
        String remarkText=mRemark.getText().toString().trim();
        if(TextUtils.isEmpty(moneyText)){
            //账目金额为空
            Toast.makeText(this,"账目金额不可以为空",Toast.LENGTH_SHORT).show();
            return;
        }else if(TextUtils.isEmpty((CharSequence) date)){
            //账目日期为空
            Toast.makeText(this,"账目日期不可以为空",Toast.LENGTH_SHORT).show();
            return;
        }else {
            Log.e(TAG, "账户：" + mUsername);
            Log.e(TAG, "类型：" + mTypeText);
            Log.e(TAG, "金额：" + moneyText);
            Log.e(TAG, "日期：" + date);
            Log.e(TAG, "备注：" + remarkText);
            bill=new Bill(mUsername,mTypeText,moneyText,date,remarkText);
            boolean rs=mIBillDao.Update(mBillID,bill);
            Log.e(TAG,"rs："+rs);
            if (rs ) {
                //修改成功，跳回账页
                Intent intent = new Intent();
                setResult(2, intent);
                finish();
            }
        }
    }

    /**
     * 进行删除
     */
    private void deleteBill() {
        boolean rs=mIBillDao.DeleteBill(mBillID);
        if(rs){
            //删除成功，跳回账页
            Intent intent = new Intent();
            setResult(3, intent);
            finish();
        }

    }

    /**
     * 日期选择器对话监听
     */
    private DatePickerDialog.OnDateSetListener onDateSetListener = new DatePickerDialog.OnDateSetListener() {

        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
            mYear = year;
            mMonth = monthOfYear;
            mDay = dayOfMonth;

            String days;
            if (mMonth + 1 < 10) {
                if (mDay < 10) {
                    days = new StringBuffer().append(mYear).append("-").append("0").
                            append(mMonth + 1).append("-").append("0").append(mDay).append("").toString();
                } else {
                    days = new StringBuffer().append(mYear).append("-").append("0").
                            append(mMonth + 1).append("-").append(mDay).append("").toString();
                }

            } else {
                if (mDay < 10) {
                    days = new StringBuffer().append(mYear).append("-").
                            append(mMonth + 1).append("-").append("0").append(mDay).append("").toString();
                } else {
                    days = new StringBuffer().append(mYear).append("-").
                            append(mMonth + 1).append("-").append(mDay).append("").toString();
                }

            }

            mDate.setText(days);
        }
    };

    private void initView() {
        mTypeSpin =(TextView) this.findViewById(R.id.type_spin);
        mMoney =(EditText)this.findViewById(R.id.bill_money);
        mDate =(TextView) this.findViewById(R.id.bill_date);
        mRemark=(EditText)this.findViewById(R.id.bill_remark);
        mUpdateBillBtn=(Button)this.findViewById(R.id.update_btn);
        mDeleteBillBtn=(Button)this.findViewById(R.id.delete_btn);
        mIBillDao  =new BillDaoImpl(InfoActivity.this);
    }
}

原文地址：https://www.cnblogs.com/yeyueweiliang/p/12305426.html