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查看账单功能实现

showActivity文件代码：

package com.example.keep;

import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.widget.TextView;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import static com.example.keep.Constants.TABLE_NAME;

public class ShowActivity extends AppCompatActivity {
    private DatabaseHelper myHelper;
    public SQLiteDatabase db;
    String str="";

    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_show);
        final TextView tv=(TextView)findViewById(R.id.allshow);
        myHelper=new DatabaseHelper(this);
        SQLiteDatabase db=myHelper.getWritableDatabase();
        Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null, null);//读取数据库所有信息
        if(cursor.moveToFirst()){
            do{
                String in_out=cursor.getString(cursor.getColumnIndex("in_out"));
                String money=cursor.getString(cursor.getColumnIndex("money"));
                String date=cursor.getString(cursor.getColumnIndex("date"));
                String type=cursor.getString(cursor.getColumnIndex("type"));
                String way=cursor.getString(cursor.getColumnIndex("way"));
               /* Log.d("chakan","盈亏为："+ye);
                Log.d("chakan","原因为："+why);
                Log.d("chakan","金额为："+money);
                Log.d("chakan","时间为："+time);*/
                str+=in_out+"		"+ money+"元		"+date+"		"+type+"			"+way+"
";//将数据库信息存到str中并换行
            }while (cursor.moveToNext());
        }
        cursor.close();
        tv.setText(str);//打印信息
    }
}

activity_show.xml文件代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ShowActivity"
    android:background="@mipmap/bj_2">
    <!--标题栏-->
    <include layout="@layout/titlebar" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:text="           金额        日期       类别    支付方式"/>
    <TextView
        android:id="@+id/allshow"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="25dp"
        android:textSize="20sp" />

</LinearLayout>

界面展示：