Implementation functions:
1: First add data to the database (SQLite)
2: Use RecyclerView to display the data in the database
// Remarks: ImageButton with plus sign is used to add data, ImageButton with tick is used to obtain data and display
//First press the plus sign and then the tick. The
first step is to create an entity class Event
code as follows:
public class Event { private String Title; private String Time; private double Money; public Event(){
}
public Event(String Title, String Time, double Money)
{
this.Title = Title;
this.Time = Time;
this.Money = Money;
}
public String getTitle() {
return Title;
}
public String getTime() {
return Time;
}
public double getMoney() {
return Money;
}
public void setTitle(String Title) {
this.Title = Title;
}
public void setTime(String Time) {
this.Time = Time;
}
public void setMoney(double Money) {
this.Money = Money;
}
}The
second step is to create a MyHelper class to inherit the SQLiteOpenHelper class. The
code is as follows:
public class MyHelper extends SQLiteOpenHelper { public static final String DataBaseName = "Bookkeeping.db"; public static final SQLiteDatabase.CursorFactory factory = null; public static final int version = 1;
public static final String Title = "Title";
public static final String Time = "Time";
public static final String Money = "Money";
public static final String TableName = "BookkeepingTable";
public MyHelper(@Nullable Context context) {
super(context, DataBaseName, factory, version);
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql = "create table "+ TableName +" ( "+Title+" varchar(20) primary key, "+Time+" varchar(20), "+Money+" Double);";
// String sql = “create table BookkeepingTable (”
// + "Title text primary key, "
// + "Time text, "
// + “Money double)”;
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("drop table if exists "+TableName);
onCreate(db);
}
}The
third step: Establish the Dao class to implement the insert function. The
code is as follows:
public class Dao { public static final String TAG = "Bookkeeping"; private SQLiteDatabase DB; private MyHelper helper; public Dao(Context context){ helper = new MyHelper( context); } public void Insert(Event event){ DB = helper.getReadableDatabase(); if (DB.isOpen()) { ContentValues values = new ContentValues(); values.put(MyHelper.Title,event.getTitle() ); values.put(MyHelper.Time,event.getTime()); values.put(MyHelper.Money,event.getMoney()); long RowId = DB.insert(MyHelper.TableName,null,values); if( RowId == -1) Log.i(TAG, "Data insertion failed!");
else
Log.i(TAG, "Data inserted successfully!"+RowId);
DB.close();
}
}
}
Step 4: Create a recyclerview_item.xml for matching with the Recyclerview adapter. The
effect diagram is as follows:
code show as below:
<?xml version="1.0" encoding="utf-8"?>
}
Step 6: Create an AddThing activity to get the input data and insert the
AddThing.java code into the database as follows:
public class AddThing extends AppCompatActivity implements DatePicker.OnDateChangedListener{ private RadioGroup Group; private RadioButton Pay,InCome; private DatePicker datePicker; private TextView TipsTitle,TipsTime,TipsMoney,TipsMoneyType; private EditText editTitle,editTime,editMoney; private Button btn_Submit; public static int MoneyType = 0; public static String DatePickerTime = null; public static String Title = null; public static String Time = null; public static double Money = 0; Dao dao = null; Event event = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_thing);
btn_Submit = (Button) findViewById(R.id.submit);
datePicker = (DatePicker) findViewById(R.id.addThing);
Group = (RadioGroup) findViewById(R.id.Group);
Pay = (RadioButton) findViewById(R.id.Pay);
InCome = (RadioButton) findViewById(R.id.InCome);
TipsMoneyType = (TextView) findViewById(R.id.TipsMoneyType);
TipsTitle = (TextView) findViewById(R.id.TipsTitle);
TipsTime = (TextView) findViewById(R.id.TipsTime);
TipsMoney = (TextView) findViewById(R.id.TipsMoney);
editTitle = (EditText) findViewById(R.id.editTitle);
editTime = (EditText) findViewById(R.id.editTime);
editMoney = (EditText) findViewById(R.id.editMoney);
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int monthOfYear = calendar.get(Calendar.MONTH);
int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
datePicker.init(year, monthOfYear, dayOfMonth, this);
Group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radioButton = (RadioButton) group.findViewById(checkedId);
if (radioButton.getText().equals("支付")) {
MoneyType = 1;
} else {
MoneyType = 0;
}
}
});
btn_Submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dao = new Dao(AddThing.this);//创建数据库和表
Title = editTitle.getText().toString().trim();
Time = editTime.getText().toString();
try {
Money = Double.valueOf(editMoney.getText().toString());
} catch (NumberFormatException e) {
e.printStackTrace();
}
if ("".equals(Title))
{
Toast.makeText(AddThing.this,"不能为空",Toast.LENGTH_SHORT).show();
return;
}
dao.Insert(new Event(Title,Time,Money));
Log.d(Dao.TAG,"succees!");
}
});
}
@Override
public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
editTime.setText(year + "-"+ monthOfYear+ "-"+ dayOfMonth+ "");
}
} The
activity_add_thing.xml file is as follows: The
renderings are as follows:
//Note: RadioGroup has not been used for the time being, and you can count the amount of income or expenditure for a month or longer. The
code is as follows:
<RadioGroup
android:id="@+id/Group"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="100dp">
<RadioButton
android:id="@+id/Pay"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="支付"/>
<RadioButton
android:id="@+id/InCome"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="收入"/>
</RadioGroup>
</LinearLayout>
<TextView
android:id="@+id/TipsTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="请输入主题："
android:layout_marginTop="120dp"/>
<EditText
android:id="@+id/editTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Please input title:"
android:layout_marginLeft="90dp"
android:layout_marginTop="105dp"/>
<TextView
android:id="@+id/TipsTime"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="请选择时间："
android:layout_below="@id/TipsTitle"
android:layout_marginTop="50dp"/>
<EditText
android:id="@+id/editTime"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Please choose time:"
android:layout_below="@id/editTitle"
android:layout_marginTop="23dp"
android:layout_marginLeft="80dp"/>
<DatePicker
android:id="@+id/addThing"
android:layout_width="match_parent"
android:layout_height="100dp"
android:calendarViewShown="false"
android:spinnersShown="true"
android:datePickerMode="spinner"
android:headerBackground="#ffffff"
android:layout_below="@id/editTime"
android:layout_marginTop="20dp"/>
<TextView
android:id="@+id/TipsMoney"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入金额:"
android:layout_marginTop="20dp"
android:layout_below="@id/addThing"/>
<EditText
android:id="@+id/editMoney"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Please input money:"
android:layout_below="@id/addThing"
android:layout_marginLeft="80dp"
android:layout_marginTop="3dp"/>
<Button
android:id="@+id/submit"
android:layout_height="wrap_content"
android:layout_width="100dp"
android:text="Submit"
android:layout_below="@id/editMoney"
android:textAllCaps="false"
android:layout_marginTop="80dp"
android:gravity="center"
android:layout_marginLeft="150dp"/>
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Recyclerview = (RecyclerView) findViewById(R.id.EventDisplayInterface);
imageButton = (ImageButton) findViewById(R.id.AddButton);
imageButtonGet = (ImageButton) findViewById(R.id.getInformation);
//绑定适配器
LinearLayoutManager manager = new LinearLayoutManager(MainActivity.this);
Recyclerview.setLayoutManager(manager);
adapter = new MyRecyclerView(EventList);
Recyclerview.setAdapter(adapter);
imageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,AddThing.class);
startActivity(intent);
}
});
imageButtonGet.setOnClickListener(new View.OnClickListener() {
Event event = new Event();
@Override
public void onClick(View v) {
String Title = AddThing.Title;
String Time = AddThing.Time;
double Money = AddThing.Money;
if ( ("".equals(Title)) && ( "".equals(Time)))
{
Toast.makeText(MainActivity.this,"内容不能为空",Toast.LENGTH_SHORT).show();
}
else {
event = new Event(Title, Time, Money);
EventList.add(event);
adapter.notifyItemChanged(EventList.size() - 1);
Recyclerview.scrollToPosition(EventList.size() - 1);
Toast.makeText(MainActivity.this,"111111111",Toast.LENGTH_SHORT).show();
}
}
});
}
} The
activity_main.xml file is as follows: The
renderings are as follows:
//Note: ImageButton with plus sign is used to add data, and ImageButton with tick is used to obtain data and display it.
//First press the
code with plus sign and then click the tick as follows :
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/EventDisplayInterface"
android:layout_width=“match_parent”
android:layout_height=“wrap_content”/>
/ So the code has ended here, the following is the AVD running effect chart **************/
