主要代码：
MainActivity.java
package com.example.jizhangben;
import android.content.DialogInterface;
import android.database.Cursor;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.SearchView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private List<CostBean> mCostBeanList;
private DatabaseHelper mDatabaseHelper;
private CostListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mDatabaseHelper=new DatabaseHelper(this);
mCostBeanList=new ArrayList<>();
ListView costList= (ListView) findViewById(R.id.lv_main);
initCostData();
adapter = new CostListAdapter(this, mCostBeanList);
costList.setAdapter(adapter);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
LayoutInflater inflate=LayoutInflater.from(MainActivity.this);
View viewDialog=inflate.inflate(R.layout.new_cost_data,null);
final EditText tltle= (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("添加记录");
builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
CostBean costBean=new CostBean();
costBean.CostTitle=tltle.getText().toString();
costBean.CostMoney=money.getText().toString();
costBean.CostDate=date.getYear()+"-"+(date.getMonth()+1)+"-"+
date.getDayOfMonth();
mDatabaseHelper.insertCost(costBean);
mCostBeanList.add(costBean);
adapter.notifyDataSetChanged();
}
});
builder.setNegativeButton("取消",null);
builder.create().show();
}
});
}
private void initCostData() {
// mDatabaseHelper.deleteAllData();
// for (int i=0;i<6;i++) {
// CostBean costBean=new CostBean();
// costBean.CostTitle=i+"mock";
// costBean.CostDate="11-11";
// costBean.CostMoney="21";
// mDatabaseHelper.insertCost(costBean);
// }
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) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
CostBean.java
package com.example.jizhangben;
public class CostBean {
public String CostTitle;
public String CostDate;
public String CostMoney;
}
CostListAdapter.java
package com.example.jizhangben;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.List;
/**
* Created by 惠普 on 2021/2/18.
*/
public class CostListAdapter extends BaseAdapter {
private List<CostBean> mList;
private Context mContext;
private LayoutInflater mLayoutInflater;
public CostListAdapter(Context context,List<CostBean> list){
mContext=context;
mList=list;
mLayoutInflater=LayoutInflater.from(context);
}
@Override
public int getCount() {
return mList.size();
}
@Override
public Object getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if(convertView==null){
viewHolder=new ViewHolder();
convertView=mLayoutInflater.inflate(R.layout.list_item,null);
viewHolder.mTvCostTitle=(TextView)convertView.findViewById(R.id.tv_title);
viewHolder.mTvCostDate=(TextView)convertView.findViewById(R.id.tv_date);
viewHolder.mTvCostMoney=(TextView)convertView.findViewById(R.id.tv_cost);
convertView.setTag(viewHolder);
}else{
viewHolder= (ViewHolder) convertView.getTag();
}
CostBean bean=mList.get(position);
viewHolder.mTvCostTitle.setText(bean.CostTitle);
viewHolder.mTvCostDate.setText(bean.CostDate);
viewHolder.mTvCostMoney.setText(bean.CostMoney);
return convertView;
}
private static class ViewHolder{
public TextView mTvCostTitle;
public TextView mTvCostDate;
public TextView mTvCostMoney;
}
DataBaseHelper.java
package com.example.jizhangben;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
/**
* Created by 惠普 on 2021/2/20.
*/
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String COST_MONEY = "cost_money";
public static final String COST_DATE = "cost_date";
public static final String COST_TITLE = "cost_title";
public static final String IMOOC_COST = "Homework";
public DatabaseHelper(Context context) {
super(context, "homework", null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table if not exists Homework(" +
"id integer primary key, " +
"cost_title varchar, "+
"cost_date varchar, "+
"cost_money varchar)");
}
public void insertCost(CostBean costBean){
SQLiteDatabase database=getWritableDatabase();
ContentValues cv=new ContentValues();
cv.put(COST_TITLE,costBean.CostTitle);
cv.put(COST_DATE,costBean.CostDate);
cv.put(COST_MONEY,costBean.CostMoney);
database.insert(IMOOC_COST,null,cv);
}
public Cursor getAllCostData(){
SQLiteDatabase database=getWritableDatabase();
return database.query(IMOOC_COST, null, null, null, null, null, COST_DATE+" ASC");
}
public void deleteAllData(){
SQLiteDatabase database=getWritableDatabase();
database.delete(IMOOC_COST,null,null);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
AndroidMainifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.jizhangben">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.jizhangben.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_main" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
app:srcCompat="@android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="16dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.homework.MainActivity"
tools:showIn="@layout/activity_main">
<ListView
android:id="@+id/lv_main"
android:layout_width="336dp"
android:layout_height="463dp"
tools:layout_editor_absoluteY="8dp"
tools:layout_editor_absoluteX="8dp" />
</android.support.constraint.ConstraintLayout>
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="80dp">
<TextView
android:id="@+id/tv_title"
android:layout_width="100dp"
android:layout_height="80dp"
android:gravity="center"
android:textSize="20sp"
android:layout_marginLeft="15dp"
android:textColor="#836F91"
android:layout_toRightOf="@+id/tv_date"
android:text="costTitle"/>
<TextView
android:id="@+id/tv_date"
android:layout_width="wrap_content"
android:layout_height="80dp"
android:layout_marginLeft="10dp"
android:layout_alignParentLeft="true"
android:gravity="center"
android:singleLine="true"
android:textSize="25sp"
android:ellipsize="marquee"
android:focusable="true"
android:marqueeRepeatLimit="marquee_forever"
android:focusableInTouchMode="true"
android:textColor="#836F91"
android:text="costDate"/>
<TextView
android:id="@+id/tv_cost"
android:layout_width="wrap_content"
android:layout_height="80dp"
android:gravity="center"
android:layout_alignParentRight="true"
android:textSize="25sp"
android:textColor="#836F91"
android:layout_marginRight="20dp"
android:text="30"/>
</RelativeLayout>
new_cost_data.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:gravity="center"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/et_cost_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:hint="消费原因"/>
<EditText
android:id="@+id/et_cost_money"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:hint="消费金额"/>
<DatePicker
android:id="@+id/dp_cost_date"
android:layout_margin="4dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
