安卓应用开发日记10

修正主界面显示资产，并且每次切入主界面重新计算总资产，简易记账本完工

package com.example.helloworld;

import static com.example.helloworld.util.DateUtil.getTime;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.example.helloworld.database.UserDbHelper;
import com.example.helloworld.enity.User;

import java.util.List;


public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private TextView result;
private UserDbHelper mHelper;
private int total;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView result=findViewById(R.id.res);
Button checkallbill=findViewById(R.id.checkAllBill);
Button addbill=findViewById(R.id.addBill);
Button over=findViewById(R.id.over);

mHelper = UserDbHelper.getInstance(this);
mHelper.openReadLink();
List<User> userList=mHelper.queryAll();
for(User user:userList){
total+=user.getMoney();
}
result.setText(total+"￥");
over.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent();
intent.setClass(MainActivity.this, CreateData.class);
startActivity(intent);
}
});
addbill.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent();
intent.setClass(MainActivity.this,AddBill.class);
startActivity(intent);
}
});

checkallbill.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent();
intent.setClass(MainActivity.this,CheckAllBill.class);
startActivity(intent);
}
});
}
@Override
protected void onResume() {
TextView result=findViewById(R.id.res);
super.onResume();
total=0;
List<User> userList=mHelper.queryAll();
for(User user:userList){
total+=user.getMoney();
}
result.setText(total+"￥");
}
@Override
public void onClick(View v) {

}
}

，安装到我手机上可以完美运行，准备录制视频