JAVA日报

app开发(ThirdActivity)

package com.example.jizhang;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

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

import dao.userdao;

public class ThirdActivity extends AppCompatActivity implements View.OnClickListener {
    private String str="";
    private EditText editText1;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_third);
        findViewById(R.id.btn5).setOnClickListener(this);
        InitData();
    }
    private void InitData(){
        editText1 = (EditText) findViewById(R.id.edt_date3);
    }

    @Override
    public void onClick(View v) {
        str=editText1.getText().toString();
        userdao userDao=userdao.getInstance(getApplicationContext());
        if (str.length()==0) {
            Toast.makeText(getApplicationContext(), "请输入日期", Toast.LENGTH_SHORT).show();
            return;
        } else {
            userDao.delete(str);
            Toast.makeText(getApplicationContext(), "删除成功", Toast.LENGTH_SHORT).show();
            Intent intent=new Intent();
            intent.setClass(getApplicationContext(),MainActivity.class);
            startActivity(intent);
            return;
        }
    }
}