记一笔功能实现
AddActivity文件代码：
package com.example.keep; import android.content.ContentValues; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.RadioButton; import android.widget.TextView; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import static com.example.keep.Constants.TABLE_NAME; public class AddActivity extends AppCompatActivity implements View.OnClickListener { private DatabaseHelper myHelper; private RadioButton ra_shouru; private RadioButton ra_zhichu; private EditText et_money; private EditText et_date; private EditText et_type; private EditText et_way; private TextView mTvShow; private Button mBtAdd; private Button mBtQuery; private Button mBtUpdate; private Button mBtDelete; public String in=""; public String out=""; public String money; public String date; public String type; public String way; public SQLiteDatabase db; public ContentValues values; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_add); myHelper = new DatabaseHelper(this); init(); } //实例化界面，获取各个控件的值 private void init() { ra_shouru=(RadioButton) findViewById(R.id.shouru); ra_zhichu=(RadioButton) findViewById(R.id.zhichu); et_money=(EditText) findViewById(R.id.edit_money); et_date=(EditText) findViewById(R.id.edit_date); et_type=(EditText) findViewById(R.id.edit_type); et_way=(EditText) findViewById(R.id.edit_way); mTvShow = (TextView) findViewById(R.id.ld_show); mBtAdd = (Button) findViewById(R.id.btn_add); mBtUpdate = (Button) findViewById(R.id.btn_update); mBtQuery = (Button) findViewById(R.id.btn_query); mBtDelete = (Button) findViewById(R.id.btn_delete); mBtAdd.setOnClickListener(this); mBtUpdate.setOnClickListener(this); mBtQuery.setOnClickListener(this); mBtDelete.setOnClickListener(this); } @Override //点击事件 public void onClick(View v) { switch(v.getId()) { //添加数据 case R.id.btn_add: addText(); queryText(); break; //查询数据 case R.id.btn_query: queryText(); break; //修改数据 case R.id.btn_update: updateText(); queryText(); break; //删除数据 case R.id.btn_delete: deleteText(); queryText(); break; } } //添加数据 public void addText() { money = et_money.getText().toString(); //获取金额 date = et_date.getText().toString(); //获取时间 type=et_type.getText().toString(); //获取类别 way=et_way.getText().toString(); //获取方式 //获取可读写的SQLiteDatabase对象 db = myHelper.getWritableDatabase(); //创建ContentValues对象 values = new ContentValues(); //将数据添加到ContentValues对象 if(ra_shouru.isChecked()){ in="收入"; values.put("in_out",in); } if(ra_zhichu.isChecked()){ out="支出"; values.put("in_out",out);//存性别 } values.put("money",money); values.put("date",date); values.put("type",type); values.put("way",way); if(in.equals("")&&out.equals("")||et_money.getText().toString().equals("")|| et_date.getText().toString().equals("")|| et_way.getText().toString().equals("")||et_type.getText().toString().equals("")) { Toast.makeText(AddActivity.this, "信息不全，请补充", Toast.LENGTH_SHORT).show(); } else{ db.insert(TABLE_NAME,null,values); //注意别漏掉 values.clear(); Toast.makeText(AddActivity.this, "保存成功", Toast.LENGTH_SHORT).show(); et_money.setText("");//保存成功清空信息 et_date.setText(""); et_type.setText(""); et_way.setText(""); } db.close(); } //查询数据 public void queryText() { db=myHelper.getWritableDatabase(); Cursor cursor = db.query(TABLE_NAME,null,null,null,null,null,null); if(cursor.getCount() == 0) { mTvShow.setText(""); Toast.makeText(this,"没有数据",Toast.LENGTH_SHORT).show(); } else{ cursor.moveToFirst(); mTvShow.setText(cursor.getString(1) + " " + cursor.getString(2) + "元 " + cursor.getString(3) +" "+cursor.getString(4)+" "+ cursor.getString(5)); } while(cursor.moveToNext()) { mTvShow.append(" " + cursor.getString(1) + " " + cursor.getString(2) + "元 " + cursor.getString(3) +" "+cursor.getString(4)+" "+ cursor.getString(5)); } cursor.close(); db.close(); } //修改数据 public void updateText() { db=myHelper.getWritableDatabase(); //实例化一个要修改的数据的对象 values=new ContentValues(); values.put("date",date = et_date.getText().toString()); values.put("type",type = et_type.getText().toString()); values.put("way",way = et_way.getText().toString()); //更新并得到行数 db.update(TABLE_NAME,values,"money = ?",new String[]{et_money.getText().toString()}); Toast.makeText(this, "数据修改成功", Toast.LENGTH_SHORT).show(); db.close(); } //删除数据 public void deleteText() { SQLiteDatabase db=myHelper.getWritableDatabase(); int i = db.delete(TABLE_NAME,"money=?",new String[]{et_money.getText().toString()}); if(i !=0 ) { Toast.makeText(this,"删除数据成功",Toast.LENGTH_SHORT).show(); }else { Toast.makeText(this,"删除数据失败",Toast.LENGTH_SHORT).show(); } db.close(); } }
activity_add.xml文件代码：
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:orientation="vertical" 4 android:layout_width="match_parent" 5 android:layout_height="match_parent" 6 android:background="@mipmap/bj_2" 7 > 8 9 <!--标题栏--> 10 <include layout="@layout/titlebar" /> 11 <RadioGroup 12 android:id="@+id/RadioGroup1" 13 android:layout_width="wrap_content" 14 android:layout_height="wrap_content" 15 android:orientation="horizontal" 16 > 17 <RadioButton 18 android:id="@+id/shouru" 19 android:layout_width="wrap_content" 20 android:layout_height="wrap_content" 21 android:text="收 入 " 22 android:textSize="20dp"/> 23 <RadioButton 24 android:id="@+id/zhichu" 25 android:layout_width="wrap_content" 26 android:layout_height="wrap_content" 27 android:text="支 出" 28 android:textSize="20dp"/> 29 </RadioGroup> 30 31 <LinearLayout 32 android:layout_width="wrap_content" 33 android:layout_height="wrap_content" 34 android:orientation="horizontal"> 35 <TextView 36 android:layout_width="wrap_content" 37 android:layout_height="wrap_content" 38 android:text="金额：" 39 android:textSize="20dp" 40 android:height="100px"/> 41 <EditText 42 android:id="@+id/edit_money" 43 android:layout_width="280sp" 44 android:layout_height="wrap_content" 45 android:hint="请输入金额" 46 android:maxLines="1" 47 android:scrollbars="vertical" 48 /> 49 </LinearLayout> 50 <LinearLayout 51 android:layout_width="wrap_content" 52 android:layout_height="wrap_content" 53 android:orientation="horizontal"> 54 <TextView 55 android:layout_width="wrap_content" 56 android:layout_height="wrap_content" 57 android:text="日期：" 58 android:textSize="20dp" 59 android:height="100px"/> 60 <EditText 61 android:id="@+id/edit_date" 62 android:layout_width="280sp" 63 android:layout_height="wrap_content" 64 android:hint="请输入时间" 65 android:maxLines="1" 66 android:scrollbars="vertical" 67 /> 68 </LinearLayout> 69 <LinearLayout 70 android:layout_width="wrap_content" 71 android:layout_height="wrap_content" 72 android:orientation="horizontal"> 73 <TextView 74 android:layout_width="wrap_content" 75 android:layout_height="wrap_content" 76 android:text="类别：" 77 android:textSize="20dp" 78 android:height="100px"/> 79 <EditText 80 android:id="@+id/edit_type" 81 android:layout_width="280sp" 82 android:layout_height="wrap_content" 83 android:hint="请输入类别" 84 android:maxLines="1" 85 android:scrollbars="vertical" 86 /> 87 </LinearLayout> 88 <LinearLayout 89 android:layout_width="wrap_content" 90 android:layout_height="wrap_content" 91 android:orientation="horizontal"> 92 <TextView 93 android:layout_width="wrap_content" 94 android:layout_height="wrap_content" 95 android:text="方式：" 96 android:textSize="20dp" 97 android:height="100px"/> 98 <EditText 99 android:id="@+id/edit_way" 100 android:layout_width="280sp" 101 android:layout_height="wrap_content" 102 android:hint="请输入支付方式" 103 android:maxLines="1" 104 android:scrollbars="vertical" 105 /> 106 </LinearLayout> 107 <LinearLayout 108 android:id="@+id/ld_btn" 109 android:layout_width="match_parent" 110 android:layout_height="wrap_content" 111 android:layout_centerVertical="true" 112 android:orientation="horizontal"> 113 114 <Button 115 android:id="@+id/btn_add" 116 android:layout_width="wrap_content" 117 android:layout_height="wrap_content" 118 android:layout_weight="1" 119 android:textSize="20sp" 120 android:text="添加" /> 121 122 <Button 123 android:id="@+id/btn_update" 124 android:layout_width="wrap_content" 125 android:layout_height="wrap_content" 126 android:layout_weight="1" 127 android:textSize="20sp" 128 android:text="修改" /> 129 130 <Button 131 android:id="@+id/btn_query" 132 android:layout_width="wrap_content" 133 android:layout_height="wrap_content" 134 android:textSize="20sp" 135 android:layout_weight="1" 136 android:text="查询" /> 137 138 <Button 139 android:id="@+id/btn_delete" 140 android:layout_width="wrap_content" 141 android:layout_height="wrap_content" 142 android:layout_weight="1" 143 android:textSize="20sp" 144 android:text="删除" /> 145 </LinearLayout> 146 147 <TextView 148 android:id="@+id/ld_show" 149 android:layout_width="match_parent" 150 android:layout_height="wrap_content" 151 android:layout_marginTop="25dp" 152 android:layout_below="@+id/ld_btn" 153 android:textSize="20sp" /> 154 155 </LinearLayout>
截图展示：
记账：
修改账单信息：
删除账单信息：
