安卓学习记录（四）——体温表APP

1.新建project

file->new->new project，选择Basic Activity

2.在content_main.xml中添加一个List View

1 <ListView
2         android:id="@+id/lv_main"
3         android:layout_width="wrap_content"
4         android:layout_height="wrap_content" />

3.绘制一个页面来展示数据（list_item.xml）

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="80dp"
 5     android:orientation="vertical">
 6
 7     <TextView
 8         android:id="@+id/tv_name"
 9         android:layout_width="150dp"
10         android:layout_height="80dp"
11         android:layout_marginLeft="10dp"
12         android:layout_alignParentLeft="true"
13         android:gravity="center"
14         android:singleLine="true"
15         android:textSize="35sp"
16         android:text="姓名"
17         android:ellipsize="marquee" />
18
19     <TextView
20         android:id="@+id/tv_date"
21         android:layout_width="wrap_content"
22         android:layout_height="80dp"
23         android:layout_toRightOf="@+id/tv_name"
24         android:layout_marginLeft="15dp"
25         android:textSize="20sp"
26         android:gravity="center"
27         android:text="日期"/>
28
29     <TextView
30         android:id="@+id/tv_bodyTem"
31         android:layout_width="wrap_content"
32         android:layout_height="80dp"
33         android:text="体温"
34         android:textSize="30sp"
35         android:layout_marginRight="20dp"
36         android:layout_alignParentRight="true"
37         android:gravity="center"/>
38
39
40 </RelativeLayout>

4.Bean存储

 1 package com.example.tem;
 2
 3 import java.io.Serializable;
 4
 5 public class TemBean implements Serializable{
 6
 7     public String name;
 8     public String date;
 9     public String bodyTem;
10
11     @Override
12     public String toString() {
13         return "TemBean{" +
14                 "name='" + name + '\'' +
15                 ", date='" + date + '\'' +
16                 ", bodyTem='" + bodyTem + '\'' +
17                 '}';
18     }
19
20     public String getName() {
21         return name;
22     }
23
24     public void setName(String name) {
25         this.name = name;
26     }
27
28     public String getDate() {
29         return date;
30     }
31
32     public void setDate(String date) {
33         this.date = date;
34     }
35
36     public String getBodyTem() {
37         return bodyTem;
38     }
39
40     public void setBodyTem(String bodyTem) {
41         this.bodyTem = bodyTem;
42     }
43
44 }

5.编写适配器（什么是适配器“https://blog.csdn.net/geekmubai/article/details/89297238”）

 1 package com.example.tem;
 2
 3 import android.content.Context;
 4 import android.view.LayoutInflater;
 5 import android.view.View;
 6 import android.view.ViewGroup;
 7 import android.widget.BaseAdapter;
 8 import android.widget.TextView;
 9
10 import java.util.List;
11
12 public class TemListAdapter extends BaseAdapter{
13     private List<TemBean> mlist;
14     private Context mContext;
15     private LayoutInflater mlayoutInflater;
16     public TemListAdapter(Context context, List<TemBean> list){
17         mContext=context;
18         mlist=list;
19         mlayoutInflater=LayoutInflater.from(context);
20     }
21     @Override
22     public int getCount() {
23         return mlist.size();
24     }
25
26     @Override
27     public Object getItem(int position) {
28         return mlist.get(position);
29     }
30
31     @Override
32     public long getItemId(int position) {
33         return position;
34     }
35
36     @Override
37     public View getView(int position, View convertView, ViewGroup parent) {
38         ViewHolder viewHolder;
39         if(convertView==null)
40         {
41             viewHolder=new ViewHolder();
42             convertView=mlayoutInflater.inflate(R.layout.list_item,null);
43             viewHolder.mTvName=convertView.findViewById(R.id.tv_name);
44             viewHolder.mTvDate=convertView.findViewById(R.id.tv_date);
45             viewHolder.mTvBodyTem=convertView.findViewById(R.id.tv_bodyTem);
46             convertView.setTag(viewHolder);
47         }else{
48             viewHolder=(ViewHolder) convertView.getTag();
49         }
50         TemBean bean=mlist.get(position);
51         viewHolder.mTvName.setText(bean.name);
52         viewHolder.mTvDate.setText(bean.date);
53         viewHolder.mTvBodyTem.setText(bean.bodyTem);
54         return convertView;
55     }
56
57     private static class ViewHolder{
58         public TextView mTvName;
59         public TextView mTvDate;
60         public TextView mTvBodyTem;
61     }
62 }

6.建立数据库

 1 package com.example.tem;
 2
 3 import android.content.ContentValues;
 4 import android.content.Context;
 5 import android.database.Cursor;
 6 import android.database.sqlite.SQLiteDatabase;
 7 import android.database.sqlite.SQLiteOpenHelper;
 8
 9 import androidx.annotation.Nullable;
10
11 public class DatabaseHelper extends SQLiteOpenHelper {
12     public static final String NAME = "name";
13     public static final String DATE = "date";
14     public static final String BODYTEM = "bodytem";
15     public static final String TemPost = "tempost";//数据表名
16
17     public DatabaseHelper(@Nullable Context context) {
18         super(context, "temperature", null, 1);//数据库名
19     }
20
21     @Override
22     public void onCreate(SQLiteDatabase db) {
23         db.execSQL("create table if not exists TemPost("+
24                 "id integer primary key, "+
25                 "name varchar, "+
26                 "date varchar, "+
27                 "bodytem varchar)");
28     }
29     public void insertTem(TemBean TemBean){//增
30         SQLiteDatabase database=getWritableDatabase();
31         ContentValues cv=new ContentValues();
32         cv.put(NAME,TemBean.name);
33         cv.put(DATE,TemBean.date);
34         cv.put(BODYTEM,TemBean.bodyTem);
35         database.insert(TemPost,null,cv);
36     }
37     public Cursor getAllTemData(){//查
38         SQLiteDatabase database=getWritableDatabase();
39         return database.query("TemPost",null,null,null,null,null,"DATE"+" ASC");
40     }
41     public void deleteAllData(){//删
42         SQLiteDatabase database=getWritableDatabase();
43         database.delete("TemPost",null,null);
44     }
45
46     @Override
47     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
48     }
49
50 }

7.使用fab图标的click弹出填写界面，先做界面（new_tem_data.xml）

 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:gravity="center">
 7
 8     <EditText
 9         android:id="@+id/et_tem_name"
10         android:layout_width="match_parent"
11         android:layout_height="wrap_content"
12         android:layout_margin="4dp"
13         android:hint="姓名"/>
14
15     <EditText
16         android:id="@+id/et_tem_bodytem"
17         android:layout_width="match_parent"
18         android:layout_height="wrap_content"
19         android:layout_margin="4dp"
20         android:hint="体温"/>
21     <DatePicker
22         android:id="@+id/dp_tem_date"
23         android:layout_width="wrap_content"
24         android:layout_height="wrap_content"
25         android:layout_margin="4dp"
26         android:datePickerMode="spinner"
27         android:calendarViewShown="false"/>
28
29 </LinearLayout>

8.更改MainActivity中的onClick方法

  1 package com.example.tem;
  2
  3 import android.content.DialogInterface;
  4 import android.content.Intent;
  5 import android.database.Cursor;
  6 import android.os.Bundle;
  7
  8 import com.google.android.material.floatingactionbutton.FloatingActionButton;
  9 import com.google.android.material.snackbar.Snackbar;
 10
 11 import androidx.appcompat.app.AlertDialog;
 12 import androidx.appcompat.app.AppCompatActivity;
 13 import androidx.appcompat.widget.Toolbar;
 14
 15 import android.os.Parcelable;
 16 import android.view.LayoutInflater;
 17 import android.view.View;
 18 import android.view.Menu;
 19 import android.view.MenuItem;
 20 import android.widget.DatePicker;
 21 import android.widget.EditText;
 22 import android.widget.ListView;
 23
 24 import java.io.Serializable;
 25 import java.util.ArrayList;
 26 import java.util.List;
 27
 28 public class MainActivity extends AppCompatActivity {
 29     private List<TemBean> mTemBeanList;
 30     private DatabaseHelper mdatabaseHelper;
 31     private TemListAdapter mAdapter;
 32
 33     @Override
 34     protected void onCreate(Bundle savedInstanceState) {
 35         super.onCreate(savedInstanceState);
 36         setContentView(R.layout.activity_main);
 37         Toolbar toolbar = findViewById(R.id.toolbar);
 38         setSupportActionBar(toolbar);
 39
 40
 41         mdatabaseHelper=new DatabaseHelper(this);
 42         mTemBeanList=new ArrayList<>();
 43         ListView temList=(ListView)findViewById(R.id.lv_main);
 44         initTemData();
 45         mAdapter = new TemListAdapter(this,mTemBeanList);
 46         temList.setAdapter(mAdapter);
 47
 48         FloatingActionButton fab = findViewById(R.id.fab);
 49         fab.setOnClickListener(new View.OnClickListener() {
 50             @Override
 51             public void onClick(View view) {
 52                 AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
 53                 LayoutInflater inflater=LayoutInflater.from(MainActivity.this);
 54                 View viewDialog=inflater.inflate(R.layout.new_tem_data,null);
 55                 final EditText name=(EditText) viewDialog.findViewById(R.id.et_tem_name);
 56                 final EditText bodytem=(EditText)viewDialog.findViewById(R.id.et_tem_bodytem);
 57                 final DatePicker date=(DatePicker) viewDialog.findViewById(R.id.dp_tem_date);
 58                 builder.setView(viewDialog);
 59                 builder.setTitle("填写体温");
 60                 builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
 61                     @Override
 62                     public void onClick(DialogInterface dialog, int which) {
 63                         TemBean temBean=new TemBean();
 64                         temBean.name=name.getText().toString();
 65                         temBean.bodyTem=bodytem.getText().toString();
 66                         temBean.date=date.getYear()+"-"+(date.getMonth()+1)+"-"+date.getDayOfMonth();
 67                         mdatabaseHelper.insertTem(temBean);
 68                         mTemBeanList.add(temBean);
 69                         mAdapter.notifyDataSetChanged();
 70                     }
 71                 });
 72                 builder.setNegativeButton("Cancel",null);//点击取消
 73                 builder.create().show();//显示dialog的布局
 74             }
 75         });
 76     }
 77
 78     private void initTemData() {
 79         Cursor cursor=mdatabaseHelper.getAllTemData();
 80         if(cursor!=null){
 81             while(cursor.moveToNext()){
 82                 TemBean temBean1=new TemBean();
 83                 temBean1.name=cursor.getString(cursor.getColumnIndex("name"));
 84                 temBean1.date=cursor.getString(cursor.getColumnIndex("date"));
 85                 temBean1.bodyTem=cursor.getString(cursor.getColumnIndex("bodytem"));
 86                 mTemBeanList.add(temBean1);
 87             }
 88             cursor.close();
 89         }
 90     }
 91
 92     @Override
 93     public boolean onCreateOptionsMenu(Menu menu) {
 94         // Inflate the menu; this adds items to the action bar if it is present.
 95         getMenuInflater().inflate(R.menu.menu_main, menu);
 96         return true;
 97     }
 98
 99     @Override
100     public boolean onOptionsItemSelected(MenuItem item) {
101         // Handle action bar item clicks here. The action bar will
102         // automatically handle clicks on the Home/Up button, so long
103         // as you specify a parent activity in AndroidManifest.xml.
104         int id = item.getItemId();
105
106         //noinspection SimplifiableIfStatement
107         if (id == R.id.action_settings) {
108             return true;
109         }
110
111         return super.onOptionsItemSelected(item);
112     }
113 }

MainActivity.java

完成

效果图：