• 第一阶段个人冲刺博客第八天


    因为要和项目对接,所以今天修改了查询界面,并完成了查询功能的核心代码,下面附上代码。数据库连接出现了问题,准备明天解决。

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/Main"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        android:background="#FFFFFF">
        <Spinner
            android:id="@+id/province"
            android:layout_width="fill_parent"
            android:layout_height="45px"
            android:layout_marginLeft="75px"
            android:layout_marginRight="20px"
            android:layout_marginTop="7px"
            android:drawSelectorOnTop="true"
            android:layout_alignParentRight="true" />
        <Spinner android:id="@+id/city"
            android:layout_width="fill_parent"
            android:layout_height="45px"
            android:layout_marginLeft="75px"
            android:layout_marginRight="20px"
            android:layout_marginTop="3px"
            android:drawSelectorOnTop="true"
            android:layout_alignParentRight="true"
            android:layout_below="@id/province" />
        <Button
            android:id="@+id/SearchFloor"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
    
            <TableLayout
                android:id="@+id/BuildingTable"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
            </TableLayout>
    
        </ScrollView>
    
    </LinearLayout>
    

      

    package com.example.superman.test;
    
    import android.app.Activity;
    import android.content.Context;
    import android.database.Cursor;
    import android.database.sqlite.SQLiteDatabase;
    import android.os.Bundle;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.Button;
    import android.widget.Spinner;
    import android.widget.TableLayout;
    import android.widget.TableRow;
    import android.widget.TextView;
    import android.widget.Toast;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.util.ArrayList;
    
    public class SearchEmptyClassroom extends Activity {
        private String[] teaching_building = new String[] {"基教", "第一教学楼","第二教学楼"};
        private String[] default_floor = new String[]{"一楼","二楼","三楼","四楼","五楼","六楼"};
        private String[][] floor = new String[][]{{"一楼","二楼","三楼","四楼","五楼","六楼"},{"一楼","二楼","三楼","四楼"},{"一楼","二楼","三楼","四楼","五楼"}};
        private Spinner sp;
        private Spinner sp2;
        private Context context;
        private String Building;
        private String Floor;
        private Button SearchFloor;
        private final int WC = ViewGroup.LayoutParams.WRAP_CONTENT;
        private final int MP = ViewGroup.LayoutParams.MATCH_PARENT;
        private TableLayout tableLayout;
    
        ArrayAdapter<String> adapter ;
    
        ArrayAdapter<String> adapter2;
    
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.searchemptyclassroom);
            context = this;
            SearchFloor=findViewById(R.id.SearchFloor);
            SearchFloor.setOnClickListener(SearchFloorListener);
    
    
            adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, teaching_building);
            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            sp = findViewById(R.id.province);
            sp.setAdapter(adapter);
            sp.setOnItemSelectedListener(selectListener1);
    
            adapter2 = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, default_floor);
            adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            sp2 = (Spinner) findViewById(R.id.city);
            sp2.setAdapter(adapter2);
            sp2.setOnItemSelectedListener(selectListener2);
    
        }
    
        private AdapterView.OnItemSelectedListener selectListener1 = new AdapterView.OnItemSelectedListener(){
            public void onItemSelected(AdapterView parent, View v, int position, long id){
                int pos = sp.getSelectedItemPosition();
                Building=sp.getSelectedItem().toString();
                Toast.makeText(SearchEmptyClassroom.this,"当前选中的教学楼是"+Building,Toast.LENGTH_SHORT).show();
                adapter2 = new ArrayAdapter<String>(context,android.R.layout.simple_spinner_item, floor[pos]);
                sp2.setAdapter(adapter2);
            }
            public void onNothingSelected(AdapterView arg0){
            }
    
        };
        private AdapterView.OnItemSelectedListener selectListener2=new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                Floor=sp2.getSelectedItem().toString();
                Toast.makeText(SearchEmptyClassroom.this,"当前选中的教学楼是"+Floor,Toast.LENGTH_SHORT).show();
            }
    
            @Override
            public void onNothingSelected(AdapterView<?> parent) {
    
            }
        };
        private View.OnClickListener SearchFloorListener=new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                GetDATA();
            }
        };
        public void GetDATA()
        {
            // com.test.db 是程序的包名,请根据自己的程序调整
            // /data/data/com.test.db/
            // databases 目录是准备放 SQLite 数据库的地方,也是 Android 程序默认的数据库存储目录
            // 数据库名为 test.db
            String DB_PATH = "/data/data/com.example.superman.test/databases/";
            String DB_NAME = "course.db";
    
            // 检查 SQLite 数据库文件是否存在
            if ((new File(DB_PATH + DB_NAME)).exists() == false) {
                // 如 SQLite 数据库文件不存在,再检查一下 database 目录是否存在
                File f = new File(DB_PATH);
                // 如 database 目录不存在,新建该目录
                if (!f.exists()) {
                    f.mkdir();
                }
    
                try {
                    // 得到 assets 目录下我们实现准备好的 SQLite 数据库作为输入流
                    //InputStream is = getBaseContext().getAssets().open(DB_NAME);
    
                    InputStream is = getBaseContext().getResources().openRawResource(R.raw.course);
                    // 输出流
                    OutputStream os = new FileOutputStream(DB_PATH + DB_NAME);
    
                    // 文件写入
                    byte[] buffer = new byte[1024];
                    int length;
                    while ((length = is.read(buffer)) > 0) {
                        os.write(buffer, 0, length);
                    }
    
                    // 关闭文件流
                    os.flush();
                    os.close();
                    is.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            test(DB_PATH,DB_NAME);
        }
        public void test(String DB_PATH,String DB_NAME)
        {
            // 下面测试 /data/data/com.test.db/databases/ 下的数据库是否能正常工作
            SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase(DB_PATH + DB_NAME, null);
            Cursor cursor = database.rawQuery("select * from course where teacher='基教'", null);
            ArrayList<JavaBean> list=new ArrayList<JavaBean>();
            if(cursor.moveToFirst())
            {
                do{
                    String name=cursor.getString(cursor.getColumnIndex("name"));
                    String teacher=cursor.getString(cursor.getColumnIndex("teacher"));
                    double price=cursor.getDouble(cursor.getColumnIndex("price"));
                    list.add(new JavaBean(name,teacher,price));
                }while (cursor.moveToNext());
            }
    //        if (cursor.getCount() > 0) {
    //            cursor.moveToFirst();
    //            try {
    //                // 解决中文乱码问题
    //                byte test[] = cursor.getBlob(0);
    //                String strtest = new String(test, "utf-8").trim();
    //                // 看输出的信息是否正确
    //                Log.d("是否能够查找到本地数据库的信息",strtest);
    //                System.out.println(strtest);
    //            } catch (UnsupportedEncodingException e) {
    //                // TODO Auto-generated catch block
    //                e.printStackTrace();
    //            }
    //        }
            cursor.close();
    
            ArrayList<String> arrayList=new ArrayList<String>();
            String string=null;
            for(int i=0;i<list.size();i++)
            {
                string=list.get(i).getName()+"-"+list.get(i).getTeacher()+"-"+list.get(i).getPrice();
                arrayList.add(string);
            }
            tableLayout=findViewById(R.id.BuildingTable);
    
            //清除表格所有行
            tableLayout.removeAllViews();
            //全部列自动填充空白处
            tableLayout.setStretchAllColumns(true);
            for(int i=0;i<arrayList.size();i++)
            {
                TableRow tableRow=new TableRow(this);
                //tv用于显示
                TextView tv=new TextView(this);
                tv.setHeight(300);
                tv.setText(arrayList.get(i).toString());
                tableRow.addView(tv);
                tableLayout.addView(tableRow, new TableLayout.LayoutParams(MP, WC,1));
    
            }
        }
    
    }
    

      

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  • 原文地址:https://www.cnblogs.com/cuijunfeng/p/10939912.html
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