測土配方施肥專家系統

這兩天寫了個小東東， 關於測土的《我不專業啊，數據別人提供的》
主要有看俺代碼吧，

//這個是主activity
package cn.com.itisme.ctsf;

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;

import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import cn.com.itisme.ctsf.dao.SqliteOp;
import cn.com.itisme.ctsf.entity.XiShu;
import cn.com.itisme.ctsf.entity.YangFenXuQiu;

public class MainActivity extends ActionBarActivity {

    private final int OVER_WATER = 0;
    private final int DOT_WATER = 1;
    private Spinner spinnerCrop;
    private Spinner spinnerArea;
    private RadioGroup rbGroup;
    private long purpose;
    private double cantainN;
    private double cantainP;
    private double cantainK;
    private EditText etPurpose;
    private EditText etIncN;
    private EditText etIncP;
    private EditText etIncK;
    private Button btnRecomm;
    private TextView tvN;
    private TextView tvP;
    private TextView tvK;
    private double usageN = 1.0;
    private double usageK = 1.0;
    private double usageP = 1.0;

    DecimalFormat df=new DecimalFormat("######.##");
    private List<XiShu> xiShuLists;
    private List<YangFenXuQiu> lists;
    private List<String> crops = new ArrayList<String>();
    private List<String> areas = new ArrayList<String>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initview();
    }

    private void getDataFile() {
        lists = new ArrayList<YangFenXuQiu>();
        xiShuLists = new ArrayList<XiShu>();
        SqliteOp sqliteOp = new SqliteOp();
        SQLiteDatabase cstfDB = sqliteOp.openDatabase(getApplicationContext());
        if (cstfDB == null) {
            return;
        }
        Cursor cursor = cstfDB.rawQuery("SELECT * from yangfenxuqiu ", null);
        if (cursor == null) {
            return;
        }
        while (cursor.moveToNext()) {
            YangFenXuQiu yfxq = new YangFenXuQiu();
            yfxq.setId(cursor.getInt(cursor.getColumnIndex("id")));
            yfxq.setCropname(cursor.getString(cursor.getColumnIndex("cropname")));
            yfxq.setCroptype(cursor.getString(cursor.getColumnIndex("croptype")));
            yfxq.setGrain(cursor.getString(cursor.getColumnIndex("grain")));
            yfxq.setN(cursor.getDouble(cursor.getColumnIndex("n")));
            yfxq.setP2o5(cursor.getDouble(cursor.getColumnIndex("p2o5")));
            yfxq.setK2o(cursor.getDouble(cursor.getColumnIndex("k2o")));
            lists.add(yfxq);
        }

        Cursor xishuC = cstfDB.rawQuery("SELECT * from xishu", null);
        if (xishuC == null) {
            return;
        }

        while (xishuC.moveToNext()) {
            XiShu xishu = new XiShu();
            xishu.setId(xishuC.getInt(xishuC.getColumnIndex("id")));
            xishu.setQuyu(xishuC.getString(xishuC.getColumnIndex("quyu")));
            xishu.setNx(xishuC.getDouble(xishuC.getColumnIndex("nx")));
            xishu.setNz(xishuC.getDouble(xishuC.getColumnIndex("nz")));
            xishu.setPx(xishuC.getDouble(xishuC.getColumnIndex("px")));
            xishu.setPz(xishuC.getDouble(xishuC.getColumnIndex("pz")));
            xiShuLists.add(xishu);
        }
        cursor.close();
        xishuC.close();
        cstfDB.close();

    }

    private void initview() {

        getDataFile();

        if (lists.size() != 0) {
            for (YangFenXuQiu ya : lists) {
                crops.add(ya.getCropname());
            }
        } else {
            crops.add("無數據");
        }
        if (xiShuLists.size() != 0) {
            for (XiShu xishu : xiShuLists) {
                areas.add(xishu.getQuyu());
            }
        } else {
            areas.add("無數據");
        }

        spinnerCrop = (Spinner) findViewById(R.id.spinnerCrop);
        spinnerArea = (Spinner) findViewById(R.id.spinnerArea);
        ArrayAdapter<String> dataCropsAdapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, crops);
        dataCropsAdapter
                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        ArrayAdapter<String> dataAreaAdapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, areas);
        dataAreaAdapter
                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinnerCrop.setAdapter(dataCropsAdapter);
        spinnerArea.setAdapter(dataAreaAdapter);
        rbGroup = (RadioGroup) findViewById(R.id.radioMethod);
        rbGroup.setSelected(true);
        etIncK = (EditText) findViewById(R.id.etK);
        etIncP = (EditText) findViewById(R.id.etP);
        etIncN = (EditText) findViewById(R.id.etN);
        etPurpose = (EditText) findViewById(R.id.etPurpose);
        tvK = (TextView) findViewById(R.id.tvKDisplay);
        tvN = (TextView) findViewById(R.id.tvNDisplay);
        tvP = (TextView) findViewById(R.id.tvPDisplay);
        btnRecomm = (Button) findViewById(R.id.button);
        btnRecomm.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if(checkDataEmpty()){
                    Toast.makeText(MainActivity.this, "請輸入完數據後獲得推薦", Toast.LENGTH_SHORT).show();
                }else{
                    setUsage();
                    setTvK();
                    setTvN();
                    setTvP();
                }

            }
        });

    }

    private long getItem(Spinner s){
        return s.getSelectedItemId();
    }

    private int getWaterMethod() {

        switch (rbGroup.getCheckedRadioButtonId()) {
        case R.id.rbDot:
            return DOT_WATER;
        case R.id.rbOver:
            return OVER_WATER;

        }
        return DOT_WATER;
    }

    public Long getPurpose() {
        String str = etPurpose.getText().toString().trim();
        purpose = Long.parseLong(str);
        return purpose;
    }

    private double getN() {
        String str = etIncN.getText().toString().trim();
        cantainN = Double.parseDouble(str);
        return cantainN;

    }

    private double getK() {
        String str = etIncK.getText().toString().trim();
        cantainK = Double.parseDouble(str);
        return cantainK;

    }

    private double getP() {
        String str = etIncP.getText().toString().trim();
        cantainP = Double.parseDouble(str);
        return cantainP;

    }

    private boolean checkDataEmpty() {

        if (etIncK.getText().toString().trim() == null
                || etIncK.getText().toString().trim().equals("")
                || etIncN.getText().toString().trim() == null
                || etIncN.getText().toString().trim().equals("")
                || etIncP.getText().toString().trim() == null
                || etIncP.getText().toString().trim().equals("")
                || etPurpose.getText().toString().trim() == null
                || etPurpose.getText().toString().trim().equals("")) {
            return true;
        }
        return false;
    }

    private void setTvN() {
        double results;
        YangFenXuQiu yaFenXuQiu = getYangFenXuQiu();
        results = (yaFenXuQiu.getN() * getPurpose() / 100 - 3.662*getN() * 0.15 * Math.pow(getN(), -0.3843))/usageN ;
        tvN.setText(df.format(results));
    }

    private YangFenXuQiu getYangFenXuQiu() {
        YangFenXuQiu yaFenXuQiu;
        yaFenXuQiu = lists.get((int)getItem(spinnerCrop));
        return yaFenXuQiu;
    }

    private void setTvK() {
        double results;
        YangFenXuQiu yaFenXuQiu = getYangFenXuQiu();
        results = (yaFenXuQiu.getN() * getPurpose() / 100 - getN() * 0.15 )/usageK ;
        tvK.setText(df.format(results));
    }

    private void setTvP() {
        double results;
        YangFenXuQiu yaFenXuQiu = getYangFenXuQiu();
        results = (yaFenXuQiu.getP2o5() * getPurpose() / 100 - 8.473 * getP() * 0.15 * Math.pow(getN(), -0.6745))/usageP ;
        tvP.setText(df.format(results));
    }

    private void setUsage(){
        if(getWaterMethod() == DOT_WATER){
            usageK = 0.55;
            usageN = 0.5;
            usageP = 0.2;
        }else{
            usageK = 0.5;
            usageN = 0.35;
            usageP = 0.1;
        }

    }
    @Override
    public void onBackPressed() {

        super.onBackPressed();
        finish();
    }
    @Override
    protected void onDestroy() {
        finish();
        super.onDestroy();
    }
}

//然後是獲得數據庫的, 這個是用的別人的
package cn.com.itisme.ctsf.dao;

/**
 * Created by play on 2015/4/20.
 */
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.AssetManager;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

/**
 * This is a Assets Database Manager
 * Use it, you can use a assets database file in you application
 * It will copy the database file to "/data/data/[your application package name]/database" when you first time you use it
 * Then you can get a SQLiteDatabase object by the assets database file
 * @author RobinTang
 * @time 2012-09-20
 *
 *
 * How to use:
 * 1. Initialize AssetsDatabaseManager
 * 2. Get AssetsDatabaseManager
 * 3. Get a SQLiteDatabase object through database file
 * 4. Use this database object
 *
 * Using example:
 * AssetsDatabaseManager.initManager(getApplication()); // this method is only need call one time
 * AssetsDatabaseManager mg = AssetsDatabaseManager.getManager();   // get a AssetsDatabaseManager object
 * SQLiteDatabase db1 = mg.getDatabase("db1.db");   // get SQLiteDatabase object, db1.db is a file in assets folder
 * db1.???  // every operate by you want
 * Of cause, you can use AssetsDatabaseManager.getManager().getDatabase("xx") to get a database when you need use a database
 */
public class AssetsDatabaseManager {
    private static String tag = "AssetsDatabase"; // for LogCat
    private static String databasepath = "/data/data/%s/databases"; // %s is packageName


    // A mapping from assets database file to SQLiteDatabase object
    private Map<String, SQLiteDatabase> databases = new HashMap<String, SQLiteDatabase>();

    // Context of application
    private Context context = null;

    // Singleton Pattern
    private static AssetsDatabaseManager mInstance = null;

    /**
     * Initialize AssetsDatabaseManager
     * @param context, context of application
     */
    public static void initManager(Context context){
        if(mInstance == null){
            mInstance = new AssetsDatabaseManager(context);
        }
    }

    /**
     * Get a AssetsDatabaseManager object
     * @return, if success return a AssetsDatabaseManager object, else return null
     */
    public static AssetsDatabaseManager getManager(){
        return mInstance;
    }

    private AssetsDatabaseManager(Context context){
        this.context = context;
    }

    /**
     * Get a assets database, if this database is opened this method is only return a copy of the opened database
     * @param dbfile, the assets file which will be opened for a database
     * @return, if success it return a SQLiteDatabase object else return null
     */
    public SQLiteDatabase getDatabase(String dbfile) {
        if(databases.get(dbfile) != null){
            Log.i(tag, String.format("Return a database copy of %s", dbfile));
            return (SQLiteDatabase) databases.get(dbfile);
        }
        if(context==null)
            return null;

        Log.i(tag, String.format("Create database %s", dbfile));
        String spath = getDatabaseFilepath();
        String sfile = getDatabaseFile(dbfile);

        File file = new File(sfile);
        SharedPreferences dbs = context.getSharedPreferences(AssetsDatabaseManager.class.toString(), 0);
        boolean flag = dbs.getBoolean(dbfile, false); // Get Database file flag, if true means this database file was copied and valid
        if(!flag || !file.exists()){
            file = new File(spath);
            if(!file.exists() && !file.mkdirs()){
                Log.i(tag, "Create \""+spath+"\" fail!");
                return null;
            }
            if(!copyAssetsToFilesystem(dbfile, sfile)){
                Log.i(tag, String.format("Copy %s to %s fail!", dbfile, sfile));
                return null;
            }

            dbs.edit().putBoolean(dbfile, true).commit();
        }

        SQLiteDatabase db = SQLiteDatabase.openDatabase(sfile, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
        if(db != null){
            databases.put(dbfile, db);
        }
        return db;
    }


    private String getDatabaseFilepath(){
        return String.format(databasepath, context.getApplicationInfo().packageName);
    }

    private String getDatabaseFile(String dbfile){
        return getDatabaseFilepath()+"/"+dbfile;
    }

    private boolean copyAssetsToFilesystem(String assetsSrc, String des){
        Log.i(tag, "Copy "+assetsSrc+" to "+des);
        InputStream istream = null;
        OutputStream ostream = null;
        try{
            AssetManager am = context.getAssets();
            istream = am.open(assetsSrc);
            ostream = new FileOutputStream(des);
            byte[] buffer = new byte[1024];
            int length;
            while ((length = istream.read(buffer))>0){
                ostream.write(buffer, 0, length);
            }
            istream.close();
            ostream.close();
        }
        catch(Exception e){
            e.printStackTrace();
            try{
                if(istream!=null)
                    istream.close();
                if(ostream!=null)
                    ostream.close();
            }
            catch(Exception ee){
                ee.printStackTrace();
            }
            return false;
        }
        return true;
    }

    /**
     * Close assets database
     * @param dbfile, the assets file which will be closed soon
     * @return, the status of this operating
     */
    public boolean closeDatabase(String dbfile){
        if(databases.get(dbfile) != null){
            SQLiteDatabase db = (SQLiteDatabase) databases.get(dbfile);
            db.close();
            databases.remove(dbfile);
            return true;
        }
        return false;
    }

    /**
     * Close all assets database
     */
    static public void closeAllDatabase(){
        Log.i(tag, "closeAllDatabase");
        if(mInstance != null){
            for(int i=0; i<mInstance.databases.size(); ++i){
                if(mInstance.databases.get(i)!=null){
                    mInstance.databases.get(i).close();
                }
            }
            mInstance.databases.clear();
        }
    }
}

// 佈局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:gravity="center"
        android:text="測土配方施肥專家系統"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textSize="25sp" />

    <RelativeLayout
        android:id="@+id/inforSetting"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp">

        <TextView
            android:id="@+id/tvInfor"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:gravity="center"
            android:text="種植信息設置"
            android:textSize="20sp" />

        <LinearLayout
            android:id="@+id/linearLayout"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/tvInfor"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="20dp"
            android:orientation="horizontal">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:gravity="center"
                android:text="種植作物" />

            <Spinner
                android:id="@+id/spinnerCrop"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:gravity="center"
                android:text="種植區域" />

            <Spinner
                android:id="@+id/spinnerArea"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

        </LinearLayout>

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_below="@+id/linearLayout"
            android:layout_marginTop="5dp"
            android:text="灌溉方式" />

        <RadioGroup
            android:id="@+id/radioMethod"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/textView2"
            android:layout_marginLeft="50dp">

            <RadioButton
                android:id="@+id/rbDot"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="滴灌" />

            <RadioButton
                android:id="@+id/rbOver"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="淹灌" />
        </RadioGroup>

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/etPurpose"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_below="@+id/radioMethod"
            android:text="目標產量" />

        <EditText
            android:id="@+id/etPurpose"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/radioMethod"
            android:layout_toRightOf="@id/textView3"
            android:ems="10"
            android:inputType="number" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/etPurpose"
            android:layout_below="@+id/radioMethod"
            android:layout_toEndOf="@+id/etPurpose"
            android:layout_toRightOf="@+id/etPurpose"
            android:text="千克/畝" />


    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/basicInfor"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/inforSetting"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp">

        <TextView
            android:id="@+id/tvBasic"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:gravity="center"
            android:text="土壤肥力基礎"
            android:textSize="20sp" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/tvBasic"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:layout_marginTop="10dp"
            android:orientation="horizontal">


            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="含氮量" />

            <EditText
                android:id="@+id/etN"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="含磷量" />

            <EditText
                android:id="@+id/etP"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:id="@+id/textView5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="含鉀量" />

            <EditText
                android:id="@+id/etK"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1" />
        </LinearLayout>
    </RelativeLayout>

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/basicInfor"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:text="獲得推薦"
        android:textSize="20sp" />

    <RelativeLayout
        android:id="@+id/result"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/button"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp">

        <TextView

            android:id="@+id/tvResult"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:gravity="center_horizontal"
            android:text="推薦施肥量"
            android:textSize="20sp" />


        <TextView
            android:id="@+id/tvNlabel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/tvResult"
            android:layout_marginTop="20dp"
            android:text="施氮量"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/tvNDisplay"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/tvNlabel"
            android:layout_below="@+id/tvResult"
            android:layout_marginLeft="5dp"
            android:layout_toRightOf="@+id/tvNlabel" />

        <TextView

            android:id="@+id/tvPlabel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/tvNlabel"
            android:layout_below="@+id/tvResult"
            android:layout_marginLeft="40dp"
            android:layout_marginStart="20dp"
            android:layout_toRightOf="@+id/tvNDisplay"
            android:text="施磷量"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/tvPDisplay"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/tvNlabel"

            android:layout_below="@+id/tvResult"
            android:layout_marginLeft="5dp"
            android:layout_toRightOf="@+id/tvPlabel" />

        <TextView
            android:id="@+id/tvKlebel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/tvNlabel"
            android:layout_marginTop="10dp"
            android:text="施鉀量"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/tvKDisplay"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/tvKlebel"
            android:layout_below="@+id/tvNDisplay"
            android:layout_marginLeft="5dp"
            android:layout_toRightOf="@+id/tvKlebel" />


    </RelativeLayout>


</RelativeLayout>

上面還有 幾個類沒有列， 可以從已有的推出來，我就不寫了哦