谈中型项目下的编码技巧二
16lz
2021-01-26
良好的代码编写风格，写好的代码几乎不用调试。
方法:
1.适当的用全局变量，如控件，adapter,DB，其他定义的类。
2.多建立initSomething 函数
全局变量如下
public class MainActivity extends Activity { Button sure; EditText login; EditText pws; CheckBox checkButton; LoginDB mydb; ProductDB myProductDB; ToAddrDB myToAddrDB; HistoryDB myHistoryDB; TextView pwstext; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } 初始化全局变量构造一个init()函数来初始话，这样的话一个activity有时候想换布局就容易多了。
而如果要给数据赋值构造一个initData或initDB的函数
/* 展开看接口, * * */package com.sqlitedb;import java.io.File;import com.ProjectClass.Client;import com.ProjectClass.Product;import com.ProjectClass.ToAddr;import com.projectConstant.ProjectConstant;import com.sqtest.R;import android.app.Activity;import android.database.Cursor;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.TextView;public class MainActivity extends Activity { Button sure; EditText login; EditText pws; CheckBox checkButton; LoginDB mydb; ProductDB myProductDB; ToAddrDB myToAddrDB; HistoryDB myHistoryDB; TextView pwstext; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); } public void init(){ sure = (Button)findViewById(R.id.button1); login = (EditText)findViewById(R.id.editText2); pws = (EditText)findViewById(R.id.editText1); checkButton = (CheckBox)findViewById(R.id.checkBox1); pwstext = (TextView)findViewById(R.id.textview1); mydb = new LoginDB(this); myProductDB = new ProductDB(this); myToAddrDB = new ToAddrDB(this); myHistoryDB = new HistoryDB(this); //sure.setOnClickListener(productClick); InitDB(); //sure.setOnClickListener(Clientclick); sure.setOnClickListener(HistoryClick); } public void InitDB(){ markDir(); Product myproductInfo; String tcprices[] = {"30", "20", "15", "30", "90", "50"}; String tcproductNames[] = {"烤鸭", "烤鸡", "烤牛", "烤猪", "烤狗","烤鼠"}; String tcnumbers[] = {"1", "2", "3", "4", "5", "6"}; //String types[] = {"1", "2", "1", "1", "3","2"}; for(int i =0; i < tcprices.length; i++){ myproductInfo = new Product();//必须这样在这里new String price = tcprices[i]; myproductInfo.setProduct("贪吃吧", tcproductNames[i], "null", price, tcnumbers[i]); myProductDB.operateProduct(myproductInfo); //myHistoryDB.operateHProduct("lilin", types[i], myproductInfo); } String kxprices[] = {"30", "20", "15", "30", "90", "50"}; String kxproductNames[] = {"溜冰", "滑雪", "吹牛", "自恋", "遛狗","溜鼠"}; String kxnumbers[] = {"1", "2", "3", "4", "5", "6"}; //String types[] = {"1", "2", "1", "1", "3","2"}; for(int i =0; i < kxprices.length; i++){ myproductInfo = new Product();//必须这样在这里new String price = kxprices[i]; myproductInfo.setProduct("开心吧", kxproductNames[i], "null", price, kxnumbers[i]); myProductDB.operateProduct(myproductInfo); //myHistoryDB.operateHProduct("lilin", types[i], myproductInfo); } String lyprices[] = {"30", "20", "15", "30", "90", "50"}; String lyproductNames[] = {"井冈山", "青原山", "庐山", "泰山", "江郎山","老虎山"}; String lynumbers[] = {"2", "2", "2", "2", "2", "2"}; //String types[] = {"1", "2", "1", "1", "3","2"}; for(int i =0; i < lyprices.length; i++){ myproductInfo = new Product();//必须这样在这里new String price = lyprices[i]; myproductInfo.setProduct("健康吧", lyproductNames[i], "null", price, lynumbers[i]); myProductDB.operateProduct(myproductInfo); //myHistoryDB.operateHProduct("lilin", types[i], myproductInfo); } String tgprices[] = {"30", "20", "15", "30", "90", "50"}; String tgproductNames[] = {"IPhone5", "u8500", "z470", "y480", "诺基亚","诺亚信"}; String tgnumbers[] = {"1", "2", "3", "4", "5", "6"}; //String types[] = {"1", "2", "1", "1", "3","2"}; for(int i =0; i < tgprices.length; i++){ myproductInfo = new Product();//必须这样在这里new String price = tgprices[i]; myproductInfo.setProduct("团购吧", tgproductNames[i], "null", price, tgnumbers[i]); myProductDB.operateProduct(myproductInfo); //myHistoryDB.operateHProduct("lilin", types[i], myproductInfo); } String toName[] = {"老张", "老莫","老吴", "老应", "老周"}; String toAddr[] = {"31栋127", "31栋130", "31栋119", "31栋110", "31栋129"}; String toTel[] = {"18903067930", "18103067930", "18206067930", "18307067430", "18707067430"}; ToAddr myToAddr = new ToAddr(); for(int i = 0; i < 5; i++ ){ myToAddr.setAddrAndTel("lilin", toName[i], toAddr[i], toTel[i],"false", "false"); myToAddrDB.operateToAddrDB(myToAddr); } }} 一些全局变量的使用能减少好多代码。
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