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;@Overrideprotected 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;@Overrideprotected 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newString 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newString 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newString 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newString 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。