本文实例讲述了Android开发实现的导出数据库到Excel表格功能。分享给大家供大家参考，具体如下： 之前一直在电脑上用Excel表格记录家庭帐单，不久前重装系统不小心干掉了，伤心了好
本文实例讲述了Android开发实现的导出数据库到Excel表格功能。分享给大家供大家参考，具体如下：
之前一直在电脑上用Excel表格记录家庭帐单，不久前重装系统不小心干掉了，伤心了好久，那可是我记了五年的帐单呀！这段时间用的是随手记，好用但是不太符合我的习惯，所以我自己写了一个小小的帐单记录APP，App小到只有一个Activity。当然更多的需求我正在研发中，呵呵！现在已经完成了把每天记录的数据保存到Sqilte数据库中，然后可以导出到excel表格。代码也是借助网上的一些资料写成的，代码也比较容易，只需要用到一个jxl.jar包，感谢网友的帮助。
贴上主要代码，再附上文件包：
MainActivity.java：
package com.ldm.familybill;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Environment;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.ldm.db.DBHelper;
import com.ldm.excel.ExcelUtils;
@SuppressLint("SimpleDateFormat")
public class MainActivity extends Activity implements OnClickListener {
private EditText mFoodEdt;
private EditText mArticlesEdt;
private EditText mTrafficEdt;
private EditText mTravelEdt;
private EditText mClothesEdt;
private EditText mDoctorEdt;
private EditText mRenQingEdt;
private EditText mBabyEdt;
private EditText mLiveEdt;
private EditText mOtherEdt;
private EditText mRemarkEdt;
private Button mSaveBtn;
private File file;
private String[] title = { "日期", "食物支出", "日用品项", "交通话费", "旅游出行", "穿着支出", "医疗保健", "人情客往", "宝宝专项", "房租水电", "其它支出", "备注说明" };
private String[] saveData;
private DBHelper mDbHelper;
private ArrayList<ArrayList<String>>bill2List;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewsById();
mDbHelper = new DBHelper(this);
mDbHelper.open();
bill2List=new ArrayList<ArrayList<String>>();
}
private void findViewsById() {
mFoodEdt = (EditText) findViewById(R.id.family_bill_food_edt);
mArticlesEdt = (EditText) findViewById(R.id.family_bill_articles_edt);
mTrafficEdt = (EditText) findViewById(R.id.family_bill_traffic_edt);
mTravelEdt = (EditText) findViewById(R.id.family_bill_travel_edt);
mClothesEdt = (EditText) findViewById(R.id.family_bill_clothes_edt);
mDoctorEdt = (EditText) findViewById(R.id.family_bill_doctor_edt);
mRenQingEdt = (EditText) findViewById(R.id.family_bill_laiwang_edt);
mBabyEdt = (EditText) findViewById(R.id.family_bill_baby_edt);
mLiveEdt = (EditText) findViewById(R.id.family_bill_live_edt);
mOtherEdt = (EditText) findViewById(R.id.family_bill_other_edt);
mRemarkEdt = (EditText) findViewById(R.id.family_bill_remark_edt);
mSaveBtn = (Button) findViewById(R.id.family_bill_save);
mSaveBtn.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.family_bill_save) {
saveData = new String[] { new SimpleDateFormat("yyyy-MM-dd").format(new Date()), mFoodEdt.getText().toString().trim(), mArticlesEdt.getText().toString().trim(), mTrafficEdt.getText().toString().trim(), mTravelEdt.getText().toString().trim(), mClothesEdt.getText().toString().trim(), mDoctorEdt.getText().toString().trim(), mRenQingEdt.getText().toString().trim(), mBabyEdt.getText().toString().trim(), mLiveEdt.getText().toString().trim(), mOtherEdt.getText().toString().trim(), mRemarkEdt.getText().toString().trim() };
if (canSave(saveData)) {
ContentValues values = new ContentValues();
values.put("time", new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
values.put("food", mFoodEdt.getText().toString());
values.put("use", mArticlesEdt.getText().toString());
values.put("traffic", mTrafficEdt.getText().toString());
values.put("travel", mTravelEdt.getText().toString());
values.put("clothes", mClothesEdt.getText().toString());
values.put("doctor", mDoctorEdt.getText().toString());
values.put("laiwang", mRenQingEdt.getText().toString());
values.put("baby", mBabyEdt.getText().toString());
values.put("live", mLiveEdt.getText().toString());
values.put("other", mOtherEdt.getText().toString());
values.put("remark", mRemarkEdt.getText().toString());
long insert = mDbHelper.insert("family_bill", values);
if (insert > 0) {
initData();
}
}
else {
Toast.makeText(this, "请填写任意一项内容", Toast.LENGTH_SHORT).show();
}
}
}
@SuppressLint("SimpleDateFormat")
public void initData() {
file = new File(getSDPath() + "/Family");
makeDir(file);
ExcelUtils.initExcel(file.toString() + "/bill.xls", title);
ExcelUtils.writeObjListToExcel(getBillData(), getSDPath() + "/Family/bill.xls", this);
}
private ArrayList<ArrayList<String>> getBillData() {
Cursor mCrusor = mDbHelper.exeSql("select * from family_bill");
while (mCrusor.moveToNext()) {
ArrayList<String> beanList=new ArrayList<String>();
beanList.add(mCrusor.getString(1));
beanList.add(mCrusor.getString(2));
beanList.add(mCrusor.getString(3));
beanList.add(mCrusor.getString(4));
beanList.add(mCrusor.getString(5));
beanList.add(mCrusor.getString(6));
beanList.add(mCrusor.getString(7));
beanList.add(mCrusor.getString(8));
beanList.add(mCrusor.getString(9));
beanList.add(mCrusor.getString(10));
beanList.add(mCrusor.getString(11));
beanList.add(mCrusor.getString(12));
bill2List.add(beanList);
}
mCrusor.close();
return bill2List;
}
public static void makeDir(File dir) {
if (!dir.getParentFile().exists()) {
makeDir(dir.getParentFile());
}
dir.mkdir();
}
public String getSDPath() {
File sdDir = null;
boolean sdCardExist = Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
if (sdCardExist) {
sdDir = Environment.getExternalStorageDirectory();
}
String dir = sdDir.toString();
return dir;
}
private boolean canSave(String[] data) {
boolean isOk = false;
for (int i = 0; i < data.length; i++) {
if (i > 0 && i < data.length) {
if (!TextUtils.isEmpty(data[i])) {
isOk = true;
}
}
}
return isOk;
}
}
CreateExcel.java：
package com.ldm.excel;
import java.io.File;
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import android.os.Environment;
public class CreateExcel {
// 准备设置excel工作表的标题
private WritableSheet sheet;
/**创建Excel工作薄*/
private WritableWorkbook wwb;
private String[] title = { "日期", "食物支出", "日用品项", "交通话费", "旅游出行", "穿着支出", "医疗保健", "人情客往", "宝宝专项", "房租水电", "其它支出", "备注说明" };
public CreateExcel() {
excelCreate();
}
public void excelCreate() {
try {
/**输出的excel文件的路径*/
String filePath = Environment.getExternalStorageDirectory() + "/family_bill";
File file = new File(filePath, "bill.xls");
if (!file.exists()) {
file.createNewFile();
}
wwb = Workbook.createWorkbook(file);
/**添加第一个工作表并设置第一个Sheet的名字*/
sheet = wwb.createSheet("家庭帐务表", 0);
}
catch (Exception e) {
e.printStackTrace();
}
}
public void saveDataToExcel(int index, String[] content) throws Exception {
Label label;
for (int i = 0; i < title.length; i++) {
/**Label(x,y,z)其中x代表单元格的第x+1列，第y+1行, 单元格的内容是y
* 在Label对象的子对象中指明单元格的位置和内容
* */
label = new Label(i, 0, title[i]);
/**将定义好的单元格添加到工作表中*/
sheet.addCell(label);
}
/*
* 把数据填充到单元格中
* 需要使用jxl.write.Number
* 路径必须使用其完整路径，否则会出现错误
*/
for (int i = 0; i < title.length; i++) {
Label labeli = new Label(i, index, content[i]);
sheet.addCell(labeli);
}
// 写入数据
wwb.write();
// 关闭文件
wwb.close();
}
}
DBHelper.java：
package com.ldm.db;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class DBHelper extends SQLiteOpenHelper {
public static final String DB_NAME = "ldm_family"; // DB name
private Context mcontext;
private DBHelper mDbHelper;
private SQLiteDatabase db;
public DBHelper(Context context) {
super(context, DB_NAME, null, 11);
this.mcontext = context;
}
public DBHelper(Context context, String name, CursorFactory factory, int version) {
super(context, name, factory, version);
}
/**
* 用户第一次使用软件时调用的操作，用于获取数据库创建语句（SW）,然后创建数据库
*/
@Override
public void onCreate(SQLiteDatabase db) {
String sql = "create table if not exists family_bill(id integer primary key,time text,food text,use text,traffic text,travel text,clothes text,doctor text,laiwang text,baby text,live text,other text,remark text)";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
/* 打开数据库,如果已经打开就使用，否则创建 */
public DBHelper open() {
if (null == mDbHelper) {
mDbHelper = new DBHelper(mcontext);
}
db = mDbHelper.getWritableDatabase();
return this;
}
/* 关闭数据库 */
public void close() {
db.close();
mDbHelper.close();
}
/**添加数据 */
public long insert(String tableName, ContentValues values) {
return db.insert(tableName, null, values);
}
/**查询数据*/
public Cursor findList(String tableName, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy, String limit) {
return db.query(tableName, columns, selection, selectionArgs, groupBy, having, orderBy, limit);
}
public Cursor exeSql(String sql) {
return db.rawQuery(sql, null);
}
}
ExcelUtils.java：
package com.ldm.excel;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import jxl.Workbook;
import jxl.WorkbookSettings;
import jxl.write.Label;
import jxl.write.WritableCell;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import android.content.Context;
import android.widget.Toast;
public class ExcelUtils {
public static WritableFont arial14font = null;
public static WritableCellFormat arial14format = null;
public static WritableFont arial10font = null;
public static WritableCellFormat arial10format = null;
public static WritableFont arial12font = null;
public static WritableCellFormat arial12format = null;
public final static String UTF8_ENCODING = "UTF-8";
public final static String GBK_ENCODING = "GBK";
public static void format() {
try {
arial14font = new WritableFont(WritableFont.ARIAL, 14, WritableFont.BOLD);
arial14font.setColour(jxl.format.Colour.LIGHT_BLUE);
arial14format = new WritableCellFormat(arial14font);
arial14format.setAlignment(jxl.format.Alignment.CENTRE);
arial14format.setBorder(jxl.format.Border.ALL, jxl.format.BorderLineStyle.THIN);
arial14format.setBackground(jxl.format.Colour.VERY_LIGHT_YELLOW);
arial10font = new WritableFont(WritableFont.ARIAL, 10, WritableFont.BOLD);
arial10format = new WritableCellFormat(arial10font);
arial10format.setAlignment(jxl.format.Alignment.CENTRE);
arial10format.setBorder(jxl.format.Border.ALL, jxl.format.BorderLineStyle.THIN);
arial10format.setBackground(jxl.format.Colour.LIGHT_BLUE);
arial12font = new WritableFont(WritableFont.ARIAL, 12);
arial12format = new WritableCellFormat(arial12font);
arial12format.setBorder(jxl.format.Border.ALL, jxl.format.BorderLineStyle.THIN);
}
catch (WriteException e) {
e.printStackTrace();
}
}
public static void initExcel(String fileName, String[] colName) {
format();
WritableWorkbook workbook = null;
try {
File file = new File(fileName);
if (!file.exists()) {
file.createNewFile();
}
workbook = Workbook.createWorkbook(file);
WritableSheet sheet = workbook.createSheet("家庭帐务表", 0);
sheet.addCell((WritableCell) new Label(0, 0, fileName, arial14format));
for (int col = 0; col < colName.length; col++) {
sheet.addCell(new Label(col, 0, colName[col], arial10format));
}
workbook.write();
}
catch (Exception e) {
e.printStackTrace();
}
finally {
if (workbook != null) {
try {
workbook.close();
}
catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
@SuppressWarnings("unchecked")
public static <T> void writeObjListToExcel(List<T> objList, String fileName, Context c) {
if (objList != null && objList.size() > 0) {
WritableWorkbook writebook = null;
InputStream in = null;
try {
WorkbookSettings setEncode = new WorkbookSettings();
setEncode.setEncoding(UTF8_ENCODING);
in = new FileInputStream(new File(fileName));
Workbook workbook = Workbook.getWorkbook(in);
writebook = Workbook.createWorkbook(new File(fileName), workbook);
WritableSheet sheet = writebook.getSheet(0);
for (int j = 0; j < objList.size(); j++) {
ArrayList<String> list=(ArrayList<String>) objList.get(j);
for (int i = 0; i < list.size(); i++) {
sheet.addCell(new Label(i, j+1, list.get(i), arial12format));
}
}
writebook.write();
Toast.makeText(c, "保存成功", Toast.LENGTH_SHORT).show();
}
catch (Exception e) {
e.printStackTrace();
}
finally {
if (writebook != null) {
try {
writebook.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
if (in != null) {
try {
in.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
public static Object getValueByRef(Class cls, String fieldName) {
Object value = null;
fieldName = fieldName.replaceFirst(fieldName.substring(0, 1), fieldName.substring(0, 1).toUpperCase());
String getMethodName = "get" + fieldName;
try {
Method method = cls.getMethod(getMethodName);
value = method.invoke(cls);
}
catch (Exception e) {
e.printStackTrace();
}
return value;
}
}
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