【最后的冲刺】android中excel表的导入和数据处理
【最后的冲刺】android中excel表的导入和数据处理 ——学校课程的查询和修改
1.编写 The Class类把课程表courses.db当做一个实体类，hashcode和equals这两个类是为了判断输入的查询内容和Excel表中的内容是否一致。
并在java里面区别两个对象是否一致
public class TheClass {
private String classname;
private String type;
private String teacher;
private String classroom;
public String getClassname() {
return classname;
}
public void setClassname(String classname) {
this.classname = classname;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getTeacher() {
return teacher;
}
public void setTeacher(String teacher) {
this.teacher = teacher;
}
public String getClassroom() {
return classroom;
}
public void setClassroom(String classroom) {
this.classroom = classroom;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result
+ ((classname == null) ? 0 : classname.hashCode());
result = prime * result
+ ((classroom == null) ? 0 : classroom.hashCode());
result = prime * result + ((teacher == null) ? 0 : teacher.hashCode());
result = prime * result + ((type == null) ? 0 : type.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
TheClass other = (TheClass) obj;
if (classname == null) {
if (other.classname != null)
return false;
} else if (!classname.equals(other.classname))
return false;
if (classroom == null) {
if (other.classroom != null)
return false;
} else if (!classroom.equals(other.classroom))
return false;
if (teacher == null) {
if (other.teacher != null)
return false;
} else if (!teacher.equals(other.teacher))
return false;
if (type == null) {
if (other.type != null)
return false;
} else if (!type.equals(other.type))
return false;
return true;
}
}
这里必须注意的是hashset是个集合，必须两者是不同的，那么怎么进行区分呢，就是通过hashcode和equals这两个类
2.编写Readfile类，导入Excle的类进入sqlite
public class ReadFile {
public static boolean read2DB(File f, Context con) {
try {
Workbook course = null;
course = Workbook.getWorkbook(f);
Sheet sheet = course.getSheet(0);
HashSet<TheClass> subjects = new HashSet<TheClass>();
Cell cell = null;
for (int i = 1; i < sheet.getRows(); i++) {
TheClass tc = new TheClass();
cell = sheet.getCell(2, i);
tc.setClassname(cell.getContents());
cell = sheet.getCell(10, i);
tc.setType(cell.getContents());
cell = sheet.getCell(12, i);
tc.setTeacher(cell.getContents());
cell = sheet.getCell(18, i);
tc.setClassroom(cell.getContents());
System.out.println(tc.getClassname() + tc.getType()
+ tc.getTeacher() + tc.getClassroom());
subjects.add(tc);
}
SQLiteDatabase db = new SQLiteHelper(con, "courses.db")
.getWritableDatabase();
for (TheClass tc : subjects) {
ContentValues cv = new ContentValues();
cv.put("classname", tc.getClassname());
cv.put("type", tc.getType());
cv.put("teacher", tc.getTeacher());
cv.put("classroom", tc.getClassroom());
db.insert("table1", null, cv);
}
return true;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
}
}
3.编写sqlite帮助类，通过它可以比较快的创建数据对象，创建表，删除表
public class SQLiteHelper extends SQLiteOpenHelper {
public SQLiteHelper(Context context, String name, CursorFactory factory,
int version) {
super(context, name, factory, version);
}
public SQLiteHelper(Context con, String name){
this(con, name, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("create table table1(classname varchar(20), type varchar(10), teacher varchar(20), classroom varchar(20))");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldv, int newv) {
// TODO Auto-generated method stub
db.execSQL("drop table if exists table1");
onCreate(db);
}
}
4.编写主函数MainActivity，添加查询课程，老师，修改教室，老师等点击事件，还有刚开始加载Excel表的数据
public class MainActivity extends Activity {
private TextView hello;
private Button b1;
private EditText et;
// private Spinner sp;
private EditText et2;
private SQLiteDatabase db = null;
private TextView type;
private TextView classroom;
private Button editclassroom;
private Button del;
private String classname;
private String teachername;
private EditText edclassroom;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
db = new SQLiteHelper(this, "courses.db").getWritableDatabase();
hello = (TextView) findViewById(R.id.hello);
b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
LayoutInflater li = LayoutInflater.from(MainActivity.this);
View view = li.inflate(R.layout.quer, null);
et = (EditText) view.findViewById(R.id.editText1);
// sp = (Spinner) findViewById(R.id.spinner1);
et2 = (EditText) view.findViewById(R.id.EditText01);
new AlertDialog.Builder(MainActivity.this)
.setTitle("查询")
.setView(view)
.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0,
int arg1) {
classname = et.getText().toString();
teachername = et2.getText().toString();
if (null != classname
&& null != teachername) {
Cursor c = db
.rawQuery(
"select type,classroom from table1 where classname = ? and teacher = ? ",
new String[] {
classname,
teachername });
LayoutInflater li = LayoutInflater
.from(MainActivity.this);
View view = li.inflate(
R.layout.show, null);
type = (TextView) view
.findViewById(R.id.type);
classroom = (TextView) view
.findViewById(R.id.classroom);
editclassroom = (Button) view
.findViewById(R.id.button1);
del = (Button) view
.findViewById(R.id.button2);
c.moveToNext();
type.setText(c.getString(c
.getColumnIndex("type")));
classroom.setText(c.getString(c
.getColumnIndex("classroom")));
new AlertDialog.Builder(
MainActivity.this)
.setTitle("查询结果")
.setView(view)
.setPositiveButton("确定",
null).show();
editclassroom
.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(
View arg0) {
LayoutInflater li = LayoutInflater
.from(MainActivity.this);
View editview = li
.inflate(
R.layout.editclassroom,
null);
edclassroom = (EditText) editview
.findViewById(R.id.editText1);
new AlertDialog.Builder(
MainActivity.this)
.setTitle(
"新的教室：")
.setView(
editview)
.setPositiveButton(
"确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
ContentValues cv = new ContentValues();
cv.put("classroom", edclassroom.getText().toString());
db.update("table1", cv, "classname = ? and teacher = ?",
new String[] {
classname,
teachername });
}
})
.setNegativeButton(
"取消",
null)
.show();
}
});
del.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
new AlertDialog.Builder(
MainActivity.this)
.setTitle("警告")
.setMessage(
"您正在删除记录，确定删除？")
.setPositiveButton(
"确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(
DialogInterface arg0,
int arg1) {
db.delete(
"table1",
"classname = ? and teacher = ?",
new String[] {
classname,
teachername });
}
})
.setNegativeButton(
"取消", null)
.show();
}
});
}
}
}).show();
}
});
File sdpath = Environment.getExternalStorageDirectory();
File coursefile = new File(sdpath + File.separator + "courses.xls");
if (!coursefile.exists()) {
new AlertDialog.Builder(this).setTitle("错误").setMessage("未找到文件")
.setPositiveButton("确定", null).show();
b1.setVisibility(View.INVISIBLE);
} else {
hello.setText("找到了文件！");
new Important().execute();
b1.setVisibility(View.VISIBLE);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
class Important extends AsyncTask<Integer, String, Boolean> {
private ProgressDialog pDialog = null;
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("正在导入课程，请稍候");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected void onPostExecute(Boolean imp) {
// TODO Auto-generated method stub
super.onPostExecute(imp);
pDialog.dismiss();
String result = "";
if (imp == true) {
result = "读取成功!";
} else {
result = "读取失败！";
}
new AlertDialog.Builder(MainActivity.this).setTitle("提示")
.setMessage(result).setPositiveButton("确定", null).show();
}
@Override
protected void onProgressUpdate(String... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}
@Override
protected Boolean doInBackground(Integer... params) {
File sdpath = Environment.getExternalStorageDirectory();
File coursefile = new File(sdpath + File.separator + "courses.xls");
return ReadFile.read2DB(coursefile, MainActivity.this);
}
}
}
5.总结一下
整个过程不是太难，不过要记得导入jxl.jar这个包，整体技术方面就是用到了安卓本身自带的Sqlite操作方法
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