Java and xml

A7, StephanosTower,Eachamukku,Kakkanadu,Kochi
Android Application Development Training Tutorial
For more info visit
http://www.zybotech.in

JAVA
AddEmployee
publicclass AddEmployee extendsActivity{
EditText txtName;
EditText txtAge;
TextViewtxtEmps;
DatabaseHelperdbHelper;
SpinnerspinDept;
@Override
public voidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.addemployee);
txtName=(EditText)findViewById(R.id.txtName);
txtAge=(EditText)findViewById(R.id.txtAge);
txtEmps=(TextView)findViewById(R.id.txtEmps);
spinDept=(Spinner)findViewById(R.id.spinDept);
}
@Override
publicvoid onStart()
{
try
{
super.onStart();
dbHelper=newDatabaseHelper(this);
txtEmps.setText(txtEmps.getText()+String.valueOf(dbHelper.getEmployeeCount()));
Cursor c=dbHelper.getAllDepts();

startManagingCursor(c);
//SimpleCursorAdapterca=new SimpleCursorAdapter(this,android.R.layout.simple_spinner_item,c,
new String []{DatabaseHelper.colDeptName},newint[]{android.R.id.text1});
SimpleCursorAdapterca=newSimpleCursorAdapter(this,R.layout.deptspinnerrow,c,newString []
{DatabaseHelper.colDeptName,"_id"},newint[]{R.id.txtDeptName});
//ca.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinDept.setAdapter(ca);
spinDept.setOnItemSelectedListener(newOnItemSelectedListener() {
publicvoid onItemSelected(AdapterView<?>parent,ViewselectedView,
int position,longid) {
// TODO Auto-generatedmethodstub
}
publicvoid onNothingSelected(AdapterView<?>arg0) {
}
});
//never close cursor
}
catch(Exceptionex)
{
CatchError(ex.toString());
}
}
publicvoid btnAddEmp_Click(Viewview)
{

booleanok=true;
try
{
Spannable spn=txtAge.getText();
String name=txtName.getText().toString();
int age=Integer.valueOf(spn.toString());
int deptID=Integer.valueOf((int)spinDept.getSelectedItemId());
Employee emp=newEmployee(name,age,deptID);
dbHelper.AddEmployee(emp);
}
catch(Exceptionex)
{
ok=false;
CatchError(ex.toString());
}
finally
{
if(ok)
{
//NotifyEmpAdded();
Alerts.ShowEmpAddedAlert(this);
txtEmps.setText("Numberofemployees"+String.valueOf(dbHelper.getEmployeeCount()));
}
}
}
void CatchError(String Exception)
{
Dialog diag=newDialog(this);

diag.setTitle("AddnewEmployee");
TextViewtxt=newTextView(this);
txt.setText(Exception);
diag.setContentView(txt);
diag.show();
}
void NotifyEmpAdded()
{
Dialog diag=newDialog(this);
diag.setTitle("AddnewEmployee");
TextViewtxt=newTextView(this);
txt.setText("Employee AddedSuccessfully");
diag.show();
try {
diag.wait(1000);
} catch (InterruptedExceptione) {
// TODO Auto-generatedcatchblock
CatchError(e.toString());
}
diag.notify();
diag.dismiss();
}}
Alerts
publicclass Alerts {
publicstatic voidShowEmpAddedAlert(Contextcon)
{

AlertDialog.Builderbuilder=newAlertDialog.Builder(con);
builder.setTitle("AddnewEmployee");
builder.setIcon(android.R.drawable.ic_dialog_info);
DialogListnerlistner=newDialogListner();
builder.setMessage("Employee Addedsuccessfully");
builder.setPositiveButton("ok",listner);
AlertDialogdiag=builder.create();
diag.show();
}
publicstatic AlertDialogShowEditDialog(final Contextcon,final Employee emp)
{
AlertDialog.Builderb=newAlertDialog.Builder(con);
b.setTitle("Employee Details");
LayoutInflater li=LayoutInflater.from(con);
Viewv=li.inflate(R.layout.editdialog,null);
b.setIcon(android.R.drawable.ic_input_get);
b.setView(v);
final TextViewtxtName=(TextView)v.findViewById(R.id.txtDelName);
final TextViewtxtAge=(TextView)v.findViewById(R.id.txtDelAge);
final Spinnerspin=(Spinner)v.findViewById(R.id.spinDiagDept);
Utilities.ManageDeptSpinner(con,spin);
for(inti=0;i<spin.getCount();i++)
{
long id=spin.getItemIdAtPosition(i);
if(id==emp.getDept())
{
spin.setSelection(i,true);

break;
}
}
txtName.setText(emp.getName());
txtAge.setText(String.valueOf(emp.getAge()));
b.setPositiveButton("Modify",newOnClickListener() {
publicvoid onClick(DialogInterface dialog,intwhich) {
emp.setName(txtName.getText().toString());
emp.setAge(Integer.valueOf(txtAge.getText().toString()));
emp.setDept((int)spin.getItemIdAtPosition(spin.getSelectedItemPosition()));
try
{
DatabaseHelperdb=new DatabaseHelper(con);
db.UpdateEmp(emp);
}
catch(Exceptionex)
{
CatchError(con, ex.toString());
}
}
});
b.setNeutralButton("Delete",new OnClickListener(){
DatabaseHelperdb=new DatabaseHelper(con);

db.DeleteEmp(emp);
}
});
b.setNegativeButton("Cancel",null);
return b.create();
//diag.show();
}
static public voidCatchError(Context con, String Exception)
{
Dialog diag=newDialog(con);
diag.setTitle("Error");
TextViewtxt=newTextView(con);
txt.setText(Exception);
diag.show();
}
}
DatabaseDemo
publicclass DatabaseDemo extendsTabActivity {
GridViewgrid;
TextViewtxtTest;
/** Calledwhenthe activity is first created.*/
@Override
setContentView(R.layout.main);

SetupTabs();
}
@Override
public booleanonCreateOptionsMenu(Menumenu)
{
menu.add(1,1, 1, "Add Employee");
return true;
}
public booleanonOptionsItemSelected(MenuItemitem)
{
switch (item.getItemId())
{
//Add employee
case 1:
Intent addIntent=newIntent(this,AddEmployee.class);
startActivity(addIntent);
break;
}
super.onOptionsItemSelected(item);
return false;
}
void SetupTabs()
{
TabHost host=getTabHost();
TabHost.TabSpec spec=host.newTabSpec("tag1");
Intentin1=new Intent(this,AddEmployee.class);
spec.setIndicator("AddEmployee");
spec.setContent(in1);

TabHost.TabSpec spec2=host.newTabSpec("tag2");
Intentin2=new Intent(this,GridList.class);
spec2.setIndicator("Employees");
spec2.setContent(in2);
host.addTab(spec);
host.addTab(spec2);
}}
DataBaseHelper
publicclass DatabaseHelper extendsSQLiteOpenHelper{
static final String dbName="demoDB";
static final String employeeTable="Employees";
static final String colID="EmployeeID";
static final String colName="EmployeeName";
static final String colAge="Age";
static final String colDept="Dept";
static final String deptTable="Dept";
static final String colDeptID="DeptID";
static final String colDeptName="DeptName";
static final String viewEmps="ViewEmps";
publicDatabaseHelper(Contextcontext) {
super(context,dbName,null,33);
// TODO Auto-generatedconstructorstub
}
@Override
publicvoid onCreate(SQLiteDatabase db) {

db.execSQL("CREATETABLE "+deptTable+" ("+colDeptID+" INTEGER PRIMARY KEY , "+
colDeptName+" TEXT)");
db.execSQL("CREATETABLE "+employeeTable+" ("+colID+" INTEGERPRIMARYKEY AUTOINCREMENT,
"+colName+" TEXT, "+colAge+" Integer,"+colDept+" INTEGERNOT NULL ,FOREIGN KEY ("+colDept+") REFERENCES
"+deptTable+" ("+colDeptID+"));");
db.execSQL("CREATETRIGGERfk_empdept_deptid" + " BEFORE INSERT "+" ON"+employeeTable+" FOR
EACH ROW BEGIN"+" SELECT CASE WHEN ((SELECT "+colDeptID+" FROM "+deptTable+" WHERE
"+colDeptID+"=new."+colDept+" ) ISNULL)"+" THEN RAISE (ABORT,'ForeignKeyViolation') END;"+ " END;");
db.execSQL("CREATEVIEW "+viewEmps+" ASSELECT "+employeeTable+"."+colID+" AS_id,"+
" "+employeeTable+"."+colName+","+ " "+employeeTable+"."+colAge+","+"
"+deptTable+"."+colDeptName+""+" FROM"+employeeTable+" JOIN"+deptTable+" ON
"+employeeTable+"."+colDept+" ="+deptTable+"."+colDeptID );
//Inserts pre-defineddepartments
InsertDepts(db);
}
@Override
publicvoid onUpgrade(SQLiteDatabase db,int oldVersion,intnewVersion) {
db.execSQL("DROPTABLE IF EXISTS "+employeeTable);
db.execSQL("DROPTABLE IF EXISTS "+deptTable);
db.execSQL("DROPTRIGGERIF EXISTS dept_id_trigger");
db.execSQL("DROPTRIGGERIF EXISTS dept_id_trigger22");
db.execSQL("DROPTRIGGERIF EXISTS fk_empdept_deptid");
db.execSQL("DROPVIEW IFEXISTS "+viewEmps);
onCreate(db);
}
void AddEmployee(Employee emp)
{
SQLiteDatabase db= this.getWritableDatabase();

ContentValuescv=newContentValues();
cv.put(colName,emp.getName());
cv.put(colAge, emp.getAge());
cv.put(colDept,emp.getDept());
//cv.put(colDept,2);
db.insert(employeeTable,colName,cv);
db.close();
}
int getEmployeeCount()
{
SQLiteDatabase db=this.getWritableDatabase();
Cursor cur= db.rawQuery("Select*from "+employeeTable,null);
int x= cur.getCount();
cur.close();
return x;
}
Cursor getAllEmployees()
{
//Cursor cur= db.rawQuery("Select"+colID+" as_id , "+colName+","+colAge+" from
"+employeeTable,newString[]{});
Cursor cur= db.rawQuery("SELECT * FROM "+viewEmps,null);
return cur;
}
Cursor getAllDepts()

{
SQLiteDatabase db=this.getReadableDatabase();
Cursor cur=db.rawQuery("SELECT "+colDeptID+" as _id, "+colDeptName+" from"+deptTable,new
String [] {});
return cur;
}
void InsertDepts(SQLiteDatabase db)
{
cv.put(colDeptID,1);
cv.put(colDeptName, "Sales");
db.insert(deptTable,colDeptID,cv);
cv.put(colDeptName,"IT");
cv.put(colDeptName,"HR");
}
publicString GetDept(intID)
{
String[]params=new String[]{String.valueOf(ID)};
Cursor c=db.rawQuery("SELECT "+colDeptName+" FROM"+deptTable+" WHERE
"+colDeptID+"=?",params);
c.moveToFirst();

int index=c.getColumnIndex(colDeptName);
return c.getString(index);
}
publicCursor getEmpByDept(StringDept)
{
String [] columns=newString[]{"_id",colName,colAge,colDeptName};
Cursor c=db.query(viewEmps,columns,colDeptName+"=?",newString[]{Dept},null, null,null);
return c;
}
public intGetDeptID(StringDept)
{
Cursor c=db.query(deptTable,newString[]{colDeptID+" as _id",colDeptName},colDeptName+"=?",
new String[]{Dept},null,null,null);
//Cursor c=db.rawQuery("SELECT "+colDeptID+" as _id FROM "+deptTable+" WHERE
"+colDeptName+"=?",newString[]{Dept});
c.moveToFirst();
return c.getInt(c.getColumnIndex("_id"));
}
publicint UpdateEmp(Employee emp)
{
cv.put(colName,emp.getName());
cv.put(colAge,emp.getAge());
cv.put(colDept,emp.getDept());
return db.update(employeeTable,cv,colID+"=?",newString []{String.valueOf(emp.getID())});

}
publicvoid DeleteEmp(Employee emp)
{
db.delete(employeeTable,colID+"=?",newString[]{String.valueOf(emp.getID())});
db.close();}}
DialogListener
publicclass DialogListnerimplementsandroid.content.DialogInterface.OnClickListener{
publicDialogListner()
{
}
} }
Employee
publicclass Employee {
int _id;
String _name;
int _age;
int _dept;
publicEmployee(StringName,intAge,intDept)
{
this._name=Name;
this._age=Age;
this._dept=Dept;

}
publicEmployee(StringName,intAge)
{
this._name=Name;
this._age=Age;
}
publicint getID()
{
return this._id;
}
publicvoid SetID(intID)
{
this._id=ID;
}
publicString getName()
{
return this._name;
}
publicint getAge()
{
return this._age;
}
publicvoid setName(StringName)
{
this._name=Name;
}
publicvoid setAge(intAge)
{

this._age=Age;
}
publicvoid setDept(intDept)
{
this._dept=Dept;
}
publicString getDeptName(Contextcon,intDept)
{
return newDatabaseHelper(con).GetDept(Dept);
}
publicint getDept()
{
return this._dept;
}
}
GridList
publicclass GridListextendsActivity {
static public GridViewgrid;
TextViewtxtTest;
SpinnerspinDept1;
/** Calledwhenthe activity is first created.*/
@Override
setContentView(R.layout.gridview);
grid=(GridView)findViewById(R.id.grid);

txtTest=(TextView)findViewById(R.id.txtTest);
spinDept1=(Spinner)findViewById(R.id.spinDept1);
Utilities.ManageDeptSpinner(this.getParent(),spinDept1);
final DatabaseHelperdb=new DatabaseHelper(this);
try
{
spinDept1.setOnItemSelectedListener(newOnItemSelectedListener() {
publicvoid onItemSelected(AdapterView<?>arg0,Viewarg1,
int arg2, longarg3) {
LoadGrid();
//sca.notifyDataSetChanged();
}
publicvoid onNothingSelected(AdapterView<?>arg0) {
}
});
}
catch(Exceptionex)
{
txtTest.setText(ex.toString());
}
try
{
grid.setOnItemClickListener(newOnItemClickListener()
{
publicvoid onItemClick(AdapterView<?>parent,Viewv,int position,

long id) {
try
{
SQLiteCursorcr=(SQLiteCursor)parent.getItemAtPosition(position);
String name= cr.getString(cr.getColumnIndex(DatabaseHelper.colName));
int age=cr.getInt(cr.getColumnIndex(DatabaseHelper.colAge));
String Dept= cr.getString(cr.getColumnIndex(DatabaseHelper.colDeptName));
Employee emp=newEmployee(name,age,db.GetDeptID(Dept));
emp.SetID((int)id);
AlertDialogdiag= Alerts.ShowEditDialog(GridList.this,emp);
diag.setOnDismissListener(newOnDismissListener() {
publicvoid onDismiss(DialogInterface dialog) {
txtTest.setText("dismissed");
//((SimpleCursorAdapter)grid.getAdapter()).notifyDataSetChanged();
LoadGrid();
}
});
diag.show();
}
catch(Exceptionex)
{
Alerts.CatchError(GridList.this,ex.toString());
}
}

});
}
catch(Exceptionex)
{
}
}
@Override
public voidonStart()
{
super.onStart();
//LoadGrid();
}
public voidLoadGrid()
{
dbHelper=newDatabaseHelper(this);
try
{
//Cursor c=dbHelper.getAllEmployees();
Viewv=spinDept1.getSelectedView();
TextViewtxt=(TextView)v.findViewById(R.id.txtDeptName);
String Dept=String.valueOf(txt.getText());
Cursor c=dbHelper.getEmpByDept(Dept);
startManagingCursor(c);
String [] from=newString
[]{DatabaseHelper.colName,DatabaseHelper.colAge,DatabaseHelper.colDeptName};
int [] to=new int[] {R.id.colName,R.id.colAge,R.id.colDept};
SimpleCursorAdaptersca=newSimpleCursorAdapter(this,R.layout.gridrow,c,from,to);

grid.setAdapter(sca);
}
catch(Exceptionex)
{
AlertDialog.Builderb=newAlertDialog.Builder(this);
b.setMessage(ex.toString());
b.show();
}
} }
Utilities
publicclass Utilities{
static public voidManageDeptSpinner(Contextcontext,Spinnerview)
{
DatabaseHelperdbHelper=newDatabaseHelper(context);
Cursor c=dbHelper.getAllDepts();
//context.startManagingCursor(c);
//SimpleCursorAdapterca=new SimpleCursorAdapter(this,android.R.layout.simple_spinner_item,c,new
String [] {DatabaseHelper.colDeptName},newint[]{android.R.id.text1});
SimpleCursorAdapterca=newSimpleCursorAdapter(context,R.layout.deptspinnerrow,c,newString []
{DatabaseHelper.colDeptName,"_id"},newint[]{R.id.txtDeptName});
view.setAdapter(ca); } }

XML
AddEmployee
<?xml version="1.0" encoding="utf-8" ?>
- <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height ="wrap_content">
- <LinearLayout android:layout_width="fill_parent" android:layout_height ="wrap_content"
android:orientation="vertical">
<TextView android:layout_width="wrap_content" android:layout_height ="wrap_content"
android:text="Employee Name" />
<EditText android:layout_width="fill_parent" android:layout_height ="fill_parent"
android:id="@+id/txtName" android:autoText="false" />
android:text="Employee Age" />
<EditText android:layout_width="fill_parent" android:layout_height ="fill_parent"
android:id="@+id/txtAge" android:inputType="number" android:digits="0123456789"
android:singleLine="true" />
android:text="Employee Dept" />
<Spinner android:layout_width="fill_parent" android:layout_height ="fill_parent"
android:id="@+id/spinDept" />
<Button android:layout_width="wrap_content" android:layout_height ="wrap_content"
android:id="@+id/btnAdd" android:text="Add Employee" android:onClick="btnAddEmp_Click" />
android:text="Number of employees" android:id="@+id/txtEmps" />
</LinearLayout >
</ScrollView>
editdialog
- <TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height ="wrap_content"
android:orientation="vertical">
- <TableRow>
<TextView android:layout_width="fill_parent" android:layout_height ="wrap_content"
android:text="Name:" />
<EditText android:layout_width="fill_parent" android:layout_height ="wrap_content"
android:id="@+id/txtDelName" />
</TableRow>
- <TableRow>
android:text="Age:" />
<EditText android:layout_width="fill_parent" android:layout_height ="wrap_content"
android:id="@+id/txtDelAge" />
</TableRow>
- <TableRow>
<Spinner android:layout_width="fill_parent" android:layout_height ="wrap_content"
android:id="@+id/spinDiagDept" android:layout_span="2" />
</TableRow>
<TableRow />
</TableLayout>

Deptspinnerrow
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content" android:layout_height ="wrap_content">
android:id="@+id/txtDeptName" android:textColor="#000" />
android:id="@+id/txtDeptID" android:textColor="#000" />
</LinearLayout >
Gridrow
- <TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent">
- <TableRow>
<TextView android:layout_width="50px" android:layout_height ="wrap_content"
android:id="@+id/colName" android:padding="5px" android:layout_weight ="1" />
android:id="@+id/colAge" android:padding="5px" android:layout_weight="1" />
android:id="@+id/colDept" android:padding="5px" android:layout_weight ="1" />
</TableRow>
</TableLayout>
Gridview
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height ="wrap_content" android:id="@+id/tab1">
- <TableLayout android:layout_width="fill_parent" android:layout_height ="fill_parent">
- <TableRow>
<Spinner android:layout_width="fill_parent" android:layout_height ="fill_parent"
android:id="@+id/spinDept1" android:layout_span="3" />
</TableRow>
- <TableRow>
<TextView android:layout_width="fill_parent" android:layout_height ="fill_parent"
android:text="Employee Name" android:layout_weight ="1" />
android:text="Employee Age" android:layout_weight="1" />
android:text="Department" android:layout_weight ="1" />
</TableRow>
</TableLayout>
<GridView android:id="@+id/grid" android:layout_width="fill_parent"
android:layout_height ="fill_parent" android:numColumns="1" android:stretchMode="columnWidth"
/>
android:text="Employee Age" android:id="@+id/txtTest" />
</LinearLayout >

listview
android:layout_width="wrap_content" android:layout_height ="wrap_content">
<ListView android:id="@+id/listEmps" android:layout_width="fill_parent"
android:layout_height ="fill_parent" android:text="A semi-random button" />
android:text="@string/hello" android:id="@+id/txt" />
</LinearLayout >
Main
- <TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height ="fill_parent"
android:id="@android:id/tabhost">
<TabWidget android:layout_width="fill_parent" android:layout_height ="wrap_content"
android:id="@android:id/tabs" />
<FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent"
android:layout_height ="fill_parent" android:paddingTop="60px" />
</TabHost>

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