I have currently created a simple tcp socket client application that sends and receives messages from a dotnet server application I have created. The application itself actually works however there are a few things I would like to know if they are possible or not. Also this is my first ever droid application and my first ever java application so I am sure there is a better way to do what I have written so please go easy on me.
The problem that I am having is I need a way to monitor the status of the socket so that if the connection gets dropped whether it is from the server application ending or a network drop that the android client would disconnect and put a notification on the screen letting me know. Currently if I end the server application nothign happens on the client and it acts like the connection is still open. Granted this is probably due to the way I have it written so I am looking for samples or suggestions on how to change this so I can monitor this. Any help would be great. Eventually this will be put into a much larger project for my home but I am starting off small so I can do it correctly the first time rather than having someing messy later on.
My code is listed below.
Thanks
KJ
Source:
package com.kkearney.tcp1;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class TCPClient1Activity extends Activity {
public static final int BUFFER_SIZE = 2048;
private Socket sck = null;
private PrintWriter out = null;
private BufferedReader in = null;
Button btnSend;
Button btnConnect;
Button btnDisconnect;
EditText textOut;
TextView textIn;
String response = "";
final Handler handler = new Handler();
final Runnable updateUI = new Runnable() {
public void run() {
textIn.setText(response);
}
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
textOut = (EditText)findViewById(R.id.txtSend);
textIn = (TextView)findViewById(R.id.txtMSG);
btnSend = (Button)findViewById(R.id.btnSend);
btnConnect = (Button)findViewById(R.id.btnConnect);
btnDisconnect = (Button)findViewById(R.id.btnDisconnect);
}
public void ConnectUp(View view){
OpenConnection();
}
public void OpenConnection(){
new Thread(new Runnable(){
public void run(){
try{
if (sck == null){
sck = new Socket("10.0.0.135",8080);
sck.setKeepAlive(true);
screenConfig();
in = new BufferedReader(new InputStreamReader(sck.getInputStream()));
out = new PrintWriter(sck.getOutputStream());
sendDataWithString("testing 1 2 3");
int charsRead = 0;
char[] buffer = new char[BUFFER_SIZE];
while ((charsRead = in.read(buffer)) != -1) {
response += new String(buffer).substring(0, charsRead);
handler.post( updateUI );
}
screenConfig();
}
}
catch (IOException e) {
System.out.print(e+"");
}
catch (Exception e) {
System.out.print(e+"");
}
}
}).start();
}
public void screenConfig(){
if (sck.isClosed() == false){
textOut.setClickable(true);
btnSend.setClickable(true);
btnDisconnect.setClickable(true);
btnConnect.setClickable(false);
}else{
textOut.setClickable(false);
btnSend.setClickable(false);
btnDisconnect.setClickable(false);
btnConnect.setClickable(true);
}
}
public void SendMessage(View view){
sendDataWithString(textOut.getText().toString());
textOut.setText(null);
}
public void DisConnect(View view){
CloseConnection();
}
public void CloseConnection(){
if (sck != null) {
try {
sck.close();
screenConfig();
} catch (IOException e) {
e.printStackTrace();
} finally {
sck = null;
}
}
}
public void sendDataWithString(String message) {
if (message != null && sck != null) {
out.write(message);
out.flush();
}
}
}
So I've decided to to teach myself how to program for android and have a general understanding for java. Well i decided to borrow someones code from the internet and utilize it to assist in creating my first quiz app. I am getting some errors in this code and was wondering if anyone would be so kind to assist me. Thanks
Code:
package com.danyluk.MedicStudyGuide;
import java.io.IOException;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
public class Quiz extends Activity{
/** Called when the activity is first created. */
private RadioButton radioButton;
private TextView quizQuestion;
private TextView tvScore;
private int rowIndex = 1;
private static int score=0;
private int questNo=0;
private boolean checked=false;
private boolean flag=true;
private RadioGroup radioGroup;
String[] corrAns = new String[5];
final DataBaseHelper db = new DataBaseHelper(this);
Cursor c1;
Cursor c2;
Cursor c3;
int counter=1;
String label;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.quiz);
String options[] = new String[19];
// get reference to radio group in layout
RadioGroup radiogroup = (RadioGroup) findViewById(R.id.rdbGp1);
// layout params to use when adding each radio button
LinearLayout.LayoutParams layoutParams = new RadioGroup.LayoutParams(
RadioGroup.LayoutParams.WRAP_CONTENT,
RadioGroup.LayoutParams.WRAP_CONTENT);
try {
db.createDataBase();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
c3 = db.getCorrAns();
tvScore = (TextView) findViewById(R.id.tvScore);
for (int i=0;i<=4;i++)
{
corrAns[i]=c3.getString(0);
c3.moveToNext();
}
RadioGroup radioGroup = (RadioGroup) findViewById(R.id.rdbGp1);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
for(int i=0;;){
RadioButton btn = (RadioButton) radioGroup.getChildAt(i);
String text;
if (btn.isPressed() && btn.isChecked() && questNo < 5)
{
Log.e("corrAns[questNo]",corrAns[questNo]);
if (corrAns[questNo].equals(btn.getText()) && flag==true)
{
score++;
flag=false;
checked = true;
}
else if(checked==true)
{
score--;
flag=true;
checked = false;
}
}
}
tvScore.setText = ("Score: " + Integer.toString(score) + "/5");
Log.e("Score:", Integer.toString(score));
}
});
quizQuestion = (TextView) findViewById(R.id.TextView01);
displayQuestion();
/*Displays the next options and sets listener on next button*/
Button btnNext = (Button) findViewById(R.id.btnNext);
btnNext.setOnClickListener(btnNext_Listener);
/*Saves the selected values in the database on the save button*/
Button btnSave = (Button) findViewById(R.id.btnSave);
btnSave.setOnClickListener(btnSave_Listener);
}
/*Called when next button is clicked*/
private View.OnClickListener btnNext_Listener= new View.OnClickListener() {
@Override
public void onClick(View v) {
flag=true;
checked = false;
questNo++;
if (questNo < 5)
{
c1.moveToNext();
displayQuestion();
}
}
};
/*Called when save button is clicked*/
private View.OnClickListener btnSave_Listener= new View.OnClickListener() {
@Override
public void onClick(View v) {
}
};
private void displayQuestion()
{
//Fetching data quiz data and incrementing on each click
c1=db.getQuiz_Content(rowIndex);
c2 =db.getAns(rowIndex++);
quizQuestion.setText(c1.getString(0));
radioGroup.removeAllViews();
for (int i=0;i<=3;i++)
{
//Generating and adding 4 radio buttons dynamically
radioButton = new RadioButton(this);
radioButton.setText(c2.getString(0));
radioButton.setId(i);
c2.moveToNext();
radioGroup.addView(radioButton);
}
}}}
You forgot give us the error that you get
Hi
I'm build an android application using WebNMS library that apply snmp get operation on router but the result is null and this is the error message
"Error Sending PDU. IO error sending PDU. Send Error: null"
this is my code :
Code:
package com.example.snmptst;
import com.adventnet.snmp.beans.SnmpTarget;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SnmpTarget target;
String targetHost;
int targetPort;
String community;
int timeout;
int retries;
String returnString = null;
targetHost = "192.168.1.1";
targetPort = 161;
community = "public";
timeout = 5000;
retries = 2;
// Use an SNMP target bean to perform SNMP operations
target = new SnmpTarget();
target.setTargetHost(targetHost); // set the agent hostname
if(community != null) { // set the community if specified
target.setCommunity(community);
}
target.setTargetPort(targetPort); // set the port, default is 161
// set the timeout/retries parameters, default are 5 and 0
target.setTimeout(timeout);
target.setRetries(retries);
// Create oidList array from the obtained arrayList
String []oidList = new String[1];
oidList[0]=".1.3.6.1.2.1.1.5.0";
// Set the OID List on the SnmpTarget instance
target.setObjectIDList(oidList);
String[] result = target.snmpGetList(); // do a get request
// Return the result/error from the response.
if(result != null) {
String successString = "Response received. Values:\n"; //No I18N
for(int k=0; k<result.length; k++) {
successString = successString + target.getObjectID(k) + " : " + result[k] + "\n"; //No I18N
}
returnString = successString;
} else {
String errorString = "Request Failed or Timed-out. \n"; //No I18N
errorString = errorString + target.getErrorString();
returnString = errorString;
}
Toast.makeText(getApplicationContext(), returnString, Toast.LENGTH_LONG).show();
}
@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;
}
}
Any one can help me?
Thanks.
Hi there
I am trying to Run google Map on Android Emulator But Map is Not Working.I mean Google Map is displaying in Fragment But there is Not any Markers that I place in My Code.
This is My activity class
Java:
double mLatitude=0;
double mLongitude=0;
private GoogleMap map;
Spinner mSprPlaceType;
String[] mPlaceType=null;
String[] mPlaceTypeName=null;
[user=5448622]@Suppress[/user]Lint("NewApi")
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_places1);
// Array of place types
mPlaceType = getResources().getStringArray(R.array.place_type);
// Array of place type names
mPlaceTypeName = getResources().getStringArray(R.array.place_type_name);
// Creating an array adapter with an array of Place types
// to populate the spinner
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, mPlaceTypeName);
// Getting reference to the Spinner
mSprPlaceType = (Spinner) findViewById(R.id.spr_place_type);
// Setting adapter on Spinner to set place types
mSprPlaceType.setAdapter(adapter);
Button btnFind;
// Getting reference to Find Button
btnFind = ( Button ) findViewById(R.id.button1);
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
dialog.show();
}
else
{
map=((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
map.setMyLocationEnabled(true);
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location From GPS
Location location = locationManager.getLastKnownLocation(provider);
if(location!=null){
onLocationChanged(location);
}
locationManager.requestLocationUpdates(provider, 20000, 0, this);
// Setting click event lister for the find button
btnFind.setOnClickListener(new OnClickListener() {
[user=439709]@override[/user]
public void onClick(View v) {
int selectedPosition = mSprPlaceType.getSelectedItemPosition();
String type = mPlaceType[selectedPosition];
StringBuilder sb = new StringBuilder("https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
sb.append("location="+mLatitude+","+mLongitude);
sb.append("&radius=10000");
sb.append("&types="+type);
sb.append("&sensor=true");
sb.append("&key=AIzaSyCba6q28XzWhcq5wPaB7ek7HWqh3Sq2Q3A");
// Creating a new non-ui thread task to download json data
PlacesTask placesTask = new PlacesTask();
// Invokes the "doInBackground()" method of the class PlaceTask
placesTask.execute(sb.toString());
}
});
}
}
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
urlConnection.disconnect();
}
return data;
}
/** A class, to download Google Places */
private class PlacesTask extends AsyncTask<String, Integer, String>{
String data = null;
// Invoked by execute() method of this object
[user=439709]@override[/user]
protected String doInBackground(String... url) {
try{
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
// Executed after the complete execution of doInBackground() method
[user=439709]@override[/user]
protected void onPostExecute(String result){
ParserTask parserTask = new ParserTask();
// Start parsing the Google places in JSON format
// Invokes the "doInBackground()" method of the class ParseTask
parserTask.execute(result);
}
}
/** A class to parse the Google Places in JSON format */
private class ParserTask extends AsyncTask<String, Integer, List<HashMap<String,String>>>{
JSONObject jObject;
// Invoked by execute() method of this object
[user=439709]@override[/user]
protected List<HashMap<String,String>> doInBackground(String... jsonData) {
List<HashMap<String, String>> places = null;
PlaceJSONParser placeJsonParser = new PlaceJSONParser();
try{
jObject = new JSONObject(jsonData[0]);
/** Getting the parsed data as a List construct */
places = placeJsonParser.parse(jObject);
}catch(Exception e){
Log.d("Exception",e.toString());
}
return places;
}
// Executed after the complete execution of doInBackground() method
[user=439709]@override[/user]
protected void onPostExecute(List<HashMap<String,String>> list){
// Clears all the existing markers
map.clear();
for(int i=0;i<list.size();i++){
// Creating a marker
MarkerOptions markerOptions = new MarkerOptions();
// Getting a place from the places list
HashMap<String, String> hmPlace = list.get(i);
// Getting latitude of the place
double lat = Double.parseDouble(hmPlace.get("lat"));
// Getting longitude of the place
double lng = Double.parseDouble(hmPlace.get("lng"));
// Getting name
String name = hmPlace.get("place_name");
// Getting vicinity
String vicinity = hmPlace.get("vicinity");
LatLng latLng = new LatLng(lat, lng);
// Setting the position for the marker
markerOptions.position(latLng);
// Setting the title for the marker.
//This will be displayed on taping the marker
markerOptions.title(name + " : " + vicinity);
// Placing a marker on the touched position
map.addMarker(markerOptions);
}
}
}
[user=439709]@override[/user]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.show_places1, menu);
return true;
}
[user=439709]@override[/user]
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
[user=439709]@override[/user]
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
mLatitude=location.getLatitude();
mLongitude=location.getLongitude();
LatLng latLng = new LatLng(mLatitude, mLongitude);
map.moveCamera(CameraUpdateFactory.newLatLng(latLng));
map.animateCamera(CameraUpdateFactory.zoomTo(12));
}
[user=439709]@override[/user]
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
[user=439709]@override[/user]
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
[user=439709]@override[/user]
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
}
And This is My Emulator Defination
Phone_Test2
Nexus S(4.0,480*800hdpi)
Google API(x86 System Image)
Intel Atomx86
HVGA
RAM:500MB
VM Heap:16
Internal Storage:200
SD Card:50
Click to expand...
Click to collapse
I have added all Jars and Permisiion in Manifest.Application is Working fine on Android Powerd Mobile Phone But Not on Android Emulator
any guess?
Thanks
Hey all, i want to make an android app which presents a form which sends the data inserted in a database when the submit button is pressed..im a newbie but i think i ve got some progress here. i present my code:
package com.example.marialena.practice;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.ArrayList;
import java.util.List;
public class DatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "contactsManager";
// Contacts table name
private static final String TABLE_CONTACTS = "contacts";
// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_LAST_NAME = "last_name";
private static final String KEY_ORIGIN = "origin";
public DatabaseHandler(Context context) {super(context, DATABASE_NAME, null, DATABASE_VERSION);}
// Creating Tables
@override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_LAST_NAME + " TEXT," + KEY_ORIGIN + "TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
// Upgrading database
@override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);
// Create tables again
onCreate(db);
}
// Adding new contact
public void addContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.getName()); // Contact Name
values.put(KEY_LAST_NAME, contact.getLastName()); // Contact last Name
values.put(KEY_ORIGIN, contact.getOrigin()); // Contact Origin
// Inserting Row
db.insert(TABLE_CONTACTS, null, values);
db.close(); // Closing database connection
}
// Getting single contact
Contact getContact(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
KEY_NAME, KEY_LAST_NAME, KEY_ORIGIN }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null);
if (cursor != null) cursor.moveToFirst();
Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2),cursor.getString(3));
// return contact
return contact;
}
// Getting All Contacts
public List<Contact> getAllContacts() {
List<Contact> contactList = new ArrayList<Contact>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Contact contact = new Contact();
contact.setID(Integer.parseInt(cursor.getString(0)));
contact.setName(cursor.getString(1));
contact.setLastName(cursor.getString(2));
contact.setOrigin(cursor.getString(3));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
// return contact list
return contactList;
}
// Updating single contact
public int updateContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.getName());
values.put(KEY_LAST_NAME, contact.getLastName());
values.put(KEY_ORIGIN, contact.getOrigin());
// updating row
return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
new String[] { String.valueOf(contact.getID()) });
}
// Deleting single contact
public void deleteContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_CONTACTS, KEY_ID + " = ?", new String[] { String.valueOf(contact.getID()) });
db.close();
}
// Getting contacts Count
public int getContactsCount() {
String countQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
DisplayMessageActivity.java
package com.example.marialena.practice;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import android.widget.TextView;
import java.util.List;
public class DisplayMessageActivity extends MyActivity {
@override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
//receiving data
Intent intent = getIntent();
//manipulating message extraction and thank u message.
String message = "Thank You!";
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
setContentView(textView);
DatabaseHandler db = new DatabaseHandler(this);
/**
* CRUD Operations
* */
// Inserting Contacts
Log.d("Insert: ", "Inserting ..");
db.addContact(new Contact("Ravi", "Alonso","HollowStr"));
// Reading all contacts
Log.d("Reading: ", "Reading all contacts..");
List<Contact> contacts = db.getAllContacts();
for (Contact cn : contacts) {
String log = "Id: "+cn.getID()+" ,Name: " + cn.getName() + " ,Last Name: " + cn.getLastName() + " ,Origin: " + cn.getOrigin();
// Writing Contacts to log
Log.d("Name: ", log);
}
}
@override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
MyActivity.java
package com.example.marialena.practice;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
public class MyActivity extends ActionBarActivity {
public final static String EXTRA_MESSAGE = "com.example.marialena.practice.MESSAGE";
@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
}
@override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_my, menu);
return true;
}
@override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.name);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
/* Intent intent2 = new Intent(this, DisplayMessageActivity.class);
EditText editText2 = (EditText) findViewById(R.id.last);
String message2 = editText2.getText().toString();
intent2.putExtra(EXTRA_MESSAGE, message2);
startActivity(intent2);*/
}
}
CONTACT.JAVA
package com.example.marialena.practice;
/**
* Created by Marialena on 7/31/2015.
*/
public class Contact {
//private variables
int _id;
String _name;
String _last_name;
String _origin;
//empty constructor
public Contact(){}
//constructor plus ID
public Contact(int id,String name, String last_name, String origin){
this._id=id;
this._last_name=last_name;
this._name=name;
this._origin=origin;
}
//constructor simple
public Contact(String name, String last_name, String origin){
this._origin=origin;
this._name=name;
this._last_name=last_name;
}
// getting ID
public int getID(){
return this._id;
}
// setting id
public void setID(int id){
this._id = id;
}
// getting name
public String getName(){
return this._name;
}
// setting name
public void setName(String name){
this._name = name;
}
// getting last name
public String getLastName(){
return this._last_name;
}
// setting last name
public void setLastName(String last_name){
this._last_name = last_name;
}
// getting origin
public String getOrigin(){
return this._origin;
}
// setting origin
public void setOrigin(String origin){
this._origin = origin;
}
}
nikoc03 said:
Hey all, i want to make an android app which presents a form which sends the data inserted in a database when the submit button is pressed..im a newbie but i think i ve got some progress here. i present my code:
package com.example.marialena.practice;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.ArrayList;
import java.util.List;
public class DatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "contactsManager";
// Contacts table name
private static final String TABLE_CONTACTS = "contacts";
// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_LAST_NAME = "last_name";
private static final String KEY_ORIGIN = "origin";
public DatabaseHandler(Context context) {super(context, DATABASE_NAME, null, DATABASE_VERSION);}
// Creating Tables
@override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_LAST_NAME + " TEXT," + KEY_ORIGIN + "TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
// Upgrading database
@override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);
// Create tables again
onCreate(db);
}
// Adding new contact
public void addContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.getName()); // Contact Name
values.put(KEY_LAST_NAME, contact.getLastName()); // Contact last Name
values.put(KEY_ORIGIN, contact.getOrigin()); // Contact Origin
// Inserting Row
db.insert(TABLE_CONTACTS, null, values);
db.close(); // Closing database connection
}
// Getting single contact
Contact getContact(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
KEY_NAME, KEY_LAST_NAME, KEY_ORIGIN }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null);
if (cursor != null) cursor.moveToFirst();
Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2),cursor.getString(3));
// return contact
return contact;
}
// Getting All Contacts
public List<Contact> getAllContacts() {
List<Contact> contactList = new ArrayList<Contact>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Contact contact = new Contact();
contact.setID(Integer.parseInt(cursor.getString(0)));
contact.setName(cursor.getString(1));
contact.setLastName(cursor.getString(2));
contact.setOrigin(cursor.getString(3));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
// return contact list
return contactList;
}
// Updating single contact
public int updateContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.getName());
values.put(KEY_LAST_NAME, contact.getLastName());
values.put(KEY_ORIGIN, contact.getOrigin());
// updating row
return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
new String[] { String.valueOf(contact.getID()) });
}
// Deleting single contact
public void deleteContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_CONTACTS, KEY_ID + " = ?", new String[] { String.valueOf(contact.getID()) });
db.close();
}
// Getting contacts Count
public int getContactsCount() {
String countQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
DisplayMessageActivity.java
package com.example.marialena.practice;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import android.widget.TextView;
import java.util.List;
public class DisplayMessageActivity extends MyActivity {
@override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
//receiving data
Intent intent = getIntent();
//manipulating message extraction and thank u message.
String message = "Thank You!";
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
setContentView(textView);
DatabaseHandler db = new DatabaseHandler(this);
/**
* CRUD Operations
* */
// Inserting Contacts
Log.d("Insert: ", "Inserting ..");
db.addContact(new Contact("Ravi", "Alonso","HollowStr"));
// Reading all contacts
Log.d("Reading: ", "Reading all contacts..");
List<Contact> contacts = db.getAllContacts();
for (Contact cn : contacts) {
String log = "Id: "+cn.getID()+" ,Name: " + cn.getName() + " ,Last Name: " + cn.getLastName() + " ,Origin: " + cn.getOrigin();
// Writing Contacts to log
Log.d("Name: ", log);
}
}
@override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
MyActivity.java
package com.example.marialena.practice;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
public class MyActivity extends ActionBarActivity {
public final static String EXTRA_MESSAGE = "com.example.marialena.practice.MESSAGE";
@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
}
@override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_my, menu);
return true;
}
@override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.name);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
/* Intent intent2 = new Intent(this, DisplayMessageActivity.class);
EditText editText2 = (EditText) findViewById(R.id.last);
String message2 = editText2.getText().toString();
intent2.putExtra(EXTRA_MESSAGE, message2);
startActivity(intent2);*/
}
}
CONTACT.JAVA
package com.example.marialena.practice;
/**
* Created by Marialena on 7/31/2015.
*/
public class Contact {
//private variables
int _id;
String _name;
String _last_name;
String _origin;
//empty constructor
public Contact(){}
//constructor plus ID
public Contact(int id,String name, String last_name, String origin){
this._id=id;
this._last_name=last_name;
this._name=name;
this._origin=origin;
}
//constructor simple
public Contact(String name, String last_name, String origin){
this._origin=origin;
this._name=name;
this._last_name=last_name;
}
// getting ID
public int getID(){
return this._id;
}
// setting id
public void setID(int id){
this._id = id;
}
// getting name
public String getName(){
return this._name;
}
// setting name
public void setName(String name){
this._name = name;
}
// getting last name
public String getLastName(){
return this._last_name;
}
// setting last name
public void setLastName(String last_name){
this._last_name = last_name;
}
// getting origin
public String getOrigin(){
return this._origin;
}
// setting origin
public void setOrigin(String origin){
this._origin = origin;
}
}
Click to expand...
Click to collapse
I suggest starting here:
http://forum.xda-developers.com/app-development