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<?xml version="1.0" encoding="utf-8"?>
<manifest android:versionCode="1"
android:versionName="1.0"
package="com.test.android.boot"
xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk android:minSdkVersion="3"
android:targetSdkVersion="16" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application android:icon="@drawable/cw"
android:label="@string/app_name">
<activity
android:name="com.test.android.boot.TestActivity"
android:label="@string/app_name"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".MyBootReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
</application>
</manifest>
TestActivity.java
public class TestActivity extends Activity {
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
Toast.makeText(context, "Applications started..!", Toast.LENGTH_LONG).show();
Log.d("TestActivity", "onCreate!");
}
}
MyBootReceiver.java
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class MyBootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "Boot Completed..!", Toast.LENGTH_LONG).show();
Log.d("MyBootReceiver", "Boot Completed!");
}
}
public class HttpClient {
static URL url;
static HttpURLConnection conn;
static OutputStream os;
static String resultString=null;
public static String SendHttpPost(String URL, String req, Activity act) {
try{
url=new URL(URL);
conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setConnectTimeout(90000); //Connection Timeout time in mSec
conn.setReadTimeout(90000); //Read Timeout time in mSec
conn.setRequestProperty(HTTP.CONTENT_TYPE, "application/json");
conn.setRequestProperty("Accept", "application/json");
conn.setFixedLengthStreamingMode(req.getBytes().length);
conn.connect(); //open
long t = System.currentTimeMillis();
os = new BufferedOutputStream(conn.getOutputStream()); //setup send
os.write(req.getBytes());
os.flush(); //clean up
if (conn.getResponseCode() == HttpURLConnection.HTTP_OK){
Log.i("HttpClient", "HTTPResponse received in [" + (System.currentTimeMillis()-t) + "ms]");
//do somehthing with response
Scanner inStream = new Scanner(conn.getInputStream());
//process the stream and store it in StringBuilder
resultString = new String();
while(inStream.hasNextLine())
resultString+=(inStream.nextLine());
return resultString;
}
// handle issues
if (conn.getResponseCode() == HttpURLConnection.HTTP_CLIENT_TIMEOUT){
showMsgDialogToFinish("Alert", "Request Timed out..! Plsase Try again", "Go back", act);
}
if (conn.getResponseCode() == HttpURLConnection.HTTP_SERVER_ERROR){
showMsgDialogToGoHome("Alert", "We are sorry the service is currently unavailable..! Please try again later.", "Go back", act);
}
}catch (MalformedURLException e) {
} catch (SocketTimeoutException e) {
} catch (IOException e) {
Methods.wscContext =null;
e.printStackTrace();
}finally {
//clean up
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
conn.disconnect();
}
return null;
}
}
Sample JSON request: {"username":"user","password":"smething"}
JSONObject jsonReq = new JSONObject();
try {
jsonReq.put("username", username);
jsonReq.put("password", pwd);
} catch (JSONException e) {
Log.e(TAG, "JSONException: " + e);
}
public class GetResponse {
static String jsonResponse = null;
public static String getResponse(String url, Activity act){
try {
String username = "user";
String pwd = "something";
String contentType = "application/json";
JSONObject jsonReq = new JSONObject();
try {
jsonReq.put("username", username);
jsonReq.put("password", pwd);
} catch (JSONException e) {
Log.e(TAG, "JSONException: " + e);
}
Log.i("GetResponse",">>\n"+jsonReq+"\n ");
// Send the HttpPostRequest and receive a JSONObject in return
jsonResponse = new String();
jsonResponse = HttpClient.SendHttpPost( url, jsonReq, act);
} catch (JSONException e) {
e.printStackTrace();
}
return jsonResponse;
}
}
Sample JSON Request which is return from getResponseObj method
{
"MovieList": [{
"Movie": "Wreck it ralph",
},
{
"Movie": "Tangled",
}]
}
JSONObject jsonResponse; ArrayListmyMovieList = new ArrayList (); try { /* Creates a new JSONObject from the JSON string*/ jsonResponse = new JSONObject(strJson); /* Returns the value mapped by name */ JSONArray jsonMainNode = jsonResponse.getJSONArray("MovieList"); int lengthJsonArr = jsonMainNode.length(); for(int i=0; i < lengthJsonArr; i++) { /****** Get Object for each JSON node.***********/ JSONObject jsonChildNode = jsonMainNode.getJSONObject(i); /******* Fetch node values **********/ String movie_name = jsonChildNode.optString("Movie").toString(); myMovieList.add(movie_name); }
public class MainActivity extends Activity{
ListView listView;
@Override
protected void onCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.myLayout);
//GetListView object from xml
listView=(ListView)findViewById(R.id.list);
//use our myMovieList data
ArrayAdapteradapter=new ArrayAdapter
(this,android.R.layout.simple_list_item_1,android.R.id.text1,myMovieList);
//Assign adapter to ListView
listView.setAdapter(adapter);
//ListViewItemClickListener
listView.setOnItemClickListener(newOnItemClickListener(){
@Override
public void onItemClick(AdapterViewparent,Viewview,intposition,longid){
//ListView Clicked item index
int itemPosition=position;
//ListView Clicked itemvalue
StringitemValue=(String)listView.getItemAtPosition(position);
//ShowAlert
Toast.makeText(getApplicationContext(),"Position :"+itemPosition+" ListItem : "+itemValue,Toast.LENGTH_LONG).show();
}
});
}
}
Sample Output:
Debugging BOOT_COMPLETE Broadcast Receivers
Real screw head with animation - using CSS
Ionic Apps - Improve Performance
.png)
Picasso library: Loading Image from URL (HTTP)
Android interview questions and answers for Experienced (1 to 2 years) Part-1
Power of Android
Bills Reminder - Android Application
Top 10 Android websites
Executing a HTTP POST JSON Request with HttpClient