Updated Google Android Maps API v2 Tutorial

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Forward GeoCoding Example

Download project : ForwardGeoCodingExample.zip

 

activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="enter address to find location"
        android:inputType="textPersonName" />

    <Button
        android:id="@+id/button_find"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Find Location"
        android:layout_gravity="center"
        android:layout_marginTop="20dp" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Location is :"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

MainActivity.java:

package com.ram.forwardgeocoding;

import java.io.IOException;
import java.util.List;

import android.app.Activity;
import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {
    EditText edit;
    TextView text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        edit = (EditText) findViewById(R.id.editText);
        text = (TextView) findViewById(R.id.textView);

        Button findBtn = (Button) findViewById(R.id.button_find);

        findBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                String address = edit.getText().toString();

                Geocoder geoCoder = new Geocoder(getApplicationContext());

                try {
                    List<Address> locations = geoCoder.getFromLocationName(
                            address, 1);

                    for (Address a : locations) {
                        double latti = a.getLatitude();
                        double longi = a.getLongitude();

                        text.append(latti + "," + longi);
                    }

                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        });

    }
}

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ram.forwardgeocoding"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.ram.forwardgeocoding.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

IntentService with WebService Example

activity_main.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="getData"
        android:text="get data" />

    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/textView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceLarge" />
        </LinearLayout>
    </ScrollView>

</LinearLayout>

MyWebService.java:
package com.ram.intentservice;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;

import android.app.IntentService;
import android.content.Intent;

public class MyWebService extends IntentService {

    public MyWebService() {
        super("DownloadService");
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(
                "http://www.cheesejedi.com/rest_services/get_big_cheese.php?puzzle=");

        try {

            HttpResponse response = httpclient.execute(httppost);
            String jsonResult = inputStreamToString(
                    response.getEntity().getContent()).toString();

            if (jsonResult != null) {
                sendResultBroadcast(jsonResult);
            }

        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private StringBuilder inputStreamToString(InputStream is) {
        String rLine = "";
        StringBuilder answer = new StringBuilder();

        InputStreamReader isr = new InputStreamReader(is);

        BufferedReader rd = new BufferedReader(isr);

        try {
            while ((rLine = rd.readLine()) != null) {
                answer.append(rLine);
            }
        }

        catch (IOException e) {
            e.printStackTrace();
        }
        return answer;
    }

    void sendResultBroadcast(String jsonResult) {
        Intent in = new Intent();

        in.putExtra("jsonresult", jsonResult);

        in.setAction("com.ram.CUSTOM_BROADCAST");

        sendBroadcast(in);
    }
}





MainActivity.java:
package com.ram.intentservice;

import org.json.JSONArray;
import org.json.JSONException;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {
    TextView textView;
    ProgressDialog pd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        registerReceiver(new WebServiceBroadcast(), new IntentFilter(
                "com.ram.CUSTOM_BROADCAST"));

        textView = (TextView) findViewById(R.id.textView);

    }

    public void getData(View v) {
        pd = ProgressDialog.show(MainActivity.this, "loading", "plz wait");

        Intent intentService = new Intent(getApplicationContext(),
                MyWebService.class);
        startService(intentService);
    }

    class WebServiceBroadcast extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {

            pd.cancel();

            String jsonResult = intent.getStringExtra("jsonresult");

            JSONArray jsonArray = null;

            try {
                jsonArray = new JSONArray(jsonResult);

                for (int i = 0; i < jsonArray.length(); i++) {

                    textView.append("id: "
                            + jsonArray.getJSONObject(i).getString("id")
                                    .toString() + "\n");

                    textView.append("level: "
                            + jsonArray.getJSONObject(i).getString("level")
                                    .toString() + "\n");
                    textView.append("time_in_secs: "
                            + jsonArray.getJSONObject(i)
                                    .getString("time_in_secs").toString()
                            + "\n");
                    textView.append("par: "
                            + jsonArray.getJSONObject(i).getString("par")
                                    .toString() + "\n");
                    textView.append("initials: "
                            + jsonArray.getJSONObject(i).getString("initials")
                                    .toString() + "\n");
                    textView.append("quote: "
                            + jsonArray.getJSONObject(i).getString("quote")
                                    .toString() + "\n");
                    textView.append("time_stamp: "
                            + jsonArray.getJSONObject(i)
                                    .getString("time_stamp").toString() + "\n");
                    textView.append("" + "\n");

                }
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }

    }
}


AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ram.intentservice"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.ram.intentservice.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name="MyWebService"></service>
    </application>

</manifest> 

Android Interview Questions and Answers

http://blog.icorethink.com/interviewque/android-interview-questions-and-answers/

Using HttpURLConnection class in Android

Download this project---->HttpUrlConnection.zip
ScreenShot:

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <TextView

        android:id="@+id/textView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginLeft="17dp"

        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

MainActivity.java:

package com.ram.httpurlconnection;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.os.Bundle;

import android.os.StrictMode;

import android.widget.TextView;

@SuppressLint("NewApi")

public class MainActivity extends Activity {

TextView text;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

text = (TextView) findViewById(R.id.textView);

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()

.permitAll().build();

StrictMode.setThreadPolicy(policy);

try {

// The URI class can be used to manipulate URLs of any protocol.

URL url = new URL("http://www.google.com");

// Obtain a new HttpURLConnection by calling URL.openConnection()

// and casting the result to HttpURLConnection.

HttpURLConnection con = (HttpURLConnection) url.openConnection();

// Returns an InputStream for reading data from the resource pointed

// by this URLConnection

readStream(con.getInputStream());

} catch (Exception e) {

e.printStackTrace();

/*

* Toast.makeText(getApplicationContext(), e.getMessage(),

* Toast.LENGTH_LONG).show();

*/

text.setText(e.getMessage());

}

}

private void readStream(InputStream in) {

StringBuffer sb = new StringBuffer();

BufferedReader reader = null;

try {

reader = new BufferedReader(new InputStreamReader(in));

String line = "";

while ((line = reader.readLine()) != null) {

sb.append(line);

}

text.setText(sb.toString());

} catch (IOException e) {

e.printStackTrace();

} finally {

if (reader != null) {

try {

reader.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

}

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.ram.httpurlconnection"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="18" />

    <uses-permission android:name="android.permission.INTERNET" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.ram.httpurlconnection.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

Internal Storage Example in Android

Download this example here : InernalStorage.zip
Screen Shots:

you can check file creation in DDMS Perspective as follows:

 

activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="enter file name:"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <EditText
        android:id="@+id/editText_filename"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPersonName" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="enter text to save"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <EditText
        android:id="@+id/editText_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPersonName" />

    <Button
        android:id="@+id/button_save"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:text="Create file and save text" />

    <Button
        android:id="@+id/button_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:text="view text from saved file" />

    <TextView
        android:id="@+id/textView_display"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

MainActivity.java:

package com.ram.internalstorage;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
    private EditText editFile, editText;
    private TextView text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editFile = (EditText) findViewById(R.id.editText_filename);
        editText = (EditText) findViewById(R.id.editText_text);
        text = (TextView) findViewById(R.id.textView_display);

        Button saveBtn = (Button) findViewById(R.id.button_save);
        Button viewBtn = (Button) findViewById(R.id.button_view);

        saveBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                String fileName = editFile.getText().toString();
                String textToSave = editText.getText().toString();

                try {
                    FileOutputStream fos = openFileOutput(fileName + ".txt",
                            MODE_PRIVATE);

                    fos.write(textToSave.getBytes());

                    fos.close();

                    Toast.makeText(getApplicationContext(),
                            "file created and text saved", Toast.LENGTH_LONG)
                            .show();
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });

        viewBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                try {
                    FileInputStream fis = openFileInput(editFile.getText()
                            .toString() + ".txt");

                    StringBuffer sb = new StringBuffer();

                    int i;

                    while ((i = fis.read()) != -1) {

                        sb.append((char) i);
                    }

                    fis.close();

                    text.setText(sb.toString());
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        });
    }
}
 

REST+JSON Web service Example in Android.

Download this project-->REST+JSONWebserviceExample.zip
output:

activity_main.xml:

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/ScrollView1"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content" >

        <TextView

            android:id="@+id/textView1"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:textAppearance="?android:attr/textAppearanceLarge" />

    </LinearLayout>

</ScrollView>

MainActivity.java:

package com.ram.restjsonwebserviceexample;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import org.apache.http.HttpResponse;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import org.json.JSONArray;

import org.json.JSONException;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.os.Bundle;

import android.os.StrictMode;

import android.widget.TextView;

@SuppressLint("NewApi")

public class MainActivity extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()

.permitAll().build();

StrictMode.setThreadPolicy(policy);

setContentView(R.layout.activity_main);

HttpClient httpclient = new DefaultHttpClient();

HttpPost httppost = new HttpPost(

"http://www.cheesejedi.com/rest_services/get_big_cheese.php?puzzle=");

TextView textView = (TextView) findViewById(R.id.textView1);

try {

HttpResponse response = httpclient.execute(httppost);

String jsonResult = inputStreamToString(

response.getEntity().getContent()).toString();

JSONArray jsonArray = new JSONArray(jsonResult);

for (int i = 0; i < jsonArray.length(); i++) {

textView.append("id: "

+ jsonArray.getJSONObject(i).getString("id").toString()

+ "\n");

textView.append("level: "

+ jsonArray.getJSONObject(i).getString("level")

.toString() + "\n");

textView.append("time_in_secs: "

+ jsonArray.getJSONObject(i).getString("time_in_secs")

.toString() + "\n");

textView.append("par: "

+ jsonArray.getJSONObject(i).getString("par")

.toString() + "\n");

textView.append("initials: "

+ jsonArray.getJSONObject(i).getString("initials")

.toString() + "\n");

textView.append("quote: "

+ jsonArray.getJSONObject(i).getString("quote")

.toString() + "\n");

textView.append("time_stamp: "

+ jsonArray.getJSONObject(i).getString("time_stamp")

.toString() + "\n");

textView.append("-------------------------------------------------"

+ "\n");

}

// textView.setText(jsonResult);

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} catch (JSONException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

private StringBuilder inputStreamToString(InputStream is) {

String rLine = "";

StringBuilder answer = new StringBuilder();

InputStreamReader isr = new InputStreamReader(is);

BufferedReader rd = new BufferedReader(isr);

try {

while ((rLine = rd.readLine()) != null) {

answer.append(rLine);

}

}

catch (IOException e) {

e.printStackTrace();

}

return answer;

}

}

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.ram.restjsonwebserviceexample"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="19" />

    <uses-permission android:name="android.permission.INTERNET" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.ram.restjsonwebserviceexample.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

Custom BroadcastReceiver in Android

This example will show you how to create our own custom BroadCastReceiver in Android.

ScreenShots:

strings.xml:

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string name="app_name">CustomBroadcastReceiver</string>

    <string name="action_settings">Settings</string>

    <string name="hello_world">Hello world!</string>

    <string name="textview_title">Custom BroadCast Receiver example</string>

    <string name="button_title">Custom BroadCast</string>

</resources>

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="108dp"

        android:text="@string/button_title" 

        android:onClick="customBroadCast"/>

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="18dp"

        android:text="@string/textview_title"

        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

CustomBroadCast.java:

package com.ram.custombroadcastreceiver;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.widget.Toast;

public class CustomBroadCast extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent arg1) {

 

Toast.makeText(context, "BroadCast Detected", Toast.LENGTH_LONG).show();

}

}

MainActivity.java:

package com.ram.custombroadcastreceiver;

import android.app.Activity;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.view.View;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

registerReceiver(new CustomBroadCast(), new IntentFilter(

"com.ram.CUSTOM_BROADCAST"));

}

public void customBroadCast(View v) {

Intent intent = new Intent();

intent.setAction("com.ram.CUSTOM_BROADCAST");

sendBroadcast(intent);

}

}

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.ram.custombroadcastreceiver"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="19" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.ram.custombroadcastreceiver.MainActivity"

            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="CustomBroadCast" >

            <intent-filter>

                <action android:name="com.ram.CUSTOM_BROADCAST" >

                </action>

            </intent-filter>

        </receiver>

        -->

    </application>

</manifest>

Prevent Activity Restarting when orientation changes

Add following tag  under Activity tag in AndroidManifest.xml

android:configChanges="orientation|screenSize"

Implicit Intent video tutorial

http://www.youtube.com/watch?v=7vdL1jzJ2hU&feature=youtu.be

ActiviyLifecycle example video tutorial

http://www.youtube.com/watch?v=nfbhnI2VDUM&feature=youtu.be

IntentService Example in Android

IntentService is a base class for Services that handle asynchronous requests (expressed as Intents) on demand. Clients send requests through startService(Intent) calls; the service is started as needed, handles each Intent in turn using a worker thread, and stops itself when it runs out of work.


Check output in LogCat.

step1: create a new project.
Step2: create new java class that extends with IntentService class.
step3: Call IntentService in Activity using startService() method.


ProjectName : IntentService
XML Layouts : activity_main.xml
Java Classes: MainActivity, MyService

strings.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">IntentService</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="button_title">Start Service</string>

</resources>

activity_main.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="94dp"
        android:onClick="startService"
        android:text="@string/button_title" />

</RelativeLayout>

MyService.java:
package com.ram.intentservice;

import android.app.IntentService;
import android.content.Intent;
import android.util.Log;

public class MyService extends IntentService {

public MyService() {
super("helloservice");
// TODO Auto-generated constructor stub
}

@Override
public void onCreate() {
super.onCreate();
Log.d("Intent Service", "service created");
}

@Override
protected void onHandleIntent(Intent intent) {
Log.d("Intent Service", "service started");
synchronized (intent) {

}
}

}

MainActivity.java:

package com.ram.intentservice;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

public void startService(View v) {

Intent in = new Intent(getApplicationContext(), MyService.class);

startService(in);

}

}