How to Make a Phone Call Programmatically in Android

 -------------------------------------------
App Name: MakeACall
Package Name: com.rdc
Android SDK: Android SDK 2.3.3 / API 10
Default Activity Name: MyActivity
-------------------------------------------


MyActivity.java

package com.rdc;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MyActivity extends Activity implements OnClickListener {

 private Button btncall = null;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  btncall = (Button) findViewById(R.id.btnCall);
  btncall.setOnClickListener(this);
 }

 @Override
 public void onClick(View v) {
  String mobileNo = "+919741817902";
  String uri = "tel:" + mobileNo.trim();
  Intent intent = new Intent(Intent.ACTION_CALL);
  intent.setData(Uri.parse(uri));
  startActivity(intent);
 }
}

main.xml

AndroidManifest.xml

The output Screen will be like this..

You can download the complete source code zip file here : MakeACall

 cheers!!

 I'd love to hear your thoughts!

Start Service from Activity

Some time we need to start a service from Android Activity..
how can we achieve this i am going to write step by step.

First of all we need to Create a simple application with an Activity

-------------------------------------------
App Name: Activity2Service
Package Name: com.rdc
Android SDK: Android SDK 2.3.3 / API 10
Default Activity Name: MyActivity
-------------------------------------------


"MyActivity.java"

 
package com.rdc;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

public class MyActivity extends Activity {

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  Log.v("Debug", "Activity has been Started..");
  Toast.makeText(getBaseContext(), 
                      "Activity Started", Toast.LENGTH_SHORT)
    .show();
  Intent myIntent = new Intent(getBaseContext(), MyService.class);
  startService(myIntent);
 }
}

Then Create a Service

  
package com.rdc;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class MyService extends Service {

 @Override
 public IBinder onBind(Intent intent) {
  return null;
 }

 @Override
 public void onCreate() {
  Log.v("Debug", "Service has been Created..");
  // code to execute when the service is first created
 }

 @Override
 public void onDestroy() {
  // code to execute when the service is shutting down
 }

 // This method has been deprecated since API 5
 /*
   @Override public void onStart(Intent intent, int startid) { 
          code to execute when the service is starting up
    }*/
  

 @Override
 public int onStartCommand(Intent intent, int flags, int startId) {
  Log.v("Debug", "Service has been Started..");
  Toast.makeText(getBaseContext(), "Service has been Started..",
    Toast.LENGTH_SHORT).show();
  // We want this service to continue running until it's explicitly
  // stopped, so return sticky.
  return START_STICKY;
 }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

Don't forget to make entry in "Manifest" file for Service

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

 <application
  android:icon="@drawable/icon"
  android:label="@string/app_name">
  <activity
   android:name=".MyActivity"
   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:enabled="true"
   android:name=".MyService">
   <intent-filter>
    <action android:name="com.rdc.MyService">
    </action>
   </intent-filter>
  </service>

 </application>

</manifest>

Now Run Application, Toast will appear..  :)

You can download the complete source code zip file here : Activity2Service

cheers!!

I'd love to hear your thoughts!

Start Activity from Activity

Some time we need to start an Activity from Activity..
how can we achieve this i am going to write step by step.

We will create very simple app to do this work
 -------------------------------------------
App Name: Activity2Activity
Package Name: com.rdc
Android SDK: Android SDK 2.3.3 / API 10
Default Activity Name: FirstActivity
-------------------------------------------


FirstActivity.java

package com.rdc;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class FirstActivity extends Activity implements OnClickListener {
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.first);

  Button btnload = (Button) findViewById(R.id.btnfirst);
  btnload.setOnClickListener(this);

 }

 @Override
 public void onClick(View v) {
  Intent i = new Intent(FirstActivity.this, SecondActivity.class);
  startActivity(i);
 }
}

SecondActivity.java

package com.rdc;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SecondActivity extends Activity implements OnClickListener {
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.second);

  Button btnload = (Button) findViewById(R.id.btnsecond);
  btnload.setOnClickListener(this);

 }

 @Override
 public void onClick(View v) {
  Intent i = new Intent(SecondActivity.this, FirstActivity.class);
  startActivity(i);
 }
}

first.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <TextView
  android:layout_width="fill_parent"
  android:text="I am first activity.."
  android:gravity="center"
  android:layout_height="62dp" />
 <LinearLayout
  android:id="@+id/layV"
  android:orientation="vertical"
  android:gravity="center"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <Button
   android:text="Load Second Activity"
   android:layout_height="wrap_content"
   android:layout_width="wrap_content"
   android:id="@+id/btnfirst"></Button>
 </LinearLayout>

</LinearLayout>

second.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <TextView
  android:layout_width="fill_parent"
  android:text="I am Second activity.."
  android:gravity="center"
  android:layout_height="62dp" />
 <LinearLayout
  android:id="@+id/layV"
  android:orientation="vertical"
  android:gravity="center"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <Button
   android:text="Load First Activity"
   android:layout_height="wrap_content"
   android:layout_width="wrap_content"
   android:id="@+id/btnsecond"></Button>
 </LinearLayout>

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest
 xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.rdc"
 android:versionCode="1"
 android:versionName="1.0">
 <uses-sdk android:minSdkVersion="10" />

 <application
  android:icon="@drawable/icon"
  android:label="@string/app_name">
 <activity
   android:name=".FirstActivity"
   android:label="@string/app_name">
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />
 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>

 <activity
   android:name=".SecondActivity"
   android:label="@string/app_name">
 <intent-filter>
 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>

 </application>
</manifest>

The output Screen will be like this..

You can download the complete source code zip file here : Activity2Activity

 cheers!!

 I'd love to hear your thoughts!

Start BroadcastReceiver from Activity

Some time we need to start a service from Android Activity..
how can we achieve this i am going to write step by step.

We will create very simple app to do this work
 -------------------------------------------
App Name: Activity2BReceiver
Package Name: com.rdc
Android SDK: Android SDK 2.3.3 / API 10
Default Activity Name: MyActivity
-------------------------------------------


MyActivity.java

  
package com.rdc;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class MyActivity extends Activity {   
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Log.v("Debug", "Activity has been started..");
    }
}

Then Create a Broadcast Receiver

MyReceiver.java

  
package com.rdc;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;

public class MyReceiver extends BroadcastReceiver {

 @Override
 public void onReceive(Context context, Intent intent) {
  Log.v("Debug", "SMS Broadcast Receiver has been started..");
  Toast.makeText(context, "BReceiver is watching ur message..", 
    Toast.LENGTH_SHORT).show();

 }

}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

Don't forget to make entry in "Manifest" file for Receiver

  
<?xml version="1.0" encoding="utf-8"?>
<manifest
 xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.rdc"
 android:versionCode="1"
 android:versionName="1.0">
 <uses-sdk android:minSdkVersion="10" />
 <uses-permission android:name="android.permission.RECEIVE_SMS">
 </uses-permission>
 <application
  android:icon="@drawable/icon"
  android:label="@string/app_name">
  <activity
   android:name=".MyActivity"
   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="com.rdc.MyReceiver">

   <intent-filter>
  <action android:name="android.provider.Telephony.SMS_RECEIVED" />
   </intent-filter>
  </receiver>

 </application>
</manifest>

Run this app and send message from another mobile/emulator, Receiver will notify you about new sms
See below output screens tensted on Emulator and Real Device

You can download the complete source code zip file here : Activity2BReceiver


I'd love to hear your thoughts!