How to create AnalogClock and DigitalClock in Android.

Analogclock and Digitalclock views 

* The AnalogClock view displays an analog clock with two hands — one for minutes and one for hours.

* Its counterpart, the DigitalClock view, displays the time digitally. Both display the system time, and do not allow you to display a particular time.

* Hence, if you want to display the time for a particular region, you have to build your own custom views.

Using the AnalogClock and DigitalClock views are straightforward; simply declare them in your XML file (such as main.xml), like this:

<?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” ​​​​>

<AnalogClock ​​
​​android:layout_width=”wrap_content” ​​
​​android:layout_height=”wrap_content” />

<DigitalClock
​​​​android:layout_width=”wrap_content” ​​
​​android:layout_height=”wrap_content” />

</LinearLayout>

Android ProgressBar Example.

ProgressBar View 

* The ProgressBar view provides visual feedback of some ongoing tasks, such as when you are per- forming a task in the background.

* For example, you might be downloading some data from the Web and need to update the user about the status of the download.

* In this case, the ProgressBar view is a good choice for this task.


1 . Using Eclipse, create an Android project and name it as ProgressBarView. 

2 . Modify the main.xml file located in the res/layout folder by adding the following code in bold: 

<?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" >
   
 <ProgressBar android:id="@+id/progressbar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleHorizontal" />
       
</LinearLayout>

3 . In the MainActivity.java file, add the following statements in bold:

package com.emergingandroidtech.ProgressBarView;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ProgressBar;

public class MainActivity extends Activity {
   
    private static int progress;
    private ProgressBar progressBar;
    private int progressStatus = 0;
    private Handler handler = new Handler();
       
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        progress = 0;
        progressBar = (ProgressBar) findViewById(R.id.progressbar);
        progressBar.setMax(200);
       
        //---do some work in background thread---
        new Thread(new Runnable()
        {

            public void run()
            {
                //---do some work here---
                while (progressStatus < 200)
                {
                    progressStatus = doSomeWork();
                    //---Update the progress bar---
                    handler.post(new Runnable()
                    {
                        public void run() {
                            progressBar.setProgress(progressStatus);
                        }
                    });
                }

                //---hides the progress bar---
                handler.post(new Runnable()
                {
                    public void run()
                    {
                        //---0 - VISIBLE; 4 - INVISIBLE; 8 - GONE---
                        progressBar.setVisibility(8);
                    }
                });
            }   

            //---do some long lasting work here---
            private int doSomeWork()
            {
                try {
                    //---simulate doing some work---
                    Thread.sleep(50);
                } catch (InterruptedException e)
                {
                    e.printStackTrace();
                }
                return ++progress;
            }
        }).start(); 
    }
}

4 . It shows the ProgressBar animating. After about five seconds, it will disappear.

How to update an activity from BroadcastReceiver ?

Updating an Activity from a BroadcastReceiver

If you’ll want to send the SMS message back to the main activity of your application.

For example, you might wish to display the message in a TextView.

The following example demonstrates how you can do this.

Creating a View-Based Application Project

1- Add the following lines in bold to the main.xml file:

<?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"
    >
<Button
    android:id="@+id/btnSendSMS" 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Send SMS" />   
   
<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
   
</LinearLayout>

2 . Add the following statements in bold to the SMSReceiver.java file: 

package com.emergingandroidtech.SMS;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.widget.Toast;

public class SMSReceiver extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {       
        //---get the SMS message passed in---
        Bundle bundle = intent.getExtras();       
        SmsMessage[] msgs = null;
        String str = "";           
        if (bundle != null)
        {
            //---retrieve the SMS message received---
            Object[] pdus = (Object[]) bundle.get("pdus");
            msgs = new SmsMessage[pdus.length];           
            for (int i=0; i<msgs.length; i++){
                msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);               
                str += "SMS from " + msgs[i].getOriginatingAddress();                    
                str += " :";
                str += msgs[i].getMessageBody().toString();
                str += "\n";       
            }
            //---display the new SMS message---
            Toast.makeText(context, str, Toast.LENGTH_SHORT).show();
    
        
            //---send a broadcast intent to update the SMS received in the activity---
            Intent broadcastIntent = new Intent();
            broadcastIntent.setAction("SMS_RECEIVED_ACTION");
            broadcastIntent.putExtra("sms", str);
            context.sendBroadcast(broadcastIntent);
        }                        
    }
}

3 . Add the following statements in bold to the MainActivity.java file: 

package com.emergingandroidtech.SMS;

import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
   
    Button btnSendSMS;       
    IntentFilter intentFilter;   
   
    private BroadcastReceiver intentReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            //---display the SMS received in the TextView---
            TextView SMSes = (TextView) findViewById(R.id.textView1);
            SMSes.setText(intent.getExtras().getString("sms"));
        }
    };
       
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);       
       
        //---intent to filter for SMS messages received---
        intentFilter = new IntentFilter();
        intentFilter.addAction("SMS_RECEIVED_ACTION");

       
       
        btnSendSMS = (Button) findViewById(R.id.btnSendSMS);       
        btnSendSMS.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View v)
            {               
                //sendSMS("5554", "Hello my friends!");
               
                Intent i = new
                    Intent(android.content.Intent.ACTION_VIEW);
                i.putExtra("address", "5556; 5558; 5560");
                i.putExtra("sms_body", "Hello my friends!");
                i.setType("vnd.android-dir/mms-sms");
                startActivity(i);
                                          
            }
        });
    }
       
    @Override
    protected void onResume() {
        //---register the receiver---
        registerReceiver(intentReceiver, intentFilter);
        super.onResume();
    }
   
    @Override
    protected void onPause() {
        //---unregister the receiver---
        unregisterReceiver(intentReceiver);
        super.onPause();
    }
       
  
   
        //---sends an SMS message to another device---
    private void sendSMS(String phoneNumber, String message)
    {    
       //...
    }

}

4. Add the following lines in Android Manifest file .

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.emergingandroidtech.SMS"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".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=".SMSReceiver">
            <intent-filter>
                <action android:name=
                    "android.provider.Telephony.SMS_RECEIVED" />
            </intent-filter>
        </receiver>

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

<uses-permission android:name="android.permission.SEND_SMS"></uses-permission>
<uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>
</manifest>

5 .Using the DDMS, send an SMS message to the emulator. It shows the Toast class displaying the message received, and the TextView showing the message received.