August 12,2016

In android, you can define your own custom fonts for the strings in your application. You just need to download the required font from the internet, and then place it in assets/fonts folder.

After putting fonts in the assets folder under fonts folder, you can access it in your java code through Typeface class. First , get the reference of the text view in the code. Its syntax is given below −

TextView tx = (TextView)findViewById(R.id.textview1);

The next thing you need to do is to call static method of Typeface class createFromAsset() to get your custom font from assets. Its syntax is given below −

Typeface custom_font = Typeface.createFromAsset(getAssets(), "fonts/font name.ttf");

The last thing you need to do is to set this custom font object to your TextView Typeface property. You need to call setTypeface() method to do that. Its syntax is given below −

tx.setTypeface(custom_font);

Apart from these Methods, there are other methods defined in the Typeface class , that you can use to handle Fonts more effectively.

August 11,2016

These are the following two ways, in which you can use camera in your application

• Using existing android camera application in our application
• Directly using Camera API provided by android in our application

Using existing android camera application in our application

You will use MediaStore.ACTION_IMAGE_CAPTURE to launch an existing camera application installed on your phone. Its syntax is given below

Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

Apart from the above, there are other available Intents provided by MediaStore. They are listed as follows

August 10,2016

Android provides Bluetooth API to perform these different operations.

• Scan for other Bluetooth devices
• Get a list of paired devices
• Connect to other devices through service discovery

Android provides BluetoothAdapter class to communicate with Bluetooth. Create an object of this calling by calling the static method getDefaultAdapter(). Its syntax is given below.

private BluetoothAdapter BA;
BA = BluetoothAdapter.getDefaultAdapter();

In order to enable the Bluetooth of your device, call the intent with the following Bluetooth constant ACTION_REQUEST_ENABLE. Its syntax is.

Intent turnOn = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOn, 0);

Apart from this constant, there are other constants provided the API , that supports different tasks. They are listed below.

Once you enable the Bluetooth , you can get a list of paired devices by calling getBondedDevices() method. It returns a set of bluetooth devices. Its syntax is.

private Set<BluetoothDevice>pairedDevices;
pairedDevices = BA.getBondedDevices();

Apart form the parried Devices , there are other methods in the API that gives more control over Blueetooth. They are listed below.

August 9,2016

In order to use AutoCompleteTextView you have to first create an AutoCompletTextView Field in the xml. Its syntax is given below.

<AutoCompleteTextView
   android:id="@+id/autoCompleteTextView1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_alignParentTop="true"
   android:layout_centerHorizontal="true"
   android:layout_marginTop="65dp"
   android:ems="10" >

After that, you have to get a reference of this textview in java. Its syntax is given below.

private AutoCompleteTextView actv;
actv = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);

The the next thing you need to do is to specify the list of suggestions items to be displayed. You can specify the list items as a string array in java or in strings.xml. Its syntax is given below.

String[] countries = getResources().getStringArray(R.array.list_of_countries);
ArrayAdapter<String> adapter = new ArrayAdapter<String>
   (this,android.R.layout.simple_list_item_1,countries);
actv.setAdapter(adapter);

The array adapter class is responsible for displaying the data as list in the suggestion box of the text field. The setAdapter method is used to set the adapter of the autoCompleteTextView. Apart from these methods, the other methods of Auto Complete are listed below.

August 8,2016

In order to use AndroidManager class, you have to first create an object of AudioManager class by calling the getSystemService() method. Its syntax is given below.

private AudioManager myAudioManager;
myAudioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

Once you instantiate the object of AudioManager class, you can use setRingerMode method to set the audio or ringer profile of your device. Its syntax is given below.

myAudioManager.setRingerMode(AudioManager.RINGER_MODE_VIBRATE);

The method setRingerMode takes an integer number as a parameter. For each mode , an integer number is assigned that will differentiate between different modes. The possible modes are.

Once you have set the mode , you can call the getRingerMode() method to get the set state of the system. Its syntax is given below.

int mod = myAudioManager.getRingerMode();

Apart from the getRingerMode method, there are other methods available in the AudioManager class to control the volume and other modes. They are listed below.

August 5,2016

Android has a built in microphone through which you can capture audio and store it , or play it in your phone. There are many ways to do that but the most common way is through MediaRecorder class.

Android provides MediaRecorder class to record audio or video. In order to use MediaRecorder class ,you will first create an instance of MediaRecorder class. Its syntax is given below.

MediaRecorder myAudioRecorder = new MediaRecorder();

Now you will set the source , output and encoding format and output file. Their syntax is given below.

myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
myAudioRecorder.setOutputFile(outputFile);

After specifying the audio source and format and its output file, we can then call the two basic methods prepare and start to start recording the audio.

myAudioRecorder.prepare();
myAudioRecorder.start();

Apart from these methods , there are other methods listed in the MediaRecorder class that allows you more control over audio and video recording.

August 4,2016

Animation is the process of creating motion and shape change

Animation in android is possible from many ways. In this chapter we will discuss one easy and widely used way of making animation called tweened animation.

Tween Animation

Tween Animation takes some parameters such as start value , end value, size , time duration , rotation angle e.t.c and perform the required animation on that object. It can be applied to any type of object. So in order to use this , android has provided us a class called Animation.

In order to perform animation in android , we are going to call a static function loadAnimation() of the class AnimationUtils. We are going to receive the result in an instance of Animation Object. Its syntax is as follows −

Animation animation = AnimationUtils.loadAnimation(getApplicationContext(), 
   R.anim.myanimation);

Note the second parameter. It is the name of the our animation xml file. You have to create a new folder called anim under res directory and make an xml file under anim folder.

This animation class has many useful functions which are listed below −

In order to apply this animation to an object , we will just call the startAnimation() method of the object. Its syntax is −

ImageView image1 = (ImageView)findViewById(R.id.imageView1);
image.startAnimation(animation);

August 3,2016

In this example, we are adding a label on button click and displaying all the added labels on the spinner. As you have seen in the previous example, SQLiteOpenHelper class need to be extended for performing operations on the sqlite.

We have overridden the onCreate() and onUpgrade() method of SQLiteOpenHelper class in the DatabaseHandler class that provides additional methods to insert and display the labels or data.

Android Sqlite Spinner Example

Let’s see the simple code to add and display the string content on spinner using sqlite database.

activity_main.xml

August 2,2016

SQLiteDatabase class

It contains methods to be performed on sqlite database such as create, update, delete, select etc.

Methods of SQLiteDatabase class

There are many methods in SQLiteDatabase class. Some of them are as follows:

August 1,2016

Today i come to know the sqlite  and database in android.

Android SQLite

SQLite is an open-source relational database i.e. used to perform database operations on android devices such as storing, manipulating or retrieving persistent data from the database.

It is embedded in android bydefault. So, there is no need to perform any database setup or administration task.

SQLiteOpenHelper class

The android.database.sqlite.SQLiteOpenHelper class is used for database creation and version management. For performing any database operation, you have to provide the implementation of onCreate() and onUpgrade() methods of SQLiteOpenHelper class.

Constructors of SQLiteOpenHelper class

There are two constructors of SQLiteOpenHelper class.

Methods of SQLiteOpenHelper class

There are many methods in SQLiteOpenHelper class. Some of them are as follows: