Android Application Components?

Application components are the essential building blocks of an Android application. These components are loosely coupled by the application manifest file AndroidManifest.xml that describes each component of the application and how they interact.

There are following four main components that can be used within an Android application:

Components	Description
Activities	They they dictate the UI and handle the user interaction to the smartphone screen
Services	They handle background processing associated with an application.
Broadcast Receivers	They handle communication between Android OS and applications.
Content Providers	They handle data and database management issues.

Activities

An activity represents a single screen with a user interface. For example, an email application might have one activity that shows a list of new emails, another activity to compose an email, and another activity for reading emails. If an application has more than one activity, then one of them should be marked as the activity that is presented when the application is launched.

An activity is implemented as a subclass of Activity class as follows:

public class MainActivity extends Activity {

}

Services

A service is a component that runs in the background to perform long-running operations. For example, a service might play music in the background while the user is in a different application, or it might fetch data over the network without blocking user interaction with an activity.

A service is implemented as a subclass of Service class as follows:

public class MyService extends Service {

}

Broadcast Receivers

Broadcast Receivers simply respond to broadcast messages from other applications or from the system. For example, applications can also initiate broadcasts to let other applications know that some data has been downloaded to the device and is available for them to use, so this is broadcast receiver who will intercept this communication and will initiate appropriate action.

A broadcast receiver is implemented as a subclass of BroadcastReceiver class and each message is broadcasted as an Intent object.

public class MyReceiver  extends  BroadcastReceiver {

}

Content Providers

A content provider component supplies data from one application to others on request. Such requests are handled by the methods of the ContentResolver class. The data may be stored in the file system, the database or somewhere else entirely.

A content provider is implemented as a subclass of ContentProvider class and must implement a standard set of APIs that enable other applications to perform transactions.

public class MyContentProvider extends  ContentProvider {

}

We will go through these tags in detail while covering application components in individual chapters.

Additional Components

There are additional components which will be used in the construction of above mentioned entities, their logic, and wiring between them. These components are:

Components	Description
Fragments	Represents a behavior or a portion of user interface in an Activity.
Views	UI elements that are drawn onscreen including buttons, lists forms etc.
Layouts	View hierarchies that control screen format and appearance of the views.
Intents	Messages wiring components together.
Resources	External elements, such as strings, constants and drawables pictures.
Manifest	Configuration file for the application.

Adjust Text size in All Android Devices?

Today iam try to solve Text size in all Android Devices, last one week am struggle to solve this issue finally found the solution of this issue.

STEP : 1
   first in   ` res` folder =>  values => dimensions.xml=> create  `dimensions.xml`  file to  `values folder`  in that create like below code depending on textsize

         <?xml version="1.0" encoding="utf-8"?>
           <resources>
               <dimen name="textsize">8sp</dimen>
               <dimen name="text">10sp</dimen>
               <dimen name="comments">7sp</dimen>
           </resources>

STEP : 2
   in java file write this line

    TextView textviewtwo = (TextView)findViewById(R.id.sponsertwo_txt);
   textviewtwo.setText("brought to you by");
   textviewtwo.setTextSize(TypedValue.COMPLEX_UNIT_PX,
getResources().getDimension(R.dimen.textsize));
          // in place of textsize use text and comments what ever we want depending on size. use like text size                  adjust automatically in all devices

ANDROID:BITMAP IMAGE STORE IN EXTERNAL OR INTERNAL STORAGE?

Write this line in onCreate() method, This line of code is used for checking Sd card  is available or not.

1. Boolean isSDPresent = android.os.Environment.getExternalStorageState().equals
                            (android.os.Environment.MEDIA_MOUNTED);

And this method is used for save your bitmap file in external and internal storage.

1. private String SaveImage_Sta(Bitmap finalBitmap, String name) {
   if(isSDPresent) {
   Log.i("isSDPresent yes", " path is==> " +isSDPresent );
   String root = Environment.getExternalStorageDirectory().toString() + "/profile";
   File myDir = new File(root);
   myDir.mkdirs();
   Random generator = new Random();
   int n = 10000;
   n = generator.nextInt(n);
   String fname = name + ".jpg";
   file = new File(myDir, fname);
   if (file.exists())
   file.delete();
   try {
   FileOutputStream out = new FileOutputStream(file);
   finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
   out.flush();
   out.close();
   
   
   } catch (Exception e) {
   e.printStackTrace();
   }
       } else {
       
        Log.i("isSDPresent no ", " path is==> false ");
        ContextWrapper cw = new ContextWrapper(getApplicationContext());
            // path to /data/data/yourapp/app_data/imageDir
           File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
           // Create imageDir
           file =new File(directory,"profile.jpg");       
         
           if (file.exists())
   file.delete();
           try {        
            FileOutputStream fos = new FileOutputStream(file);
            finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos);
            fos.flush();
               fos.close();
           
           } catch (Exception e) {
               e.printStackTrace();
           }       
       }
   return file.toString();
   } 

Check whether the sd card is available or not programatically?

Boolean isSDPresent = android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);

if(isSDPresent) {
  // yes SD-card is present available
}
else   {
 // Sorry no sd card available
}




Calculate the time difference between two time fields?

long difference = date2.getTime() - date1.getTime(); 

days = (int) (difference / (1000*60*60*24));  
hours = (int) ((difference - (1000*60*60*24*days)) / (1000*60*60)); 
min = (int) (difference - (1000*60*60*24*days) - (1000*60*60*hours)) / (1000*60);




Multiple Selection Listview in Android?

• In this example, we will create a ListView with multiple selection mode with button click event. On button click event, we retrieve the selected list view items and create a Bundle with array of selected items and store it in Intent and start another activity (ResultActivity).
• ResultActivity retrieves the array and displays the result in ListView.

XML layout files

activity_main.xml

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

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

    android:layout_width="fill_parent"

    android:layout_height="fill_parent" >

    <Button

        android:id="@+id/testbutton"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:text="submit" />

    <ListView

        android:id="@+id/list"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:layout_above="@id/testbutton"

        android:layout_alignParentTop="true" />

</RelativeLayout>

resultactivity.xml

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

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

    android:id="@+id/linearlayout"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <ListView

        android:id="@+id/outputList"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent" />

</LinearLayout>

Activity classes

MainActivity.java

 public class MainActivity extends Activity implements OnClickListener {

    Button button;

    ListView listView;

    ArrayAdapter<String> adapter;

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

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        findViewsById();

        String[] data = { "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten",

    "Cricket", "Tennis", "Foodball", "Tabletennis", "Hockey", "Golf", "Handball", "Vollyball",

    "Chess", "More" };

        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, data);

        listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        listView.setAdapter(adapter);

        button.setOnClickListener(this);

    }

    private void findViewsById() {

        listView = (ListView) findViewById(R.id.list);

        button = (Button) findViewById(R.id.testbutton);

    }

    public void onClick(View v) {

        SparseBooleanArray checked = listView.getCheckedItemPositions();

        ArrayList<String> selectedItems = new ArrayList<String>();

        for (int i = 0; i < checked.size(); i++) {

            // Item position in adapter

            int position = checked.keyAt(i);

            // Add sport if it is checked i.e.) == TRUE!

            if (checked.valueAt(i))

                selectedItems.add(adapter.getItem(position));

        }

        String[] outputStrArr = new String[selectedItems.size()]; 

        for (int i = 0; i < selectedItems.size(); i++) {

            outputStrArr[i] = selectedItems.get(i);

        }

        Intent intent = new Intent(getApplicationContext(),  ResultActivity.class); 

        // Create a bundle object

        Bundle b = new Bundle();

        b.putStringArray("selectedItems", outputStrArr); 

        // Add the bundle to the intent.

        intent.putExtras(b); 

        // start the ResultActivity

        startActivity(intent);

    }

}

ResultActivity.java

package com.example.multiblecheckboxs;

import android.app.Activity;

import android.os.Bundle;

import android.widget.ArrayAdapter;

import android.widget.ListView;

public class ResultActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.resultactivity);

Bundle b = getIntent().getExtras();

String[] resultArr = b.getStringArray("selectedItems");

ListView lv = (ListView) findViewById(R.id.outputList);

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,

         android.R.layout.simple_list_item_1, resultArr);

lv.setAdapter(adapter);

}

}

Output

Changing Edit-text status to password programmatically.

EditText edit = new EditText(MainActivity.this);
String temporary_stored_text = edit.getText().toString().trim();
edit.setTransformationMethod(PasswordTransformationMethod.getInstance());
edit.setText(temporary_stored_text);