Android Code Palace

Working with Intent in Android :


# We have to create an "Intent"  for moving one activity to another activity  :

• Create an xml file named as "second.xml" and copy and paste below code to this xml file.
• Create a class file under "src" folder named as "SecondExampleActivity" and renamed first class file to "IntentExampleActivity".
• Pick two images file and copy this in res/drawable folder.(for first and second activity)

// Source Code of  main.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

     <TableLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
       
    <TableRow >    
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    </TableRow>
    <TableRow >
    <Button 
        android:id="@+id/btnNext"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Go to Second Activity"/>
    </TableRow>
   <TableRow >
   <ImageView 
       android:id="@+id/first"
       android:src="@drawable/first"
       android:layout_width="280px"
       android:layout_height="320px"/>
    </TableRow>
    </TableLayout>
    </LinearLayout>


// Source Code of  second.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
   
     <TableLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
       
    <TableRow >
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    </TableRow>
    <TableRow >
    <Button 
        android:id="@+id/btnEnd"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Go to first activity" />
    </TableRow>
    <TableRow >
    <ImageView 
        android:id="@+id/second"
        android:src="@drawable/second"
        android:layout_width="280px"
        android:layout_height="320px"/>
    </TableRow>
    </TableLayout>
</LinearLayout>



// Source Code of  IntentExampleActivity.java :

package com.myApp.IntentExample;

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

public class IntentExampleActivity extends Activity
{
    /** Called when the activity is first created. */
Button btnNext;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
       
         Button btnNext= (Button) findViewById(R.id.btnNext);
         btnNext.setOnClickListener(new View.OnClickListener()
         {
public void onClick(View arg0)
{
// TODO Auto-generated method stub
Intent firstintent=new Intent(IntentExampleActivity.this,SecondExampleActivity.class);
startActivity(firstintent);
}
         });
     }
}

// Source Code of  SecondExampleActivity.java :

package com.myApp.IntentExample;

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

public class SecondExampleActivity extends Activity {
    /** Called when the activity is first created. */
Button btnEnd;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
       
        Button btnEnd=(Button) findViewById(R.id.btnEnd);
        btnEnd.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
Intent secondintent=new Intent(SecondExampleActivity.this,IntentExampleActivity.class);
startActivity(secondintent);

}
});
       
}
   
}


Output :

First Activity

Second Activity

 How to install .apk file in Android Emulator :

  You have to follow these steps :


Step.1 :  Download any .apk file.
Step.2 :  Paste this into your "android-sdk-windows/platform-tools/" folder.
Step.3 :  Run command prompt.
Step.4 :  Set path of your command prompt to "..../platform-tools" folder with the help of "cd"(change directory) command.
Step.5 :  Finally , run following command :
                 C:\.........\platform-tools> adb install filename.apk and press enter.
                Please wait for a while , for successfull installation of apk. Filename would be name of your downloaded .apk file.
Step.6 :   Restart Emulator , open menu and you got that application in your grid menu icons.




Same process will be follow with "tools" folder if "adb"(android debugger bridge) is not available in "platform-tools" folder.



Step.1 :  Download any .apk file.
Step.2 :  Paste this into your "android-sdk-windows/tools/" folder.
Step.3 :  Run command prompt.
Step.4 :  Set path of your command prompt to "..../tools" folder with the help of "cd"(change directory) command.
Step.5 :  Finally , run following command :
                 C:\.........\tools> adb install filename.apk and press enter.
                Please wait for a while , for successfull installation of apk. Filename would be name of  your downloaded .apk file.
Step.6 :   Restart Emulator , open menu and you got that application in your grid menu icons.



If "adb" is not available in "tools" folder then there will be a text file named as "adb_has_moved" then it is clear that "adb" present in "platform-tools" folder.

 Play Audio File in Android :

# We have to create an application in which when we click on "play" button , audio file should be play :

• Create a new project named as "ListeningSong" and class name will be such as "ListeningSongActivity.java".
• Pick an audio file.
• Create a  new folder named as "raw" under res directory.Paste audio file under this raw folder.
• Pick an image icon file named as "btnscreen.png". Paste this file under drawable folders.

      // Source Code of  ListeningSongActivity.java : 
    package com.myApp.ListeningSong;

    import android.app.Activity;
    import android.media.MediaPlayer;
    import android.media.MediaPlayer.OnCompletionListener;
    import android.os.Bundle;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.View.OnTouchListener;
    import android.widget.Button;

    public class ListeningSongActivity extends Activity
    {
           /** Called when the activity is first created.  **/
   @Override
    public void onCreate(Bundle savedInstanceState)
   {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button b = (Button) findViewById(R.id.playSound);
        b.setOnTouchListener(new OnTouchListener() {

               public boolean onTouch(View v, MotionEvent event)
                   {
                       if (event.getAction() == MotionEvent.ACTION_DOWN)
                            {
                                MediaPlayer mp = MediaPlayer.create(getBaseContext(), R.raw.kunfaya);
                                mp.start();
                                mp.setOnCompletionListener(new OnCompletionListener()
                              {
                          public void onCompletion(MediaPlayer mp)
                            {
                                                mp.release();
                             }
                               });
                                    }
                          return true;
                       }
               });
         }
          }


      // Source Code of  main.xml :


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

                        <TextView
                               android:layout_width="fill_parent"
                               android:layout_height="wrap_content"
                               android:text="@string/hello" />
   
                                    <Button
                                             android:id="@+id/playSound"
                                             android:layout_width="80dp"
                                             android:layout_height="wrap_content"
                                             android:layout_marginTop="170dp"
                                             android:layout_marginLeft="20dp"
                                             android:layout_gravity="center"
                                             android:background="@drawable/btnscreen"/>
   
                                   <MediaController 
                                             android:id="@raw/kunfaya"
                                             android:layout_width="fill_parent"
                                             android:layout_height="wrap_content"/>

          </LinearLayout>




 Output :

After Clicking on Play Button , Song plays

Note : Uploading and installation of .apk will be depend on audio file size , it may be take too much time so don't irritate, just wait.





   

 Browser Calling in Android :


# We have to open an URL as "www.google.com" by calling android browser : 

• Create a new project named as "InternetSurf" and class name will be such as "InternetSurfActivity.java".
• Create an xml file named as "mywebview.xml" and copy and paste below code to this xml file.

  // Source Code of  registration.xml :

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

                              <TextView
                                        android:layout_width="fill_parent"
                                        android:layout_height="wrap_content"
                                        android:text="@string/hello" />

                                            <WebView
                                                       android:id="@+id/mywebview"
                                                       android:layout_width="fill_parent"
                                                       android:layout_height="fill_parent" />
 
      </LinearLayout>


  // Source Code of  InternetSurfActivity.xml :

package com.myApp.InternetSurf;
import android.webkit.WebView;
import android.app.Activity;
import android.os.Bundle;

public class InternetSurfActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
     
        WebView wv=(WebView) findViewById(R.id.mywebview);
        wv.loadUrl("http://www.google.com");
    }
}






Output :