public static boolean isValid(String email) {
 
    String expression = "^[\\w\\.-]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
    CharSequence inputStr = email;
    Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher(inputStr);
    if (matcher.matches()) {
        return true;
    }
    else{
    return false;
    }
}

// Show soft-keyboard:
 InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
 imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
 
// Hide soft-keyboard:
 getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(myEditText.getWindowToken(), 0);

public class SerializeClass {
 public static byte[] serializeObject(Object o) { 
    ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
 
    try { 
      ObjectOutput out = new ObjectOutputStream(baos); 
      out.writeObject(o); 
      out.close(); 
 
      // Get the bytes of the serialized object 
      byte[] buffer = baos.toByteArray(); 
 
      return buffer; 
    } catch(IOException ioe) { 
 
      return null; 
    } 
 }
 public static Object deserializeObject(byte[] b) { 
    try { 
      ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(b)); 
      Object object = in.readObject(); 
      in.close(); 
 
      return object; 
    } catch(ClassNotFoundException cnfe) { 
      Log.e("deserializeObject", "class not found error", cnfe); 
 
      return null; 
    } catch(IOException ioe) { 
      Log.e("deserializeObject", "io error", ioe); 
 
      return null; 
    } 
  } 
}

public class MyClass implements Serializable {
 String text;
 
MyClass myClass = new MyClass();
byte[] binaryObject = SerializeClass.serializeObject(myClass);
MyClass deserializedMyClass = SerializeClass.deserializeObject(binaryObject);

  int maxLength = 50;
  InputFilter[] FilterArray = new InputFilter[1];
  FilterArray[0] = new InputFilter.LengthFilter(maxLength);
  editText.setFilters(FilterArray);

  @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        getMenuInflater().inflate(R.menu.edit_route_context_menu, menu);
        //below line is the key line. you write this and in info variable you have the position wished
        AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
        int position = info.position;//do what you want with the position
    }

import java.util.Timer;
import java.util.TimerTask;
 
import android.app.Activity;
import android.app.Dialog;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
 
public class MyApp extends Activity {
    Timer test;
    int ticks = 0;
    boolean counting = false;
    Dialog dialog;
    TextView text1;
    TextView text2;
    ProgressBar mProgress;
 
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
 
        //Create new daemon timer
        test = new Timer(true);
        test.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                TimerMethod();
                }//run
            }, 1000, 1000);//schedule
 
        Button start = (Button)findViewById(R.id.button_start);
        start.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                ticks = 0;
                counting = true;
                dialog = new Dialog(MyApp.this);
                dialog.setContentView(R.layout.custom_dialog);
                dialog.setTitle("Load Progress");
                mProgress = (ProgressBar) dialog.findViewById(R.id.progressbar);
                text1 = (TextView) dialog.findViewById(R.id.text1);
                text1.setText("0%");
                text2 = (TextView) dialog.findViewById(R.id.text2);
                text2.setText("0Mb/0Mb");
                dialog.show();
 
                }
            });
        }
    private void TimerMethod() {
        //This method is called directly by the timer
        //and runs in the same thread as the timer.
 
        //We call the method that will work with the UI
        //through the runOnUiThread method.
        this.runOnUiThread(Timer_Tick);
        }//timermethod
 
    private Runnable Timer_Tick = new Runnable() {
        public void run() {
            //This method runs in the same thread as the UI.
            //Do something to the UI thread here
        	if (counting) {
        	    ticks++;
        	    int percent = (int)(100f * ((float)ticks/10f));
        	    String newRatio = String.format("%1$dMb/%2$dMb", ticks, 10); 
        	    String newPercent = String.format("%1$d%%", percent);
        	    text1.setText(newPercent);
        	    text2.setText(newRatio);
        	    mProgress.setMax(10);
        	    mProgress.setProgress(ticks);   
        	    if (ticks == 10) {
        	    	counting = false;
        	    	dialog.dismiss();
        	        }//ending
        	    }//counting
 
            }//run
        };//runnable
 
    //TODO: Fill In Methods Etc.
    }//class

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/layout_root" android:orientation="vertical"
 android:layout_width="fill_parent" android:layout_height="wrap_content" 
android:padding="10dp">
  <ProgressBar android:id="@+id/progressbar"
 android:layout_width="fill_parent" android:layout_height="wrap_content"
 style="@android:style/Widget.ProgressBar.Horizontal" android:paddingTop="20dp" 
android:paddingBottom="20dp" /> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" android:layout_height="wrap_content"
 android:padding="10dp">
  <TextView android:id="@+id/text1" android:layout_width="wrap_content"
 android:layout_height="wrap_content" android:textColor="#FFF" 
android:layout_alignParentLeft="true" /> 
  <TextView android:id="@+id/text2" android:layout_width="wrap_content"
 android:layout_height="wrap_content" android:textColor="#FFF"
 android:layout_alignParentRight="true" /> 
  </RelativeLayout>
  </LinearLayout>