Alert Dialog Two Buttons

try this

public void showDialog(Activity activity, String title, CharSequence message) {
    AlertDialog.Builder builder = new AlertDialog.Builder(activity);

    if (title != null) builder.setTitle(title);

    builder.setMessage(message);
    builder.setPositiveButton("OK", null);
    builder.setNegativeButton("Cancel", null);
    builder.show();
}

Adding Buttons

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Are you sure you want to exit?")
   .setCancelable(false)
   .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
       public void onClick(DialogInterface dialog, int id) {
            MyActivity.this.finish();
       }
   })
   .setNegativeButton("No", new DialogInterface.OnClickListener() {
       public void onClick(DialogInterface dialog, int id) {
            dialog.cancel();
       }
   });
AlertDialog alert = builder.create();
alert.show();

This should do the trick for you:

Button share = (Button) findViewById(R.id.btn_share);
share.setOnClickListener(new OnClickListener() {   
  public void onClick(View v) {
    // call some other methods before that I guess...
    AlertDialog alertDialog = new AlertDialog.Builder(PasswActivity.this).create(); //Read Update
    alertDialog.setTitle("Uprgade");
    alertDialog.setMessage("Upgrade Text Here");
    alertDialog.setButton( Dialog.BUTTON_POSITIVE, "Upgrade", new DialogInterface.OnClickListener() {
       public void onClick(DialogInterface dialog, int which) {

       });

    alertDialog.setButton( Dialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener()    {
      public void onClick(DialogInterface dialog, int which) {

      });

    alertDialog.show();  //<-- See This!
  }
});