default behaviour of alert dialog android code example

Example 1: alertdialog show in android

AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage(getResources().getString(R.string.do_you_really_want_to_signout));
        builder.setTitle(getResources().getString(R.string.sign_out));
        builder.setCancelable(false);
        builder.setNegativeButton(getResources().getString(R.string.cancel), new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });
        builder.setPositiveButton(getResources().getString(R.string.sure), new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(AccountActivity.this, R.string.log_out_success,
                        Toast.LENGTH_LONG).show();
               
            }
        });

        AlertDialog alert = builder.create();
        alert.show();

Example 2: android dialog box example

runOnUiThread(new Runnable() {
    @Override
    public void run() {

        if (!isFinishing()){
            new AlertDialog.Builder(YourActivity.this)
              .setTitle("Your Alert")
              .setMessage("Your Message")
              .setCancelable(false)
              .setPositiveButton("ok", new OnClickListener() {
                  @Override
                  public void onClick(DialogInterface dialog, int which) {
                      // Whatever...
                  }
              }).show();
        }
    }
});