Android - Toast を使う -

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import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class ToastSample extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    findViewById(R.id.button_long).setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        Toast.makeText(ToastSample.this, "Show Toast Long", Toast.LENGTH_LONG)
             .show();
      }
    });

    findViewById(R.id.button_short).setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        Toast.makeText(ToastSample.this, "Show Toast Short", Toast.LENGTH_SHORT)
             .show();
      }
    });    
  }
}