Android Listeners and Toasts
/This video, part of my Android Quick Code Access series of posts, explains Android Listeners and Toasts. It's from my course Learning Android App Programming published by InfiniteSkills.
The Java code for the example is below...
import java.util.Random;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class ListenerToastMain extends Activity {
// onCreate method.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Initialize display.
setContentView(R.layout.main);
// Declare button variable for Get Answer.
Button getAnswer =
(Button)findViewById(R.id.getAnswerButton);
// Set listener for button.
getAnswer.setOnClickListener(getAnswerListener);
}
// Define OnClickListener for getAnswer button.
private OnClickListener getAnswerListener = new OnClickListener() {
public void onClick(View v){
// Generate answer number.
Random toastGen = new Random();
int toastNum = toastGen.nextInt(19);
toastNum++;
// Get answer text.
CharSequence text = "";
switch (toastNum) {
case 1: text = getString(R.string.answer1); break;
case 2: text = getString(R.string.answer2); break;
case 3: text = getString(R.string.answer3); break;
case 4: text = getString(R.string.answer4); break;
case 5: text = getString(R.string.answer5); break;
case 6: text = getString(R.string.answer6); break;
case 7: text = getString(R.string.answer7); break;
case 8: text = getString(R.string.answer8); break;
case 9: text = getString(R.string.answer9); break;
case 10: text = getString(R.string.answer10); break;
case 11: text = getString(R.string.answer11); break;
case 12: text = getString(R.string.answer12); break;
case 13: text = getString(R.string.answer13); break;
case 14: text = getString(R.string.answer14); break;
case 15: text = getString(R.string.answer15); break;
case 16: text = getString(R.string.answer16); break;
case 17: text = getString(R.string.answer17); break;
case 18: text = getString(R.string.answer18); break;
case 19: text = getString(R.string.answer19); break;
case 20: text = getString(R.string.answer20); break;
}
// Toast answer.
Context context = getApplicationContext();
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
};
}
