Toast 消息不起作用 android 应用程序 eclipse

Question

Toast message still not working any help please, runs fine but when no number entered and button is clicked app crashes and says unfortunately has stopped working. Just wanted to make my app more crash proof for users to enjoy more

code:

public class MainActivity extends Activity {

public static final String TAG = MainActivity.class.getCanonicalName();
TextView textOne;
TextView guessText;
EditText userGuess;
Button pushMe;
MediaPlayer applause;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    varSet();






    pushMe.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {


            Log.w(TAG, "Button Clicked");
            String randText = "";
            // TODO Auto-generated method stub
            Random randGen = new Random();
            int rando = randGen.nextInt(10) +1;

             if((guessText.getText().toString()).length() == 0)
                {
                    Toast.makeText(getApplicationContext(), "no number entered", Toast.LENGTH_SHORT).show();
                }
                else{

            int userNumber = Integer.parseInt(userGuess.getText().toString());


            if ( userNumber < 1 || userNumber > 10 ) {
                guessText.setText("Please guess 1 - 10");
            } else if ( userNumber == rando) {
                guessText.setText("You Got It Right!");
                if (applause.isPlaying()) {
                    applause.seekTo(0);
                } else {
                  applause.start();
                }
            } else {
                guessText.setText("Not quite, guess again!");
            }

            randText = Integer.toString(rando);
            textOne.setText(randText);

            userGuess.setText("");
        }
        }});

}


private void varSet() {
      textOne = (TextView) findViewById(R.id.textView1);
      guessText = (TextView) findViewById(R.id.textView2);
      userGuess = (EditText) findViewById(R.id.editText1);
      pushMe = (Button) findViewById(R.id.button1);
      applause = MediaPlayer.create(MainActivity.this, R.raw.applause);
}

Thank you any would be GREAT!!!

Answer 1

If you want to add a toast message, have a look at the Android developers guide http://developer.android.com/guide/topics/ui/notifiers/toasts.html (a good place to start for all your Android development related questions)

Which all starts with something like this:

Context context = getApplicationContext();
CharSequence text = "Hello toast!";
int duration = Toast.LENGTH_SHORT;

Toast toast = Toast.makeText(context, text, duration);
toast.show();

Answer 2

In your onClick method you can write this:

    OnClickListener buttonClickListener = new OnClickListener() {

        @Override
        public void onClick(View v) {

            if((guessText.getText().toString()).length() == 0)
            {
                Toast.makeText(getApplicationContext(), "no number entered", Toast.LENGTH_SHORT).show();
            }
            else{
                int userNumber = Integer.parseInt(userGuess.getText().toString());

                                     if ( userNumber < 1 || userNumber > 10 ) {
            guessText.setText("Please guess 1 - 10");
        } else if ( userNumber == rando) {
            guessText.setText("You Got It Right!");
            if (applause.isPlaying()) {
                applause.seekTo(0);
            } else {
              applause.start();
            }
        } else {
            guessText.setText("Not quite, guess again!");
        }

        randText = Integer.toString(rando);
        textOne.setText(randText);

        userGuess.setText("");
            }
        }
    };

    pushMe.setOnClickListener(buttonClickListener);

Answer 3

try below code :-

showToast(this, "your message");

public static void showToast(Activity activity, String msg)
{
    try
    {
        Toast toast = Toast.makeText(activity, msg, Toast.LENGTH_LONG);
        toast.getView().setBackgroundColor(activity.getResources().getColor(R.color.purple_dark));
        toast.show();
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}