Android应用程序崩溃，将textview设置为number

Question

Relative new to Android and Java programming. I have one TextView with the number 0 in, which will show the number as it get bigger or smaller. I also have two buttons, one to add, one to subtract, both call their own method, the ones below. When I launch this app, it crashes.

TextView numberView = (TextView) findViewById(R.id.textView);
int number = 0;

public void addNumber(View view) {
    number++;
    numberView.setText(number);
}

public void subtractNumber(View view) {
    number--;
    numberView.setText(number);
}

I also tried numberView.setText(Integer.toString(number));

Answer 1

If it wasn't a null pointer exception
Then you can do this numberView.setText(number+"")

Answer 2

尝试做：

numberView.setText(String.valueOf(number));