为什么我得到 "Cannot resolve method scheduleAtFixedRate"？

Question

我不知道为什么会收到此错误。对于我在 class TimerTask 中看到的所有示例，这应该不会造成问题。

public class CountUp extends AppCompatActivity {

EditText upText = (EditText) findViewById(R.id.Up);
int counter = 0;
float StartTime = 0;
float OffsetTime = 1000;    //Offset time is the time between event. 1000 is going to be our milliseconds (1 second)

TimerTask tt = new TimerTask() {
    @Override
    public void run() {
        upText.setText(counter);
        counter++;
    }
};

public void CountUp(View view){
    try {
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(tt,StartTime,OffsetTime); <--- //This is were I am receiving an error
    }catch (Exception e){

    }
}

Answer 1

用这个替换你的整个代码：

public class CountUp extends AppCompatActivity {

    EditText upText;
    TimerTask tt;
    int counter = 0;

    //startTime and offsetTime must be long and not float.
    long startTime = 0;
    long offsetTime = 1000;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //Change this to your current layout.
        setContentView(R.layout.main_activity);

        upText = (EditText) findViewById(R.id.Up);

        tt = new TimerTask() {
            @Override
            public void run() {
                upText.setText(String.valueOf(counter));
                counter++;
            }
        };
    }

    public void countUp(View view) {
        try {
            Timer timer = new Timer();
            timer.scheduleAtFixedRate(tt, startTime, offsetTime);
        } catch (Exception e) {

        }
    }
}

为什么我得到 "Cannot resolve method scheduleAtFixedRate"？

Why do I get "Cannot resolve method scheduleAtFixedRate"?

android

class

timertask