java.lang.IllegalStateException：已計划TimerTask

Question

Timer出現問題，顯示此錯誤。 我有一個安排TimerTask的Timer （關閉）。 然后，在TimerTask內部，我安排下一個TimerTask ，依此類推。 據我了解，這應該可行，但是當我運行它時，該應用程序出現“ Stopped Working”錯誤。

levelCreationTimer.schedule(close, 1000); <=這在OnCreate中被調用。

Timer levelCreationTimer = new Timer();
TimerTask close = new TimerTask() {
    @Override
    public void run() {
        if (points < 10) {
            switch (randNum.nextInt(2)) {
                case 0:
                    locationBlimps[0][0] = 0;
                    locationBlimps[0][1] = 0;
                    locationBlimps[1][0] = -1;
                    break;
                case 1:
                    locationBlimps[0][0] = 4;
                    locationBlimps[0][1] = 4;
                    locationBlimps[1][0] = -1;
                    break;
            }
        }
        int i = 0;
        while (locationBlimps[i][0] != -1) {
            final int final_i = i;
            runOnUiThread(new Runnable() {
                public void run() {
                    sky[locationBlimps[final_i][1]][locationBlimps[final_i][0]].setBackgroundResource(R.drawable.scissors);
                }
            });
            i++;
        }
        levelCreationTimer.schedule(far, 1000);
    }
};
TimerTask far = new TimerTask() {
    @Override
    public void run() {
        int j = 0;
        while (locationBlimps[j][0] != -1) {
            final int final_j = j;
            runOnUiThread(new Runnable() {
                public void run() {
                    sky[locationBlimps[final_j][1]][locationBlimps[final_j][0]].setBackgroundResource(R.drawable.scissors);
                    obstacles[locationBlimps[final_j][1]][locationBlimps[final_j][0]] = true;
                }
            });
            j++;
        }
        levelCreationTimer.schedule(last, 1000);
    }
};
TimerTask last = new TimerTask() {
    @Override
    public void run() {
        int k = 0;
        while (locationBlimps[k][0] != -1) {
            final int final_k = k;
            runOnUiThread(new Runnable() {
                public void run() {
                    sky[locationBlimps[final_k][1]][locationBlimps[final_k][0]].setBackgroundResource(R.drawable.sky);
                    obstacles[locationBlimps[final_k][1]][locationBlimps[final_k][0]] = false;
                }
            });
            k++;
        }
        levelCreationTimer.schedule(close, 10000);
    }
};

我也嘗試添加

        levelCreationTimer.cancel();
        levelCreationTimer = new Timer();

在每個schedule之前schedule順序刪除日程表，但是並不能解決問題。

Answer 1

我通過創建擴展TimerTask類解決了該問題，然后安排了這些類的實例。

class MyClass1 extends TimerTask {
    @Override
    public void run()
    {
        //my code
        levelCreationTimer.schedule(new MyClass2(),1000);
        //scheduling the next TimerTask ^
    }
}
class MyClass2 extends TimerTask {
    @Override
    public void run()
    {
        //my code
        levelCreationTimer.schedule(new MyClass1(),1000);
        //scheduling the next TimerTask ^
    }
}