Question

我正在创建一个使用CountDownTimer的应用。我想使用Service方法在后台正确使用CountDownTimer。

但是，在我的代码实现中，它无法正常工作。

服务不会在Toast中显示文本，也不会向活动发送正确的意图。我应该在MyService类中使用CountDownTimer的这段代码吗？有人可以帮我这个吗？

这是 MainActivity.java

public class MainActivity extends ActionBarActivity {

    Button btnStart, btnStop;
    TextView textViewTime;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnStart = (Button) findViewById(R.id.btnStart);
        btnStop = (Button) findViewById(R.id.btnStop);
        textViewTime = (TextView) findViewById(R.id.textViewTime);

        textViewTime.setText("00:01:30");

        final CounterClass timer = new CounterClass(90000, 1000);
        btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                timer.start();
            }
        });

        btnStop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                timer.cancel();
            }
        });
        }

    public class CounterClass extends CountDownTimer {

        public CounterClass(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }

        @Override
        public void onTick(long millisUntilFinished) {
            long millis = millisUntilFinished;
            String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis),
                    TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
                    TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
            System.out.println(hms);
            textViewTime.setText(hms);

        }

        @Override
        public void onFinish() {
            textViewTime.setText("Completed.");
        }
    }

    public void startService(View view)
    {
        Intent intent = new Intent(this,MyService.class);
        startService(intent);
    }

    public void stopService(View view)
    {
        Intent intent = new Intent(this,MyService.class);
        stopService(intent);
    }


}

这是 MyService.java

public class MyService extends Service {



    @Override
    public void onCreate() { // initial performance (setup service in this method)
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {  // create start a service

        Toast.makeText(this,"Service Started...",Toast.LENGTH_LONG).show();



        return START_STICKY;
        //return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {  // stop a service

        Toast.makeText(this,"Service Destroyed...", Toast.LENGTH_LONG).show();

        //super.onDestroy();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {  
        return null;
    }
}

Answer 1

 btnStart.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
startService(v);
            timer.start();
        }
    });

    btnStop.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
stopService(v);
            timer.cancel();
        }
    });
    }

服务在CountDownTimer中无法正常工作

1 个答案: