Android实现计数器功能

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原创最新推荐文章于 2026-06-19 11:39:39 发布 6.5k 阅读 AI 写同款· GEO 优化 ›

[Android 笔记五] 使用Service实现计数器-（方式一：OnBind方式）题目：在Activity中启动Service，并在Service中实现一个计数器，该计数器每秒+1，且每隔60秒弹出一个Toast提示，基于以上实现，在通知栏实时显示计数器的值，并且在通知栏中添加退出按钮，点击后退出计数，并关闭通知栏一.OnBind方式启动Service 实现效果 MainActivity: public class MainActivity extends AppCompatActivity { private static final String 阅读详情

public class MainActivity extends Activity implements View.OnClickListener {

    private Button btnStart;
    private Button btnStop;
    private TextView textView;
    private Timer timer = new Timer();
    int cnt = 0;
    private EditText etTime;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btnStart = (Button) findViewById(R.id.btn_start);
        btnStop = (Button) findViewById(R.id.btn_stop);
        textView = (TextView) findViewById(R.id.textview);
        etTime = (EditText) findViewById(R.id.et_time);
        btnStart.setOnClickListener(this);
        btnStop.setOnClickListener(this);
        textView.setText("00:00:00");
    }  @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_start:
//                手动输入时间测试
//                String content = etTime.getText().toString();
//                String time = getStringTime(Integer.parseInt(content));
//                textView.setText(time);
//                System.out.println("当前秒数为："+time.substring(time.lastIndexOf(":")+1));
//                System.out.println("当前分钟数为："+time.substring(time.indexOf(":")+1,time.lastIndexOf(":")));
//                System.out.println("当前小时数为："+time.substring(0,time.indexOf(":")));
                TimerTask timerTask = new TimerTask() {
                    @Override
                    public void run() {
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                textView.setText(getStringTime(cnt++));
                            }
                        });
                    }
                };
                if (timer == null) {
                    timer = new Timer();
                }
                timer.schedule(timerTask,0,1000);
                break;
            case R.id.btn_stop:
                timer.cancel();
                timer = null;
                break;
        }
    }


    private String getStringTime(int cnt) {
        int hour = cnt/3600;
        int min = cnt % 3600 / 60;
        int second = cnt % 60;
        return String.format(Locale.CHINA,"%02d:%02d:%02d",hour,min,second);
    }
}