Android 计时器

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public class MainActivity extends Activity {    private Handler handler = new Handler();    /**     * 循环次数     */    private int cycleIndex=0;    private Runnable runnable;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        TextView textView=(TextView) findViewById(R.id.textView);        textView.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                Log.d("myf", "点击了停止计时器");                stopRunnable(runnable);                         }        });         runnable = new Runnable() {            @Override            public void run() {                cycleIndex++;                // 要做的事情                Log.d("myf", "====="+cycleIndex);                handler.postDelayed(this, 2000);                setTimeStopRunnable(cycleIndex);            }        };        handler.postDelayed(runnable, 2000);// 每两秒执行一次runnable.    }    /**     *      * 设置时间停止计时器     * @param time 表示循环次数     */    private void setTimeStopRunnable(int cycleIndex) {        if (cycleIndex>=5) {            stopRunnable(runnable);        }    }    /**     * 停止计时器     * @param runnable     */    private void stopRunnable(Runnable runnable) {        handler.removeCallbacks(runnable);    }}
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