Android使用Thread加Handler实现计时与保持屏幕唤醒不熄灭

这两天工作比较忙，没有时间更新博客。今天难得闲下来，总结一下之前写的一个Demo，用到了两个小知识点：一是使用Thread加Handler实现计时，二是控制屏幕唤醒不熄灭。

首先是计时，首先我使用单纯的Handler来实现计时，代码如下：

Handler handler = new Handler();
    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            timeSec ++;
            mTimeCount.setText("" + timeSec);
            handler.postDelayed(this, 1000);
        }
    };

new Thread(new TimeThread()).start();

final Handler handler = new Handler() {         
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 1:
                    timeSec++;
                    if (timeSec < 60) {  // 1分钟以下情况
                        mTimeCount.setText("总耗时：" + timeSec + "秒");
                    } else if (timeSec < 3600) {  // 1小时以下情况
                        int minutes = timeSec / 60;
                        int second = timeSec % 60;
                        mTimeCount.setText("总耗时：" + minutes + "分" + second + "秒");
                    } else {
                        int hours = timeSec / 3600;
                        int minutes = (timeSec - hours * 3600) / 60;
                        int second = timeSec % 60;
                        mTimeCount.setText("总耗时：" + hours + "时" + minutes + "分" + second + "秒");
                    }

            }
            super.handleMessage(msg);
        }
    };

下面看一下保持屏幕唤醒的逻辑：

private static PowerManager.WakeLock wakeLock;

  public static void keepScreenOn(Context context, boolean on) {
        if (on) {
            PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
            wakeLock = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE, "==KeepScreenOn==");
            wakeLock.acquire();
        } else {
            if (wakeLock != null) {
                wakeLock.release();
                wakeLock = null;
            }
        }
    }

  @Override
    protected void onDestroy() {
        super.onDestroy();
        keepScreenOn(Main.this, false);
    }