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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.incallui;
     18 
     19 import com.google.common.base.Preconditions;
     20 
     21 import android.os.Handler;
     22 import android.os.SystemClock;
     23 
     24 /**
     25  * Helper class used to keep track of events requiring regular intervals.
     26  */
     27 public class CallTimer extends Handler {
     28     private Runnable mInternalCallback;
     29     private Runnable mCallback;
     30     private long mLastReportedTime;
     31     private long mInterval;
     32     private boolean mRunning;
     33 
     34     public CallTimer(Runnable callback) {
     35         Preconditions.checkNotNull(callback);
     36 
     37         mInterval = 0;
     38         mLastReportedTime = 0;
     39         mRunning = false;
     40         mCallback = callback;
     41         mInternalCallback = new CallTimerCallback();
     42     }
     43 
     44     public boolean start(long interval) {
     45         if (interval <= 0) {
     46             return false;
     47         }
     48 
     49         // cancel any previous timer
     50         cancel();
     51 
     52         mInterval = interval;
     53         mLastReportedTime = SystemClock.uptimeMillis();
     54 
     55         mRunning = true;
     56         periodicUpdateTimer();
     57 
     58         return true;
     59     }
     60 
     61     public void cancel() {
     62         removeCallbacks(mInternalCallback);
     63         mRunning = false;
     64     }
     65 
     66     private void periodicUpdateTimer() {
     67         if (!mRunning) {
     68             return;
     69         }
     70 
     71         final long now = SystemClock.uptimeMillis();
     72         long nextReport = mLastReportedTime + mInterval;
     73         while (now >= nextReport) {
     74             nextReport += mInterval;
     75         }
     76 
     77         postAtTime(mInternalCallback, nextReport);
     78         mLastReportedTime = nextReport;
     79 
     80         // Run the callback
     81         mCallback.run();
     82     }
     83 
     84     private class CallTimerCallback implements Runnable {
     85         @Override
     86         public void run() {
     87             periodicUpdateTimer();
     88         }
     89     }
     90 }
     91