Android Notification如何实现动态显示通话时间

Android Notification如何实现动态显示通话时间，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。

基于android N MTK释放的源码，供大家参考，具体内容如下

主要思路

1、我们需要知道通话建立时的时间，即call 的状态从 INCOMING或者DIALING 转变成ACTIVE的时候
2、时间每秒钟都会发生变化，所以我们就需要不停的更新notification的界面，我们这里是不停的创建和notify同一个notification，已到达更新时间的效果
3、我们需要CallTimer线程不停的帮我们计算时间，并控制界面的更新

代码实现

这里是在源码incallUI目录下的StatusBarNotifier.java中修改

....省略部分代码    //震动时长，这里为不振动    private static final long[] IN_CALL_VIBRATE_PATTERN_NULL = new long[] {0, 0, 0};    //线程隔多久执行一次已ms为单位，这里为1S    private static final long CALL_TIME_UPDATE_INTERVAL_MS = 1000;    //我们需要获取一些全局的变量，已到达不停的创建notification并更新同一个notification的UI    private CallTimer mCallTimer;    private Notification.Builder mCopyBuilder;    private int  mCopyCallState;    private ContactCacheEntry mCopyContactInfo;    private int mCopyNotificationType; //当前notification的ID,通过这个ID我们可以一直更新同一个notification并且只会弹出一次    private Bitmap mCopyLargeIcon;    public StatusBarNotifier(Context context, ContactInfoCache contactInfoCache) {        .......省略部分代码        //StatusBarNotifier初始化的时候就创建CallTimer对象，用来计算时间和更新UI        mCallTimer = new CallTimer(new Runnable() {            @Override            public void run() {                updateCallTime(); //更新UI的函数            }        });    }    @Override    public void onStateChange(InCallState oldState, InCallState newState, CallList callList) {        if (callList.getActiveCall() == null || callList.getActiveCall().getState() != Call.State.ACTIVE){            //当通话结束时需要取消计算时间的线程            mCallTimer.cancel();        }    }    //系统构建notification的方法    private void buildAndSendNotification(Call originalCall, ContactCacheEntry contactInfo) {        ....省略部分代码        else if (callState == Call.State.ACTIVE && !mIsCallUiShown) {            //保存一个公共的变量到全部变量里面，方便后面构造新的notification并刷新            copyInfoFromHeadsUpView(builder, callState, contactInfo, notificationType, largeIcon);            //下面是计算显示的时间            final long callStart = call.getConnectTimeMillis();            final long duration = System.currentTimeMillis() - callStart;            //创建一个HeadsUpView显示在notification上面            RemoteViews inCall = createInCallHeadsUpView(duration / 1000, largeIcon);            builder.setContent(inCall);            builder.setCustomHeadsUpContentView(inCall);            //系统原生的方法最后notify通知            fireNotification(builder, callState, contactInfo, notificationType);            //开始我们的计时线程            mCallTimer.start(CALL_TIME_UPDATE_INTERVAL_MS);        }        .....省略部分代码    }    private RemoteViews createInCallHeadsUpView(Long callDuration, Bitmap contactAvatar) {        RemoteViews headsUpView = new RemoteViews(mContext.getPackageName(), R.layout.in_call_headsup);        if (null != contactAvatar) {            headsUpView.setImageViewBitmap(R.id.in_call_hu_avatar, contactAvatar);        }        //格式化时间        String callTimeElapsed = DateUtils.formatElapsedTime(callDuration);        headsUpView.setTextViewText(R.id.in_call_hu_elapsedTime, callTimeElapsed);        return headsUpView;    }    /*according the mCallTimer to update time data*/    public void updateCallTime() {        Call call = CallList.getInstance().getActiveCall();        final long callStart = call.getConnectTimeMillis();        final long duration = System.currentTimeMillis() - callStart;        RemoteViews inCall = createInCallHeadsUpView(duration / 1000, mCopyLargeIcon);        mCopyBuilder.setContent(inCall);        mCopyBuilder.setCustomHeadsUpContentView(inCall);        Notification notification = mCopyBuilder.build();        notification.vibrate = IN_CALL_VIBRATE_PATTERN_NULL;        mNotificationManager.notify(mCopyNotificationType, notification);    }    /*Change local variables  to global variables*/    private void copyInfoFromHeadsUpView(Notification.Builder builder, int callState, ContactCacheEntry contactInfo,                          int notificationType, Bitmap largeIcon){        mCopyBuilder = builder;        mCopyCallState = callState;        mCopyContactInfo = contactInfo;        mCopyNotificationType = notificationType;        mCopyLargeIcon = largeIcon;    }........省略部分代码

CallTimer源码如下

package com.android.incallui;import com.google.common.base.Preconditions;import android.os.Handler;import android.os.SystemClock;/** * Helper class used to keep track of events requiring regular intervals. */public class CallTimer extends Handler {    private Runnable mInternalCallback;    private Runnable mCallback;    private long mLastReportedTime;    private long mInterval;    private boolean mRunning;    public CallTimer(Runnable callback) {        Preconditions.checkNotNull(callback);        mInterval = 0;        mLastReportedTime = 0;        mRunning = false;        mCallback = callback;        mInternalCallback = new CallTimerCallback();    }    public boolean start(long interval) {        if (interval <= 0) {            return false;        }        // cancel any previous timer        cancel();        mInterval = interval;        mLastReportedTime = SystemClock.uptimeMillis();        mRunning = true;        periodicUpdateTimer();        return true;    }    public void cancel() {        removeCallbacks(mInternalCallback);        mRunning = false;    }    private void periodicUpdateTimer() {        if (!mRunning) {            return;        }        final long now = SystemClock.uptimeMillis();        long nextReport = mLastReportedTime + mInterval;        while (now >= nextReport) {            nextReport += mInterval;        }        postAtTime(mInternalCallback, nextReport);        mLastReportedTime = nextReport;        // Run the callback        mCallback.run();    }    private class CallTimerCallback implements Runnable {        @Override        public void run() {            periodicUpdateTimer();        }    }}

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