Android关机闹钟实现

时间转换网站：http://tool.chinaz.com/Tools/unixtime.aspx

１、apk层

这个还是比较简单的，百度一下就可以看到apk的代码，我之前也有贴出来过还是看一下核心代码吧。

写好的apk（里面有Android.mk文件　加入system/app/下面进行编译）：http://download.csdn.net/detail/weiqifa0/9237021

package com.example.helloworld;import java.util.Calendar;import android.os.Bundle;import android.app.Activity;import android.app.AlarmManager;import android.app.PendingIntent;import android.app.Service;import android.app.TimePickerDialog;import android.content.Context;import android.content.Intent;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TimePicker;import android.widget.Toast;public class AlarmTest extends Activity{Button setTime;AlarmManager aManager;Calendar currentTime = Calendar.getInstance();public static final int POWER_OFF_WAKE_UP = 8;//用来设置关机启动的参数　平台这边已经设置好了@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Log.e("weiqifa", test());setTime = (Button) findViewById(R.id.setTime);aManager=(AlarmManager)AlarmTest.this.getSystemService(Service.ALARM_SERVICE);setTime.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View source){Calendar currentTime = Calendar.getInstance();new TimePickerDialog(AlarmTest.this, 0, new TimePickerDialog.OnTimeSetListener(){@Overridepublic void onTimeSet(TimePicker tp,int hourOfDay, int minute){Intent intent = new Intent(AlarmTest.this,AlarmActivity.class);PendingIntent pi = PendingIntent.getActivity(AlarmTest.this, 0, intent, 0);Calendar c = Calendar.getInstance();c.set(Calendar.HOUR, hourOfDay);c.set(Calendar.MINUTE, minute);Log.v("weiqifa", "c.getTimeMillis()"+c.getTimeInMillis());//aManager.setExact(POWER_OFF_WAKE_UP,c.getTimeInMillis(), pi);aManager.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP,c.getTimeInMillis(), pi);Toast.makeText(AlarmTest.this, "设置闹钟成功", Toast.LENGTH_SHORT).show();Log.e("weiqifa", "set the clock success!");}}, currentTime.get(Calendar.HOUR_OF_DAY), currentTime.get(Calendar.MINUTE), false).show();}});}public native String  test();static {try{Log.i("JNI", "Trying to load libhelloworld.so");System.loadLibrary("helloWorld");}catch(UnsatisfiedLinkError ule){Log.e("JNI", "Warning : could not load the libhelloworld.so");}}}</span>

好了关键就是　aManager.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP,c.getTimeInMillis(), pi);

这句代码

２、AlarmManager和AlarmManagerService

他们一个是客户端一个是服务端　他们通过ipc　binder通信，我对这个还不是非常懂，但是有个网友总结的非常好

http://blog.csdn.net/jdsjlzx/article/details/20936709

３、JNI　要想达到关机闹钟的功能就一定要调用JNI

public void setExact(int type, long triggerAtMillis, PendingIntent operation) {     Log.i(TAG,"setExact"+type);        setImpl(type, triggerAtMillis, WINDOW_EXACT, 0, operation, null);    }</span>

private void setImpl(int type, long triggerAtMillis, long windowMillis, long intervalMillis,            PendingIntent operation, WorkSource workSource) {            Log.i(TAG,"setImpl"+type);        if (triggerAtMillis < 0) {            /* NOTYET            if (mAlwaysExact) {                // Fatal error for KLP+ apps to use negative trigger times                throw new IllegalArgumentException("Invalid alarm trigger time "                        + triggerAtMillis);            }            */            triggerAtMillis = 0;        }        try {            mService.set(type, triggerAtMillis, windowMillis, intervalMillis, operation,                    workSource);        } catch (RemoteException ex) {        }    }

mService.set这个函数在服务端实现，所以要到AlarmManagerService里面去找到这个函数的实现，因为太长就不贴出来了

通过ＪＮＩ去设置闹钟,在AlarmManagerService里面有调用jni函数

public void scheduleTimeTickEvent() {            final long currentTime = System.currentTimeMillis();            final long nextTime = 60000 * ((currentTime / 60000) + 1);            // Schedule this event for the amount of time that it would take to get to            // the top of the next minute.            final long tickEventDelay = nextTime - currentTime;            final WorkSource workSource = null; // Let system take blame for time tick events.            set(ELAPSED_REALTIME, SystemClock.elapsedRealtime() + tickEventDelay, 0,                    0, mTimeTickSender, true, workSource);        }

    private native int init();    private native void close(int fd);    private native void set(int fd, int type, long seconds, long nanoseconds);    private native int waitForAlarm(int fd);    private native int setKernelTimezone(int fd, int minuteswest);</span>

里面的set(mDescriptor, 6, latestTime / 1000, (latestTime % 1000) * 1000 * 1000); 调用到jni里面的函数。

看到这个native就知道这是一个jni函数了吧

４、JNI通过ioctl去调用驱动里面的代码

这里是在./frameworks/base/services/jni/com_android_server_AlarmManagerService.cpp里面

static void android_server_AlarmManagerService_set(JNIEnv* env, jobject obj, jint fd, jint type, jlong seconds, jlong nanoseconds){    struct timespec ts;    ts.tv_sec = seconds;    ts.tv_nsec = nanoseconds;ALOGE("weiqifa type=%d set fd[%d]alarm to %lld.%09lld: %s\n",type,fd, seconds, nanoseconds, strerror(errno));int result = ioctl(fd, ANDROID_ALARM_SET(type), &ts);if (result < 0){        ALOGE("Unable to set alarm to %lld.%09lld: %s\n", seconds, nanoseconds, strerror(errno));    }}

５、驱动代码

static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg){int rv = 0;unsigned long flags;struct timespec new_alarm_time;struct timespec new_rtc_time;struct timespec tmp_time;struct rtc_time new_rtc_tm;struct rtc_device *rtc_dev;struct rtc_wkalrm pwron_alm;enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);uint32_t alarm_type_mask = 1U << alarm_type;printk("%s cmd=[0x%x] ANDROID_ALARM_IOCTL_TO_TYPE(cmd)=[%d]\n",__func__,cmd,ANDROID_ALARM_IOCTL_TO_TYPE(cmd)); if (alarm_type >= ANDROID_ALARM_TYPE_COUNT &&    alarm_type != ANDROID_ALARM_POWER_ON &&    alarm_type != ANDROID_ALARM_POWER_ON_LOGO) {return -EINVAL;}if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {if ((file->f_flags & O_ACCMODE) == O_RDONLY)return -EPERM;if (file->private_data == NULL &&    cmd != ANDROID_ALARM_SET_RTC) {spin_lock_irqsave(&alarm_slock, flags);if (alarm_opened) {spin_unlock_irqrestore(&alarm_slock, flags);return -EBUSY;}alarm_opened = 1;file->private_data = (void *)1;spin_unlock_irqrestore(&alarm_slock, flags);}}</span>

后面再调用到,mtk_rtc_hal.c里面

void hal_rtc_set_alarm_time(struct rtc_time *tm) {u16 irqen;dump_stack();printk("weiqifa read tc time = %04d/%02d/%02d (%d) %02d:%02d:%02d\n",          tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,          tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);hal_rtc_xinfo("a = %d\n",(rtc_read(RTC_AL_MTH)& (RTC_NEW_SPARE3))|tm->tm_mon);hal_rtc_xinfo("b = %d\n",(rtc_read(RTC_AL_DOM)& (RTC_NEW_SPARE1))|tm->tm_mday);hal_rtc_xinfo("c = %d\n",(rtc_read(RTC_AL_HOU)& (RTC_NEW_SPARE_FG_MASK))|tm->tm_hour);rtc_write(RTC_AL_YEA, tm->tm_year);rtc_write(RTC_AL_MTH, (rtc_read(RTC_AL_MTH) & (RTC_NEW_SPARE3))|tm->tm_mon);rtc_write(RTC_AL_DOM, (rtc_read(RTC_AL_DOM) & (RTC_NEW_SPARE1))|tm->tm_mday);rtc_write(RTC_AL_HOU, (rtc_read(RTC_AL_HOU) & (RTC_NEW_SPARE_FG_MASK))|tm->tm_hour);rtc_write(RTC_AL_MIN, tm->tm_min);rtc_write(RTC_AL_SEC, tm->tm_sec);rtc_write(RTC_AL_MASK, RTC_AL_MASK_DOW);/* mask DOW */rtc_write_trigger();irqen = rtc_read(RTC_IRQ_EN) | RTC_IRQ_EN_ONESHOT_AL;rtc_write(RTC_IRQ_EN, irqen);rtc_write_trigger();}

驱动的调用关系可以用dump_stack()来调试　

然后加载vmlinux可以定位到哪一行，

最后闹钟可以在手机关机的时候也能够响。

６、问题

通过上面的流程，基本上可以理通了整个思路，但是还是要修改一下代码，贴出git diff

a/frameworks/base/services/java/com/android/server/AlarmManagerService.java+++ b/frameworks/base/services/java/com/android/server/AlarmManagerService.java@@ -673,6 +673,7 @@ class AlarmManagerService extends IAlarmManager.Stub {              String setPackageName = null;             long nowTime = System.currentTimeMillis();+            Slog.d(TAG,"weiqifa nowTime="+nowTime+"  triggerAtTime="+triggerAtTime);             if (triggerAtTime < nowTime) {                 Slog.w(TAG, "power off alarm set time is wrong!");                 return;@@ -684,11 +685,12 @@ class AlarmManagerService extends IAlarmManager.Stub {                 Alarm alarm = new Alarm(type, triggerAtTime, 0, 0, 0, interval, operation, workSource);                 int index = addPoweroffAlarmLocked(alarm);                 if (index == 0) {+                                       Slog.w(TAG, "weiqifa==================1");                     resetPoweroffAlarm(alarm);                 }             }                 type = RTC_WAKEUP;-+                  Slog.w(TAG, "weiqifa==================2");         }         // /@} @@ -2095,7 +2097,12 @@ class AlarmManagerService extends IAlarmManager.Stub {             SystemProperties.set("persist.sys.bootpackage", "2"); // for                                                                   // poweronofftest             set(mDescriptor, 7, latestTime / 1000, (latestTime % 1000) * 1000 * 1000);-        } else {+        } else if(setPackageName.equals("com.example.helloworld")){+               Slog.i(TAG, "mBootPackage = " + setPackageName + " set Prop 1");+            SystemProperties.set("persist.sys.bootpackage", "1"); // for+                                                                  // helloworld test clock+            set(mDescriptor, 6, latestTime / 1000, (latestTime % 1000) * 1000 * 1000); +        }else {             Slog.w(TAG, "unknown package (" + setPackageName + ") to set power off alarm");         }         // [Note] Power off Alarm -(END)

这里要加上这个包的名字，要不然就设置不上去了。

apk里面的时间　是格林威治时间　这个可以网上百度一下

然后apk的日志打印出来的时间，如下图

kernel日志打印出来的时间如下图