从appWidget开启系统自带AlarmClock

Since: API Level 9  有了统一的方法：

if(Build.VERSION.SDK_INT >=9){
Intent intentClock= new Intent();
intentClock.setAction(AlarmClock.ACTION_SET_ALARM);
return PendingIntent.getActivity(context, 0, intentClock, 0);
}

此时注意添加权限：com.android.alarm.permission.SET_ALARM

之前的就比较混乱：

PackageManager packageManager = context.getPackageManager();
Intent alarmClockIntent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER);
// Verify clock implementation
String clockImpls[][] = {
{"HTC Alarm Clock", "com.htc.android.worldclock", "com.htc.android.worldclock.WorldClockTabControl" },
{"Standar Alarm Clock", "com.android.deskclock", "com.android.deskclock.AlarmClock"},
{"Froyo Nexus Alarm Clock", "com.google.android.deskclock", "com.android.deskclock.DeskClock"},
{"Moto Blur Alarm Clock", "com.motorola.blur.alarmclock",  "com.motorola.blur.alarmclock.AlarmClock"},
{"Samsung Galaxy Clock", "com.sec.android.app.clockpackage","com.sec.android.app.clockpackage.ClockPackage"},
{"google 2.1 Clock", "com.android.deskclock","com.android.deskclock.DeskClock"},
{"emulator 2.1 Clock", "com.android.alarmclock","com.android.alarmclock.AlarmClock"}
};

boolean foundClockImpl = false;

for(int i=0; i<clockImpls.length; i++) {
String vendor = clockImpls[i][0];
String packageName = clockImpls[i][1];
String className = clockImpls[i][2];
try {
ComponentName cn = new ComponentName(packageName, className);
ActivityInfo aInfo = packageManager.getActivityInfo(cn, PackageManager.GET_META_DATA);
alarmClockIntent.setComponent(cn);
Log.v(TAG,"Found " + vendor + " --> " + packageName + "/" + className);
foundClockImpl = true;
} catch (NameNotFoundException e) {
Log.v(TAG,vendor + " does not exists");
}
}

if (foundClockImpl) {
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, alarmClockIntent, 0);
return pendingIntent;
}else{
return null;
}

部分来自网络，没有一一验证。

完整函数：

// 获取闹钟的PendingIntent
private PendingIntent getClockPendingIntent() {

if(Build.VERSION.SDK_INT >=9){
Intent intentClock= new Intent();
intentClock.setAction(AlarmClock.ACTION_SET_ALARM);
return PendingIntent.getActivity(context, 0, intentClock, 0);
}
Log.v(TAG,"SDK_INT:" + Build.VERSION.SDK_INT);

PackageManager packageManager = context.getPackageManager();
Intent alarmClockIntent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER);
// Verify clock implementation
String clockImpls[][] = {
{"HTC Alarm Clock", "com.htc.android.worldclock", "com.htc.android.worldclock.WorldClockTabControl" },
{"Standar Alarm Clock", "com.android.deskclock", "com.android.deskclock.AlarmClock"},
{"Froyo Nexus Alarm Clock", "com.google.android.deskclock", "com.android.deskclock.DeskClock"},
{"Moto Blur Alarm Clock", "com.motorola.blur.alarmclock",  "com.motorola.blur.alarmclock.AlarmClock"},
{"Samsung Galaxy Clock", "com.sec.android.app.clockpackage","com.sec.android.app.clockpackage.ClockPackage"},
{"google 2.1 Clock", "com.android.deskclock","com.android.deskclock.DeskClock"},
{"emulator 2.1 Clock", "com.android.alarmclock","com.android.alarmclock.AlarmClock"}
};

boolean foundClockImpl = false;

for(int i=0; i<clockImpls.length; i++) {
String vendor = clockImpls[i][0];
String packageName = clockImpls[i][1];
String className = clockImpls[i][2];
try {
ComponentName cn = new ComponentName(packageName, className);
ActivityInfo aInfo = packageManager.getActivityInfo(cn, PackageManager.GET_META_DATA);
alarmClockIntent.setComponent(cn);
Log.v(TAG,"Found " + vendor + " --> " + packageName + "/" + className);
foundClockImpl = true;
} catch (NameNotFoundException e) {
Log.v(TAG,vendor + " does not exists");
}
}

if (foundClockImpl) {
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, alarmClockIntent, 0);
return pendingIntent;
}else{
return null;
}
}