Android L[Android5.X.X] 版本通过Intent隐式启动service时将会报出以下错误：

AndroidRuntime(  792): java.lang.IllegalArgumentException: Service Intent must be explicit

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详细信息：

01-02 07:52:44.736 D/PowerManagerService/SmartStandby(  792): sendDetectFaceIntent:com.wtk.smart.standby.DETECT_FACE_ACTION
01-02 07:52:44.738 W/ContextImpl(  792): Calling a method in the system process without a qualified user: android.app.ContextImpl.startService:1813 com.android.server.power.PowerManagerService.sendDetectFaceIntent:4155 com.android.server.power.PowerManagerService.handleDetectFaceCase:4137 com.android.server.power.PowerManagerService.access$4400:100 com.android.server.power.PowerManagerService$PowerManagerHandler.handleMessage:3306
01-02 07:52:44.744 E/AndroidRuntime(  792): *** FATAL EXCEPTION IN SYSTEM PROCESS: PowerManagerService
01-02 07:52:44.744 E/AndroidRuntime(  792): java.lang.IllegalArgumentException: Service Intent must be explicit: Intent { act=com.wtk.smart.standby.DETECT_FACE_ACTION (has extras) }
01-02 07:52:44.744 E/AndroidRuntime(  792):  at android.app.ContextImpl.validateServiceIntent(ContextImpl.java:1801)
01-02 07:52:44.744 E/AndroidRuntime(  792):  at android.app.ContextImpl.startServiceCommon(ContextImpl.java:1830)
01-02 07:52:44.744 E/AndroidRuntime(  792):  at android.app.ContextImpl.startService(ContextImpl.java:1814)
01-02 07:52:44.744 E/AndroidRuntime(  792):  at com.android.server.power.PowerManagerService.sendDetectFaceIntent(PowerManagerService.java:4155)
01-02 07:52:44.744 E/AndroidRuntime(  792):  at com.android.server.power.PowerManagerService.handleDetectFaceCase(PowerManagerService.java:4137)
01-02 07:52:44.744 E/AndroidRuntime(  792):  at com.android.server.power.PowerManagerService.access$4400(PowerManagerService.java:100)
01-02 07:52:44.744 E/AndroidRuntime(  792):  at com.android.server.power.PowerManagerService$PowerManagerHandler.handleMessage(PowerManagerService.java:3306)
01-02 07:52:44.744 E/AndroidRuntime(  792):  at android.os.Handler.dispatchMessage(Handler.java:111)
01-02 07:52:44.744 E/AndroidRuntime(  792):  at android.os.Looper.loop(Looper.java:194)
01-02 07:52:44.744 E/AndroidRuntime(  792):  at android.os.HandlerThread.run(HandlerThread.java:61)
01-02 07:52:44.744 E/AndroidRuntime(  792):  at com.android.server.ServiceThread.run(ServiceThread.java:46)
01-02 07:52:44.752 V/SettingsProvider(  792): call(global:dropbox:system_server_crash) for 0
01-02 07:52:44.753 D/SettingsProvider(  792): lookupValue table global cache.fullyMatchesDisk() dropbox:system_server_crash
01-02 07:52:44.757 V/SettingsProvider(  792): call(global:logcat_for_system_server_crash) for 0
01-02 07:52:44.757 D/SettingsProvider(  792): lookupValue table global cache.fullyMatchesDisk() logcat_for_system_server_crash

sdk\sources\android-21\android\app\ContextImpl.java

class ContextImpl extends Context {
 ......
    private void validateServiceIntent(Intent service) {
        if (service.getComponent() == null && service.getPackage() == null) {
            if (getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.LOLLIPOP) {
                IllegalArgumentException ex = new IllegalArgumentException(
                        "Service Intent must be explicit: " + service);
                throw ex;
            } else {
                Log.w(TAG, "Implicit intents with startService are not safe: " + service
                        + " " + Debug.getCallers(2, 3));
            }
        }
    }
 ......
}

上面源码中蓝色加粗部分：service.getComponent() == null && service.getPackage() == null

表明通过intent启动service时， 需要指定Intent的ComponentName信息：intent.setComponent(xxx)，或指定Intent的setPackage("包名")，如果两者都没有指定的话将会报以上错误。尤其在framework层启动APP层的service时，如果是隐式启动service，可能会导致系统进程挂掉，出现不断重启的现象。

Intent intent = new Intent();
    ComponentName componentName = new ComponentName(pkgName,serviceName);
    intent.setComponent(componentName);
    context.startService(intent);

Intent mIntent = new Intent();
mIntent.setAction("XXX.XXX.XXX");//Service能够匹配的Action
mIntent.setPackage(pkgName);//应用的包名
context.startService(mIntent);