Service错误

错误日志：

 Caused by: java.lang.IllegalArgumentException: Service Intent must be explicit: Intent { act=m4 (has extras) }
                                                                              at android.app.ContextImpl.validateServiceIntent(ContextImpl.java:1809)
                                                                              at android.app.ContextImpl.startServiceCommon(ContextImpl.java:1838)
                                                                              at android.app.ContextImpl.startService(ContextImpl.java:1822)
                                                                              at android.content.ContextWrapper.startService(ContextWrapper.java:516)
                                                                              at myapplication.com.canvas.MainActivity.start(MainActivity.java:24)
                                                                              at java.lang.reflect.Method.invoke(Native Method) 
                                                                              at java.lang.reflect.Method.invoke(Method.java:372) 
                                                                              at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284) 
                                                                              at android.view.View.performClick(View.java:4793) 
                                                                              at android.view.View$PerformClick.run(View.java:19960) 
                                                                              at android.os.Handler.handleCallback(Handler.java:739) 
                                                                              at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                                              at android.os.Looper.loop(Looper.java:135) 
                                                                              at android.app.ActivityThread.main(ActivityThread.java:5593) 
                                                                              at java.lang.reflect.Method.invoke(Native Method) 
                                                                              at java.lang.reflect.Method.invoke(Method.java:372) 
                                                                              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:967) 
                                                                              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762) 
                                                                  

补充代码：

<1> 配置文件：

  <service android:name=".service.FirstService" >
            <intent-filter>
                <action android:name="m4" />
            </intent-filter>
  </service>

<2>

public class FirstService extends Service {
    /*
     * intent:startServcie(it)传入的值
     * startId:启动服务的次数序号 
     * 
     */
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        
        int x = intent.getIntExtra("x", 0);
        //System.out.println("--"+startId+"--"+x);
        if (x==88) {
            //停止服务
            stopSelf();
        }
        return super.onStartCommand(intent, flags, startId);
    }
     @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        System.out.println("--onDestroy");
    }
    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

}

<3>

public class MainActivity extends AppCompatActivity {

    TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }
    public void start(View v){
        Intent it=new Intent();
        it.setAction("m4");
        it.putExtra("x", 88);
      
        startService(it);
    }
}

错误修改：

 public void start(View v){
        Intent it=new Intent();
        it.setAction("m4");
        it.putExtra("x", 88);
        it.setPackage("myapplication.com.canvas");//应用的包名
        startService(it);
    }