下面看看我怎么调出去的…
第一步,我们还是要在AndroidManifolest.xml里面添加

如果你没有判断请求权限会报以下错误
AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.jie.demo, PID: 17959
java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.CALL dat=tel:xxxxxxxxxx cmp=com.android.server.telecom/.components.UserCallActivity } from ProcessRecord{5d8891e 17959:com.example.jie.demo/u0a63} (pid=17959, uid=10063) with revoked permission android.permission.CALL_PHONE
at android.os.Parcel.readException(Parcel.java:1599)
at android.os.Parcel.readException(Parcel.java:1552)
at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:2658)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1507)
at android.app.Activity.startActivityForResult(Activity.java:3917)
at android.app.Activity.startActivityForResult(Activity.java:3877)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:784)
at android.app.Activity.startActivity(Activity.java:4200)
at android.app.Activity.startActivity(Activity.java:4168)
at com.example.jie.demo.ui.MainActivity.onClick(MainActivity.java:85)
at android.view.View.performClick(View.java:5198)
at android.view.View PerformClick.run(View.java:21147)atandroid.os.Handler.handleCallback(Handler.java:739)atandroid.os.Handler.dispatchMessage(Handler.java:95)atandroid.os.Looper.loop(Looper.java:148)atandroid.app.ActivityThread.main(ActivityThread.java:5417)atjava.lang.reflect.Method.invoke(NativeMet