解决了吗？

 Process: net.webjoy.jackluo.android_weixi_ui_tab, PID: 2737

    java.lang.RuntimeException: Unable to start activity ComponentInfo{net.webjoy.jackluo.android_weixi_ui_tab/net.webjoy.jackluo.android_weixi_ui_tab.MainActivity}: android.util.AndroidRuntimeException: requestFeature() must be called before adding content

            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417)

            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2477)

            at android.app.ActivityThread.-wrap11(ActivityThread.java)

            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1345)

            at android.os.Handler.dispatchMessage(Handler.java:102)

            at android.os.Looper.loop(Looper.java:148)

            at android.app.ActivityThread.main(ActivityThread.java:5415)

            at java.lang.reflect.Method.invoke(Native Method)

            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:725)

            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:615)

     Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content

            at com.android.internal.policy.PhoneWindow.requestFeature(PhoneWindow.java:315)

            at android.app.Activity.requestWindowFeature(Activity.java:3598)

            at net.webjoy.jackluo.android_weixi_ui_tab.MainActivity.onCreate(MainActivity.java:40)

            at android.app.Activity.performCreate(Activity.java:6162)

            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)

            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2370)

            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2477)

            at android.app.ActivityThread.-wrap11(ActivityThread.java)

            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1345)

            at android.os.Handler.dispatchMessage(Handler.java:102)

            at android.os.Looper.loop(Looper.java:148)

            at android.app.ActivityThread.main(ActivityThread.java:5415)

            at java.lang.reflect.Method.invoke(Native Method)

            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:725)

            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:615)

10-12 05:13:18.190    2737-2744/net.webjoy.jackluo.android_weixi_ui_tab W/art﹕ Suspending all threads took: 95.953ms

最好是把代码和报错的地方截出来，这样问题比较直观

不一定是requestWindowFeature那报的错，有些方法也是需要在setContentView之前调用，你看看报错的是第几行代码