作为项目的一部分，客户希望为Android TV创建一个自定义主屏幕应用程序，取代默认启动器。我们能做到这一点。现在我们的客户想要从应用程序中启动leanback启动器，就像任何其他应用程序一样。我尝试了以下内容，
Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.google.android.leanbacklauncher");
startActivity(launchIntent);
但出现以下错误：
09-09 23:08:29.785: E/InputEventSender(2474): Exception dispatching finished signal.
09-09 23:08:29.786: E/MessageQueue-JNI(2474): Exception in MessageQueue callback: handleReceiveCallback
09-09 23:08:29.787: E/MessageQueue-JNI(2474): java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.content.Intent.migrateExtraStreamToClipData()' on a null object reference
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1494)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.app.Activity.startActivityForResult(Activity.java:3745)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.app.Activity.startActivityForResult(Activity.java:3706)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.app.Activity.startActivity(Activity.java:4016)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.app.Activity.startActivity(Activity.java:3984)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at me.xxxxx.xxxxx.homescreen.MainActivity$1.onClick(MainActivity.java:21)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.View.performClick(View.java:4780)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.View.onKeyUp(View.java:9023)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.widget.TextView.onKeyUp(TextView.java:5953)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.KeyEvent.dispatch(KeyEvent.java:2643)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.View.dispatchKeyEvent(View.java:8411)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1495)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1495)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1495)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1495)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:2361)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1709)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.app.Activity.dispatchKeyEvent(Activity.java:2702)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2276)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:4020)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3982)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3713)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:3874)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2208)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1849)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1840)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2185)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.os.MessageQueue.nativePollOnce(Native Method)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.os.MessageQueue.next(MessageQueue.java:143)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.os.Looper.loop(Looper.java:122)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at android.app.ActivityThread.main(ActivityThread.java:5257)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at java.lang.reflect.Method.invoke(Native Method)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at java.lang.reflect.Method.invoke(Method.java:372)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
09-09 23:08:29.787: E/MessageQueue-JNI(2474): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
09-09 23:08:29.787: D/AndroidRuntime(2474): Shutting down VM
09-09 23:08:29.788: E/AndroidRuntime(2474): FATAL EXCEPTION: main
09-09 23:08:29.788: E/AndroidRuntime(2474): Process: me.xxxxx.xxxxx.homescreen, PID: 2474
09-09 23:08:29.788: E/AndroidRuntime(2474): java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.content.Intent.migrateExtraStreamToClipData()' on a null object reference
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1494)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.app.Activity.startActivityForResult(Activity.java:3745)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.app.Activity.startActivityForResult(Activity.java:3706)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.app.Activity.startActivity(Activity.java:4016)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.app.Activity.startActivity(Activity.java:3984)
09-09 23:08:29.788: E/AndroidRuntime(2474): at me.xxxxx.xxxxx.homescreen.MainActivity$1.onClick(MainActivity.java:21)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.View.performClick(View.java:4780)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.View.onKeyUp(View.java:9023)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.widget.TextView.onKeyUp(TextView.java:5953)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.KeyEvent.dispatch(KeyEvent.java:2643)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.View.dispatchKeyEvent(View.java:8411)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1495)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1495)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1495)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1495)
09-09 23:08:29.788: E/AndroidRuntime(2474): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:2361)
09-09 23:08:29.788: E/AndroidRuntime(2474): at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1709)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.app.Activity.dispatchKeyEvent(Activity.java:2702)
09-09 23:08:29.788: E/AndroidRuntime(2474): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2276)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:4020)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3982)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3713)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:3874)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2208)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1849)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1840)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2185)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.os.MessageQueue.nativePollOnce(Native Method)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.os.MessageQueue.next(MessageQueue.java:143)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.os.Looper.loop(Looper.java:122)
09-09 23:08:29.788: E/AndroidRuntime(2474): at android.app.ActivityThread.main(ActivityThread.java:5257)
09-09 23:08:29.788: E/AndroidRuntime(2474): at java.lang.reflect.Method.invoke(Native Method)
09-09 23:08:29.788: E/AndroidRuntime(2474): at java.lang.reflect.Method.invoke(Method.java:372)
09-09 23:08:29.788: E/AndroidRuntime(2474): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
09-09 23:08:29.788: E/AndroidRuntime(2474): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
请帮忙。