一、崩溃日志：

java.lang.NullPointerException: Attempt to invoke interface method 'void io.flutter.embedding.engine.renderer.RenderSurface.attachToRenderer(io.flutter.embedding.engine.renderer.FlutterRenderer)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2757)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2818)
        at android.app.ActivityThread.-wrap12(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1557)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:163)
        at android.app.ActivityThread.main(ActivityThread.java:6393)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
     Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void io.flutter.embedding.engine.renderer.RenderSurface.attachToRenderer(io.flutter.embedding.engine.renderer.FlutterRenderer)' on a null object reference
        at io.flutter.embedding.android.FlutterView.attachToFlutterEngine(FlutterView.java:699)
        at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onCreateView(FlutterActivityAndFragmentDelegate.java:290)
        at io.flutter.embedding.android.FlutterActivity.createFlutterView(FlutterActivity.java:519)
        at io.flutter.embedding.android.FlutterActivity.onCreate(FlutterActivity.java:413)
        at com.xiaoban.mobile.v4.ui.ActivityFlutter.onCreate(ActivityFlutter.java:163)
        at android.app.Activity.performCreate(Activity.java:6858)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2710)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2818) 
        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1557) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:163) 
        at android.app.ActivityThread.main(ActivityThread.java:6393) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823) 
2020-08-07 10:20:00.671 13989-13989/com.xiaoban.mobile I/Process: Sending signal. PID: 13989 SIG: 9

二、崩溃原因 SDK  (Channel stable, v1.17.5)

错误赋值flutterSurfaceView 给renderSurface；造成的。

private FlutterView(
@nonnull Context context,
@nullable AttributeSet attrs,
@nonnull FlutterTextureView flutterTextureView) {
super(context, attrs);

this.flutterTextureView = flutterTextureView;
this.renderSurface = flutterSurfaceView;

init();

}

三、解决办法，升级下一个稳定版本Sdk

flutter channel stable
flutter upgrade
flutter doctor