一、问题描述
(1)问题描述:加载Flutter的页面,当页面关闭时候,App崩溃。
(2)影响版本大概:Flutter Sdk (V1.17.5 - V1.20.1)。
(3)问题原因:disconnectSurfaceFromRenderer在页面关闭释放时候被调用两次,第二次调用时候renderSurface已经为空,造成空指针。
// FlutterRenderer must be non-null.
private void disconnectSurfaceFromRenderer() {
if (flutterRenderer == null) {
throw new IllegalStateException(
"disconnectSurfaceFromRenderer() should only be called when flutterRenderer is non-null.");
}
flutterRenderer.stopRenderingToSurface();
renderSurface.release();
renderSurface = null;
}
(4) github Issues链接 https://github.com/flutter/flutter/issues/50950
二、崩溃日志
Process: com.xiaoban.mobile, PID: 8897
java.lang.RuntimeException: Unable to destroy activity {com.xiaoban.mobile/com.xiaoban.mobile.v4.ui.ActivityFlutter}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.Surface.release()' on a null object reference
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4109)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4127)
at android.app.ActivityThread.access$1500(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1475)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5835)
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:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.Surface.release()' on a null object reference
at io.flutter.embedding.android.FlutterTextureView.disconnectSurfaceFromRenderer(FlutterTextureView.java:224)
at io.flutter.embedding.android.FlutterTextureView.detachFromRenderer(FlutterTextureView.java:166)
at io.flutter.embedding.android.FlutterView.detachFromFlutterEngine(FlutterView.java:945)
at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onDestroyView(FlutterActivityAndFragmentDelegate.java:456)
at io.flutter.embedding.android.FlutterActivity.onDestroy(FlutterActivity.java:577)
at com.xiaoban.mobile.v4.ui.ActivityFlutter.onDestroy(ActivityFlutter.java:172)
at android.app.Activity.performDestroy(Activity.java:6451)
at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1154)
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4096)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4127)
at android.app.ActivityThread.access$1500(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1475)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5835)
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:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
三、解决办法
(1)可以等到Flutter Sdk V1.20.1之后再升级
(2)临时解决办法,捕获异常,不让其他崩溃。
@Override
protected void onDestroy() {
try {
super.onDestroy();
} catch (Exception e) {
// known issue of the flutter engine
// https://github.com/flutter/flutter/issues/58767
// remove when these changes are in stable engine
// https://github.com/flutter/engine/pull/19501
}
}