软键盘在颤振的 WebView 上停止工作 Android 12

Question

I have a few flutter applications in production where the webview stopped working. webview_flutter fails to show the (soft) keyboard on Android 12 (API 31), no matter of what kind of input field is clicked. The error can be easily reproduced with the Android emulator when switching between Android 11 and 12. On Android 12 it fails with a exception like this:

[        ] V/InputMethodManager(10400): b/117267690: Display ID mismatch found. ViewRootImpl displayId=1 InputMethodManager displayId=0. Use the right InputMethodManager instance to avoid performance overhead.
[        ] V/InputMethodManager(10400): java.lang.Throwable
[        ] V/InputMethodManager(10400):     at android.view.inputmethod.InputMethodManager.getFallbackInputMethodManagerIfNecessary(InputMethodManager.java:549)
[        ] V/InputMethodManager(10400):     at android.view.inputmethod.InputMethodManager.restartInput(InputMethodManager.java:1843)
[        ] V/InputMethodManager(10400):     at org.chromium.content.browser.input.ImeAdapterImpl.H(chromium-TrichromeWebViewGoogle6432.apk-stable-447211487:4)
[        ] V/InputMethodManager(10400):     at org.chromium.content.browser.input.ImeAdapterImpl.updateState(chromium-TrichromeWebViewGoogle6432.apk-stable-447211487:30)
[        ] V/InputMethodManager(10400):     at android.os.MessageQueue.nativePollOnce(Native Method)
[        ] V/InputMethodManager(10400):     at android.os.MessageQueue.next(MessageQueue.java:335)
[        ] V/InputMethodManager(10400):     at android.os.Looper.loopOnce(Looper.java:161)
[        ] V/InputMethodManager(10400):     at android.os.Looper.loop(Looper.java:288)
[        ] V/InputMethodManager(10400):     at android.app.ActivityThread.main(ActivityThread.java:7842)
[        ] V/InputMethodManager(10400):     at java.lang.reflect.Method.invoke(Native Method)
[        ] V/InputMethodManager(10400):     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
[        ] V/InputMethodManager(10400):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
[        ] V/InputMethodManager(10400): b/117267690: Display ID mismatch found. ViewRootImpl displayId=1 InputMethodManager displayId=0. Use the right InputMethodManager instance to avoid performance overhead.
[        ] V/InputMethodManager(10400): java.lang.Throwable
[        ] V/InputMethodManager(10400):     at android.view.inputmethod.InputMethodManager.getFallbackInputMethodManagerIfNecessary(InputMethodManager.java:549)
[        ] V/InputMethodManager(10400):     at android.view.inputmethod.InputMethodManager.showSoftInput(InputMethodManager.java:1625)
[        ] V/InputMethodManager(10400):     at android.view.inputmethod.InputMethodManager.showSoftInput(InputMethodManager.java:1617)
[        ] V/InputMethodManager(10400):     at sH.d(chromium-TrichromeWebViewGoogle6432.apk-stable-447211487:3)
[        ] V/InputMethodManager(10400):     at org.chromium.content.browser.input.ImeAdapterImpl.L(chromium-TrichromeWebViewGoogle6432.apk-stable-447211487:20)
[        ] V/InputMethodManager(10400):     at org.chromium.content.browser.input.ImeAdapterImpl.updateState(chromium-TrichromeWebViewGoogle6432.apk-stable-447211487:32)
[        ] V/InputMethodManager(10400):     at android.os.MessageQueue.nativePollOnce(Native Method)
[        ] V/InputMethodManager(10400):     at android.os.MessageQueue.next(MessageQueue.java:335)
[        ] V/InputMethodManager(10400):     at android.os.Looper.loopOnce(Looper.java:161)
[        ] V/InputMethodManager(10400):     at android.os.Looper.loop(Looper.java:288)
[        ] V/InputMethodManager(10400):     at android.app.ActivityThread.main(ActivityThread.java:7842)
[        ] V/InputMethodManager(10400):     at java.lang.reflect.Method.invoke(Native Method)
[        ] V/InputMethodManager(10400):     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
[        ] V/InputMethodManager(10400):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
[        ] W/InputMethodManager(10400): Ignoring showSoftInput() as view=com.pichillilorenzo.flutter_inappwebview.in_app_webview.InAppWebView{c5bb4f2 VFEDHVCL. .F...... 0,0-1080,1911} is not served.

Answer 1

webview_flutter has an option to set the platform view mode . As described in theREADME the composition mode can be switched from Virtual displays to Hybrid composition . This solves the problem, allows for full keyboard support and only requires Android SDK support 19 but comes with a drawback. The performance on Android 9 and lower is not as good as with the default virtual display mode.

To enable hybrid composition (copying webview's readme right now):

1. Set minSdkVersion in android/app/build.gradle

 android {
     defaultConfig {
         minSdkVersion 19
     }
 }

2. Put if (Platform.isAndroid) WebView.platform = SurfaceAndroidWebView(); somewhere in your application eg main.dart or in your StatefulWidget 's initState() method.