最近负责APP错误统计分析,修复线上一些BUG,有一个这样的问题,日志如下:
java.lang.NullPointerException
at android.webkit.AccessibilityInjector$TextToSpeechWrapper$1.onInit(AccessibilityInjector.java:753)
at android.speech.tts.TextToSpeech.dispatchOnInit(TextToSpeech.java:640)
at android.speech.tts.TextToSpeech.initTts(TextToSpeech.java:619)
at android.speech.tts.TextToSpeech.<init>(TextToSpeech.java:553)
at android.webkit.AccessibilityInjector$TextToSpeechWrapper.<init>(AccessibilityInjector.java:676)
at android.webkit.AccessibilityInjector.addTtsApis(AccessibilityInjector.java:480)
at android.webkit.AccessibilityInjector.addAccessibilityApisIfNecessary(AccessibilityInjector.java:168)
at android.webkit.AccessibilityInjector.onPageStarted(AccessibilityInjector.java:340)
at android.webkit.WebViewClassic.onPageStarted(WebViewClassic.java:4480)
at android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:366)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5407)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
发生该错误的机型统计截图如下:
如上图所示,都是4.2系统(API 17),那么基本可以确定是系统版本的问题
了。找了一下资料,发现该问题主要是在4.2系统中,当辅助功能打开时,加载WebView会导致空指针异常,我们可以在创建WebView时利用反射强制关闭辅助功能。
修复代码如下:
/**
* 关闭辅助功能,针对 Android 4.2 - Jelly Bean 版本
* java.lang.NullPointerException
* at android.webkit.AccessibilityInjector$TextToSpeechWrapper$1.onInit(AccessibilityInjector.java:753)
* ... ...
*/
private void disableAccessibility(Context context) {
if (Build.VERSION.SDK_INT == 17/*4.2 (Build.VERSION_CODES.JELLY_BEAN_MR1)*/) {
if (context != null) {
try {
AccessibilityManager am = (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
if (!am.isEnabled()) {
//Not need to disable accessibility
return;
}
Method setState = am.getClass().getDeclaredMethod("setState", int.class);
setState.setAccessible(true);
setState.invoke(am, 0);/**{@link AccessibilityManager#STATE_FLAG_ACCESSIBILITY_ENABLED}*/
} catch (Exception ignored) {
} catch(Error ignored){
}
}
}
}