即使没有使用服务,也会出现泄漏窗口异常

Question

我有一个非常奇怪的问题.

我一直在我的logcat中遇到这个崩溃,但奇怪的是我的应用与这个Text To Speech东西无关.不只是这个活动,我的整个应用程序根本不使用它.

08-04 03:47:19.321: E/ActivityThread(24755): Activity com.lablabla.similarsearch.WebViewActivity has leaked ServiceConnection android.speech.tts.TextToSpeech$Connection@443065c0 that was originally bound here
08-04 03:47:19.321: E/ActivityThread(24755): android.app.ServiceConnectionLeaked: Activity com.lablabla.similarsearch.WebViewActivity has leaked ServiceConnection android.speech.tts.TextToSpeech$Connection@443065c0 that was originally bound here
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:974)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:868)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.ContextImpl.bindServiceAsUser(ContextImpl.java:1452)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.ContextImpl.bindService(ContextImpl.java:1440)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.content.ContextWrapper.bindService(ContextWrapper.java:496)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.speech.tts.TextToSpeech.connectToEngine(TextToSpeech.java:685)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.speech.tts.TextToSpeech.initTts(TextToSpeech.java:655)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.speech.tts.TextToSpeech.<init>(TextToSpeech.java:608)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.webkit.AccessibilityInjector$TextToSpeechWrapper.<init>(AccessibilityInjector.java:682)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.webkit.AccessibilityInjector.addTtsApis(AccessibilityInjector.java:483)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.webkit.AccessibilityInjector.addAccessibilityApisIfNecessary(AccessibilityInjector.java:168)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.webkit.AccessibilityInjector.updateJavaScriptEnabled(AccessibilityInjector.java:418)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.webkit.WebViewClassic.updateJavaScriptEnabled(WebViewClassic.java:1682)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.webkit.WebSettingsClassic.setJavaScriptEnabled(WebSettingsClassic.java:1125)
08-04 03:47:19.321: E/ActivityThread(24755):    at com.lablabla.similarsearch.WebViewActivity.onCreate(WebViewActivity.java:24)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.Activity.performCreate(Activity.java:5133)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.os.Handler.dispatchMessage(Handler.java:99)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.os.Looper.loop(Looper.java:137)
08-04 03:47:19.321: E/ActivityThread(24755):    at android.app.ActivityThread.main(ActivityThread.java:5103)
08-04 03:47:19.321: E/ActivityThread(24755):    at java.lang.reflect.Method.invokeNative(Native Method)
08-04 03:47:19.321: E/ActivityThread(24755):    at java.lang.reflect.Method.invoke(Method.java:525)
08-04 03:47:19.321: E/ActivityThread(24755):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
08-04 03:47:19.321: E/ActivityThread(24755):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-04 03:47:19.321: E/ActivityThread(24755):    at dalvik.system.NativeStart.main(Native Method)

这里是该活动的代码:(它所做的就是从中获取一个url Intent并将其加载到a WebView)

public class WebViewActivity extends Activity {

    public static final String EXTRA_URL = "extra_url";

    private WebView webView;
    private String baseUrl;

    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.webview);
        webView = (WebView) findViewById(R.id.webView);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebViewClient(new WebViewClient());
        webView.getSettings().setUserAgentString(
            "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/20 Safari/537.31");
        baseUrl = getIntent().getStringExtra(EXTRA_URL);
        webView.loadUrl(baseUrl);
    }
}

Answer 1

我一直在我的logcat中遇到这个崩溃,但奇怪的是我的应用程序与Text To Speech无关.不只是这个活动,我的整个应用程序根本不使用它.

你的应用程序确实与它无关.

除了你打电话时:

webView.getSettings().setJavaScriptEnabled(true);

执行WebViewClassic.updateJavaScriptEnabled(boolean)方法:

void updateJavaScriptEnabled(boolean enabled) {
    if (isAccessibilityInjectionEnabled()) {

 ==>>>> // Call placed to AccessibilityInjector.updateJavaScriptEnabled(boolean)
        getAccessibilityInjector().updateJavaScriptEnabled(enabled);
    }
}

在这里,isAccessibilityInjectionEnabled()返回true设备的情况.它检索当前启用的辅助功能服务列表,并提供/支持AccessibilityServiceInfo.FEEDBACK_SPOKEN.如果此列表非空,true则返回.

向上移动堆栈跟踪:

android.webkit.AccessibilityInjector.addTtsApis()

最终创建一个TextToSpeech对象.

问题:TextToSpeech.connectToEngine()使用Context调用bindService().上下文是您的Activity的上下文(从WebView传递).我相信Logcat在WebViewActivity启动时会显示这个(或类似的东西):

成功绑定到com.google.android.tts

假设:当您的活动在屏幕旋转时被销毁并重新创建时,TTS服务仍然在上下文无效时被绑定.这就是例外所指的内容.

我尝试了以下测试我的假设:

我没有在xml中定义WebView,而是在onCreate()中动态创建它:

webView = new WebView(getApplicationContext());

请注意,我使用Application的上下文代替Activity(this).上下文在方向更改时保持有效,因此不会抛出异常.

要确认已启用一个(或多个)辅助功能服务,请将此代码添加到活动的onCreate():

AccessibilityManager am = (AccessibilityManager)
                                   getSystemService(ACCESSIBILITY_SERVICE);

List<AccessibilityServiceInfo> listOfServices = 
                                 am.getEnabledAccessibilityServiceList(
                                   AccessibilityServiceInfo.FEEDBACK_ALL_MASK);

for (AccessibilityServiceInfo asi : listOfServices) {
    Log.i("", "Accessibility Service >>>>>>>>: " + asi.getSettingsActivityName());
Log.i("", "Accessibility Service >>>>>>>>: " +
                                 asi.loadDescription(getPackageManager()));

}

注意:我必须打开TalkBack(在"设置">"辅助功能"下)才能复制该问题.此外,我不确定为什么强制停止应用程序后不会抛出此异常.

基于用户Robert Nekic的评论:背面的行为:当使用活动的上下文时抛出异常.应用程序的上下文仍然有效.

有用信息:链接.