我遇到了一个非常奇怪的问题。
我的logcat中不断出现这种崩溃,但奇怪的是,我的应用程序与Text To Speech
无关。不仅仅是这个活动,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)
下面是该活动的代码:(它所做的只是从Intent
获取一个url并将其加载到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);
}
}
我的logcat一直在崩溃,但奇怪的是该应用程序和"文本到语音"无关。不仅仅是这个活动,我的整个应用程序根本不使用它。
你的应用程序实际上与它无关。
除了当你打电话时:
webView.getSettings().setJavaScriptEnabled(true);
执行WebViewClassic.updateJavaScriptEnabled(布尔值)方法:
void updateJavaScriptEnabled(boolean enabled) {
if (isAccessibilityInjectionEnabled()) {
==>>>> // Call placed to AccessibilityInjector.updateJavaScriptEnabled(boolean)
getAccessibilityInjector().updateJavaScriptEnabled(enabled);
}
}
在这里,isAccessibilityInjectionEnabled()
在您设备的情况下返回true
。它检索当前启用的辅助功能服务的列表,并提供/支持AccessibilityServiceInfo.FEEDBACK_SPOKEN
。如果此列表不为空,则返回true
。
向上移动堆栈:
android.webkit.AccessibilityInjector.addTtsApis()
最终创建一个CCD_ 8对象。
问题是:TextToSpeech.connectToEngine()
使用Context调用bindService()。上下文是"活动"的上下文(从WebView传递)。我相信Logcat在WebViewActivity
启动时显示了这一点(或类似的情况):
成功绑定到com.google.android.tts
假设:当你的"活动"在屏幕旋转中被破坏和重新创建时,TTS服务仍然被绑定,而上下文不再有效。这就是异常所指的。
我尝试了以下方法来检验我的假设:
我没有在xml中定义WebView,而是在onCreate():中动态创建了它
webView = new WebView(getApplicationContext());
请注意,我使用了Application的上下文来代替Activity的(this)。上下文在方向更改时保持有效,因此不会引发异常。
要确认启用了一个(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)才能复制此问题。此外,我不确定为什么在强制停止应用程序后没有引发此异常。
基于用户Robert Nekic的评论:反压行为:使用活动的上下文时引发异常。应用程序的上下文仍然有效。
有用信息:链接。
您可以添加此代码片段以避免此服务连接泄漏异常:
class YourActivity extends Activity {
WebView yourWebView;
@Override
public void onDestroy() {
if (yourWebView != null) {
yourWebView.getSettings().setJavaScriptEnabled(false);
}
}
yourWebView.getSettings().setJavaScriptEnabled(false);将触发对AccessibilityInjector.updateJavaScriptEnabled()的调用其中:
private void removeTtsApis() {
if (mTextToSpeech != null) {
mTextToSpeech.stop();
mTextToSpeech.shutdown();
mTextToSpeech = null;
}
mWebView.removeJavascriptInterface(ALIAS_TTS_JS_INTERFACE);
}
shutdown()只是其中的关键点。