我正在尝试通过 webview 显示一些网页而不连接到互联网。如果没有连接到互联网,我会收到空指针错误。如果有连接,它正在工作。所以我认为这与
webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ONLY);
webView.loadUrl("http://www.google.de");
请帮我。我已经用 getCacheDir() 检查了 AppCachePath 是否正确;非常感谢
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setDomStorageEnabled(true);
webView.getSettings().setAppCacheMaxSize(1024*1024*8);
webView.getSettings().setAppCachePath("/data/data/de.app/cache");
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setAppCacheEnabled(true);
webView.setWebChromeClient(new WebChromeClient() {
@Override
public void onReachedMaxAppCacheSize(long spaceNeeded, long totalUsedQuota,
WebStorage.QuotaUpdater quotaUpdater)
{
quotaUpdater.updateQuota(spaceNeeded * 2);
}
});
ConnectivityManager cm =
(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
if(cm.getActiveNetworkInfo().isConnected()== true)
{
webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
webView.loadUrl("http://www.google.de");
}
else{
webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ONLY);
webView.loadUrl("http://www.google.de");
}
11-05 12:46:20.213: WARN/dalvikvm(15681): threadid=3: thread exiting with uncaught exception (group=0x4001b180)
11-05 12:46:20.213: ERROR/AndroidRuntime(15681): Uncaught handler: thread main exiting due to uncaught exception
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.webstest/de.webstest.webbrowser}: java.lang.NullPointerException
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at android.os.Handler.dispatchMessage(Handler.java:99)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at android.os.Looper.loop(Looper.java:123)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at android.app.ActivityThread.main(ActivityThread.java:4363)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at java.lang.reflect.Method.invokeNative(Native Method)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at java.lang.reflect.Method.invoke(Method.java:521)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:862)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at dalvik.system.NativeStart.main(Native Method)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): Caused by: java.lang.NullPointerException
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at de.webstest.webbrowser.onCreate(webbrowser.java:87)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
11-05 12:46:20.323: ERROR/AndroidRuntime(15681): ... 11 more