Question

我在android studio工作。我在主要活动中使用了webview。当我运行我的项目时，它会给出一个错误，例如......“无法加载http://www.google.com的网页，因为：net :: ERR_CACHE_MISS”。请看我的代码：在清单中：

SELECT col1
      ,CASE WHEN CAST(start_dt AS DATE) = b.cal_dt THEN start_dt
            WHEN CAST(end_dt AS DATE) = b.cal_dt THEN CAST(CAST(end_dt AS DATE)AS DATETIME)
            ELSE CAST(cal_dt AS DATETIME)
       END AS start_dt
       ,CASE WHEN CAST(start_dt AS DATE) = b.cal_dt THEN CAST(DATEADD(day,1,CAST(start_dt AS DATE))AS DATETIME)
            WHEN CAST(end_dt AS DATE) = b.cal_dt THEN end_dt
            ELSE CAST(DATEADD(day,1,cal_dt) AS DATETIME)
        END AS end_dt
FROM Table1 a
JOIN lkp_Calendar b
  ON b.cal_dt BETWEEN CAST(start_dt AS DATE) AND CAST(end_Dt AS DATE)

活动：

<application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".defaultActivity"
            android:label="@string/app_name"
          >
            <uses-permission android:name="android.permission.INTERNET"/>
            <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
            <uses-permission android:name="android.permission.android.permission.ACCESS_NETWORK_STATE"/>
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

在布局中：

WebView _taskOrganizerView = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_default);
        _taskOrganizerView =   (WebView)findViewById(R.id.wvTskOrg);
        _taskOrganizerView.getSettings().setJavaScriptEnabled(true);
        if (Build.VERSION.SDK_INT >= 19) {
            _taskOrganizerView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
        }
        _taskOrganizerView.loadUrl("http://www.google.com");
        _taskOrganizerView.setWebViewClient(new WebViewClient() );
    }

Answer 1

我今天面临同样的问题，最后我发现我忘了在AndroidManifest.xml文件中添加权限公告。我添加

后就好了

<uses-permission android:name="android.permission.INTERNET"/>

AndroidManifest.xml中的

Answer 2

您可能是此错误的受害者：

Issue 424599: Failed to load resource: net::ERR_CACHE_MISS error when opening DevTools on PHP pages

对于具有Cache-Control响应标头

的网页，似乎会发生这种情况

Answer 3

您的代码：

if (Build.VERSION.SDK_INT >= 19) {
            _taskOrganizerView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
        }

如果您从未加载＆＃34; http://www.google.com＆＃34;，则setCacheMode LOAD_CACHE_ELSE_NETWORK会出错，您可以：

webview.setWebViewClient(new WebViewClient() {

            @Override
            public void onReceivedError(WebView view, int errorCode,
                    String description, String failingUrl) {
                super.onReceivedError(view, errorCode, description, failingUrl);
                //setWebView Gone
            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);

            }

            @Override
            public void onPageFinished(WebView view, final String url) {
                super.onPageFinished(view, url);


            }

Answer 4

在android清单文件中的应用程序标记之外使用Internet权限。

Answer 5

在上面的代码中，您似乎正在尝试在<application>标签中设置权限。

正如处于this answer状态的@zehata一样，应在清单文件的<application>标记之外授予权限。首先将其放在正确的位置，因为该位置似乎也很重要。尝试这样的事情：

    <manifest package="your.awesome.package"
          xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:tools="http://schemas.android.com/tools">

        <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
        <uses-permission android:name="android.permission.android.permission.ACCESS_NETWORK_STATE"/>

        <application
            android:allowBackup="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:theme="@style/AppTheme" >
            <activity
                android:name=".defaultActivity"
                android:label="@string/app_name">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>

        <!-- more content of manifest file -->

   </manifest>

Android Webview中的loadUrl（）因net :: ERR_CACHE_MISS而失败

5 个答案: