Question

我有一个使用webview加载网址的应用。它有一个登录功能。登录后，它将重定向到主页面。我的代码如下。

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    myWebView = (WebView) findViewById(R.id.webview);
    WebSettings webSettings = myWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setDomStorageEnabled(true);

    myWebView.setWebViewClient(new WebViewClient());
    myWebView.addJavascriptInterface(new JavaScriptInterface(this), "Android");

    if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE)
        != PackageManager.PERMISSION_GRANTED) {

        ActivityCompat.requestPermissions(this,
            new String[]{Manifest.permission.READ_PHONE_STATE},
            MY_PERMISSIONS_REQUEST_READ_PHONE_STATE);
    } else {
        loadURL();
    }
}

@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_READ_PHONE_STATE: {
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                loadURL();
            } else {
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.READ_PHONE_STATE},
                        MY_PERMISSIONS_REQUEST_READ_PHONE_STATE);
            }
            return;
        }
    }
}

private void loadURL() {
    //myWebView.loadUrl("http://192.168.0.198:8080/dashboard/");

    myWebView.loadUrl("http://192.168.0.156:8080/dashboard/");
}

以下是我的AndroidManifest.xml文件。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.tg_david.myapplication">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:configChanges="orientation|screenSize"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

正如您所看到的，我已经包含android:configChanges="orientation|screenSize"，但它仍然无效。每次手机更改方向时，WebView仍会刷新。刷新时，页面将重定向回登录页面。可能是因为当电话方向改变并强制页面退出时，WebView会清除会话吗？

Answer 1

您需要做的就是覆盖onSaveInstanceState和onRestoreInstanceState。

@Override
protected void onSaveInstanceState(Bundle outState ){
    super.onSaveInstanceState(outState);
    mWebView.saveState(outState);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState){
    super.onRestoreInstanceState(savedInstanceState);
    mWebView.restoreState(savedInstanceState);
}

另一个解决方案可能是将清单中的Activity标记更新为

android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"

1.Your question is already answered here

2.Here is one tutorial

Answer 2

根据需要添加或删除上述参数。在很多情况下，我们也有一个Splash活动，我们通常会错过这些选项，我可以通过在上面提到相同的参数并覆盖该函数来修复我的情况

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
}

在启动活动中。

让我知道是否有帮助。

Answer 3

此解决方案对我来说效果很好：

赞：

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

（2）然后在MainActivity.java中验证savedInstanceState

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mainContext = getApplicationContext();
    ----
    myWebView = (WebView) findViewById(R.id.webView);
    prepareWebView();
    myWebView.addJavascriptInterface(myJavaScriptInterface, "WEB2Android");

    if (savedInstanceState == null) {
        myWebView.post(new Runnable() {
            @Override
            public void run() {
                myWebView.loadUrl("http://www.appbiz.ro/foto_konta");
            }
        });
    }
    ----
}

（3），然后：

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
}

@Override
protected void onSaveInstanceState(Bundle outState )
{
    super.onSaveInstanceState(outState);
    myWebView.saveState(outState);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
    super.onRestoreInstanceState(savedInstanceState);
    myWebView.restoreState(savedInstanceState);
}

Android WebView刷新方向更改

3 个答案: