Question

我＆＃39;我正在面对android webview中的两个问题。

屏幕方向更改时屏幕显示空白。和
永久存储Cookie（用户名和密码），目前仅存储一天，当我在第二天打开我的应用时，它再次询问登录凭据。

请帮帮我。谢谢

public class MainActivity extends AppCompatActivity {
private WebView webView;
ProgressBar webpageprogressbar;

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

    webView = (WebView) findViewById(R.id.webView2);
    webpageprogressbar = (ProgressBar) findViewById(R.id.progressBar);
    webpageprogressbar.setProgress(0);
    webpageprogressbar.setMax(100);
    MainActivity.this.webpageprogressbar.setProgress(0);

    if(savedInstanceState !=null)
    {
        webView.restoreState(savedInstanceState);
    }else {
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setAllowFileAccess(true);
    }
    CookieSyncManager.createInstance(MainActivity.this);
    CookieManager manager = new CookieManager();
    Log.i("My APP","At onCreate");
    manager.setCookiePolicy(CookiePolicy.ACCEPT_ALL);

    final Activity activity = this;

    webView.setOnKeyListener(new OnKeyListener() {

        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (event.getAction() == KeyEvent.ACTION_DOWN) {
                WebView web = (WebView) v;

                switch (keyCode) {
                    case KeyEvent.KEYCODE_BACK:
                        if (web.canGoBack()) {
                            web.goBack();
                            return true;
                        }
                        break;
                }
            }
            return false;
        }
    });


    webView.setWebViewClient(new WebViewClient()
    {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            Log.d("My APP","At shouldOverrideRlLoading");
            view.loadUrl(url);
            return  true;
        }

        @Override
        public void onPageFinished(WebView view, String url) {

            Log.d("My APP", "At onPageFinished");
            CookieSyncManager.getInstance().sync();
            super.onPageFinished(view, url);
        }
    });

    webView.setWebChromeClient(new WebChromeClient() {
        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            MainActivity.this.setValue(newProgress);
            if(newProgress ==100)
            {
                webpageprogressbar.setVisibility(View.GONE);
            }else {
                webpageprogressbar.setVisibility(View.VISIBLE);
            }

        }
    });
    if (savedInstanceState == null) {
        Log.d("My APP","At savedInstanceState");
        webView.loadUrl("http://google.com");
    }
    if (Build.VERSION.SDK_INT >= 19) {
        webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
    }


}

public void setValue(int progress) {
    MainActivity.this.webpageprogressbar.setProgress(progress);
}
@Override
// Detect when the back button is pressed
public void onBackPressed() {

    if(webView.canGoBack()) {

        webView.goBack();

    } else {
        // Let the system handle the back button
        super.onBackPressed();
    }
}


@Override
public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
    super.onSaveInstanceState(outState, outPersistentState);
    webView.saveState(outState);
}

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

@Override
protected void onResume() {
    Log.d("My APP","At onResume");
    CookieSyncManager.getInstance().startSync();
    super.onResume();
}

@Override
protected void onStart() {
    super.onStart();
}

@Override
protected void onPause() {
    Log.d("My APP","At onPause");
    CookieSyncManager.getInstance().stopSync();
    super.onPause();
}

@Override
protected void onStop() {
    super.onStop();
}

@Override
protected void onRestart() {
    super.onRestart();
}

@Override
protected void onDestroy() {
    super.onDestroy();
}

}

清单文件： -

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:configChanges="orientation|screenSize"
    android:theme="@style/AppTheme" >

Answer 1

将下述标记添加到声明活动的清单文件中：

android:configChanges="keyboardHidden|orientation|screenSize"

例如：<activity android:name="com.test.MainActivity" android:configChanges="keyboardHidden|orientation|screenSize" android:screenOrientation="landscape" />

存储Cookie：

// Create instance
CookieSyncManager syncManager = CookieSyncManager.createInstance(webView.getContext());
// Get instance
CookieManager cookieManager = CookieManager.getInstance();
// Set cookie
cookieManager.setCookie();
// Sync cookie
syncManager.sync();

随时可以询问任何查询。

屏幕方向问题并永久存储cookie

1 个答案: