我正在使用 XWalkView 将移动网站显示为应用程序。我的问题是当应用程序进入后台并返回时它会重新加载它显示的页面。当它来自后台时，我想保持它的状态并从该状态继续。这是我的代码:

public class MainActivity extends AppCompatActivity {

    static final String URL = "https://www.biletdukkani.com.tr";
    static final int MY_PERMISSIONS_REQUEST_ACCESS_LOCATION = 55;
    static final String SHOULD_ASK_FOR_LOCATION_PERMISSION = "shouldAskForLocationPermission";
    static final String TAG = "MainActivity";
    static final String COMMAND = "/system/bin/ping -c 1 185.22.184.184";
    static XWalkView xWalkWebView;
    TextView noInternet;
    static Bundle stateBundle;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "onCreate");

        // Check whether we're recreating a previously destroyed instance
        if (savedInstanceState != null) {
            // Restore value of members from saved state
            stateBundle = savedInstanceState.getBundle("xwalk");
        }

        setContentView(R.layout.activity_main);
        initNoInternetTextView();
    }


    public void onRestoreInstanceState(Bundle savedInstanceState) {
        // Always call the superclass so it can restore the view hierarchy
        super.onRestoreInstanceState(savedInstanceState);
        stateBundle = savedInstanceState.getBundle("xwalk");
        Log.d(TAG, "onRestoreInstanceState");
    }


    /**
     * İnternet yok mesajı gösteren TextVidew'i ayarlar.
     */
    private void initNoInternetTextView() {
        Log.d(TAG, "initNoInternetTextView");
        noInternet = (TextView) findViewById(R.id.no_internet);
        if (noInternet != null) {
            noInternet.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    checkInternetConnection();
                }
            });
        }
    }


    /**
     * WebView'i ayarlar.
     */
    private void initWebView() {
        Log.d(TAG, "initWebView");
        if (xWalkWebView == null) {
            ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar);
            xWalkWebView = (XWalkView) findViewById(R.id.webView);
            //xWalkWebView.clearCache(true);
            xWalkWebView.load(URL, null);
            xWalkWebView.setResourceClient(new BDResourceClient(xWalkWebView, progressBar));
        }
    }


    @Override
    protected void onResume() {
        super.onResume();
        Log.d(TAG, "onResume");
        checkLocationPermissions();
        checkInternetConnection();

        if (xWalkWebView != null && stateBundle != null) {
            xWalkWebView.restoreState(stateBundle);
        }
    }


    @Override
    protected void onPause() {
        super.onPause();
        Log.d(TAG, "onPause");
        if (xWalkWebView != null) {
            stateBundle = new Bundle();
            xWalkWebView.saveState(stateBundle);
        }
    }


    public void onSaveInstanceState(Bundle savedInstanceState) {
        Log.d(TAG, "onSaveInstanceState");
        // Save the user's current game state
        savedInstanceState.putBundle("xwalk", stateBundle);
        // Always call the superclass so it can save the view hierarchy state
        super.onSaveInstanceState(savedInstanceState);
    }


    @Override
    public void onBackPressed() {
        Log.d(TAG, "onBackPressed");
        if (xWalkWebView != null && xWalkWebView.getNavigationHistory().canGoBack()) {
            xWalkWebView.getNavigationHistory().navigate(XWalkNavigationHistory.Direction.BACKWARD, 1);
        } else {
            super.onBackPressed();
        }
    }
}

我也曾尝试添加以下行以显示但没有成功。

android:launchMode="singleTask"
android:alwaysRetainTaskState="true"

我该怎么做？ 提前致谢。

最佳答案

一种方法是在设置为保留其实例的 fragment 内初始化 View 。

关于Android:保存 XWalkView - 人行横道状态，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39556577/