java - CordovaWebView 搞砸了 android 中的 onBackPressed 方法

Question

正如标题所说，CordovaWebView 和 onBackPressed 在 android 中的组合给出了奇怪的结果。我有混合应用程序。我的主要 Activity 有 DrawerLayout 和 CordovaWebView。我的 onBackPressed:

 @Override

public void onBackPressed(){
  if(drawerIsOpen){
    //close drawer
  }else if(webviewIsIn){
     //hide webview
  }else{
     super.onBackPressed();
  }
}

当我使用 android 的 WebView 时，覆盖的方法按预期被调用。当我更改为 CordovaWebView 时，甚至不会调用该方法，而是调用 native onBackPressed 。我已经尝试覆盖 onKeyDown 和 onKeyUp 但它给了我相同的结果，只是没有调用这些方法。我正在使用 Cordova 2.9.0，测试设备是 Galaxy Note 2、Android jellybean 4.2.2DrawerLayout 具有关闭后退功能，我刚刚将其禁用。我希望你们能理解这个问题。

Answer 1

我遇到了同样的问题。我的解决方案是从 CordovaWebView 派生并覆盖 public boolean onKeyUp(int keyCode, KeyEvent event) 类似这样的东西(对于 Cordova 3.4.0，代码是CordovaWebView.onKeyUp(int, KeyEvent):

public class CustomCordovaWebView extends CordovaWebView {

    protected View mCustomView;

    protected boolean bound;

    public CustomCordovaWebView(final Context context) {
        super(context);
    }

    public CustomCordovaWebView(final Context context, final AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomCordovaWebView(final Context context, final AttributeSet attrs, final int defStyle) {
        super(context, attrs, defStyle);
    }

    @TargetApi(11)
    public CustomCordovaWebView(final Context context, final AttributeSet attrs, final int defStyle, final boolean privateBrowsing) {
        super(context, attrs, defStyle, privateBrowsing);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        // If back key
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            // A custom view is currently displayed  (e.g. playing a video)
            if (mCustomView!=null){
                this.hideCustomView();
            }else{
                // The webview is currently displayed
                // If back key is bound, then send event to JavaScript
                if (this.bound) {
                    this.loadUrl("javascript:cordova.fireDocumentEvent('backbutton');");
                    return true;
                } else {
                    // If not bound
                    // Go to previous page in webview if it is possible to go back
                    if (this.backHistory()) {
                        return true;
                    }
                    // If not, then invoke default behavior
                    else {
                        //this.activityState = ACTIVITY_EXITING;
                        //return false;
                        // If they hit back button when app is initializing, app should exit instead of hang until initialization (CB2-458)
                        // this.cordova.getActivity().finish();
                        // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this thing is closing your activity in CordovaWebView
                    }
                }
            }
        } else {
            return super.onKeyUp(keyCode, event);
        }

        return false;
    }

    @Override
    public void hideCustomView() {
        mCustomView = null;
        super.hideCustomView();
    }

    @Override
    public void showCustomView(final View view, final WebChromeClient.CustomViewCallback callback) {
        mCustomView = view;
        super.showCustomView(view, callback);
    }

    @Override
    public void bindButton(final boolean override) {
        bound = override;
        super.bindButton(override);
    }
}

如果有更好的解决方案，我会感兴趣的。