Android Webview的“后退"按钮转到上一页 [英] Android Webview make back button go to previous page

问题描述

我有一个网络视图，可让我浏览网站.当我单击后退"按钮时，它会退出该应用程序，而不是转到上一页.我已经将以下方法添加到MainActivity.java

I have a web view that lets me browse through a site. When i click the back button, rather than it going to the previous page it exits the app. I have added the following method to MainActivity.java

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    setContentView(R.layout.activity_main);
    WebView webview = (WebView) this.findViewById(R.id.webView);
    if (event.getAction() == KeyEvent.ACTION_DOWN) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_BACK:
                if (webview.canGoBack()) {
                    webview.goBack();
                } else {
                    finish();
                }
                return true;
        }
    }
    return super.onKeyDown(keyCode, event);
}

推荐答案

我认为您应该覆盖您的活动 OnBackPressed :

I think you should override your activity OnBackPressed :

@Override
public void onBackPressed() {
    if (webView.canGoBack()) {
        webView.goBack();
    } else {
        super.onBackPressed();
    }
}

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