Android 安卓WebView套殼H5網頁 手機傳回鍵問題(過濾二級頁面,傳回鍵相應給WebView)

1.首先 重寫 onKeyDown方法  添加如下代碼:

/**
 * 按鍵響應，在WebView中檢視網頁時，檢查是否有可以前進的曆史記錄。
 */
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    // Check if the key event was the Back button and if there's history
 
    if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {

        // 傳回鍵退回
        webView.goBack();
        return true;
    }
    // If it wasn't the Back key or there's no web page history, bubble up
    // to the default
    // system behavior (probably exit the activity)
    return super.onKeyDown(keyCode, event);
}      

2.代碼寫到這裡會出現一個問題,多次點選底部導航按鈕 再點選傳回鍵 會相應WebView的GoBack,導緻在首頁 底部導航反向跳而不退出應用 

解決辦法,

   a.  聲明成員變量 :

private boolean isMainAvtivity = true;      

b.onKeyDown方法中 改寫成如下 意思是如果      

isMainAvtivity是true的話 出走退出應用的代碼 如果是false的話 相應webview的GoBack事件      

/**      

* 按鍵響應，在WebView中檢視網頁時，檢查是否有可以前進的曆史記錄。
 */
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    // Check if the key event was the Back button and if there's history
    if (isMainAvtivity) {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {
            if ((System.currentTimeMillis() - exitTime) > 2000) {
                Toast.makeText(getApplicationContext(), "再按一次退出程式", Toast.LENGTH_SHORT).show();

                exitTime = System.currentTimeMillis();
            } else {
                finish();
            }
            return true;
        }
        return true;
    }
    if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {

        // 傳回鍵退回
        webView.goBack();
        return true;
    }
    // If it wasn't the Back key or there's no web page history, bubble up
    // to the default
    // system behavior (probably exit the activity)
    return super.onKeyDown(keyCode, event);
}      

3.      

isMainAvtivity 的值 是通過過濾網頁進行true或者false的指派
代碼如下:      

// 覆寫WebView預設使用第三方或系統預設浏覽器打開網頁的行為，使網頁用WebView打開
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                if (!TextUtils.isEmpty(url)) {
                    videoFlag = url.contains("vedio");
                }
                if (url.trim().startsWith("tel")) {//特殊情況tel，調用系統的撥号軟體撥号【<a href="tel:[phone]" target="_blank" rel="external nofollow" >1111111111</a>】
                    Intent i = new Intent(Intent.ACTION_VIEW);
                    i.setData(Uri.parse(url));
                    startActivity(i);
                } else {
                    String port = url.substring(url.lastIndexOf(":") + 1, url.lastIndexOf("/"));//嘗試要攔截的視訊通訊url格式(808端口)：【http://xxxx:808/?roomName】
                    if (port.equals("808")) {//特殊情況【若打開的連結是視訊通訊位址格式則調用系統浏覽器打開】
                        Intent i = new Intent(Intent.ACTION_VIEW);
                        i.setData(Uri.parse(url));
                        startActivity(i);
                    } else {//其它非特殊情況全部放行
                        view.loadUrl(url);
                    }
                }
                return true;

            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                Log.e("========", "66666 ");
                //重新onPageStarted方法 如果加載的是一級頁面 isMainActivity==true,
                if ("http://..../index.php?a=/home/user/shouye.html".equals(url)) {
                    isMainAvtivity = true;
                }
                if ("http://...../index.php?a=/home/shop/index.html".equals(url)) {
                    isMainAvtivity = true;
                }
                if ("http://...../index.php?a=/home/user/zhuanpan.html".equals(url)) {
                    isMainAvtivity = true;
                }
                if ("http://...../index.php?a=/home/user/index.html".equals(url)) {
                    isMainAvtivity = true;
                }

                //如果是從一級頁面跳轉到二級的頁面 通通給于false,可以用contains進行判斷
                if (url != null) {
                    if (url.contains("http://...../index.php?a=/home/shop/xiangqing/id/")) {
                        isMainAvtivity = false;
                    }
                }
                if (url != null) {
                    if (url.contains("http://...../index.php?a=/home/shop/jiesuan/id/")) {
                        isMainAvtivity = false;
                    }
                }


                if ("http://...../index.php?a=/home/user/shengji.html".equals(url)) {
                    isMainAvtivity = false;
                }
                if ("http://...../index.php?a=/home/user/updatemembermsg.html".equals(url)) {
                    isMainAvtivity = false;
                }
                if ("http://...../index.php?a=/home/user/zjgl.html".equals(url)) {
                    isMainAvtivity = false;
                }
                if ("http://...../index.php?a=/home/user/dingdan.html".equals(url)) {
                    isMainAvtivity = false;
                }
                if ("http://...../index.php?a=/home/user/userlist.html".equals(url)) {
                    isMainAvtivity = false;
                }
                if ("http://...../index.php?a=/home/index/index.html".equals(url)) {
                    isMainAvtivity = false;
                }


                if ("http://...../index.php?a=/home/user/cz_record.html".equals(url)) {
                    isMainAvtivity = false;
                }

                if ("http://...../index.php?a=/home/user/chongzhi.html".equals(url)) {
                    isMainAvtivity = false;
                }

                if ("http://...../index.php?a=/home/user/tixian.html".equals(url)) {
                    isMainAvtivity = false;
                }

                if ("http://...../index.php?a=/home/user/tixian_record.html".equals(url)) {
                    isMainAvtivity = false;
                }
                if ("http://...../index.php?a=/home/bonus/financialflow.html".equals(url)) {
                    isMainAvtivity = false;
                }

                if ("http://...../index.php?a=/home/user/gonggao/param/1.html".equals(url)) {
                    isMainAvtivity = false;
                }

                if ("http://...../index.php?a=/home/user/gonggao/param/2.html".equals(url)) {
                    isMainAvtivity = false;
                }
                if ("http://...../index.php?a=/home/user/chongzhi".equals(url)) {
                    isMainAvtivity = false;
                }
            }


            @Override
            public void onPageFinished(WebView view, String url) {
                //頁面加載完畢,結束對話框

            }

            @Override
            public void onLoadResource(WebView view, String url) {
                //加載頁面資源,比如每加載一張圖檔就會調用
            }


            @Override
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                //頁面加載錯誤回掉
                switch (errorCode) {
                    case 404:
//                        view.loadUrl("file:///android_assets/error_handle.html");
                        break;
                }
            }


        });
      

3.至此 大功告成