場景
??在Ability中，我們點擊按鈕進入到一個WebView中，在WebView中點擊新的鏈接進入到另一個新的界面，這時按下回傳鍵發現WebView并未回傳到上一個瀏覽的界面，而是直接退出了WebView，
解決
??重寫一下Ability的onKeyDown方法，對回傳進行監聽：
public boolean onKeyDown(int keyCode, KeyEvent keyEvent) {
Navigator navigator = webView.getNavigator();
if(keyCode == keyEvent.KEY_BACK && navigator.canGoBack()) {
navigator.goBack();
return true;
}
return super.onKeyDown(keyCode, keyEvent);
}
??通過getNavigator方法獲取Navigator物件，如果用戶當前按下了回傳鍵并且WebView設定了能夠回傳，則呼叫navigator的goBack()方法進行回傳，
布局檔案
<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
xmlns:ohos="http://schemas.huawei.com/res/ohos"
ohos:height="match_parent"
ohos:width="match_parent"
ohos:alignment="center"
ohos:orientation="vertical">
<ohos.agp.components.webengine.WebView
ohos:id="$+id:web_view"
ohos:height="match_parent"
ohos:width="match_parent">
</ohos.agp.components.webengine.WebView>
</DirectionalLayout>
Ability處理邏輯
package com.example.ncepu.Student.User;
import com.example.ncepu.ResourceTable;
import com.example.ncepu.Student.User.slice.CSDNAbilitySlice;
import ohos.aafwk.ability.Ability;
import ohos.aafwk.content.Intent;
import ohos.agp.components.webengine.Navigator;
import ohos.agp.components.webengine.ResourceRequest;
import ohos.agp.components.webengine.WebAgent;
import ohos.agp.components.webengine.WebView;
import ohos.multimodalinput.event.KeyEvent;
import ohos.utils.net.Uri;
public class CSDNAbility extends Ability {
private WebView webView;
@Override
public void onStart(Intent intent) {
super.onStart(intent);
super.setMainRoute(CSDNAbilitySlice.class.getName());
super.setUIContent(ResourceTable.Layout_ability_csdn);
initViews();
}
private void initViews() {
webView = (WebView) findComponentById(ResourceTable.Id_web_view);
webView.getWebConfig().setJavaScriptPermit(true); // 如果網頁需要使用JavaScript，增加此行；如何使用JavaScript下文有詳細介紹
webView.setWebAgent(new MyWebAgent());
final String url = "https://blog.csdn.net/Cyril_KI"; // EXAMPLE_URL由開發者自定義
webView.load(url);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent keyEvent) {
Navigator navigator = webView.getNavigator();
if(keyCode == keyEvent.KEY_BACK && navigator.canGoBack()) {
navigator.goBack();
return true;
}
return super.onKeyDown(keyCode, keyEvent);
}
class MyWebAgent extends WebAgent {
public static final String EXAMPLE_URL = "...";
@Override
public boolean isNeedLoadUrl(WebView webview, ResourceRequest request) {
if (request == null || request.getRequestUrl() == null) {
return false;
}
Uri uri = request.getRequestUrl();
if (uri.getDecodedHost().equals(EXAMPLE_URL)) {
return false;
} else {
return super.isNeedLoadUrl(webview, request);
}
}
}
}
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標籤：其他