github地址（完整Demo下载，欢迎访问）
https://github.com/zhouxu88/ErroWebViewDemo
在Android项目中，我们通常会用WebView来加载网页面，当我们的手机没有联网，或是服务端不小心瘫痪的时候，WebView展示的效果就比较丑。
Paste_Image.png
解决办法
我们自定义一个View用来展示加载失败的样子，或者我们也可以直接写一个错误展示的HTML让WebView加载等等。我们进行重写的方法是WebViewClient的onReceivedError（）方法。
效果图
自定义加载网页错误的view.jpg
MainActivity：
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private WebView webView;
private FrameLayout loadingLayout; //提示用户正在加载数据
private RelativeLayout webParentView;
private View mErrorView; //加载错误的视图
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.webView);
loadingLayout = (FrameLayout) findViewById(R.id.loading_layout);
initErrorPage();//初始化自定义页面
initWebView();
}
private void initWebView() {
//加载需要显示的网页
webView.loadUrl("http://www.baidu.com/");
WebSettings mWebSettings = webView.getSettings();
mWebSettings.setJavaScriptEnabled(true); //允许加载javascript
mWebSettings.setSupportZoom(true); //允许缩放
mWebSettings.setBuiltInZoomControls(true); //原网页基础上缩放
mWebSettings.setUseWideViewPort(true); //任意比例缩放
webView.setWebViewClient(new WebViewClient() {
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
super.onReceivedError(view, errorCode, description, failingUrl);
//6.0以下执行
Log.i(TAG, "onReceivedError: ------->errorCode" + errorCode + ":" + description);
//网络未连接
showErrorPage();
}
//处理网页加载失败时
@Override
public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
super.onReceivedError(view, request, error);
//6.0以上执行
Log.i(TAG, "onReceivedError: ");
showErrorPage();//显示错误页面
}
});
webView.setWebChromeClient(new WebChromeClient() {
@Override
public void onProgressChanged(WebView view, int newProgress) {
Log.i(TAG, "onProgressChanged:----------->" + newProgress);
if (newProgress == 100) {
loadingLayout.setVisibility(View.GONE);
}
}
@Override
public void onReceivedTitle(WebView view, String title) {
super.onReceivedTitle(view, title);
Log.i(TAG, "onReceivedTitle:title ------>" + title);
if (title.contains("404")){
showErrorPage();
}
}
});
webParentView = (RelativeLayout) webView.getParent(); //获取父容器
}
/**
* 显示自定义错误提示页面，用一个View覆盖在WebView
*/
private void showErrorPage() {
webParentView.removeAllViews(); //移除加载网页错误时，默认的提示信息
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
webParentView.addView(mErrorView, 0, layoutParams); //添加自定义的错误提示的View
}
/***
* 显示加载失败时自定义的网页
*/
private void initErrorPage() {
if (mErrorView == null) {
mErrorView = View.inflate(this, R.layout.layout_load_error, null);
}
}
}
- activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.zx.errowebviewdemo.MainActivity">
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!--加载提示的loading图-->
<include
android:layout_width="wrap_content"
android:layout_height="wrap_content"
layout="@layout/loading_anim"
android:layout_centerInParent="true"/>
</RelativeLayout>
- layout_load_error.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/load_error_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--加载网页错误的提示图-->
<ImageView
android:id="@+id/error_iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:contentDescription="@null"
android:src="@mipmap/no_data" />
<!--点击提示文字，重新加载网页-->
<TextView
android:id="@+id/reload_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/error_iv"
android:layout_centerHorizontal="true"
android:layout_marginTop="8dp"
android:gravity="center"
android:text="数据获取失败\n, 请检查网络后再重试 ~~~" />
</RelativeLayout>
- layout/loading_anim.xml
<?xml version="1.0" encoding="utf-8"?><!--加载提示图-->
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/loading_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@null"
android:scaleType="centerCrop"
android:src="@drawable/beijing" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:contentDescription="@null"
android:scaleType="centerCrop"
android:src="@drawable/loading_anim" />
<!--loading提示图-->
<TextView
android:id="@+id/loading_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:layout_marginBottom="3dp"
android:gravity="center"
android:text="@string/please_wait"
android:textColor="#ffffff" />
</FrameLayout>
