我想提高我的 webview 的性能。
目前，我的 webview 正在加载我的应用程序不需要的几个资源，例如 *.css 或 *.jpg。
如何防止它加载带有扩展名的 url？
我正在使用 API 级别 7。
【问题讨论】：
标签： android performance webview
如果您只需要页面中的文本，您可以抓取 html 并从那里解析出来：
HttpClient httpClient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
String url = "http://www.google.com";
BufferedReader reader;
HttpGet httpGet = new HttpGet(url);
String result = "";
try {
HttpResponse response = httpClient.execute(httpGet, localContext);
reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String line = null;
result = "";
while ((line = reader.readLine()) != null){
result += line + "\n";
}
} catch(Exception e){}
// result now contains the html text
或者您甚至可以这样做并重新创建页面，减去 .jpg 和 .css 引用。
【讨论】：
如果您可以接受 API 11 的要求，您可以实现 shouldInterceptRequest 为带有这些扩展名的 URL 返回某种空的 WebResourceResponse。
【讨论】：
myWebView.setWebViewClient(new MyWebViewClient());
protected class MyWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
String ext = MimeTypeMap.getFileExtensionFromUrl(url);
if (ext.eq.....
【讨论】：
防止android webview加载某些url
你必须检查加载的url是否相等，如果不加载webviw
MainActivity.Java
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private static final String TAG = "WebActivity";
private Context mContext;
WebView webview;
Toolbar toolbar;
ImageView mBackResource;
Boolean progress = true;
private boolean isRedirected = true;
String urlintent;
public static ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_webview);
mContext = MainActivity.this;
urlintent = "https://www.google.co.in";
WebView wv = (WebView) findViewById(R.id.webView);
mBackResource = (ImageView) findViewById(R.id.backarrowwufoo);
mBackResource.setOnClickListener(this);
toolbar = (Toolbar) findViewById(R.id.toolbar);
wv.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
wv.loadUrl(urlintent);
wv.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
Log.e(TAG, "url check" + url + "intent" + urlintent);
if (url.equals(urlintent)) {
Log.e(TAG, "url check" + url + "intent" + urlintent);
//Load your page if it equals
view.loadUrl(url);
return false; // let me handle this!
} else {
//Do not load your page if it is not equals
return true; // no need to use loadUrl!
}
}
@SuppressWarnings("deprecation")
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
// Handle the error
if (errorCode == -2 || errorCode == -8) {
view.loadUrl("file:///android_asset/error.html");
}
if (errorCode == -14) {
view.loadData("Page cannot be found on server", "text/html", "UTF-8");
}
}
@TargetApi(android.os.Build.VERSION_CODES.M)
@Override
public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
// Redirect to deprecated method, so you can use it in all SDK versions
onReceivedError(view, rerr.getErrorCode(), rerr.getDescription().toString(), req.getUrl().toString());
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
// Log.d("onPageStarted", "onPageStarted:" + url );
if (isRedirected) {
if (progress) {
progress = false;
showProgres(mContext);
}
isRedirected = false;
}
}
@Override
public void onLoadResource(WebView view, String url) {
super.onLoadResource(view, url);
// Log.v(TAG, "onLoadResource url: " + url);
}
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
// Log.d("onPagefinished", "onPagefinished:" + url );
if (!isRedirected) {
//Do something you want when finished loading
isRedirected = true;
if (!progress) {
hidepDialog();
progress = true;
}
}
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.backarrowwufoo:
onBackPressed();
break;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (!progress) {
hidepDialog();
progress = true;
}
}
public static void showProgres(Context context) {
pDialog = new ProgressDialog(context);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
showpDialog();
}
public static void showpDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
public static void hidepDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
}
Activity_main：
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
app:elevation="0dp"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimaryDark"
android:minHeight="?attr/actionBarSize">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingRight="10dp">
<ImageView
android:id="@+id/backarrowwufoo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_gravity="center"
android:scaleType="center"
android:padding="14dp"
android:src="@drawable/ic_arrow"
android:gravity="center" />
</RelativeLayout>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:padding="10dp"
android:layout_height="match_parent" />
</android.support.design.widget.CoordinatorLayout>
【讨论】：