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android - 在android中将CSS注入(inject)带有webview的站点

转载 作者:IT老高 更新时间:2023-10-28 22:13:49 25 4
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例如,我想将 www.google.com 的背景颜色更改为 red。我使用了 webview,我的 style.css 文件位于 assest 文件夹 中。我想将此 style.css 文件注入(inject) www.google.com。我的代码有什么问题?请为我写下正确的代码。谢谢。我的 MainActitviy.java 文件:

package com.example.mysina;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebView;

public class MainActivity extends ActionBarActivity {


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView webView = new WebView(this);

setContentView(webView);

String html = "<html><head><style> src: url('file:///android_asset/style.css')</style></head></html>";

webView.loadData(html, "text/html", "utf-8");
webView.loadUrl("https://www.google.com");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

最佳答案

您不能直接注入(inject) CSS,但是您可以使用 Javascript 来操作页面 dom。

public class MainActivity extends ActionBarActivity {

WebView webView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

webView = new WebView(this);
setContentView(webView);

// Enable Javascript
webView.getSettings().setJavaScriptEnabled(true);

// Add a WebViewClient
webView.setWebViewClient(new WebViewClient() {

@Override
public void onPageFinished(WebView view, String url) {

// Inject CSS when page is done loading
injectCSS();
super.onPageFinished(view, url);
}
});

// Load a webpage
webView.loadUrl("https://www.google.com");
}

// Inject CSS method: read style.css from assets folder
// Append stylesheet to document head
private void injectCSS() {
try {
InputStream inputStream = getAssets().open("style.css");
byte[] buffer = new byte[inputStream.available()];
inputStream.read(buffer);
inputStream.close();
String encoded = Base64.encodeToString(buffer, Base64.NO_WRAP);
webView.loadUrl("javascript:(function() {" +
"var parent = document.getElementsByTagName('head').item(0);" +
"var style = document.createElement('style');" +
"style.type = 'text/css';" +
// Tell the browser to BASE64-decode the string into your script !!!
"style.innerHTML = window.atob('" + encoded + "');" +
"parent.appendChild(style)" +
"})()");
} catch (Exception e) {
e.printStackTrace();
}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

关于android - 在android中将CSS注入(inject)带有webview的站点,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30018540/

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