webview添加子视图

package com.afcat.channel.webviewtest;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.ViewGroup;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        WebView webView = (WebView)findViewById(R.id.webview);

        TextView header = new TextView(this);

        ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(-1, 300);

        header.setText("1234566");

        header.setBackgroundColor(Color.RED);


        webView.setWebViewClient(new WebViewClient(){
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
                return super.shouldOverrideUrlLoading(view, request);
            }
        });


        // webView.addView(header, 0, params);
        webView.addView(header, params);
        webView.loadUrl("http://sdywcd.iteye.com/blog/2035458");
    }
}