WebPageActivity.java

package com.sun.bingo.ui.activity;

import android.graphics.Bitmap;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;

import com.sun.bingo.R;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunfusheng on 16/5/5.
 */
public class WebPageActivity extends BaseActivity {

    @BindView(R.id.toolbar)
    Toolbar toolbar;
    @BindView(R.id.webView)
    WebView webView;
    @BindView(R.id.progressBar)
    ProgressBar progressBar;

    private WebSettings settings;
    private String title = "";
    private String url = "";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_web_page);
        ButterKnife.bind(this);

        initData();
        initView();
    }

    private void initData() {
        title = getIntent().getStringExtra("title");
        url = getIntent().getStringExtra("url");
    }

    private void initView() {
        initToolBar(toolbar, true, title);

        settings = webView.getSettings();
        settings.setJavaScriptEnabled(true); //如果访问的页面中有Javascript，则WebView必须设置支持Javascript
        settings.setJavaScriptCanOpenWindowsAutomatically(true);
        settings.setSupportZoom(true); //支持缩放
        settings.setBuiltInZoomControls(true); //支持手势缩放
        settings.setDisplayZoomControls(false); //是否显示缩放按钮

        // >= 19(SDK4.4)启动硬件加速，否则启动软件加速
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
            settings.setLoadsImagesAutomatically(true); //支持自动加载图片
        } else {
            webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
            settings.setLoadsImagesAutomatically(false);
        }

        settings.setUseWideViewPort(true); //将图片调整到适合WebView的大小
        settings.setLoadWithOverviewMode(true); //自适应屏幕
        settings.setDomStorageEnabled(true);
        settings.setSaveFormData(true);
        settings.setSupportMultipleWindows(true);
        settings.setAppCacheEnabled(true);
        settings.setCacheMode(WebSettings.LOAD_DEFAULT); //优先使用缓存

        webView.setHorizontalScrollbarOverlay(true);
        webView.setHorizontalScrollBarEnabled(false);
        webView.setOverScrollMode(View.OVER_SCROLL_NEVER); // 取消WebView中滚动或拖动到顶部、底部时的阴影
        webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY); // 取消滚动条白边效果
        webView.requestFocus();

        webView.loadUrl(url);
        webView.setWebViewClient(new WebViewClient() {

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
                progressBar.setVisibility(View.VISIBLE);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                webView.setLayerType(View.LAYER_TYPE_NONE, null);
                progressBar.setVisibility(View.GONE);
                if (!settings.getLoadsImagesAutomatically()) {
                    settings.setLoadsImagesAutomatically(true);
                }
            }

            @Override
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                super.onReceivedError(view, errorCode, description, failingUrl);
                progressBar.setVisibility(View.GONE);
            }
        });

        webView.setWebChromeClient(new WebChromeClient() {

            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                if (newProgress >= 100) {
                    progressBar.setVisibility(View.GONE);
                } else {
                    if (progressBar.getVisibility() == View.GONE) {
                        progressBar.setVisibility(View.VISIBLE);
                    }
                    progressBar.setProgress(newProgress);
                }
                super.onProgressChanged(view, newProgress);

            }
        });
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()) {
            webView.goBack();//返回上一页面
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

}