Android WebView 实现缓存网页数据

public class MainActivity extends Activity {

    private WebView webView;
    private String url = "https://wap.baidu.com/";

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

    public void initView() {
        webView = (WebView) findViewById(R.id.activity_webview);
        webView.requestFocus();
        webView.setHorizontalScrollBarEnabled(false);
        webView.setVerticalScrollBarEnabled(false);
        initWebView();

    }

    @SuppressWarnings("deprecation")
    @SuppressLint("SetJavaScriptEnabled")
    private void initWebView() {

        webView.getSettings().setJavaScriptEnabled(true);
        // 设置 缓存模式
        if (NetUtils.isNetworkAvailable(MainActivity.this)) {
            webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
        } else {
            webView.getSettings().setCacheMode(
                    WebSettings.LOAD_CACHE_ELSE_NETWORK);
        }
        // webView.getSettings().setBlockNetworkImage(true);// 把图片加载放在最后来加载渲染
        webView.getSettings().setRenderPriority(RenderPriority.HIGH);
        // 支持多窗口
        webView.getSettings().setSupportMultipleWindows(true);
        // 开启 DOM storage API 功能
        webView.getSettings().setDomStorageEnabled(true);
        // 开启 Application Caches 功能
        webView.getSettings().setAppCacheEnabled(true);
        onLoad();
    }

    @SuppressWarnings("deprecation")
    @SuppressLint("SetJavaScriptEnabled")
    public void onLoad() {

        try {
            webView.setWebViewClient(new WebViewClient() {

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

                    Log.i("tag", "onLoadResource url=" + url); // 开始加载
                    super.onLoadResource(view, url);
                }

                @Override
                public boolean shouldOverrideUrlLoading(WebView webview,
                        String url) {

                    Log.i("tag", "intercept url=" + url);
                    // 重写此方法表明点击网页里面的链接还是在当前的webview里跳转，不跳到浏览器那边
                    webview.loadUrl(url);

                    return true;
                }

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

                    String title = view.getTitle(); // 得到网页标题

                    Log.e("tag", "onPageFinished WebView title=" + title);

                }

                @Override
                public void onReceivedError(WebView view, int errorCode,
                        String description, String failingUrl) {

                    Toast.makeText(getApplicationContext(), "加载错误",
                            Toast.LENGTH_LONG).show();
                }
            });
            webView.loadUrl(url);
        } catch (Exception e) {
            return;
        }
    }

    @Override
    // 设置回退
    // 覆盖Activity类的onKeyDown(int keyCoder,KeyEvent event)方法
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
            webView.goBack(); // goBack()表示返回WebView的上一页面
            return true;
        } else {
            finish();
        }
    }

    /***
     * 防止WebView加载内存泄漏
     */
    @Override
    protected void onDestroy() {
        super.onDestroy();
        webView.removeAllViews();
        webView.destroy();
    }

}

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>