Android WebView的使用

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

布局文件代码：

<LinearLayout 

    android:layout_width="match_parent"

    android:layout_height="match_parent">

        <WebView

            android:id="@+id/web"

            android:layout_width="match_parent"

            android:layout_height="match_parent"/>

</LinearLayout>

Activity代码

1、加载url

        String path ="https://www.baidu.com/";

        mWebView.loadUrl(path);

2、设置支持JavaScript

        WebSettings settings =mWebView.getSettings();

        settings.setJavaScriptEnabled(true);

3、判断WebView是否能返回上一页

重写方法onKeyDown

        @Override

        public boolean onKeyDown(int keyCode, KeyEvent event) {

                if (keyCode == KeyEvent.KEYCODE_BACK &&mWebView.canGoBack()){

                mWebView.goBack();

                return true;

                }

            return super.onKeyDown(keyCode, event);

        }

或者重写方法

        @Override

        public void onBackPressed() {

                if(mWebView.canGoBack()){

                mWebView.goBack();

                return;

                }

        super.onBackPressed();

        }

4、设置加载进度条

布局中添加

        <ProgressBar

        android:id="@+id/progress"

        android:layout_width="match_parent"

        android:layout_height="10dp"

        android:max="100"

        android:progress="0"

        style="@style/Widget.AppCompat.ProgressBar.Horizontal"/>

        mWebView.setWebChromeClient(new WebChromeClient(){

                @Override

                public void onProgressChanged(WebView view,int newProgress) {

                        mProgressBar.setProgress(newProgress);

                        super.onProgressChanged(view, newProgress);

                    }

        });

        mWebView.setWebViewClient(new WebViewClient(){

            @Override

            public void onPageStarted(WebView view, String url, Bitmap favicon) {

                mProgressBar.setVisibility(View.VISIBLE);

                super.onPageStarted(view, url, favicon);

        }

            @Override

            public void onPageFinished(WebView view, String url) {

                mProgressBar.setVisibility(View.GONE);

                super.onPageFinished(view, url);

            }

    });

5、获取title

        mWebView.setWebChromeClient(new WebChromeClient(){

            @Override

            public void onReceivedTitle(WebView view, String title) {

                setTitle(title);

                super.onReceivedTitle(view, title);

            }

        });