Android WebView的使用方法总结

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:my="http://schemas.android.com/apk/res-auto"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="@color/activity_main_bg"  android:orientation="vertical">  <com.eloancn.borrower.common.widget.TitleView    android:id="@+id/titleView"    android:layout_width="match_parent"    android:layout_height="50dp"    my:titleText="H5" />  <RelativeLayout    android:id="@+id/rl_webViewContainer"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <!--在代码中添加webView防止内存泄露隐患-->    <LinearLayout      android:id="@+id/neterror_tip"      android:layout_width="match_parent"      android:layout_height="match_parent"      android:gravity="center_horizontal"      android:visibility="gone">      <ImageView        android:layout_marginTop="110dp"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/not_found" />    </LinearLayout>  </RelativeLayout></LinearLayout>

public class CommonWebViewActivity extends Activity {   private WebView mWebView;   private TitleView mTitleView;   private RelativeLayout mWebViewContainer;   private String title;   private String url;   private LinearLayout neterrorLayout;   private int mFlag;  //来源    public static final int FLAG_SIGNATURE = 1;    @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_common_webview_main);     initData();     initView();     setData();   }    @Override   protected void onDestroy() {     super.onDestroy();     mWebView.setWebViewClient(null);     mWebView.setWebChromeClient(null);     mWebViewContainer.removeView(mWebView);     mWebView.removeAllViews();     mWebView.destroy();   }    private void initData() {     url = getIntent().getStringExtra("url");     title = getIntent().getStringExtra("title");     mFlag = getIntent().getIntExtra("flag", 0);   }    private void initView() {     mTitleView = (TitleView) findViewById(R.id.titleView);     mWebViewContainer = (RelativeLayout) findViewById(R.id.rl_webViewContainer);     neterrorLayout = (LinearLayout) findViewById(R.id.neterror_tip);     mWebView = new WebView(getApplicationContext());     LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(         LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);     mWebViewContainer.addView(mWebView, layoutParams);      WebSettings webSettings = mWebView.getSettings();     //设置WebView属性，能够执行Javascript脚本     webSettings.setJavaScriptEnabled(true);     //设置可以访问文件     webSettings.setAllowFileAccess(true);     //设置支持缩放     webSettings.setBuiltInZoomControls(false);     //允许js弹出窗口     webSettings.setJavaScriptCanOpenWindowsAutomatically(true);      mTitleView.setLeftBtnClickListener(new TitleView.OnBtnClickListener() {       @Override       public void onClick(View v) {         if (mWebView.canGoBack()) {           mWebView.goBack();         } else {           finish();         }       }     });   }    @Override   public boolean onKeyDown(int keyCode, KeyEvent event) {     if (keyCode == KeyEvent.KEYCODE_BACK) {       if (mWebView.canGoBack()) {         mWebView.goBack();         return true;       }     }     return super.onKeyDown(keyCode, event);   }    private void setData() {     mTitleView.setTitle(title);     mWebView.loadUrl(url);      mWebView.setWebChromeClient(new WebChromeClient(){       @Override       public boolean onJsAlert(WebView view, String url, final String message, final JsResult result) {         //注意，WebView默认不会显示JavaScript的Alert，需要Android实现。         runOnUiThread(new Runnable() {           @Override           public void run() {             //自定义美观的Dialog，仅仅是为了显示message             CustomDialog.Builder builder = new CustomDialog.Builder(CommonWebViewActivity.this);             builder.setTitle("提示");             builder.setMessage(message);             builder.setSingle("知道了", new DialogInterface.OnClickListener() {               @Override               public void onClick(DialogInterface dialogInterface, int i) {                 dialogInterface.dismiss();               }             });             builder.create().show();           }         });         result.confirm();//这里必须调用，否则页面会阻塞造成假死         return true;       }        @Override       public void onReceivedTitle(final WebView view, final String title) {         super.onReceivedTitle(view, title);         if (FLAG_SIGNATURE == mFlag) {           runOnUiThread(new Runnable() {             @Override             public void run() {               mTitleView.setTitle(title);             }           });         }       }     });     mWebView.setWebViewClient(new WebViewClient() {       @Override       public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {         if (FLAG_SIGNATURE == mFlag) {           Log.d("brycegao", "shouldInterceptRequest url:" + request.getUrl().toString());           if (request.getUrl().toString().contains("wxd://getImage?tenderid=")) {             //可以通过url传值给Android， 即在url里放置想要的参数             runOnUiThread(new Runnable() {               @Override               public void run() {                 setResult(RESULT_OK);                 finish();               }             });           }          }         return super.shouldInterceptRequest(view, request);       }        @Override       public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {         mWebView.loadUrl(url);         return true;       }        @Override       public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {         super.onReceivedError(view, request, error);          if (FLAG_SIGNATURE == mFlag             && request.getUrl().toString().contains("wxd://getImage?tenderid=")) {           //do nothing           mWebView.setVisibility(View.GONE); //优化体验，避免显示错误信息         } else {           //加载失败           neterrorLayout.setVisibility(View.VISIBLE);           mWebView.setVisibility(View.GONE);         }       }     });      neterrorLayout.setOnClickListener(new View.OnClickListener() {       @Override       public void onClick(View view) {         mWebView.setVisibility(View.VISIBLE);         neterrorLayout.setVisibility(View.GONE);         mWebView.loadUrl(url);       }     });   } }