android之webview使用-处理404等错误
16lz
2021-01-23
public class WebView_404 extends Activity { private final String HOMEPAGE = "http://www.abchina.com";//请求的网站的主页 private WebView web; private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { if(msg.what==404) {//主页不存在 //载入本地assets文件夹下面的错误提示页面404.html web.loadUrl("file:///android_asset/404.html"); } else { web.loadUrl(HOMEPAGE); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); web = (WebView) findViewById(R.id.webview); web.getSettings().setJavaScriptEnabled(true); web.setWebViewClient(new WebViewClient() { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { if(url.startsWith("http://") && getRespStatus(url)==404) { view.stopLoading(); //载入本地assets文件夹下面的错误提示页面404.html view.loadUrl("file:///android_asset/404.html"); } else { view.loadUrl(url); } return true; } }); new Thread(new Runnable() { @Override public void run() { Message msg = new Message(); //此处判断主页是否存在，因为主页是通过loadUrl加载的， //此时不会执行shouldOverrideUrlLoading进行页面是否存在的判断 //进入主页后，点主页里面的链接，链接到其他页面就一定会执行shouldOverrideUrlLoading方法了 if(getRespStatus(HOMEPAGE)==404) { msg.what = 404; } handler.sendMessage(msg); } }).start(); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode==KeyEvent.KEYCODE_BACK && web.canGoBack()) { web.goBack(); return false; } return super.onKeyDown(keyCode, event); } private int getRespStatus(String url) { int status = -1; try { HttpHead head = new HttpHead(url); HttpClient client = new DefaultHttpClient(); HttpResponse resp = client.execute(head); status = resp.getStatusLine().getStatusCode(); } catch (IOException e) {} return status; } } 更多相关文章
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