Android之webView入门

WebView可以使得网页轻松的内嵌到app里，还可以直接跟js相互调用。

webview有两个方法：setWebChromeClient 和 setWebClient

setWebClient：主要处理解析，渲染网页等浏览器做的事情

setWebChromeClient：辅助WebView处理Javascript的对话框，网站图标，网站title，加载进度等

WebViewClient就是帮助WebView处理各种通知、请求事件的。

在AndroidManifest.xml设置访问网络权限：

“`

控件：
```
<WebView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/webView"
/>

用途一：加载本地/Web资源

实例

public class MainActivity extends Activity {

private EditText et_address=null;
private WebView webview=null;
private ProgressDialog pd=null;
@Override
protected void onCreate(Bundle savedInstanceState) {

requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

et_address=(EditText) findViewById(R.id.ed_address);
webview=(WebView) findViewById(R.id.webview);
pd=new ProgressDialog(this);
pd.setMessage("正在加载");

WebSettings setting=webview.getSettings();
setting.setSupportZoom(true);
setting.setBuiltInZoomControls(true);
webview.setWebViewClient(new WebViewClient()
{

@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
pd.show();
}

@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
pd.dismiss();
}

}
);

}

public void click(View view)
{
String address=et_address.getText().toString().trim();

if(TextUtils.isEmpty(address))
{
address="http://192.168.247.1:8080";
}

webview.loadUrl(address);
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub

if(keyCode==KeyEvent.KEYCODE_BACK&&webview.canGoBack())
{
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub

menu.addSubMenu(0, 0, 0, "刷新");
menu.addSubMenu(0, 0, 1, "后退");
menu.addSubMenu(0, 0, 2, "前进");

return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub

switch (item.getOrder()) {
case 0:
webview.reload();
break;
case 1:
if(webview.canGoBack())
{
webview.goBack();
}else
{
Toast.makeText(getApplicationContext(), "已经到第一页了", 0).show();
}
break;
case 2:
if(webview.canGoForward())
{
webview.goForward();
}else
{
Toast.makeText(getApplicationContext(), "已经是最后一页了", 0).show();
}
break;

default:
break;
}
return super.onOptionsItemSelected(item);
}
}

参考链接：webView的使用以及总结

http://www.360doc.com/content/14/0611/13/15210553_385676271.shtml