WebView

public class MainActivity extends AppCompatActivity {

private WebView webView;

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

//获取WebView组件
webView = (WebView) findViewById(R.id.webView);
//JS语句在WebView上运行
webView.getSettings().setJavaScriptEnabled(true);
//WebView加载的网络来源
webView.loadUrl("http://www.baidu.com");

//处理Url
webView.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view , String url){
view.loadUrl(url);
return true;
}
});
}

//返回键+能否返回
public boolean onKeyDown(int keyCode , KeyEvent event){

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