Android程序利用WebView 加载网页
2016-05-17 08:19
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public class MainActivity extends Activity {
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.myWeb1);
// 设置可以支持缩放
webView.getSettings().setSupportZoom(true);
// 设置出现缩放工具
webView.getSettings().setBuiltInZoomControls(true);
//扩大比例的缩放
webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setLayoutAlgorithm(LayoutAlgorithm.NARROW_COLUMNS);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setJavaScriptEnabled(true);
webView.addJavascriptInterface(new InJavaScriptLocalObj(), "local_obj");
webView.setWebViewClient(new MyWebViewClient());
webView.loadUrl("http://www.hao123.com");
Button btn=(Button) findViewById(R.id.btn);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this,MainActivity.class));
}
});
}
/**
* 点击回退返回上一个访问的页面
*/
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack(); // goBack()表示返回WebView的上一页面
return true;
}
return super.onKeyDown(keyCode, event);
}
final class MyWebViewClient extends WebViewClient {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
public void onPageStarted(WebView view, String url, Bitmap favicon) {
Log.d("WebView", "onPageStarted");
super.onPageStarted(view, url, favicon);
}
public void onPageFinished(WebView view, String url) {
Log.d("WebView", "onPageFinished ");
view.loadUrl("javascript:window.local_obj.showSource('<head>'+"
+ "document.getElementsByTagName('html')[0].innerHTML+'</head>');");
super.onPageFinished(view, url);
}
}
final class InJavaScriptLocalObj {
public void showSource(String html) {
Log.d("HTML", html);
}
}
}
需要添加权限<uses-permission android:name="android.permission.INTERNET"/> ,不添加不会报错,但是会显示网页不可用,注意:android:targetSdkVersion="16" API不能17.
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.myWeb1);
// 设置可以支持缩放
webView.getSettings().setSupportZoom(true);
// 设置出现缩放工具
webView.getSettings().setBuiltInZoomControls(true);
//扩大比例的缩放
webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setLayoutAlgorithm(LayoutAlgorithm.NARROW_COLUMNS);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setJavaScriptEnabled(true);
webView.addJavascriptInterface(new InJavaScriptLocalObj(), "local_obj");
webView.setWebViewClient(new MyWebViewClient());
webView.loadUrl("http://www.hao123.com");
Button btn=(Button) findViewById(R.id.btn);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this,MainActivity.class));
}
});
}
/**
* 点击回退返回上一个访问的页面
*/
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack(); // goBack()表示返回WebView的上一页面
return true;
}
return super.onKeyDown(keyCode, event);
}
final class MyWebViewClient extends WebViewClient {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
public void onPageStarted(WebView view, String url, Bitmap favicon) {
Log.d("WebView", "onPageStarted");
super.onPageStarted(view, url, favicon);
}
public void onPageFinished(WebView view, String url) {
Log.d("WebView", "onPageFinished ");
view.loadUrl("javascript:window.local_obj.showSource('<head>'+"
+ "document.getElementsByTagName('html')[0].innerHTML+'</head>');");
super.onPageFinished(view, url);
}
}
final class InJavaScriptLocalObj {
public void showSource(String html) {
Log.d("HTML", html);
}
}
}
需要添加权限<uses-permission android:name="android.permission.INTERNET"/> ,不添加不会报错,但是会显示网页不可用,注意:android:targetSdkVersion="16" API不能17.
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