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Android Webview加载页面

2017-06-29 21:23 323 查看

public class Webviews extends AppCompatActivity implements View.OnClickListener {
private TextView titleTxt;
private ProgressBar progressBar;
private WebView webView;
String url="http://mini.eastday.com/mobile/170621135553962.html";
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.webviews);
initView();
webView.loadUrl(url);
}
private void initView() {

titleTxt=(TextView)findViewById(R.id.title);
progressBar=(ProgressBar)findViewById(R.id.progressbar);
webView=(WebView)findViewById(R.id.webview);
webView.setWebChromeClient(new WebChromeClient(){
@Override
public void onProgressChanged(WebView view, int newProgress) {

super.onProgressChanged(view, newProgress);
progressBar.setProgress(newProgress);
}

@Override
public void onReceivedTitle(WebView view, String title) {
super.onReceivedTitle(view, title);
titleTxt.setText("Webview");

}
});

webView.setWebViewClient(new WebViewClient(){
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
//true  自己处理  false浏览器出处理 默认false
return true;
}

@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
progressBar.setVisibility(View.VISIBLE);
}

@Override
public void onPageFinished(WebView view, String url) {

super.onPageFinished(view,url);
progressBar.setVisibility(View.GONE);
}

});

}

@Override
public void onClick(View v) {

switch (v.getId()) {
case R.id.left:
goback();
break;
case R.id.right:
webView.reload();
webView.goForward();
break;

default:
break;
}
}

private void goback() {

if(webView.canGoBack()){
webView.goBack();
}else{
webView.clearView();
finish();
}
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if(keyCode==KeyEvent.KEYCODE_BACK){
if(webView.canGoBack()){
webView.goBack();
return true;
}
}
return super.onKeyDown(keyCode, event);
}

}
------------------------------------------
activity布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClick"
android:layout_alignParentLeft="true"
android:text="后退"/>
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="主题"/>
<Button
android:id="@+id/right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:onClick="onClick"
android:text="前进"/>
</RelativeLayout>

<ProgressBar
android:id="@+id/progressbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="100"
style="?android:attr/progressBarStyleHorizontal"/>

<WebView
android:id="@+id/webview"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

</LinearLayout>

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