万能的webView之Activity
对于使用webview加载一个网页，使用它的loadurl()方法即可，如果在程序内要打开网页，难么就要自己创建一个WebViewClient,通过setWebViewClient进行关联，再如果网页里面有javaScript那就要设置了
//启用支持javascriptWebSettings settings =webView.getSettings();
settings.setJavaScriptEnabled(true);
这都是一系列问题，但有没有想过直接写一个activity，只需传入url就可以显示网页，包括解决缓存的使用：
webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
后退时的操作：
//改写物理按键——返回的逻辑@OverridepublicbooleanonKeyDown(intkeyCode, KeyEvent event) {//TODO Auto-generated method stubif(keyCode==KeyEvent.KEYCODE_BACK)
{
if(webView.canGoBack())
{
webView.goBack();//返回上一页面returntrue;
}else{
System.exit(0);//退出程序}
}returnsuper.onKeyDown(keyCode, event);
}
等等一些列问题.
在此就引入了一个相对比较万能的webview,传入url即可，复制就能使用的webview的activity
importandroid.content.Intent;
importandroid.util.Log;
importandroid.view.View;
importandroid.webkit.WebView;
importandroid.widget.TextView;
publicclassWhyWebActivityextendsCanbackWebActivityimplementsView.OnClickListener {
privateTextView header_title;
privateString webPageTitle;
@Override
protectedintgetContentView() {
returnR.layout.activity_new_web;
}
@Override
protectedWebView getWebview() {
return(WebView) findViewById(R.id.new_web_view);
}
@Override
protectedNumberProgressBar getProgressbar() {
return(NumberProgressBar) findViewById(R.id.new_web_progress_bar);
}
@Override
protectedTextView getTextViewClose() {
return(TextView) findViewById(R.id.header_left_close);
}
@Override
protectedvoidsetTitle(String urlTitle) {
Intent intent = getIntent();
if(intent !=null) {
webPageTitle = intent.getStringExtra("title");
}
if(webPageTitle !=null&& !webPageTitle.equals("")) {
header_title.setText(webPageTitle);
}else{
header_title.setText(urlTitle);
}
}
@Override
protectedvoidonLoadError(WebView webView,interrorCode, String description, String failingUrl) {
}
@Override
protectedvoidonLoadEnd(String url) {
}
@Override
protectedvoidinitEnd() {
webview.loadUrl(getIntent().getStringExtra("url"));// 网址
findViewById(R.id.header_left_btn).setOnClickListener(this);// 返回按钮点击事件
header_title = (TextView) findViewById(R.id.header_title);
}
@Override
protectedvoidjsCallJava(MWebviewClient mWebviewClient) {
}
@Override
protectedvoidonJsRequest(Object data) {
}
@Override
publicvoidonClick(View v) {
switch(v.getId()) {
// 点击关闭页面
caseR.id.header_left_btn:
onBackPressed();
break;
}
}
}
然后就是父类CanBackWebActivity
packagecn.moviebuff.app.homewall.Web;
importandroid.annotation.SuppressLint;
importandroid.app.Activity;
importandroid.content.Intent;
importandroid.graphics.Bitmap;
importandroid.graphics.Color;
importandroid.net.http.SslError;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.Gravity;
importandroid.view.KeyEvent;
importandroid.view.View;
importandroid.webkit.JavascriptInterface;
importandroid.webkit.SslErrorHandler;
importandroid.webkit.WebChromeClient;
importandroid.webkit.WebSettings;
importandroid.webkit.WebView;
importandroid.widget.TextView;
importandroid.widget.Toast;
importcom.umeng.socialize.ShareAction;
importcom.umeng.socialize.UMShareListener;
importcom.umeng.socialize.bean.SHARE_MEDIA;
importcom.umeng.socialize.media.UMImage;
importorg.json.JSONException;
importorg.json.JSONObject;
importbutterknife.ButterKnife;
publicabstractclassCanbackWebActivityextendsActivity {
protectedWebView webview;
protectedNumberProgressBar progressbar;
protectedTextView textViewClose;
protectedMWebviewClient mWebviewClient;
privateString webTitle;
@Override
publicvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initView();
if(null!= webview &&null!= progressbar &&null!= textViewClose) {
iniWebview();
initEnd();
}
}
@Override
publicIntent getIntent() {
returnsuper.getIntent();
}
privatevoidinitView() {
setContentView(getContentView());
ButterKnife.inject(this);
webview = getWebview();
progressbar = getProgressbar();
textViewClose = getTextViewClose();
toastRoot = getLayoutInflater().inflate(R.layout.activity_sign,null);
}
protectedabstractintgetContentView();
protectedabstractWebView getWebview();
protectedabstractNumberProgressBar getProgressbar();
protectedabstractTextView getTextViewClose();
protectedabstractvoidsetTitle(String urlTitle);
protectedabstractvoidonLoadError(WebView webView,interrorCode, String description, String failingUrl);
protectedabstractvoidonLoadEnd(String url);
protectedabstractvoidinitEnd();
protectedabstractvoidjsCallJava(MWebviewClient mWebviewClient);
protectedabstractvoidonJsRequest(Object data);
privatestaticfinalString APP_CACAHE_DIRNAME ="/webcache";
@SuppressLint("SetJavaScriptEnabled")
@SuppressWarnings("deprecation")
privatevoidiniWebview() {
webview.getSettings().setSupportZoom(false);
webview.getSettings().setBuiltInZoomControls(false);
try{
webview.getSettings().setJavaScriptEnabled(true);
}catch(Exception e) {
System.out.println(e);
}
webview.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
webview.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);//设置 缓存模式
// 开启 DOM storage API 功能
webview.getSettings().setDomStorageEnabled(true);
//开启 database storage API 功能
webview.getSettings().setDatabaseEnabled(true);
String cacheDirPath = getFilesDir().getAbsolutePath() + APP_CACAHE_DIRNAME;
//设置 Application Caches 缓存目录
webview.getSettings().setAppCachePath(cacheDirPath);
//开启 Application Caches 功能
webview.getSettings().setAppCacheEnabled(true);
webview.setWebChromeClient(newMChormeClient());
mWebviewClient =newMWebviewClient(webview);
webview.setWebViewClient(mWebviewClient);
progressbar.setProgressTextColor(Color.parseColor("#29b6f6"));
textViewClose.setOnClickListener(newView.OnClickListener() {
@Override
publicvoidonClick(View v) {
finish();
}
});
// 添加js交互接口类，并起别名 webtest
webview.addJavascriptInterface(this,"webtest");
webview.setWebViewClient(newMWebviewClient(webview));
}
protectedclassMWebviewClientextendsWVJBWebViewClient {
publicMWebviewClient(WebView webView) {
//交互
super(webView,newWVJBHandler() {
@Override
publicvoidrequest(Object data, WVJBResponseCallback callback) {
JSONObject outdata = (JSONObject) data;
onJsRequest(outdata);
Intent intent =newIntent();
try{
String act = outdata.getString("act");
if(act !=null) {
if(act.equals("showToast")) {
if(outdata.has("str")) {
String str = outdata.get("str").toString();
if(str !=null) {
showToast(str);
// T.showShort(CanbackWebActivity.this,str);
}
}
}elseif
}
}
}catch(JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
jsCallJava(this);
}
//加载开始
@Override
publicvoidonPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
//加载完成
@Override
publicvoidonPageFinished(WebView view, String url) {
progressbar.setVisibility(View.GONE);
onLoadEnd(url);
super.onPageFinished(view, url);
booleanisBack = webview.canGoBack();
if(isBack) {
textViewClose.setVisibility(View.VISIBLE);
}else{
textViewClose.setVisibility(View.GONE);
}
//被点击的图片地址为：http://image.moviebuff.cn/images/201609/mem_2016-09-19-10_1474253053_99140.jpg!600-max
//动态注入js
// 这段js函数的功能就是，遍历所有的img几点，并添加onclick函数，函数的功能是在图片点击的时候调用本地java接口并传递url过去
view.loadUrl("javascript:(function(){"+
"var objs = document.getElementsByTagName(\"img\"); "+
"for(var i=0;i
"{"
+" objs[i].onclick=function() "+
" { "
+" webtest.jsInvokeJava(this.src); "+
" } "+
"}"+
"})()");
}
//加载失败
@Override
publicvoidonReceivedError(WebView view,interrorCode, String description, String failingUrl) {
progressbar.setVisibility(View.GONE);
onLoadError(webView, errorCode, description, failingUrl);
}
@Override
publicvoidonReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
super.onReceivedSslError(view, handler, error);
progressbar.setVisibility(View.GONE);
}
}
@JavascriptInterface
publicvoidjsInvokeJava(String img) {
Log.i("ddddddddddsss","被点击的图片地址为："+ img);
}
protectedclassMChormeClientextendsWebChromeClient {
@Override
publicvoidonProgressChanged(WebView view,intnewProgress) {
if(newProgress ==100) {
progressbar.setVisibility(View.GONE);
}else{
if(progressbar.getVisibility() != View.VISIBLE) {
progressbar.setVisibility(View.VISIBLE);
}
progressbar.setProgress(newProgress);
}
super.onProgressChanged(view, newProgress);
}
@Override
publicvoidonReceivedTitle(WebView view, String title) {
super.onReceivedTitle(view, title);
webTitle = title;
setTitle(title);
}
}
@Override
publicvoidonBackPressed() {
if(null!= webview && webview.canGoBack()) {
webview.goBack();
}else{
webview.loadUrl("about:blank");
super.onBackPressed();
}
}
@Override
publicbooleanonKeyDown(intkeyCode, KeyEvent event) {
if(keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() ==0) {
webview.loadUrl("about:blank");
//webView.destroy();
onBackPressed();
returntrue;
}
returnsuper.onKeyDown(keyCode, event);
}
privatevoidsetShareContent(String share_text, String share_image, String share_url, String title) {
finalSHARE_MEDIA[] displaylist =newSHARE_MEDIA[]{
SHARE_MEDIA.WEIXIN, SHARE_MEDIA.WEIXIN_CIRCLE,
SHARE_MEDIA.QQ, SHARE_MEDIA.QZONE
};
UMImage localImage =newUMImage(thisActivity, R.drawable.ic_launcher);
newShareAction(this).setDisplayList(displaylist)
.withText(share_text)// 摘要
.withTitle(title)// 标题
.withTargetUrl(share_url)// 分享的网址
.withMedia(localImage)// 分享的图片
.setListenerList(newUMShareListener() {
@Override
publicvoidonResult(SHARE_MEDIA platform) {
T.showShort(thisActivity,"分享成功啦");
}
@Override
publicvoidonError(SHARE_MEDIA platform, Throwable t) {
T.showShort(thisActivity,"分享失败啦");
}
@Override
publicvoidonCancel(SHARE_MEDIA platform) {
T.showShort(thisActivity,"分享取消了");
}
})
.open();
}
privateView toastRoot;
privateToast toast =null;
privatevoidshowToast(String msg) {
TextView tv = (TextView) toastRoot.findViewById(R.id.TextViewInfo);
if(toast ==null) {
toast =newToast(CanbackWebActivity.this);
tv.setText(msg);
}else{
tv.setText(msg);
}
toast.setView(toastRoot);
toast.setGravity(Gravity.CENTER,0,0);
toast.show();
}
}
剩下就是布局文件里的webview了，这个就不提供了，以上仅供参考，因为所在项目的不同，部分可能需要自行改改。
csdn项目地址：http://blog.csdn.net/greatdaocaoren/article/details/54879723
