Android 实现带进度条的WebView的实例
1. WebView加载网页方法
//加载本地资源 loadUrl("file:///android_asset/example.html"); //加载网络资源 loadUrl("http://baidu.com");
2. 带进度的Drawable文件view_progress_webview
<?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@android:id/progress"> <clip> <shape> <solid android:color="#31CE15"/> <corners android:radius="2dp"/> </shape> </clip> </item> </layer-list>
颜色值为进度颜色，根据需要更换
3. ProgressWebView类
/** * 带进度条的WebView * @Author GQ */ public class ProgressWebView extends WebView { private ProgressBar progressbar; private Context mContext; public ProgressWebView(Context context, AttributeSet attrs) { super(context, attrs); this.mContext = context; progressbar = new ProgressBar(context, null, android.R.attr.progressBarStyleHorizontal); progressbar.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, 5, 0, 0)); Drawable drawable = context.getResources().getDrawable(R.drawable.view_progress_webview); progressbar.setProgressDrawable(drawable); addView(progressbar); //主要处理解析，渲染网页等浏览器做的事情 setWebViewClient(new WebViewClient() { @Override public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { super.onReceivedError(view, errorCode, description, failingUrl); //加载失败时候,显示自定义的页面 if (errorListener != null) { errorListener.onError(); } } }); //辅助WebView处理Javascript的对话框，网站图标，网站title，加载进度等 setWebChromeClient(new WebChromeClient()); getSettings().setSupportZoom(true);//是否可以缩放 getSettings().setBuiltInZoomControls(true); getSettings().setJavaScriptEnabled(true);//支持JS getSettings().setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS); getSettings().setUseWideViewPort(true); getSettings().setLoadWithOverviewMode(true); getSettings().setSaveFormData(true); getSettings().setDomStorageEnabled(true); //优先使用缓存 getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK); //禁用长按 setOnLongClickListener(new OnLongClickListener() { @Override public boolean onLongClick(View view) { return true; } }); //如果在浏览器下载,调用浏览器默认下载+通知栏 setDownloadListener(new DownloadListener() { @Override public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) { Uri uri = Uri.parse(url); Intent intent = new Intent(Intent.ACTION_VIEW, uri); mContext.startActivity(intent); } }); } public class WebChromeClient extends android.webkit.WebChromeClient { @Override public void onProgressChanged(WebView view, int newProgress) { if (newProgress == 100) { progressbar.setVisibility(GONE); } else { if (progressbar.getVisibility() == GONE) progressbar.setVisibility(VISIBLE); progressbar.setProgress(newProgress); } super.onProgressChanged(view, newProgress); } @Override public void onReceivedTitle(WebView view, String title) { super.onReceivedTitle(view, title); if (titleListener != null) titleListener.getTitle(title); } } @Override protected void onScrollChanged(int l, int t, int oldl, int oldt) { LayoutParams lp = (LayoutParams) progressbar.getLayoutParams(); lp.x = l; lp.y = t; progressbar.setLayoutParams(lp); super.onScrollChanged(l, t, oldl, oldt); } private TitleListener titleListener; public interface TitleListener { void getTitle(String title); } public void setOnTitleListener(TitleListener titleListener) { this.titleListener = titleListener; } private ErrorListener errorListener; public interface ErrorListener { void onError(); } public void setOnErrorListener(ErrorListener errorListener) { this.errorListener = errorListener; } }
4. 使用
/** * 公共WebView */ public class BasicWebActivity extends Activity { protected ProgressWebView progressWebView; private TextView title;//标题栏 private TextView tv_none;//加载失败显示文字 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.common_webview); title = (TextView) findViewById(R.id.title); tv_none = (TextView) findViewById(R.id.tv_none); progressWebView = (ProgressWebView) findViewById(R.id.progressWebView); String url = getIntent().getStringExtra("url"); progressWebView.setOnTitleListener(new ProgressWebView.TitleListener() { @Override public void getTitle(String title) { title.setText(title); } }); progressWebView.setOnErrorListener(new ProgressWebView.ErrorListener() { @Override public void onError() { tv_none.setText("url资源失效"); } }); //加载网页 progressWebView.loadUrl(url); } //重写返回键 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { if (progressWebView.canGoBack()) { progressWebView.goBack();//返回上一层页面 return true; } else { finish();//关闭页面 } } return super.onKeyDown(keyCode, event); } }
其中common_webview就包含一个title一个progressWebView就不贴代码了。
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