Android WebView 设置参考
Android About 8,282 words代码
mWebView.setHorizontalScrollBarEnabled(false);//水平不显示
mWebView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
//listview,webview中滚动拖动到顶部或者底部时的阴影
mWebView.setOverScrollMode(View.OVER_SCROLL_NEVER);
//取消滚动条白边效果
mWebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
WebSettings webSettings = mWebView.getSettings();
webSettings.setRenderPriority(RenderPriority.HIGH);//设置渲染优先级
webSettings.setLoadWithOverviewMode(true);//缩放至屏幕大小,一定要设置
webSettings.setJavaScriptEnabled(true);//支持JS
webSettings.setAllowFileAccess(true);//设置是否允许文件访问,默认是允许的
webSettings.setSaveFormData(true);//设置是否保存表单数据,默认是保存的
webSettings.setSavePassword(true);//设置是否保存密码,默认是保存的,过时了
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);//支持通过JS打开新窗口
webSettings.setUseWideViewPort(true);//是否启用支持视窗meta标记
webSettings.setTextSize(TextSize.NORMAL);// 固定页面字体大小
webSettings.setGeolocationEnabled(true);//启用地理定位
webSettings.setDatabaseEnabled(true);// 开启database storage API功能
webSettings.setDomStorageEnabled(true);// 开启DOM storage API 功能
String databasePath = this.getApplicationContext().getDir("database", Context.MODE_PRIVATE).getPath();
webSettings.setDatabasePath(databasePath);// 设置数据库缓存路径
webSettings.setGeolocationDatabasePath(databasePath);//设置定位的数据库路径
webSettings.setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN);//支持内容重新布局
webSettings.setSupportZoom(true);//支持缩放
webSettings.setBuiltInZoomControls(true);//设置支持缩放机制
webSettings.setDisplayZoomControls(false);//设置显示缩放控件
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
//设置当一个安全站点企图加载来自一个不安全站点资源时WebView的行为
//MIXED_CONTENT_ALWAYS_ALLOW
//MIXED_CONTENT_NEVER_ALLOW
//MIXED_CONTENT_COMPATIBILITY_MODE
webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
}
//在同种分辨率的情况下,屏幕密度不一样的情况下,自动适配页面:
DisplayMetrics dm = getResources().getDisplayMetrics();
int scale = dm.densityDpi;
if (scale >= DisplayMetrics.DENSITY_HIGH) {//240
mWebView.getSettings().setDefaultZoom(WebSettings.ZoomDensity.FAR);//far:240dp
} else if (scale == DisplayMetrics.DENSITY_MEDIUM) {//160
mWebView.getSettings().setDefaultZoom(WebSettings.ZoomDensity.MEDIUM);//medium:160dp
} else {
mWebView.getSettings().setDefaultZoom(WebSettings.ZoomDensity.CLOSE);//close:120dp
}
mWebView.setOnLongClickListener(new View.OnLongClickListener() {//禁止长按跳出复制弹窗
@Override
public boolean onLongClick(View view) {
return true;
}
});
mWebView.setDownloadListener(new DownloadListener() {
@Override
public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
try {
Uri uri = Uri.parse(url);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}
}
});
mWebView.setWebViewClient(new WebViewClient() {
private boolean isError = false;//signal
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error){
Log.d(TAG, "zbj onReceivedSslError");
//handler.cancel(); 默认的处理方式,WebView变成空白页
handler.proceed();//接受证书
}
//WebView重定向,多次返回键无效
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
WebView.HitTestResult hitTestResult = view.getHitTestResult();
//hitTestResult==null解决重定向问题
if (!TextUtils.isEmpty(url) && hitTestResult == null) {
view.loadUrl(url);
return true;
}
return super.shouldOverrideUrlLoading(view, url);
}
@Override
public void onReceivedError(WebView view, int errorCode, String description, String url) {
isError = true;
if (view != null){
view.stopLoading();
view.setVisibility(View.GONE);//NullPointerException
}
mErrorView.setVisibility(View.VISIBLE);
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if (isError) {
isError = false;
} else {
if (view != null)
view.setVisibility(View.VISIBLE);//NullPointerException
mErrorView.setVisibility(View.GONE);
}
}
}
mWebView.setWebChromeClient(new WebChromeClient() {
@Override
public void onProgressChanged(WebView view, final int progress) {
mProgressView.post(new Runnable() {
@Override
public void run() {
mProgressView.setProgress(progress);
if (progress <= 100) {
mProgressView.setVisibility(View.VISIBLE);
}
if (progress >= 100) {
mProgressView.post(new Runnable() {
@Override
public void run() {
mProgressView.setVisibility(View.GONE);
}
});
}
}
});
super.onProgressChanged(view, progress);
}
@Override
public void onExceededDatabaseQuota(String url, String databaseIdentifier, long currentQuota, long estimatedSize, long totalUsedQuota, WebStorage.QuotaUpdater quotaUpdater) {
quotaUpdater.updateQuota(5 * 1024 * 1024);
}
@Override
public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
callback.invoke(origin, true, true);
super.onGeolocationPermissionsShowPrompt(origin, callback);
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (mWebView.canGoBack()) {
mWebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
mWebView.stopLoading();
mWebView.goBack();//返回上一页面
return true;
} else {
finish();
}
}
return super.onKeyDown(keyCode, event);
}
@Override
protected void onDestroy() {
if (mWebView != null) {
((ViewGroup) mWebView.getParent()).removeView(mWebView);
mWebView.destroy();
mWebView = null;
}
super.onDestroy();
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return handlerScheme(url);
}
private static final String SCHEME_HTTP = "http";
private static final String SCHEME_HTTPS = "https";
private static final String SCHEME_FILE = "file";
private static final String SCHEME_TEL = "tel";
private static final String SCHEME_INTENT = "intent"; // Chrome Intent scheme;
private boolean handlerScheme(String url) {
Uri uri = Uri.parse(url);
String scheme = uri.getScheme();
if (!TextUtils.isEmpty(scheme)) {
scheme = scheme.toLowerCase(Locale.getDefault());
if (SCHEME_TEL.equals(scheme)) {
String number = url.substring(url.indexOf(":") + 1);
if (!TextUtils.isEmpty(number)) {
Intent it = new Intent(Intent.ACTION_DIAL, Uri.parse(SCHEME_TEL + ":" + number));
it.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(it);
}
return true;
} else if (SCHEME_INTENT.equals(scheme)) {
try {
Intent intent = Intent.parseUri(url, Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}
return true;
} else if (!SCHEME_HTTP.equals(scheme) && !SCHEME_HTTPS.equals(scheme)) {
try {
Log.d(TAG, "startActivity uri = " + uri);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}
return true;
}
}
Log.d(TAG, "scheme = " + scheme);
return false;
}
Views: 5,701 · Posted: 2019-04-11
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