Android中WebView的设置与使用
1、WebSettings的设置：
介绍websettings的常用的一些
WebSettings settings = webview.getSettings();
settings .setRenderPriority(WebSettings.RenderPriority.HIGH);
//开启本地DOM存储
settings.setDomStorageEnabled(true);
settings.setUseWideViewPort(true);
settings.setLoadWithOverviewMode(true);
// 是否可访问Content Provider的资源，默认值 true
settings.setAllowContentAccess(true);
// 是否可访问本地文件，默认值 true
settings.setAllowFileAccess(true);
// 是否允许通过file url加载的Javascript读取本地文件，默认值 false
settings.setAllowFileAccessFromFileURLs(false);
// 是否允许通过file url加载的Javascript读取全部资源(包括文件,http,https)，默认值 false
settings.setAllowUniversalAccessFromFileURLs(false);
settings.setJavaScriptEnabled(true);
settings.setSupportZoom(true);2、WebViewClient的设置：
webview.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// TODO Auto-generated method stub
view.loadUrl(url);
return super.shouldOverrideUrlLoading(view, url);
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
}
});3、WebChromeClient的设置
这里只是进行一汇总一些自己用到的以及常用的设置
此为打开手机本地内存时调用的方法：
webview.setWebChromeClient(new WebChromeClient() {
@Override
public boolean onShowFileChooser(WebView webView,
ValueCallback filePathCallback,
FileChooserParams fileChooserParams) {
mUploadCallbackAboveL = filePathCallback;
takeSDstorage();
return true;
}
public void openFileChooser(ValueCallback uploadMsg) {
mUploadMessage = uploadMsg;
takeSDstorage();
}
public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
mUploadMessage = uploadMsg;
takeSDstorage();
}
public void openFileChooser(ValueCallback uploadMsg, String acceptType, String capture) {
mUploadMessage = uploadMsg;
takeSDstorage();
}
}); 其他常用的拦截设置
/**
* 当网页调用alert()来弹出alert弹出框前回调，用以拦截alert()函数
*/
public boolean onJsAlert(WebView view, String url, String message,JsResult result)
/**
* 当网页调用confirm()来弹出confirm弹出框前回调，用以拦截confirm()函数
*/
public boolean onJsConfirm(WebView view, String url, String message,JsResult result)
/**
* 当网页调用prompt()来弹出prompt弹出框前回调，用以拦截prompt()函数
*/
public boolean onJsPrompt(WebView view, String url, String message,String defaultValue, JsPromptResult result)
/**
* 打印 console 信息
*/
public boolean onConsoleMessage(ConsoleMessage consoleMessage)
/**
* 通知程序当前页面加载进度
*/
public void onProgressChanged(WebView view, int newProgress)
4、调取本地内存，选取索要上传的文件
全局变量定义：
/**
* 表单的数据信息
*/
private ValueCallback mUploadMessage;
private ValueCallback mUploadCallbackAboveL;
/**
* 表单的结果回调
*/
private final static int FILECHOOSER_RESULTCODE = 1;
private Uri imageUri;
File file; 方法：
private void takeSDstorage() {
File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.getExternalStorageState()), "MyApp");
// Create the storage directory if it does not exist
if (!imageStorageDir.exists()) {
imageStorageDir.mkdirs();
}
imageUri = Uri.fromFile(imageStorageDir);
final List cameraIntents = new ArrayList();
final Intent captureIntent = new Intent(MediaStore.AUTHORITY);
final PackageManager packageManager = getPackageManager();
final List listCam = packageManager.queryIntentActivities(captureIntent, 0);
for (ResolveInfo res : listCam) {
final String packageName = res.activityInfo.packageName;
final Intent i = new Intent(captureIntent);
i.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
i.setPackage(packageName);
i.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
cameraIntents.add(i);
}
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setDataAndType(imageUri, MapTable.getMIMEType(imageStorageDir.getName()));
Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[]{}));
WebviewSummaryActivity.this.startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
} 5、选取好本地文件后进行上传时的回调
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == FILECHOOSER_RESULTCODE) {
if (null == mUploadMessage && null == mUploadCallbackAboveL) {
return;
}
Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
if (mUploadCallbackAboveL != null) {
onActivityResultAboveL(requestCode, resultCode, data);
} else if (mUploadMessage != null) {
Log.e("result", result + "");
if (result == null) {
mUploadMessage.onReceiveValue(imageUri);
mUploadMessage = null;
Log.e("imageUri", imageUri + "");
} else {
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
}
}
}
}
@SuppressWarnings("null")
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void onActivityResultAboveL(int requestCode, int resultCode, Intent data) {
if (requestCode != FILECHOOSER_RESULTCODE
|| mUploadCallbackAboveL == null) {
return;
}
Uri[] results = null;
if (resultCode == Activity.RESULT_OK) {
if (data == null) {
results = new Uri[]{imageUri};
} else {
String dataString = data.getDataString();
ClipData clipData = data.getClipData();
if (clipData != null) {
results = new Uri[clipData.getItemCount()];
for (int i = 0; i < clipData.getItemCount(); i++) {
ClipData.Item item = clipData.getItemAt(i);
results[i] = item.getUri();
}
}
if (dataString != null) {
results = new Uri[]{Uri.parse(dataString)};
}
}
}
if (results != null) {
mUploadCallbackAboveL.onReceiveValue(results);
mUploadCallbackAboveL = null;
} else {
results = new Uri[]{imageUri};
mUploadCallbackAboveL.onReceiveValue(results);
mUploadCallbackAboveL = null;
}
return;
}6、H5页面调用原生方法：
本地方法：
class JavaScriptInterfaces {
JavaScriptInterfaces() {
}
@JavascriptInterface
public void backUpperLevel() {
webView.loadUrl(url);
}
}@JavascriptInterface注释必须添加，
初始化时添加：
webView.addJavascriptInterface(new JavaScriptInterfaces(), "android");参数一：具体的对象，也就是H5与Android交互的实体类
参数二：参数一对象的实例化对象，也就是给前端调用的类名
本文主要是以自己所用要的WebView时所用到的进行汇总记录