我有来自Android 4.0.4中的UploadHandler类的webview。
我想在Web视图中添加进度条。
我尝试的所有代码都不起作用。 谁可以提供帮助。 ??！
这是我的MainAvtivity.java：
package com.com.myapplication;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.webkit.JsResult;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebSettings.PluginState;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
import java.io.File;
import java.lang.reflect.Method;
import java.net.URL;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
WebView webView = (WebView) findViewById(R.id.webview);
initWebView(webView);
webView.loadUrl("http://google"); // TODO input your url
}
private final static Object methodInvoke(Object obj, String method, Class<?>[] parameterTypes, Object[] args) {
try {
Method m = obj.getClass().getMethod(method, new Class[] { boolean.class });
m.invoke(obj, args);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private void initWebView(WebView webView) {
WebSettings settings = webView.getSettings();
WebView myWebView = (WebView) findViewById(R.id.webview);
myWebView.setWebViewClient(new WebViewClient());
settings.setJavaScriptEnabled(true);
settings.setAllowFileAccess(true);
settings.setDomStorageEnabled(true);
settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
settings.setLoadWithOverviewMode(true);
settings.setUseWideViewPort(true);
settings.setSupportZoom(true);
// settings.setPluginsEnabled(true);
methodInvoke(settings, "setPluginsEnabled", new Class[] { boolean.class }, new Object[] { true });
// settings.setPluginState(PluginState.ON);
methodInvoke(settings, "setPluginState", new Class[] { PluginState.class }, new Object[] { PluginState.ON });
// settings.setPluginsEnabled(true);
methodInvoke(settings, "setPluginsEnabled", new Class[] { boolean.class }, new Object[] { true });
// settings.setAllowUniversalAccessFromFileURLs(true);
methodInvoke(settings, "setAllowUniversalAccessFromFileURLs", new Class[] { boolean.class }, new Object[] { true });
// settings.setAllowFileAccessFromFileURLs(true);
methodInvoke(settings, "setAllowFileAccessFromFileURLs", new Class[] { boolean.class }, new Object[] { true });
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webView.clearHistory();
webView.clearFormData();
webView.clearCache(true);
webView.setWebChromeClient(new MyWebChromeClient());
// webView.setDownloadListener(downloadListener);
}
UploadHandler mUploadHandler;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == Controller.FILE_SELECTED) {
// Chose a file from the file picker.
if (mUploadHandler != null) {
mUploadHandler.onResult(resultCode, intent);
}
}
super.onActivityResult(requestCode, resultCode, intent);
}
class MyWebChromeClient extends WebChromeClient {
public MyWebChromeClient() {
}
private String getTitleFromUrl(String url) {
String title = url;
try {
URL urlObj = new URL(url);
String host = urlObj.getHost();
if (host != null && !host.isEmpty()) {
return urlObj.getProtocol() + "://" + host;
}
if (url.startsWith("file:")) {
String fileName = urlObj.getFile();
if (fileName != null && !fileName.isEmpty()) {
return fileName;
}
}
} catch (Exception e) {
// ignore
}
return title;
}
@Override
public boolean onJsAlert(WebView view, String url, String message, final JsResult result) {
String newTitle = getTitleFromUrl(url);
new AlertDialog.Builder(MainActivity.this).setTitle(newTitle).setMessage(message).setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
result.confirm();
}
}).setCancelable(false).create().show();
return true;
// return super.onJsAlert(view, url, message, result);
}
@Override
public boolean onJsConfirm(WebView view, String url, String message, final JsResult result) {
String newTitle = getTitleFromUrl(url);
new AlertDialog.Builder(MainActivity.this).setTitle(newTitle).setMessage(message).setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
result.confirm();
}
}).setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
result.cancel();
}
}).setCancelable(false).create().show();
return true;
// return super.onJsConfirm(view, url, message, result);
}
// Android 2.x
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
openFileChooser(uploadMsg, "");
}
// Android 3.0
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
openFileChooser(uploadMsg, "", "filesystem");
}
// Android 4.1
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
mUploadHandler = new UploadHandler(new Controller());
mUploadHandler.openFileChooser(uploadMsg, acceptType, capture);
}
};
class Controller {
final static int FILE_SELECTED = 4;
Activity getActivity() {
return MainActivity.this;
}
}
// copied from android-4.4.3_r1/src/com/android/browser/UploadHandler.java
//////////////////////////////////////////////////////////////////////
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// package com.android.browser;
//
// import android.app.Activity;
// import android.content.ActivityNotFoundException;
// import android.content.Intent;
// import android.net.Uri;
// import android.os.Environment;
// import android.provider.MediaStore;
// import android.webkit.ValueCallback;
// import android.widget.Toast;
//
// import java.io.File;
// import java.util.Vector;
//
// /**
// * Handle the file upload callbacks from WebView here
// */
// public class UploadHandler {
class UploadHandler {
/*
* The Object used to inform the WebView of the file to upload.
*/
private ValueCallback<Uri> mUploadMessage;
private String mCameraFilePath;
private boolean mHandled;
private boolean mCaughtActivityNotFoundException;
private Controller mController;
public UploadHandler(Controller controller) {
mController = controller;
}
String getFilePath() {
return mCameraFilePath;
}
boolean handled() {
return mHandled;
}
void onResult(int resultCode, Intent intent) {
if (resultCode == Activity.RESULT_CANCELED && mCaughtActivityNotFoundException) {
// Couldn't resolve an activity, we are going to try again so skip
// this result.
mCaughtActivityNotFoundException = false;
return;
}
Uri result = intent == null || resultCode != Activity.RESULT_OK ? null
: intent.getData();
// As we ask the camera to save the result of the user taking
// a picture, the camera application does not return anything other
// than RESULT_OK. So we need to check whether the file we expected
// was written to disk in the in the case that we
// did not get an intent returned but did get a RESULT_OK. If it was,
// we assume that this result has came back from the camera.
if (result == null && intent == null && resultCode == Activity.RESULT_OK) {
File cameraFile = new File(mCameraFilePath);
if (cameraFile.exists()) {
result = Uri.fromFile(cameraFile);
// Broadcast to the media scanner that we have a new photo
// so it will be added into the gallery for the user.
mController.getActivity().sendBroadcast(
new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, result));
}
}
mUploadMessage.onReceiveValue(result);
mHandled = true;
mCaughtActivityNotFoundException = false;
}
void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
final String imageMimeType = "image/*";
final String videoMimeType = "video/*";
final String audioMimeType = "audio/*";
final String mediaSourceKey = "capture";
final String mediaSourceValueCamera = "camera";
final String mediaSourceValueFileSystem = "filesystem";
final String mediaSourceValueCamcorder = "camcorder";
final String mediaSourceValueMicrophone = "microphone";
// According to the spec, media source can be 'filesystem' or 'camera' or 'camcorder'
// or 'microphone' and the default value should be 'filesystem'.
String mediaSource = mediaSourceValueFileSystem;
if (mUploadMessage != null) {
// Already a file picker operation in progress.
return;
}
mUploadMessage = uploadMsg;
// Parse the accept type.
String params[] = acceptType.split(";");
String mimeType = params[0];
if (capture.length() > 0) {
mediaSource = capture;
}
if (capture.equals(mediaSourceValueFileSystem)) {
// To maintain backwards compatibility with the previous implementation
// of the media capture API, if the value of the 'capture' attribute is
// "filesystem", we should examine the accept-type for a MIME type that
// may specify a different capture value.
for (String p : params) {
String[] keyValue = p.split("=");
if (keyValue.length == 2) {
// Process key=value parameters.
if (mediaSourceKey.equals(keyValue[0])) {
mediaSource = keyValue[1];
}
}
}
}
//Ensure it is not still set from a previous upload.
mCameraFilePath = null;
if (mimeType.equals(imageMimeType)) {
if (mediaSource.equals(mediaSourceValueCamera)) {
// Specified 'image/*' and requested the camera, so go ahead and launch the
// camera directly.
startActivity(createCameraIntent());
return;
} else {
// Specified just 'image/*', capture=filesystem, or an invalid capture parameter.
// In all these cases we show a traditional picker filetered on accept type
// so launch an intent for both the Camera and image/* OPENABLE.
Intent chooser = createChooserIntent(createCameraIntent());
chooser.putExtra(Intent.EXTRA_INTENT, createOpenableIntent(imageMimeType));
startActivity(chooser);
return;
}
} else if (mimeType.equals(videoMimeType)) {
if (mediaSource.equals(mediaSourceValueCamcorder)) {
// Specified 'video/*' and requested the camcorder, so go ahead and launch the
// camcorder directly.
startActivity(createCamcorderIntent());
return;
} else {
// Specified just 'video/*', capture=filesystem or an invalid capture parameter.
// In all these cases we show an intent for the traditional file picker, filtered
// on accept type so launch an intent for both camcorder and video/* OPENABLE.
Intent chooser = createChooserIntent(createCamcorderIntent());
chooser.putExtra(Intent.EXTRA_INTENT, createOpenableIntent(videoMimeType));
startActivity(chooser);
return;
}
} else if (mimeType.equals(audioMimeType)) {
if (mediaSource.equals(mediaSourceValueMicrophone)) {
// Specified 'audio/*' and requested microphone, so go ahead and launch the sound
// recorder.
startActivity(createSoundRecorderIntent());
return;
} else {
// Specified just 'audio/*', capture=filesystem of an invalid capture parameter.
// In all these cases so go ahead and launch an intent for both the sound
// recorder and audio/* OPENABLE.
Intent chooser = createChooserIntent(createSoundRecorderIntent());
chooser.putExtra(Intent.EXTRA_INTENT, createOpenableIntent(audioMimeType));
startActivity(chooser);
return;
}
}
// No special handling based on the accept type was necessary, so trigger the default
// file upload chooser.
startActivity(createDefaultOpenableIntent());
}
private void startActivity(Intent intent) {
try {
mController.getActivity().startActivityForResult(intent, Controller.FILE_SELECTED);
} catch (ActivityNotFoundException e) {
// No installed app was able to handle the intent that
// we sent, so fallback to the default file upload control.
try {
mCaughtActivityNotFoundException = true;
mController.getActivity().startActivityForResult(createDefaultOpenableIntent(),
Controller.FILE_SELECTED);
} catch (ActivityNotFoundException e2) {
// Nothing can return us a file, so file upload is effectively disabled.
Toast.makeText(mController.getActivity(), R.string.uploads_disabled,
Toast.LENGTH_LONG).show();
}
}
}
private Intent createDefaultOpenableIntent() {
// Create and return a chooser with the default OPENABLE
// actions including the camera, camcorder and sound
// recorder where available.
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("*/*");
Intent chooser = createChooserIntent(createCameraIntent(), createCamcorderIntent(),
createSoundRecorderIntent());
chooser.putExtra(Intent.EXTRA_INTENT, i);
return chooser;
}
private Intent createChooserIntent(Intent... intents) {
Intent chooser = new Intent(Intent.ACTION_CHOOSER);
chooser.putExtra(Intent.EXTRA_INITIAL_INTENTS, intents);
chooser.putExtra(Intent.EXTRA_TITLE,
mController.getActivity().getResources()
.getString(R.string.choose_upload));
return chooser;
}
private Intent createOpenableIntent(String type) {
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType(type);
return i;
}
private Intent createCameraIntent() {
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File externalDataDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DCIM);
File cameraDataDir = new File(externalDataDir.getAbsolutePath() +
File.separator + "browser-photos");
cameraDataDir.mkdirs();
mCameraFilePath = cameraDataDir.getAbsolutePath() + File.separator +
System.currentTimeMillis() + ".jpg";
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(mCameraFilePath)));
return cameraIntent;
}
private Intent createCamcorderIntent() {
return new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
}
private Intent createSoundRecorderIntent() {
return new Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION);
}
}
@Override
public void onBackPressed()
{
WebView webView = (WebView) findViewById(R.id.webview);
if(webView.canGoBack()){
webView.goBack();
}else{
super.onBackPressed();
}
}
}
这是我的布局Main.xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="fill"
android:id="@+id/rel_webpage_whole"
android:background="#000000"
>
<ProgressBar
android:layout_width="fill_parent"
android:layout_height="5dip"
android:layout_alignParentTop="true"
style="?android:attr/progressBarStyleHorizontal"
android:id="@+id/progressBar"
android:max="100"
android:background="#228b22"
/>
<WebView
android:id="@+id/webview"
android:layout_below="@id/progressBar"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerVertical="true"
android:layout_centerInParent="true"
/>
</RelativeLayout>
TNX !!! ：）
答案 0 :(得分：0)
您可以按如下方式使用布局：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<ProgressBar
android:id="@+id/progressDialog"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
现在在你的代码中
ProgressDialog progressDialog = (ProgressDialog)findViewById(R.id.progressDialog);
progressDialog.setTitle("Loading");
progressDialog.setMessage("Your Message");
progressDialog.show();
一旦加载完webview内容或完成预期的操作，
progressDialog.dismiss();
如果您想要水平进度对话
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
如果你知道进展
progressDialog.setProgress(0);
progressDialog.setMax(100);
并在您的主题中设置进度。如果你不了解进展，
progressDialog.setIndeterminate(true);
答案 1 :(得分：0)
像这样初始化进度条：
ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressDialog);
这是错误的演员：
ProgressDialog progressDialog = (ProgressDialog)findViewById(R.id.progressDialog);
答案 2 :(得分：0)
使用以下示例代码：
WebView view= new WebView(getApplicationContext());
view.setWebViewClient(new WebViewClient(){
ProgressDialog dialog= new ProgressDialog(getApplicationContext());
@Override
public void onPageStarted(WebView view, String url,
Bitmap favicon) {
// TODO Auto-generated method stub
dialog.setMessage("Loading please wait");
dialog.show();
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
dialog.dismiss();
super.onPageFinished(view, url);
}
});
如果偶然的应用程序崩溃，那么使用＆＃34; MainActivity.this＆＃34;代替getapplicationContext。 希望这能解决你的问题。
我使用下面的代码显示对话框：
private void initWebView(WebView view, String url) {
WebSettings settings = view.getSettings();
// WebView myWebView = (WebView) findViewById(R.id.webview);
view.setWebViewClient(new WebViewClient());
settings.setJavaScriptEnabled(true);
settings.setAllowFileAccess(true);
settings.setDomStorageEnabled(true);
settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
settings.setLoadWithOverviewMode(true);
settings.setUseWideViewPort(true);
settings.setSupportZoom(true);
// settings.setPluginsEnabled(true);
methodInvoke(settings, "setPluginsEnabled", new Class[] { boolean.class }, new Object[] { true });
// settings.setPluginState(PluginState.ON);
methodInvoke(settings, "setPluginState", new Class[] { PluginState.class }, new Object[] { PluginState.ON });
// settings.setPluginsEnabled(true);
methodInvoke(settings, "setPluginsEnabled", new Class[] { boolean.class }, new Object[] { true });
// settings.setAllowUniversalAccessFromFileURLs(true);
methodInvoke(settings, "setAllowUniversalAccessFromFileURLs", new Class[] { boolean.class }, new Object[] { true });
// settings.setAllowFileAccessFromFileURLs(true);
methodInvoke(settings, "setAllowFileAccessFromFileURLs", new Class[] { boolean.class }, new Object[] { true });
view.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
view.clearHistory();
view.clearFormData();
view.clearCache(true);
view.loadUrl(url);
view.setWebViewClient(new WebViewClient(){
ProgressDialog dialog= new ProgressDialog(getApplicationContext());
// suppose Imageview and Webview has visibility gone by default then
@Override
public void onPageStarted(WebView view, String url,
Bitmap favicon) {
// TODO Auto-generated method stub
//dialog.setMessage("Loading please wait");
//dialog.show();
Imageview.setvisivility(View.VISIBLE);
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
//dialog.dismiss();
imageview.setvisibility(View.GONE);
view.setvisibility(View.VISIBLE);
super.onPageFinished(view, url);
}
});
view.setWebChromeClient(new MyWebChromeClient());
// webView.setDownloadListener(downloadListener);
}
现在你的Onceate方法;
String url="http://stackoverflow.com/posts/25986941"
WebView v= (Webview)findviewbyId(R.id.webviewid);
initWebView(v,url);
答案 3 :(得分：0)
使用此代码，您可以在Web视图页面加载完成后向webview显示progressdialog并关闭对话框
public class Activity extends ActionBarActivity {
WebView myBrowser;
ProgressDialog progress;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mapwebview);
myBrowser = (WebView)findViewById(R.id.mybrowser);
myBrowser.setWebViewClient(new WebViewClient() {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
progress = ProgressDialog.show(Activity.this, "Please Wait", "Refreshing");
}
@Override
public void onPageFinished(WebView view, String url) {
if (progress.isShowing()) {
progress.dismiss();
}
}
});
//load saved file
Log.e("PAth", getFilesDir().toString());
myBrowser.loadUrl("file:///"+getFilesDir()+"/MySampleFile.html");
myBrowser.getSettings().setJavaScriptEnabled(true);
myBrowser.getSettings().setBuiltInZoomControls(true);
}
}