现在混合开发APP已经成为了一种趋势，某些功能用H5解决的就用H5来做了，最近遇到一个需求，就是在H5界面里面有一个图片上传功能，还有附件下载功能，安卓的webView如果不通过一些设置的话是不可以的。下面要说的就是用H5来打开手机的图库，并进行图片上传功能，还有下载功能。
首先是要继承WebChromeClient这个类，WebChromeClient主要辅助WebView处理Javascript的对话框、网站图标、网站title、加载进度等。
class MyWebChromeClient extends WebChromeClient {
// For Android 3.0+
public void openFileChooser(ValueCallback<Uri> uploadMsg,
String acceptType) {
if (mUploadMessage != null)
return;
mUploadMessage = uploadMsg;
selectImage(RESULT_CODE_PICK_FROM_ALBUM_BELLOW_LOLLILOP);
}
// For Android < 3.0
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
openFileChooser(uploadMsg, "");
}
// For Android > 4.1.1
public void openFileChooser(ValueCallback<Uri> uploadMsg,
String acceptType, String capture) {
openFileChooser(uploadMsg, acceptType);
}
// For Android 5.0+
public boolean onShowFileChooser(WebView webView,
ValueCallback<Uri[]> filePathCallback,
FileChooserParams fileChooserParams) {
mUploadCallbackAboveL = filePathCallback;
selectImage(RESULT_CODE_PICK_FROM_ALBUM_ABOVE_LOLLILOP);
return true;
}
@Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
}
}
openFileChooser和onShowFileChooser方法，当网络上页面点击了 <input type="file"/> 的标签时，不同版本的SDK调用openFileChooser或者onShowFileChooser。
选择完图片后，进入onActivityResult，根据不同的requestCode值区分开AndroidSDK 5.0以上和5.0以下，5.0以下传回Uri对象，5.0以上传回Uri数组。其中处理下onActivityResult传回来的意图数据，将Intent数据转换乌里分类中翻译。
/**选择后，回传值*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (mUploadMessage == null && mUploadCallbackAboveL == null) {
return;
}
Uri uri = null;
switch (requestCode) {
case RESULT_CODE_PICK_FROM_ALBUM_BELLOW_LOLLILOP:
uri = afterChosePic(data);
if (mUploadMessage != null) {
mUploadMessage.onReceiveValue(uri);
mUploadMessage = null;
}
break;
case RESULT_CODE_PICK_FROM_ALBUM_ABOVE_LOLLILOP:
try {
uri = afterChosePic(data);
if (uri == null) {
mUploadCallbackAboveL.onReceiveValue(new Uri[] { });
mUploadCallbackAboveL = null;
break;
}
if (mUploadCallbackAboveL != null && uri != null) {
mUploadCallbackAboveL.onReceiveValue(new Uri[] { uri });
mUploadCallbackAboveL = null;
}
} catch (Exception e) {
mUploadCallbackAboveL = null;
e.printStackTrace();
}
break;
}
}**
下面把完整的代码贴上来：
**
WebViewActivity.java
package com.lwd.webviewupimg;
import java.io.File;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore.Images.ImageColumns;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebSettings.LayoutAlgorithm;
import android.webkit.WebView;
import android.webkit.WebViewClient;
/**
* @author lwd
* @create 2016年8月17日
*/
@SuppressLint("SetJavaScriptEnabled")
public class WebViewActivity extends Activity{
private WebView webview;
private ValueCallback<Uri> mUploadMessage;
private ValueCallback<Uri[]> mUploadCallbackAboveL;
private final int RESULT_CODE_PICK_FROM_ALBUM_BELLOW_LOLLILOP = 1;
private final int RESULT_CODE_PICK_FROM_ALBUM_ABOVE_LOLLILOP = 2;
private String url = "";//这里添加含有图片上传功能的H5页面访问地址即可。
String compressPath = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome);
initData();
}
public void initData() {
webview = (WebView) findViewById(R.id.webview);
initWebView();
webview.loadUrl(url);
}
@SuppressWarnings("deprecation")
private void initWebView(){
webview.setScrollBarStyle(View.GONE);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
webview.getSettings().setDomStorageEnabled(false);
webview.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
webview.getSettings().setPluginState(WebSettings.PluginState.ON);
webview.getSettings().setAllowFileAccess(true);
webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
webview.getSettings().setLayoutAlgorithm(LayoutAlgorithm.NORMAL);
webview.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
webview.getSettings().setUseWideViewPort(true);
webview.getSettings().setLoadWithOverviewMode(true);
webview.getSettings().setAllowContentAccess(true);
webview.requestFocus();
webview.setWebViewClient(new WebClient());
webview.setWebChromeClient(new MyWebChromeClient());
}
/**选择后，回传值*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (mUploadMessage == null && mUploadCallbackAboveL == null) {
return;
}
Uri uri = null;
switch (requestCode) {
case RESULT_CODE_PICK_FROM_ALBUM_BELLOW_LOLLILOP:
uri = afterChosePic(data);
if (mUploadMessage != null) {
mUploadMessage.onReceiveValue(uri);
mUploadMessage = null;
}
break;
case RESULT_CODE_PICK_FROM_ALBUM_ABOVE_LOLLILOP:
try {
uri = afterChosePic(data);
if (uri == null) {
mUploadCallbackAboveL.onReceiveValue(new Uri[] { });
mUploadCallbackAboveL = null;
break;
}
if (mUploadCallbackAboveL != null && uri != null) {
mUploadCallbackAboveL.onReceiveValue(new Uri[] { uri });
mUploadCallbackAboveL = null;
}
} catch (Exception e) {
mUploadCallbackAboveL = null;
e.printStackTrace();
}
break;
}
}
/**
* 选择照片后结束
* @param data
*/
private Uri afterChosePic(Intent data) {
if (data == null) {
return null;
}
String path = getRealFilePath(data.getData());
String[] names = path.split("\\.");
String endName = null;
if (names != null) {
endName = names[names.length - 1];
}
if (endName != null) {
compressPath = compressPath.split("\\.")[0] + "." + endName;
}
File newFile;
try {
newFile = FileUtils.compressFile(path, compressPath);
} catch (Exception e) {
newFile = null;
}
return Uri.fromFile(newFile);
}
/**
* 根据Uri获取图片文件的绝对路径
*/
public String getRealFilePath(final Uri uri) {
if (null == uri) {
return null;
}
final String scheme = uri.getScheme();
String data = null;
if (scheme == null) {
data = uri.getPath();
} else if (ContentResolver.SCHEME_FILE.equals(scheme)) {
data = uri.getPath();
} else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
Cursor cursor = getContentResolver().query(uri,
new String[] { ImageColumns.DATA }, null, null, null);
if (null != cursor) {
if (cursor.moveToFirst()) {
int index = cursor.getColumnIndexOrThrow(ImageColumns.DATA);
if (index > -1) {
data = cursor.getString(index);
}
}
cursor.close();
}
}
return data;
}
@Override
public void onBackPressed() {
super.onBackPressed();
if(webview.canGoBack()){
webview.goBack();
}else{
finish();
}
}
private class WebClient extends WebViewClient {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
/**打开图库,同时处理图片（项目业务需要统一命名）*/
private void selectImage(int resultCode) {
compressPath = Environment.getExternalStorageDirectory().getPath() + "/QWB/temp";
File file = new File(compressPath);
if (!file.exists()) {
file.mkdirs();
}
compressPath = compressPath + File.separator + "compress.png";
File image = new File(compressPath);
if (image.exists()) {
image.delete();
}
Intent intent = new Intent(
Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, resultCode);
}
/**
* 内部类
*/
class MyWebChromeClient extends WebChromeClient {
//openFileChooser（隐藏方法）仅适用android5.0以下的环境，android5.0及以上使用onShowFileChooser
// For Android 3.0+
public void openFileChooser(ValueCallback<Uri> uploadMsg,
String acceptType) {
if (mUploadMessage != null)
return;
mUploadMessage = uploadMsg;
selectImage(RESULT_CODE_PICK_FROM_ALBUM_BELLOW_LOLLILOP);
}
// For Android < 3.0
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
openFileChooser(uploadMsg, "");
}
// For Android > 4.1.1
public void openFileChooser(ValueCallback<Uri> uploadMsg,
String acceptType, String capture) {
openFileChooser(uploadMsg, acceptType);
}
// For Android 5.0+
public boolean onShowFileChooser(WebView webView,
ValueCallback<Uri[]> filePathCallback,
FileChooserParams fileChooserParams) {
mUploadCallbackAboveL = filePathCallback;
selectImage(RESULT_CODE_PICK_FROM_ALBUM_ABOVE_LOLLILOP);
return true;
}
@Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
}
}
}
●
package com.lwd.webviewupimg;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.text.TextUtils;
import android.util.Log;
public class FileUtils {
/**
* 把图片压缩到200K
*
* @param oldpath
* 压缩前的图片路径
* @param newPath
* 压缩后的图片路径
* @return
*/
public static File compressFile(String oldpath, String newPath) {
Bitmap compressBitmap = FileUtils.decodeFile(oldpath);
Bitmap newBitmap = ratingImage(oldpath, compressBitmap);
ByteArrayOutputStream os = new ByteArrayOutputStream();
newBitmap.compress(CompressFormat.PNG, 100, os);
byte[] bytes = os.toByteArray();
File file = null ;
try {
file = FileUtils.getFileFromBytes(bytes, newPath);
} catch (Exception e) {
e.printStackTrace();
}finally{
if(newBitmap != null ){
if(!newBitmap.isRecycled()){
newBitmap.recycle();
}
newBitmap = null;
}
if(compressBitmap != null ){
if(!compressBitmap.isRecycled()){
compressBitmap.recycle();
}
compressBitmap = null;
}
}
return file;
}
private static Bitmap ratingImage(String filePath,Bitmap bitmap){
int degree = readPictureDegree(filePath);
return rotaingImageView(degree, bitmap);
}
/**
* 旋转图片
* @param angle
* @param bitmap
* @return Bitmap
*/
public static Bitmap rotaingImageView(int angle , Bitmap bitmap) {
//旋转图片 动作
Matrix matrix = new Matrix();;
matrix.postRotate(angle);
System.out.println("angle2=" + angle);
// 创建新的图片
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,
bitmap.getWidth(), bitmap.getHeight(), matrix, true);
return resizedBitmap;
}
/**
* 读取图片属性：旋转的角度
* @param path 图片绝对路径
* @return degree旋转的角度
*/
public static int readPictureDegree(String path) {
int degree = 0;
try {
ExifInterface exifInterface = new ExifInterface(path);
int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
degree = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
degree = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
degree = 270;
break;
}
} catch (IOException e) {
e.printStackTrace();
}
return degree;
}
/**
* 把字节数组保存为一个文件
*
* @param b
* @param outputFile
* @return
*/
public static File getFileFromBytes(byte[] b, String outputFile) {
File ret = null;
BufferedOutputStream stream = null;
try {
ret = new File(outputFile);
FileOutputStream fstream = new FileOutputStream(ret);
stream = new BufferedOutputStream(fstream);
stream.write(b);
} catch (Exception e) {
// log.error("helper:get file from byte process error!");
e.printStackTrace();
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
// log.error("helper:get file from byte process error!");
e.printStackTrace();
}
}
}
return ret;
}
/**
* 图片压缩
*
* @param fPath
* @return
*/
public static Bitmap decodeFile(String fPath) {
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inJustDecodeBounds = true;
opts.inDither = false; // Disable Dithering mode
opts.inPurgeable = true; // Tell to gc that whether it needs free
opts.inInputShareable = true; // Which kind of reference will be used to
BitmapFactory.decodeFile(fPath, opts);
final int REQUIRED_SIZE = 200;
int scale = 1;
if (opts.outHeight > REQUIRED_SIZE || opts.outWidth > REQUIRED_SIZE) {
final int heightRatio = Math.round((float) opts.outHeight
/ (float) REQUIRED_SIZE);
final int widthRatio = Math.round((float) opts.outWidth
/ (float) REQUIRED_SIZE);
scale = heightRatio < widthRatio ? heightRatio : widthRatio;//
}
Log.i("scale", "scal ="+ scale);
opts.inJustDecodeBounds = false;
opts.inSampleSize = scale;
Bitmap bm = BitmapFactory.decodeFile(fPath, opts).copy(Config.ARGB_8888, false);
return bm;
}
/**
* 创建目录
* @param path
*/
public static void setMkdir(String path)
{
File file = new File(path);
if(!file.exists())
{
file.mkdirs();
Log.e("file", "目录不存在 创建目录 ");
}else{
Log.e("file", "目录存在");
}
}
/**
* 获取目录名称
* @param url
* @return FileName
*/
public static String getFileName(String url)
{
int lastIndexStart = url.lastIndexOf("/");
if(lastIndexStart!=-1)
{
return url.substring(lastIndexStart+1, url.length());
}else{
return null;
}
}
/**
* 删除该目录下的文件
*
* @param path
*/
public static void delFile(String path) {
if (!TextUtils.isEmpty(path)) {
File file = new File(path);
if (file.exists()) {
file.delete();
}
}
}
}
上面介绍了webView的上传，下面来介绍一下WebView的下载功能，
WebView控制调用相应的WEB页面进行展示。当碰到页面有下载链接的时候，点击上去是一点反应都没有的。原来是因为WebView默认没有开启文件下载的功能，如果要实现文件下载的功能，需要设置WebView的DownloadListener，通过实现自己的DownloadListener来实现文件的下载。具体操作如下：
1、设置WebView的DownloadListener：
webView.setDownloadListener(new MyWebViewDownLoadListener());
2、实现MyWebViewDownLoadListener这个类，具体可以如下这样：
private class MyWebViewDownLoadListener implements DownloadListener{
@Override
public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype,
long contentLength) {
Log.i("tag", "url="+url);
Log.i("tag", "userAgent="+userAgent);
Log.i("tag", "contentDisposition="+contentDisposition);
Log.i("tag", "mimetype="+mimetype);
Log.i("tag", "contentLength="+contentLength);
Uri uri = Uri.parse(url);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
}
这只是调用系统中已经内置的浏览器进行下载，还没有WebView本身进行的文件下载，不过，这也基本上满足我们的应用场景了。
我在项目中的运用
项目要求这样：
1，需要使用WebView加载一个网页；
2，网页中有文件下载的链接，点击后需要下载文件到SDcard；
3，然后自动打开文件；
下面是具体解决办法
第一步，对WebView进行一系列设置。
WebView webview=(WebView)layout.findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
webview.setWebChromeClient(new MyWebChromeClient());
webview.requestFocus();
// webview.loadUrl("file:///android_asset/risktest.html");
webview.loadUrl(jcrs_sub.get(position).addr);
// 设置web视图客户端
webview.setWebViewClient(new MyWebViewClient());
webview.setDownloadListener(new MyWebViewDownLoadListener());
//内部类
public class MyWebViewClient extends WebViewClient {
// 如果页面中链接，如果希望点击链接继续在当前browser中响应，
// 而不是新开Android的系统browser中响应该链接，必须覆盖 webview的WebViewClient对象。
public boolean shouldOverviewUrlLoading(WebView view, String url) {
L.i("shouldOverviewUrlLoading");
view.loadUrl(url);
return true;
}
public void onPageStarted(WebView view, String url, Bitmap favicon) {
L.i("onPageStarted");
showProgress();
}
public void onPageFinished(WebView view, String url) {
L.i("onPageFinished");
closeProgress();
}
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
L.i("onReceivedError");
closeProgress();
}
}
// 如果不做任何处理，浏览网页，点击系统“Back”键，整个Browser会调用finish()而结束自身，
// 如果希望浏览的网 页回退而不是推出浏览器，需要在当前Activity中处理并消费掉该Back事件。
public boolean onKeyDown(int keyCode, KeyEvent event) {
// if((keyCode==KeyEvent.KEYCODE_BACK)&&webview.canGoBack()){
// webview.goBack();
// return true;
// }
return false;
}
//内部类
private class MyWebViewDownLoadListener implements DownloadListener {
@Override
public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype,
long contentLength) {
if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
Toast t=Toast.makeText(mContext, "需要SD卡。", Toast.LENGTH_LONG);
t.setGravity(Gravity.CENTER, 0, 0);
t.show();
return;
}
DownloaderTask task=new DownloaderTask();
task.execute(url);
}
}
//内部类
private class DownloaderTask extends AsyncTask<String, Void, String> {
public DownloaderTask() {
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
String url=params[0];
// Log.i("tag", "url="+url);
String fileName=url.substring(url.lastIndexOf("/")+1);
fileName=URLDecoder.decode(fileName);
Log.i("tag", "fileName="+fileName);
File directory=Environment.getExternalStorageDirectory();
File file=new File(directory,fileName);
if(file.exists()){
Log.i("tag", "The file has already exists.");
return fileName;
}
try {
HttpClient client = new DefaultHttpClient();
// client.getParams().setIntParameter("http.socket.timeout",3000);//设置超时
HttpGet get = new HttpGet(url);
HttpResponse response = client.execute(get);
if(HttpStatus.SC_OK==response.getStatusLine().getStatusCode()){
HttpEntity entity = response.getEntity();
InputStream input = entity.getContent();
writeToSDCard(fileName,input);
input.close();
// entity.consumeContent();
return fileName;
}else{
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
@Override
protected void onCancelled() {
// TODO Auto-generated method stub
super.onCancelled();
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
closeProgressDialog();
if(result==null){
Toast t=Toast.makeText(mContext, "连接错误！请稍后再试！", Toast.LENGTH_LONG);
t.setGravity(Gravity.CENTER, 0, 0);
t.show();
return;
}
Toast t=Toast.makeText(mContext, "已保存到SD卡。", Toast.LENGTH_LONG);
t.setGravity(Gravity.CENTER, 0, 0);
t.show();
File directory=Environment.getExternalStorageDirectory();
File file=new File(directory,result);
Log.i("tag", "Path="+file.getAbsolutePath());
Intent intent = getFileIntent(file);
startActivity(intent);
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
showProgressDialog();
}
@Override
protected void onProgressUpdate(Void... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}
}
经过上面的操作就完成了webView的上传和下载功能了。本人亲自测试过了，是有效果的，
大家都有了以上相同的教程，但是人和人之间的区别在于：别人有颗更强大的内心，可怕的是比你聪明的人比你还要更努力！！
当你下定决心，准备前行的时候，剩下的只有坚持了。。。
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
