Android-在WebView中选择文件按钮
我遇到了一个问题，我在WebView中加载了一个页面——我不打算发布整个应用程序的代码，因为我的问题非常具体：我的HTML页面中的“选择文件”按钮在Android Studio创建的emulator上起作用，但在其他任何地方都不起作用 该按钮运行以下代码：Android-在WebView中选择文件按钮,android,webview,Android,Webview,我遇到了一个问题，我在WebView中加载了一个页面——我不打算发布整个应用程序的代码，因为我的问题非常具体：我的HTML页面中的“选择文件”按钮在Android Studio创建的emulator上起作用，但在其他任何地方都不起作用 该按钮运行以下代码： <input type='file' id='fileInput' accept='text/plain' onchange='openFile(event);'> var openFile = function(event) {
<input type='file' id='fileInput' accept='text/plain' onchange='openFile(event);'>
var openFile = function(event) {
var input = event.target;
var reader = new FileReader();
reader.onload = function(e){
/* various string parsing */
};
reader.readAsText(input.files[0]);
};
var openFile=函数（事件）{
var输入=event.target；
var reader=new FileReader（）；
reader.onload=函数（e）{
/*各种字符串解析*/
};
reader.readAsText（input.files[0]）；
};
我需要该应用程序在允许语音转换为文本的设备上工作，所以我不能像我所希望的那样只使用模拟器。设置
WebChromeClientimport android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import android.widget.Toast;
import org.apache.http.util.EncodingUtils;
public class BrowserScreen extends Activity {
private WebView webView;
private String url = "url";
private ValueCallback<Uri> mUploadMessage;
private final static int FILECHOOSER_RESULTCODE = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.browser_activity);
initFields();
setListeners();
}
public void initFields() {
// TODO Auto-generated method stub
webView = (WebView) findViewById(R.id.webView1);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setAllowFileAccess(true);
}
public void setListeners() {
// TODO Auto-generated method stub
webView.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
webView.loadUrl("about:blank");
view.clearHistory();
}
});
webView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
}
//The undocumented magic method override
//Eclipse will swear at you if you try to put @Override here
// For Android 3.0+
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
}
// For Android 3.0+
public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("*/*");
startActivityForResult(
Intent.createChooser(i, "File Browser"),
FILECHOOSER_RESULTCODE);
}
//For Android 4.1
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
}
});
webView.loadUrl(url);
final MyJavaScriptInterface myJavaScriptInterface
= new MyJavaScriptInterface(this);
webView.addJavascriptInterface(myJavaScriptInterface, "AndroidFunction");
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
if (webView.canGoBack() == true) {
webView.goBack();
} else {
super.onBackPressed();
}
}
public class MyJavaScriptInterface {
Context mContext;
MyJavaScriptInterface(Context c) {
mContext = c;
}
@JavascriptInterface
public void showToast(String toast) {
Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
// webView.loadUrl("javascript:document.getElementById(\"Button3\").innerHTML = \"bye\";");
}
@JavascriptInterface
public void openAndroidDialog() {
AlertDialog.Builder myDialog
= new AlertDialog.Builder(BrowserScreen.this);
myDialog.setTitle("DANGER!");
myDialog.setMessage("You can do what you want!");
myDialog.setPositiveButton("ON", null);
myDialog.show();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
if (requestCode == FILECHOOSER_RESULTCODE) {
if (null == mUploadMessage) return;
Uri result = intent == null || resultCode != RESULT_OK ? null
: intent.getData();
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
}
}
}
导入android.app.AlertDialog；
导入android.content.Context；
导入android.content.Intent；
导入android.net.Uri；
导入android.os.Bundle；
导入android.view.view；
导入android.webkit.JavascriptInterface；
导入android.webkit.ValueCallback；
导入android.webkit.WebChromeClient；
导入android.webkit.WebView；
导入android.webkit.WebViewClient；
导入android.widget.ProgressBar；
导入android.widget.Toast；
导入org.apache.http.util.EncodingUtils；
公共类BrowserScreen扩展活动{
私有网络视图；
私有字符串url=“url”；
private ValueCallback mUploadMessage；
private final static int FILECHOOSER_RESULTCODE=1；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
//TODO自动生成的方法存根
super.onCreate（savedInstanceState）；
setContentView（R.layout.browser_活动）；
initFields（）；
setListeners（）；
}
公共字段（）{
//TODO自动生成的方法存根
webView=（webView）findViewById（R.id.webView1）；
webView.getSettings（）.setJavaScriptEnabled（true）；
webView.getSettings（）.setBuilTinZoomControl（true）；
webView.getSettings（）.setAllowFileAccess（true）；
}
public void setListeners（）{
//TODO自动生成的方法存根
setWebViewClient（新的WebViewClient（）{
public void onReceivedError（WebView视图、int错误代码、字符串描述、字符串失败URL）{
loadUrl（“关于：空白”）；
view.clearHistory（）；
}
});
setWebView.WebChromeClient（新WebChromeClient（）{
public void onProgressChanged（WebView视图，int-progress）{
}
//未记录的magic方法重写
//如果您试图在此处放置@Override，Eclipse将对您发牢骚
//适用于Android 3.0+
public void openFileChooser（ValueCallback uploadMsg）{
mUploadMessage=上传消息；
意向i=新意向（意向.行动\u获取\u内容）；
i、 addCategory（意图。类别可打开）；
i、 setType（“image/*”）；
startActivityForResult（Intent.createChooser（i，“文件选择器”）、文件选择器\u结果代码）；
}
//适用于Android 3.0+
public void openFileChooser（ValueCallback uploadMsg，String acceptType）{
mUploadMessage=上传消息；
意向i=新意向（意向.行动\u获取\u内容）；
i、 addCategory（意图。类别可打开）；
i、 集合类型（“*/*”）；
startActivityForResult(
Intent.createChooser（i，“文件浏览器”），
文件选择器\u结果代码）；
}
//适用于Android 4.1
public void openFileChooser（ValueCallback uploadMsg、字符串接受类型、字符串捕获）{
mUploadMessage=上传消息；
意向i=新意向（意向.行动\u获取\u内容）；
i、 addCategory（意图。类别可打开）；
i、 setType（“image/*”）；
startActivityForResult（Intent.createChooser（i，“文件选择器”）、文件选择器\u结果代码）；
}
});
loadUrl（url）；
最终MyJavaScriptInterface MyJavaScriptInterface
=新的MyJavaScriptInterface（此）；
addJavascriptInterface（myJavaScriptInterface，“AndroidFunction”）；
}
@凌驾
public void onBackPressed（）{
//TODO自动生成的方法存根
if（webView.canGoBack（）==true）{
webView.goBack（）；
}否则{
super.onBackPressed（）；
}
}
公共类MyJavaScriptInterface{
语境；
MyJavaScriptInterface（上下文c）{
mContext=c；
}
@JavascriptInterface
公共空间展示土司（串土司）{
Toast.makeText（mContext，Toast，Toast.LENGTH_SHORT）.show（）；
//loadUrl（“javascript:document.getElementById（\“Button3\”）。innerHTML=\“bye\”；”）；
}
@JavascriptInterface
public void openAndroidDialog（）{
AlertDialog.builderMyDialog
=新建AlertDialog.Builder（BrowserScreen.this）；
myDialog.setTitle（“危险！”）；
setMessage（“你可以做你想做的事！”）；
myDialog.setPositiveButton（“开”，空）；
myDialog.show（）；
}
}
@凌驾
ActivityResult上受保护的void（int请求代码、int结果代码、，
意图（意图）{
if（请求代码=
implementation 'com.github.angads25:filepicker:1.1.1'
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.bivoiclient.utils.Constants;
import com.github.angads25.filepicker.controller.DialogSelectionListener;
import com.github.angads25.filepicker.model.DialogConfigs;
import com.github.angads25.filepicker.model.DialogProperties;
import com.github.angads25.filepicker.view.FilePickerDialog;
import java.io.File;
public class WebBrowserScreen extends Activity {
private WebView webView;
private ValueCallback<Uri[]> mUploadMessage;
private FilePickerDialog dialog;
private String LOG_TAG = "DREG";
private Uri[] results;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_complain);
webView = findViewById(R.id.webview);
WebSettings webSettings = webView.getSettings();
webSettings.setAppCacheEnabled(true);
webSettings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
webSettings.setJavaScriptEnabled(true);
webSettings.setLoadWithOverviewMode(true);
webSettings.setAllowFileAccess(true);
webView.setWebViewClient(new PQClient());
webView.setWebChromeClient(new PQChromeClient());
if (Build.VERSION.SDK_INT >= 19) {
webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
} else {
webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
webView.loadUrl(YOUR_WEBVIEW_URL);
}
private void openFileSelectionDialog() {
if (null != dialog && dialog.isShowing()) {
dialog.dismiss();
}
//Create a DialogProperties object.
final DialogProperties properties = new DialogProperties();
//Instantiate FilePickerDialog with Context and DialogProperties.
dialog = new FilePickerDialog(WebBrowserScreen.this, properties);
dialog.setTitle("Select a File");
dialog.setPositiveBtnName("Select");
dialog.setNegativeBtnName("Cancel");
properties.selection_mode = DialogConfigs.MULTI_MODE; // for multiple files
// properties.selection_mode = DialogConfigs.SINGLE_MODE; // for single file
properties.selection_type = DialogConfigs.FILE_SELECT;
//Method handle selected files.
dialog.setDialogSelectionListener(new DialogSelectionListener() {
@Override
public void onSelectedFilePaths(String[] files) {
results = new Uri[files.length];
for (int i = 0; i < files.length; i++) {
String filePath = new File(files[i]).getAbsolutePath();
if (!filePath.startsWith("file://")) {
filePath = "file://" + filePath;
}
results[i] = Uri.parse(filePath);
Log.d(LOG_TAG, "file path: " + filePath);
Log.d(LOG_TAG, "file uri: " + String.valueOf(results[i]));
}
mUploadMessage.onReceiveValue(results);
mUploadMessage = null;
}
});
dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialogInterface) {
if (null != mUploadMessage) {
if (null != results && results.length >= 1) {
mUploadMessage.onReceiveValue(results);
} else {
mUploadMessage.onReceiveValue(null);
}
}
mUploadMessage = null;
}
});
dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialogInterface) {
if (null != mUploadMessage) {
if (null != results && results.length >= 1) {
mUploadMessage.onReceiveValue(results);
} else {
mUploadMessage.onReceiveValue(null);
}
}
mUploadMessage = null;
}
});
dialog.show();
}
public class PQChromeClient extends WebChromeClient {
@Override
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
// Double check that we don't have any existing callbacks
if (mUploadMessage != null) {
mUploadMessage.onReceiveValue(null);
}
mUploadMessage = filePathCallback;
openFileSelectionDialog();
return true;
}
}
//Add this method to show Dialog when the required permission has been granted to the app.
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
switch (requestCode) {
case FilePickerDialog.EXTERNAL_READ_PERMISSION_GRANT: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (dialog != null) {
openFileSelectionDialog();
}
} else {
//Permission has not been granted. Notify the user.
Toast.makeText(WebBrowserScreen.this, "Permission is Required for getting list of files", Toast.LENGTH_SHORT).show();
}
}
}
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
// Check if the key event was the Back button and if there's history
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack();
return true;
}
// If it wasn't the Back key or there's no web page history, bubble up to the default
// system behavior (probably exit the activity)
return super.onKeyDown(keyCode, event);
}
public class PQClient extends WebViewClient {
ProgressBar progressDialog;
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// If url contains mailto link then open Mail Intent
if (url.contains("mailto:")) {
// Could be cleverer and use a regex
//Open links in new browser
view.getContext().startActivity(
new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
// Here we can open new activity
return true;
} else {
// Stay within this webview and load url
view.loadUrl(url);
return true;
}
}
// Show loader on url load
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// Then show progress Dialog
// in standard case YourActivity.this
if (progressDialog == null) {
progressDialog = findViewById(R.id.progressBar);
progressDialog.setVisibility(View.VISIBLE);
}
}
// Called when all page resources loaded
public void onPageFinished(WebView view, String url) {
webView.loadUrl("javascript:(function(){ " +
"document.getElementById('android-app').style.display='none';})()");
try {
// Close progressDialog
progressDialog.setVisibility(View.GONE);
} catch (Exception exception) {
exception.printStackTrace();
}
}
}
}
public class WebViewActivity extends AppCompatActivity {
ActivityWebviewBinding binding;
public static final int INPUT_FILE_REQUEST_CODE = 1;
private ProgressDialog progressDialog;
private ValueCallback<Uri[]> mFilePathCallback;
private String mCameraPhotoPath;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(this, R.layout.activity_webview);
setSupportActionBar(binding.toolbar);
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle(getString(R.string.button_register_now));
}
progressDialog = new ProgressDialog(WebViewActivity.this);
progressDialog.setMessage("Loading...");
progressDialog.show();
WebSettings webSettings = binding.webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setSupportZoom(true);
webSettings.setBuiltInZoomControls(true);
webSettings.setDisplayZoomControls(false);
webSettings.setAllowFileAccess(true);
webSettings.setLoadWithOverviewMode(true);
webSettings.setUseWideViewPort(true);
binding.webView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
final Uri uri = Uri.parse(url);
return handleUri(uri);
}
@TargetApi(Build.VERSION_CODES.N)
@Override
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
final Uri uri = request.getUrl();
return handleUri(uri);
}
private boolean handleUri(final Uri uri) {
if (uri != null) {
Log.i("TAG", "Uri =" + uri);
// Based on some condition you need to determine if you are going to load the url
// in your web view itself or in a browser.
// You can use `host` or `scheme` or any part of the `uri` to decide.
if (uri.getLastPathSegment() != null) {
if (uri.getLastPathSegment().contains("p1_business_part1.php")) {
finish();
startActivity(new Intent(WebViewActivity.this, LoginActivity.class));
return false;
}
} else {
binding.webView.loadUrl(uri.toString());
return true;
}
}
return false;
}
@Override
public void onPageFinished(WebView view, String url) {
if (progressDialog.isShowing()) {
progressDialog.dismiss();
}
}
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(WebViewActivity.this, "Error:" + description, Toast.LENGTH_SHORT).show();
view.loadUrl("about:blank");
}
});
binding.webView.setWebChromeClient(new WebChromeClient() {
public boolean onShowFileChooser(
WebView webView, ValueCallback<Uri[]> filePathCallback,
WebChromeClient.FileChooserParams fileChooserParams) {
if (mFilePathCallback != null) {
mFilePathCallback.onReceiveValue(null);
}
mFilePathCallback = filePathCallback;
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
takePictureIntent.putExtra("PhotoPath", mCameraPhotoPath);
} catch (IOException ex) {
// Error occurred while creating the File
Log.e("TAG", "Unable to create Image File", ex);
}
// Continue only if the File was successfully created
if (photoFile != null) {
mCameraPhotoPath = "file:" + photoFile.getAbsolutePath();
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
} else {
takePictureIntent = null;
}
}
Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
contentSelectionIntent.setType("image/*");
Intent[] intentArray;
if (takePictureIntent != null) {
intentArray = new Intent[]{takePictureIntent};
} else {
intentArray = new Intent[0];
}
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
startActivityForResult(chooserIntent, INPUT_FILE_REQUEST_CODE);
return true;
}
});
binding.webView.loadUrl("your_url");
}
/**
* More info this method can be found at
* http://developer.android.com/training/camera/photobasics.html
*
* @return
* @throws IOException
*/
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
return File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode != INPUT_FILE_REQUEST_CODE || mFilePathCallback == null) {
super.onActivityResult(requestCode, resultCode, data);
return;
}
Uri[] results = null;
// Check that the response is a good one
if (resultCode == Activity.RESULT_OK) {
if (data == null) {
// If there is not data, then we may have taken a photo
if (mCameraPhotoPath != null) {
results = new Uri[]{Uri.parse(mCameraPhotoPath)};
}
} else {
String dataString = data.getDataString();
if (dataString != null) {
results = new Uri[]{Uri.parse(dataString)};
}
}
}
mFilePathCallback.onReceiveValue(results);
mFilePathCallback = null;
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
if (binding.webView.canGoBack()) {
binding.webView.goBack();
} else {
super.onBackPressed();
}
}
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
finish();
return super.onOptionsItemSelected(item);
}
}