下午好，我有一个Webview，我每次尝试登录时都尝试使我的网站的Facebook登录正常工作，由于某种原因而无法重新加载和重新注册，我该怎么办？在Chrome浏览器中正常工作。
我正在使用以下代码：
MainActivity.java：
package com.inf.os.fileup;
import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
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.Toast;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class MainActivity extends AppCompatActivity{
WebView webView;
private static final String TAG = MainActivity.class.getSimpleName();
private String mCM;
private ValueCallback<Uri> mUM;
private ValueCallback<Uri[]> mUMA;
private final static int FCR=1;
//select whether you want to upload multiple files (set 'true' for yes)
private boolean multiple_files = false;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent){
super.onActivityResult(requestCode, resultCode, intent);
if(Build.VERSION.SDK_INT >= 21){
Uri[] results = null;
//checking if response is positive
if(resultCode== Activity.RESULT_OK){
if(requestCode == FCR){
if(null == mUMA){
return;
}
if(intent == null || intent.getData() == null){
if(mCM != null){
results = new Uri[]{Uri.parse(mCM)};
}
}else{
String dataString = intent.getDataString();
if(dataString != null){
results = new Uri[]{Uri.parse(dataString)};
} else {
if(multiple_files) {
if (intent.getClipData() != null) {
final int numSelectedFiles = intent.getClipData().getItemCount();
results = new Uri[numSelectedFiles];
for (int i = 0; i < numSelectedFiles; i++) {
results[i] = intent.getClipData().getItemAt(i).getUri();
}
}
}
}
}
}
}
mUMA.onReceiveValue(results);
mUMA = null;
}else{
if(requestCode == FCR){
if(null == mUM) return;
Uri result = intent == null || resultCode != RESULT_OK ? null : intent.getData();
mUM.onReceiveValue(result);
mUM = null;
}
}
}
@SuppressLint({"SetJavaScriptEnabled", "WrongViewCast"})
@SuppressWarnings({"findViewById", "RedundantCast"})
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.ifView);
assert webView != null;
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowFileAccess(true);
webSettings.setDomStorageEnabled(true);
if(Build.VERSION.SDK_INT >= 21){
webSettings.setMixedContentMode(0);
webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
}else if(Build.VERSION.SDK_INT >= 19){
webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
}else {
webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
webView.setWebViewClient(new Callback());
webView.loadUrl("https://www.sitemercado.com.br/frade/"); //add your test web/page address here
webView.setWebChromeClient(new WebChromeClient() {
/*
* openFileChooser is not a public Android API and has never been part of the SDK.
*/
//handling input[type="file"] requests for android API 16+
@SuppressLint("ObsoleteSdkInt")
@SuppressWarnings("unused")
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
mUM = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("*/*");
if (multiple_files && Build.VERSION.SDK_INT >= 18) {
i.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
}
startActivityForResult(Intent.createChooser(i, "File Chooser"), FCR);
}
//handling input[type="file"] requests for android API 21+
@SuppressLint("InlinedApi")
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
if (file_permission()) {
String[] perms = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.CAMERA};
//checking for storage permission to write images for upload
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, perms, FCR);
//checking for WRITE_EXTERNAL_STORAGE permission
} else if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, FCR);
//checking for CAMERA permissions
} else if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, FCR);
}
if (mUMA != null) {
mUMA.onReceiveValue(null);
}
mUMA = filePathCallback;
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(MainActivity.this.getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = createImageFile();
takePictureIntent.putExtra("PhotoPath", mCM);
} catch (IOException ex) {
Log.e(TAG, "Image file creation failed", ex);
}
if (photoFile != null) {
mCM = "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("*/*");
if (multiple_files) {
contentSelectionIntent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
}
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, "File Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
startActivityForResult(chooserIntent, FCR);
return true;
}else{
return false;
}
}
});
}
//callback reporting if error occurs
public class Callback extends WebViewClient{
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl){
Toast.makeText(getApplicationContext(), "Failed loading app!", Toast.LENGTH_SHORT).show();
}
}
public boolean file_permission(){
if(Build.VERSION.SDK_INT >=23 && (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA}, 1);
return false;
}else{
return true;
}
}
//creating new image file here
private File createImageFile() throws IOException{
@SuppressLint("SimpleDateFormat") String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "img_"+timeStamp+"_";
File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
return File.createTempFile(imageFileName,".jpg",storageDir);
}
//back/down key handling
@Override
public boolean onKeyDown(int keyCode, @NonNull KeyEvent event){
if(event.getAction() == KeyEvent.ACTION_DOWN){
switch(keyCode){
case KeyEvent.KEYCODE_BACK:
if(webView.canGoBack()){
webView.goBack();
}else{
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
@Override
public void onConfigurationChanged(Configuration newConfig){
super.onConfigurationChanged(newConfig);
}
}
activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity">
<WebView
android:id="@+id/ifView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
我试图在网站和google上搜索一些解决方案，但是即使如此我还是无法使它起作用，我知道它已经在其他Webview应用程序中看到了，您能给我个启发吗？