Android中的Webview文件上传问题

Question

我正在使用谷歌搜索中找到的代码在android studio webview中上传文件。

我有两个问题。

1）在Android版本4.4.2中，点击文件上传按钮会触发文件选择器，但app会自动关闭。

2）在android 5.0.2中，它会触发文件选择器对话框，但在选择文件后，它仍显示为没有文件选择。

我在这里做错了什么..

这是MainActivity.Java

package example.filenewupload;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.Parcelable;
import android.provider.MediaStore;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
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 java.io.File;



@SuppressLint("SetJavaScriptEnabled") public class MainActivity extends ActionBarActivity {


    WebView webView;
    ProgressBar progressBar;


    private ValueCallback<Uri> mUploadMessage;
    private final static int FILECHOOSER_RESULTCODE=1;
    protected static final int INPUT_FILE_REQUEST_CODE = 0;

    @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;
        }
    }



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        WebView webView = (WebView) findViewById(R.id.browser);
        progressBar = (ProgressBar) findViewById(R.id.progressbar);
        webView.setWebViewClient(new myWebClient());
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setAllowFileAccess(true);
        webView.getSettings().setDomStorageEnabled(true);
        webView.getSettings().setSupportMultipleWindows(true);
        webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        webView.getSettings().setUseWideViewPort(true);
        webView.loadUrl("file:///android_asset/browse.html");
        webView.setWebChromeClient(new WebChromeClient()
        {
            //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("*/*");
                MainActivity.this.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("*/*");
                MainActivity.this.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("*/*");
                MainActivity.this.startActivityForResult( Intent.createChooser( i, "File Chooser" ),
                        MainActivity.FILECHOOSER_RESULTCODE );
                Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
                startActivityForResult(chooserIntent, INPUT_FILE_REQUEST_CODE);

            }

            @Override
            public boolean onShowFileChooser(WebView webView,
                                             ValueCallback<Uri[]> filePathCallback,
                                             FileChooserParams fileChooserParams) {
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("*/*");
                MainActivity.this.startActivityForResult( Intent.createChooser( i, "File Browser" ),
                        MainActivity.FILECHOOSER_RESULTCODE );
                i.putExtra(Intent.EXTRA_INTENT, i);
                i.putExtra(Intent.EXTRA_TITLE, "File Browser");
                i.putExtra(Intent.EXTRA_INITIAL_INTENTS, i);



                // TODO Auto-generated method stub
                return true;
            }
        });


    }


    public class myWebClient extends WebViewClient
    {
        @Override
        public void onPageFinished(WebView view, String url) {
            // TODO Auto-generated method stub
            super.onPageFinished(view, url);
            progressBar.setVisibility(View.GONE);
        }

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            // TODO Auto-generated method stub
            super.onPageStarted(view, url, favicon);
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            // TODO Auto-generated method stub
            return super.shouldOverrideUrlLoading(view, url);
        }

    }



    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event)  {
        // TODO Auto-generated method stub

        return super.onKeyDown(keyCode, event);
    }


}

的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="dptechnologysolutions.filenewupload">
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_INPUT_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>