WebView Android Studio 中的文件上传

Posted 2023-05-07

【中文标题】WebView Android Studio 中的文件上传

【英文标题】：File Upload in WebView Android Studio

【发布时间】：2018-01-18 02:39:46

【问题描述】：

我想允许来自我的 WebView android 应用程序的上传按钮。由于我不是 Android 开发人员，因此我需要您的帮助才能为 Android WebView 启用图像上传器。这是我的 MainActivity 文件。

package com.hfzgk.hfzgk;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends AppCompatActivity 

    WebView myWeb;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setPage();
    

    private void setPage()

        myWeb = (WebView) findViewById(R.id.myViewId);
        WebSettings myseeting = myWeb.getSettings();
        myseeting.setjavascriptEnabled(true);
        myWeb.loadUrl("http://www.hfzgk.tk/");
        myWeb.setWebViewClient(new WebViewClient());
    

    @Override
    public void onBackPressed() 
        if (myWeb.canGoBack())
            myWeb.goBack();
        else
        super.onBackPressed();
    

【参考方案1】：

试试这个作为你的 mainactivity.java：

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 java.io.*;
import android.util.*;
import java.text.*;
import android.annotation.*;
import java.util.*;
import android.app.*;
import android.provider.*;
import android.os.*;
import android.webkit.*;

public class MainActivity extends Activity 

public static final int REQUEST_CODE_LOLIPOP = 1;
private final static int RESULT_CODE_ICE_CREAM = 2;
private WebView webView;
private ValueCallback<Uri[]> mFilePathCallback;
private String mCameraPhotoPath;
private ValueCallback<Uri> mUploadMessage;

private String url ="http://up.example.com";

@Override
protected void onCreate(Bundle savedInstanceState) 
super.onCreate(savedInstanceState);
setContentView(R.layout.main);


webView = (WebView) findViewById(R.id.wbvw);
setUpWebViewDefaults(webView);
webView.loadUrl(url);



   webView.setWebChromeClient(new WebChromeClient() 
        private String TAG;
        // 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"),
                                   RESULT_CODE_ICE_CREAM);

        
        // 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"),
                                   RESULT_CODE_ICE_CREAM);
        
        //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"),
                                   RESULT_CODE_ICE_CREAM);

        
        //For Android5.0+
        public boolean onShowFileChooser(
            WebView webView, ValueCallback<Uri[]> filePathCallback,
            FileChooserParams fileChooserParams) 
            if (mFilePathCallback != null) 
                mFilePathCallback.onReceiveValue(null);
            
            mFilePathCallback = filePathCallback;
            Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if (takePictureIntent.resolveActivity(MainActivity.this.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, REQUEST_CODE_LOLIPOP);

            return true;
        
       );
      
    private File createImageFile() throws IOException 
   // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = Environment.getExternalStoragePublicDirectory(
    Environment.DIRECTORY_PICTURES);
    File imageFile = File.createTempFile(
    imageFileName,  /* prefix */
    ".jpg",         /* suffix */
    storageDir      /* directory */
     );
   return imageFile;
    
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    private void setUpWebViewDefaults(WebView webView) 
    WebSettings settings = webView.getSettings();
   // Enable Javascript
    settings.setJavaScriptEnabled(true);
    // Use WideViewport and Zoom out if there is no viewport defined
   settings.setUseWideViewPort(true);
   settings.setLoadWithOverviewMode(true);
   // Enable pinch to zoom without the zoom buttons
   settings.setBuiltInZoomControls(true);
   if (Build.VERSION.SDK_INT > Build.VERSION_CODES.HONEYCOMB) 
    // Hide the zoom controls for HONEYCOMB+
    settings.setDisplayZoomControls(false);
   
   // Enable remote debugging via chrome://inspect
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) 
    WebView.setWebContentsDebuggingEnabled(true);
   
   // We set the WebViewClient to ensure links are consumed by the WebView rather
   // than passed to a browser if it can
   webView.setWebViewClient(new WebViewClient());
    
   @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) 
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode) 
    case RESULT_CODE_ICE_CREAM:
        Uri uri = null;
        if (data != null) 
            uri = data.getData();
        
        mUploadMessage.onReceiveValue(uri);
        mUploadMessage = null;
        break;
      case REQUEST_CODE_LOLIPOP:
        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;
        break;
      
      

      

在你的activitymain.xml中也添加这个：

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
tools:context=".MainActivity">



<WebView
android:id="@+id/webview"
android:layout_
android:layout_>


</WebView>


</RelativeLayout>

最后不要忘记在您的 manifest.xml 中授予权限：

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

  <application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    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>