java - 如何在 Android Lollipop 中使用 WebView 上传文件？

Question

我是 Android 新手，我开发了一个 webView 应用程序，我有一个文件选择器按钮，但它在 Lollipop 中不起作用。我在 MI5 marshmallow 中安装了 apk，没有任何响应

这是代码，请帮助我在 webview 上需要包含文件上传启用选项

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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="0dp"
    android:paddingLeft="0dp"
    android:paddingRight="0dp"
    android:paddingTop="0dp"
    tools:context="com.example.tamil.stagingsite.MainActivity">

    <ProgressBar
        android:id="@+id/progressBar"
        style="@android:style/Widget.Material.Light.ProgressBar.Large"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true" />

    <WebView
        android:id="@+id/activity_main_webview"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:animationCache="true"
        android:background="@android:color/white">

    </WebView>
</RelativeLayout>

MainActivity.java

package com.example.tamil.stagingsite;

import android.app.Activity;
import android.graphics.Bitmap;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;

import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.appindexing.Thing;
import com.google.android.gms.common.api.GoogleApiClient;

public class MainActivity extends Activity {


    private WebView mWebView;
    /**
     * ATTENTION: This was auto-generated to implement the App Indexing API.
     * See https://g.co/AppIndexing/AndroidStudio for more information.
     */
    private GoogleApiClient client;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);

        mWebView = (WebView) findViewById(R.id.activity_main_webview);

        WebSettings webSettings = mWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        mWebView.loadUrl("http://census-staging.herokuapp.com/");
        mWebView.setWebViewClient(new WebViewClient());
        mWebView.setWebViewClient(new MyAppWebViewClient());

        // ATTENTION: This was auto-generated to implement the App Indexing API.
        // See https://g.co/AppIndexing/AndroidStudio for more information.
        client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
    }


    @Override
    public void onBackPressed() {
        if (mWebView.canGoBack()) {
            mWebView.goBack();
        } else {
            super.onBackPressed();
        }
    }


    /**
     * ATTENTION: This was auto-generated to implement the App Indexing API.
     * See https://g.co/AppIndexing/AndroidStudio for more information.
     */
    public Action getIndexApiAction() {
        Thing object = new Thing.Builder()
                .setName("Main Page") // TODO: Define a title for the content shown.
                // TODO: Make sure this auto-generated URL is correct.
                .setUrl(Uri.parse("http:staging.herokuapp.com/"))
                .build();
        return new Action.Builder(Action.TYPE_VIEW)
                .setObject(object)
                .setActionStatus(Action.STATUS_TYPE_COMPLETED)
                .build();
    }

    @Override
    public void onStart() {
        super.onStart();

        // ATTENTION: This was auto-generated to implement the App Indexing API.
        // See https://g.co/AppIndexing/AndroidStudio for more information.
        client.connect();
        AppIndex.AppIndexApi.start(client, getIndexApiAction());
    }

    @Override
    public void onStop() {
        super.onStop();

        // ATTENTION: This was auto-generated to implement the App Indexing API.
        // See https://g.co/AppIndexing/AndroidStudio for more information.
        AppIndex.AppIndexApi.end(client, getIndexApiAction());
        client.disconnect();
    }
}

Answer 1

在 setwebchormeclinet 中使用此代码。像这样

  webView.setWebChromeClient(new WebChromeClient() {

        // openFileChooser for Android 3.0+
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType){  

            // Update message
            mUploadMessage = uploadMsg;

            try{    

                // Create AndroidExampleFolder at sdcard

                File imageStorageDir = new File(
                                       Environment.getExternalStoragePublicDirectory(
                                       Environment.DIRECTORY_PICTURES)
                                       , "AndroidExampleFolder");

                if (!imageStorageDir.exists()) {
                    // Create AndroidExampleFolder at sdcard
                    imageStorageDir.mkdirs();
                }

                // Create camera captured image file path and name 
                File file = new File(
                                imageStorageDir + File.separator + "IMG_"
                                + String.valueOf(System.currentTimeMillis()) 
                                + ".jpg");

                mCapturedImageURI = Uri.fromFile(file); 

                // Camera capture image intent
                final Intent captureIntent = new Intent(
                                              android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

                captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);

                Intent i = new Intent(Intent.ACTION_GET_CONTENT); 
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("image/*");

                // Create file chooser intent
                Intent chooserIntent = Intent.createChooser(i, "Image Chooser");

                // Set camera intent to file chooser 
                chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS
                                       , new Parcelable[] { captureIntent });

                // On select image call onActivityResult method of activity
                startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);

              }
             catch(Exception e){
                 Toast.makeText(getBaseContext(), "Exception:"+e, 
                            Toast.LENGTH_LONG).show();
             }

        }

        // openFileChooser for Android < 3.0
        public void openFileChooser(ValueCallback<Uri> uploadMsg){
            openFileChooser(uploadMsg, "");
        }

        //openFileChooser for other Android versions
        public void openFileChooser(ValueCallback<Uri> uploadMsg, 
                                   String acceptType, 
                                   String capture) {

            openFileChooser(uploadMsg, acceptType);
        }

引用链接是here