android 之 webView 显示h5 执行选择图片或者拍照功能

Posted 2020-08-06 知行IT讲堂

开发工具是 android studio SDK版本是 4.3
实现过程基本是这样
h5中调用手机选择文件图片的代码是：

<input accept="image/*" capture="camera" id="imgFile" name="imgFile"  type="file">

 

然后给webView 设置WebChromeClient WebChromeClient 主要处理解析，渲染网页等浏览器做的事情
设置完毕后 重写WebChromeClient 的openFileChooser方法即可实现h5调用手选择文体了。

h5中调用摄像头的代码是：
<input accept="image/*" capture="camera" id="imgFile" name="imgFile" type="file">

用安卓的 webView 控件来显示h5网页
然后给webView 设置WebChromeClient WebChromeClient 主要处理解析，渲染网页等浏览器做的事情
设置完毕后 重写WebChromeClient 的openFileChooser方法即可实现h5调用手机摄像头了。

但是这个方法的使用却不简单，这个方法是要调用webview的setWebChromeClient方法，然后重写一个WebChromeClient类。来到这一步，相信有点开发经验的同行都不难解决。问题的关键就在于，当你重写WebChromeClient这个类的时候会发现，根本就没有openFileChooser这个方法，那要怎么重写呢？是不是意味着这个方法其实行不通？于是再次翻查资料，发现原来这个方法居然是隐藏方法，并不不存在显性的继承重写关系。
最后，我发现要使用这个方法，还得自己继承WebChromeClient这个类把openFileChooser(ValueCallback<Uri> uploadFile)这个方法给写出来，代码如下：

 

activity_main01.xml 如下

 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

   <WebView
        android:id="@+id/webView01"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"/>

</RelativeLayout>

 

代码如下

 

package example.beisun.com.myapplication02;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ClipData;
import android.content.ComponentName;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Parcelable;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
/**
 * 可以选择文件且可以拍照
 */
@TargetApi(19)
@SuppressLint("NewApi")
public class MainActivity extends Activity {
    private WebView mWebView;
    //private String TMP_URL = "http://laodongjianguan.chanlytech.com:8088/laodongjianguan/index.php/daohang/daohang/f";
    private String TMP_URL = "http://cl.beisun.com/mbp/androdTest/index.html";
    //private String TMP_URL = "http://192.168.1.130:8080/cims-viewcapture/afrH5/toAuthDesc.do";
    private ValueCallback<Uri> mUploadMessage;// 表单的数据信息
    private ValueCallback<Uri[]> mUploadCallbackAboveL;
    private final static int FILECHOOSER_RESULTCODE = 1;// 表单的结果回调</span>
    private Uri imageUri;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main01);
        mWebView=(WebView) findViewById(R.id.webView01);
        mWebView.loadUrl(TMP_URL);
        mWebView.getSettings().setjavascriptEnabled(true);
        mWebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
        WebSettings settings = mWebView.getSettings();
        settings.setUseWideViewPort(true);
        settings.setLoadWithOverviewMode(true);
        settings.setJavaScriptEnabled(true);
        settings.setSupportZoom(true);
        mWebView.setWebViewClient(new WebViewClient(){
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                // TODO Auto-generated method stub
                return super.shouldOverrideUrlLoading(view, url);
            }

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

            @Override
            public boolean onShowFileChooser(WebView webView,
                                             ValueCallback<Uri[]> filePathCallback,
                                             FileChooserParams fileChooserParams) {
                mUploadCallbackAboveL=filePathCallback;
                take();
                return true;
            }


            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                mUploadMessage=uploadMsg;
                take();
            }
            public void openFileChooser(ValueCallback<Uri> uploadMsg,String acceptType) {
                mUploadMessage=uploadMsg;
                take();
            }
            public void openFileChooser(ValueCallback<Uri> uploadMsg,String acceptType, String capture) {
                mUploadMessage=uploadMsg;
                take();
            }
        });

    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode==FILECHOOSER_RESULTCODE)
        {
            if (null == mUploadMessage && null == mUploadCallbackAboveL) return;
            Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
            if (mUploadCallbackAboveL != null) {
                onActivityResultAboveL(requestCode, resultCode, data);
            }
            else  if (mUploadMessage != null) {

                if (result != null) {
                    String path = getPath(getApplicationContext(),
                            result);
                    Uri uri = Uri.fromFile(new File(path));
                    mUploadMessage
                            .onReceiveValue(uri);
                } else {
                    mUploadMessage.onReceiveValue(imageUri);
                }
                mUploadMessage = null;



            }
        }
    }



    @SuppressWarnings("null")
    @TargetApi(Build.VERSION_CODES.BASE)
    private void onActivityResultAboveL(int requestCode, int resultCode, Intent data) {
        if (requestCode != FILECHOOSER_RESULTCODE
                || mUploadCallbackAboveL == null) {
            return;
        }

        Uri[] results = null;

        if (resultCode == Activity.RESULT_OK) {

            if (data == null) {

                results = new Uri[]{imageUri};
            } else {
                String dataString = data.getDataString();
                ClipData clipData = data.getClipData();

                if (clipData != null) {
                    results = new Uri[clipData.getItemCount()];
                    for (int i = 0; i < clipData.getItemCount(); i++) {
                        ClipData.Item item = clipData.getItemAt(i);
                        results[i] = item.getUri();
                    }
                }

                if (dataString != null)
                    results = new Uri[]{Uri.parse(dataString)};
            }
        }
        if(results!=null){
            mUploadCallbackAboveL.onReceiveValue(results);
            mUploadCallbackAboveL = null;
        }else{
            results = new Uri[]{imageUri};
            mUploadCallbackAboveL.onReceiveValue(results);
            mUploadCallbackAboveL = null;
        }

        return;
    }



    private void take(){
        File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MyApp");
        // Create the storage directory if it does not exist
        if (! imageStorageDir.exists()){
            imageStorageDir.mkdirs();
        }
        File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
        imageUri = Uri.fromFile(file);

        final List<Intent> cameraIntents = new ArrayList<Intent>();
        final Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        final PackageManager packageManager = getPackageManager();
        final List<ResolveInfo> listCam = packageManager.queryIntentActivities(captureIntent, 0);
        for(ResolveInfo res : listCam) {
            final String packageName = res.activityInfo.packageName;
            final Intent i = new Intent(captureIntent);
            i.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
            i.setPackage(packageName);
            i.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            cameraIntents.add(i);

        }
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("image/*");
        Intent chooserIntent = Intent.createChooser(i,"Image Chooser");
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[]{}));
        MainActivity.this.startActivityForResult(chooserIntent,  FILECHOOSER_RESULTCODE);
    }

    @SuppressLint("NewApi")
    @TargetApi(Build.VERSION_CODES.KITKAT)
    public static String getPath(final Context context, final Uri uri) {
        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }

                // TODO handle non-primary volumes
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {

                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

                return getDataColumn(context, contentUri, null, null);
            }
            // MediaProvider
            else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }

                final String selection = "_id=?";
                final String[] selectionArgs = new String[]{split[1]};

                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        }
        // MediaStore (and general)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {
            return getDataColumn(context, uri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }

        return null;
    }


    /**
     * Get the value of the data column for this Uri. This is useful for
     * MediaStore Uris, and other file-based ContentProviders.
     *
     * @param context       The context.
     * @param uri           The Uri to query.
     * @param selection     (Optional) Filter used in the query.
     * @param selectionArgs (Optional) Selection arguments used in the query.
     * @return The value of the _data column, which is typically a file path.
     */
    public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {column};

        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                final int column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } finally {
            if (cursor != null) cursor.close();
        }
        return null;
    }


    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }


    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }


    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

}