美文网首页
Android-WebView支持input file启用相机/

Android-WebView支持input file启用相机/

作者: Maggieq8324 | 来源:发表于2019-03-27 17:17 被阅读0次

    webview要调起input-file拍照或者选取文件功能,可以在webview.setWebChromeClient方法中重写指定的方法,来拦截webview的input事件,并做我们相应的操作。

    Android代码

    webView.setWebChromeClient(new WebChromeClient() {
                @Override
                public void onProgressChanged(WebView view, int newProgress) {
                    if (newProgress == 100) {
                        progressBar.setVisibility(View.GONE);//加载完网页进度条消失
                    } else {
                        progressBar.setProgress(newProgress);//设置进度值
                        progressBar.setVisibility(View.VISIBLE);//开始加载网页时显示进度条
                    }
                }
     
                /**
                 * 8(Android 2.2) <= API <= 10(Android 2.3)回调此方法
                 */
                private void openFileChooser(android.webkit.ValueCallback<Uri> uploadMsg) {
                    Log.e("WangJ", "运行方法 openFileChooser-1");
                    // (2)该方法回调时说明版本API < 21,此时将结果赋值给 mUploadCallbackBelow,使之 != null
                    mUploadCallbackBelow = uploadMsg;
                    takePhoto();
                }
     
                /**
                 * 11(Android 3.0) <= API <= 15(Android 4.0.3)回调此方法
                 */
                public void openFileChooser(android.webkit.ValueCallback<Uri> uploadMsg, String acceptType) {
                    Log.e("WangJ", "运行方法 openFileChooser-2 (acceptType: " + acceptType + ")");
                    // 这里我们就不区分input的参数了,直接用拍照
                    openFileChooser(uploadMsg);
                }
     
                /**
                 * 16(Android 4.1.2) <= API <= 20(Android 4.4W.2)回调此方法
                 */
                public void openFileChooser(android.webkit.ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                    Log.e("WangJ", "运行方法 openFileChooser-3 (acceptType: " + acceptType + "; capture: " + capture + ")");
                    // 这里我们就不区分input的参数了,直接用拍照
                    openFileChooser(uploadMsg);
                }
     
                /**
                 * API >= 21(Android 5.0.1)回调此方法
                 */
                @Override
                public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> valueCallback, FileChooserParams fileChooserParams) {
                    Log.e("WangJ", "运行方法 onShowFileChooser");
                    // (1)该方法回调时说明版本API >= 21,此时将结果赋值给 mUploadCallbackAboveL,使之 != null
                    mUploadCallbackAboveL = valueCallback;
                    takePhoto();
                    return true;
                }
            });
    

    这里的java代码是来拦截input事件的,里面做了很多api版本的判断,不同版本的api调用不同的方法,下面是一些其他方法:

    调起相机/选择文件的方法:takePhoto();

     /**
         * 调用相机
         */
        private void takePhoto() {
            // 指定拍照存储位置的方式调起相机
            String filePath = Environment.getExternalStorageDirectory() + File.separator
                    + Environment.DIRECTORY_PICTURES + File.separator;
            String fileName = "IMG_" + DateFormat.format("yyyyMMdd_hhmmss", Calendar.getInstance(Locale.CHINA)) + ".jpg";
            imageUri = Uri.fromFile(new File(filePath + fileName));
     
    //        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    //        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    //        startActivityForResult(intent, REQUEST_CODE);
     
            // 选择图片(不包括相机拍照),则不用成功后发刷新图库的广播
    //        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
    //        i.addCategory(Intent.CATEGORY_OPENABLE);
    //        i.setType("image/*");
    //        startActivityForResult(Intent.createChooser(i, "Image Chooser"), REQUEST_CODE);
     
            Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
     
            Intent Photo = new Intent(Intent.ACTION_PICK,
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
     
            Intent chooserIntent = Intent.createChooser(Photo, "Image Chooser");
            chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]{captureIntent});
     
            startActivityForResult(chooserIntent, REQUEST_CODE);
        }
    

    onActivityResult回调:

    @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            if (requestCode == REQUEST_CODE) {
                // 经过上边(1)、(2)两个赋值操作,此处即可根据其值是否为空来决定采用哪种处理方法
                if (mUploadCallbackBelow != null) {
                    chooseBelow(resultCode, data);
                } else if (mUploadCallbackAboveL != null) {
                    chooseAbove(resultCode, data);
                } else {
                    Toast.makeText(this, "发生错误", Toast.LENGTH_SHORT).show();
                }
            }
        }
    

    其他一些方法:

    /**
         * Android API < 21(Android 5.0)版本的回调处理
         * @param resultCode 选取文件或拍照的返回码
         * @param data 选取文件或拍照的返回结果
         */
        private void chooseBelow(int resultCode, Intent data) {
            Log.e("WangJ", "返回调用方法--chooseBelow");
     
            if (RESULT_OK == resultCode) {
                updatePhotos();
     
                if (data != null) {
                    // 这里是针对文件路径处理
                    Uri uri = data.getData();
                    if (uri != null) {
                        Log.e("WangJ", "系统返回URI:" + uri.toString());
                        mUploadCallbackBelow.onReceiveValue(uri);
                    } else {
                        mUploadCallbackBelow.onReceiveValue(null);
                    }
                } else {
                    // 以指定图像存储路径的方式调起相机,成功后返回data为空
                    Log.e("WangJ", "自定义结果:" + imageUri.toString());
                    mUploadCallbackBelow.onReceiveValue(imageUri);
                }
            } else {
                mUploadCallbackBelow.onReceiveValue(null);
            }
            mUploadCallbackBelow = null;
        }
     
        /**
         * Android API >= 21(Android 5.0) 版本的回调处理
         * @param resultCode 选取文件或拍照的返回码
         * @param data 选取文件或拍照的返回结果
         */
        private void chooseAbove(int resultCode, Intent data) {
            Log.e("WangJ", "返回调用方法--chooseAbove");
     
            if (RESULT_OK == resultCode) {
                updatePhotos();
     
                if (data != null) {
                    // 这里是针对从文件中选图片的处理
                    Uri[] results;
                    Uri uriData = data.getData();
                    if (uriData != null) {
                        results = new Uri[]{uriData};
                        for (Uri uri : results) {
                            Log.e("WangJ", "系统返回URI:" + uri.toString());
                        }
                        mUploadCallbackAboveL.onReceiveValue(results);
                    } else {
                        mUploadCallbackAboveL.onReceiveValue(null);
                    }
                } else {
                    Log.e("WangJ", "自定义结果:" + imageUri.toString());
                    mUploadCallbackAboveL.onReceiveValue(new Uri[]{imageUri});
                }
            } else {
                mUploadCallbackAboveL.onReceiveValue(null);
            }
            mUploadCallbackAboveL = null;
        }
     
        private void updatePhotos() {
            // 该广播即使多发(即选取照片成功时也发送)也没有关系,只是唤醒系统刷新媒体文件
            Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
            intent.setData(imageUri);
            sendBroadcast(intent);
        }
    

    相关的全局变量:

    private android.webkit.ValueCallback<Uri[]> mUploadCallbackAboveL;
    private android.webkit.ValueCallback<Uri> mUploadCallbackBelow;
    private Uri imageUri;
    private int REQUEST_CODE = 1234;
    

    原文:https://blog.csdn.net/qq_35373333/article/details/79565629

    相关文章

      网友评论

          本文标题:Android-WebView支持input file启用相机/

          本文链接:https://www.haomeiwen.com/subject/xjctbqtx.html