Android-WebView支持input file启用相机/

2019-03-27  本文已影响0人  Maggieq8324

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

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