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,"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;
总结
以上所述是小编给大家介绍的Android WebView支持input file启用相机/选取照片功能,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对我们网站的支持!
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