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让人闹心的H5(Android与H5交互)

让人闹心的H5(Android与H5交互)

作者: mt大山 | 来源:发表于2018-11-12 15:55 被阅读0次

    Android在开发过程中避免不了会与H5进行交互。在开发过程中有一个需要在H5中调用相机和相册来选取相片的功能,所以在此记录一下。

    我的项目中使用的是腾讯的X5内核,链接如下:
    腾讯X5内核

    先来一个Android与Html交互的小栗子
    先在main文件下创建Directory取名assets


    image.png

    html代码:

    <!DOCTYPE html>
    <html>
    <head>
    </head>
    
    <body>
    <input type="text" id="tv">
    <input type="button" id="btn" onclick="giveAndroid()" value="给安卓发数据啦">
    <script type="text/javascript">
    
    function showAndroid(msg){
        alert(msg);
    }
    
    function giveAndroid(){
    var msg = document.getElementById("tv").value;
    Android.show(msg);
    }
    </script>
    </body>
    </html>
    
    

    Activity的代码

      WebSettings webSettings = web.getSettings();
            webSettings.setUseWideViewPort(true);
            webSettings.setLoadWithOverviewMode(true);
            webSettings.setDomStorageEnabled(true);
            webSettings.setDefaultTextEncodingName("UTF-8");
            webSettings.setAllowContentAccess(true); // 是否可访问Content Provider的资源,默认值 true
            webSettings.setAllowFileAccess(true);    // 是否可访问本地文件,默认值 true
            //开启JavaScript支持
            webSettings.setJavaScriptEnabled(true);
            // 支持缩放
            webSettings.setSupportZoom(true);
            web.setWebViewClient(new WebViewClient());
            web.setWebChromeClient(new WebChromeClient());
            web.loadUrl("file:///android_asset/test.html");
            web.addJavascriptInterface(TwoActivity.this,"Android");
        }
        //一定要加 方法名字必须是public的
        @JavascriptInterface
        public void show(String msg){
            Toast.makeText(this,msg,Toast.LENGTH_SHORT).show();
        };
        @OnClick(R.id.btn)
        public void onViewClicked() {
            web.loadUrl("javascript:showAndroid('"+edit.getText().toString()+"');");
        }
    

    Activity的布局文件

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <EditText
            android:id="@+id/edit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@+id/btn" />
    
        <Button
            android:id="@+id/btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="给html发数据" />
    
        <WebView
            android:id="@+id/web"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/btn"></WebView>
    </RelativeLayout>
    

    上我自己要做的需求

    1、新建一个xml


    image.png

    2、在Activity应用

    @ContentView(R.layout.activity_rights_and_interests_aty)
    public class RightsAndInterestsAty extends BActivity {
    
        @ViewInject(R.id.web)
        private WebView webView;
    
        @ViewInject(R.id.progressBar1)
        private ProgressBar progressBar1;
    
        private ValueCallback<Uri> mUploadMessage;
        private ValueCallback<Uri[]> mUploadCallbackAboveL;
    
        private final static int FILECHOOSER_RESULTCODE = 1;
    
    
        private Dialog dialog;
        private View view;
    
        @Override
        protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            if (resultCode == RESULT_CANCELED) {
                onshowPopAgain();
                return;
            }
            if (requestCode == FILECHOOSER_RESULTCODE) {
                if (null == mUploadMessage && null == mUploadCallbackAboveL) return;
                if (data == null) {
                    Uri result = Uri.fromFile(fileUri);
                    if (mUploadCallbackAboveL != null) {
                        onActivityResultAboveL(requestCode, resultCode, data);
                    } else if (mUploadMessage != null) {
                        mUploadMessage.onReceiveValue(result);
                        mUploadMessage = null;
                    }
                } else {
                    Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
                    if (mUploadCallbackAboveL != null) {
                        onActivityResultAboveL(requestCode, resultCode, data);
                    } else if (mUploadMessage != null) {
                        mUploadMessage.onReceiveValue(result);
                        mUploadMessage = null;
                    }
                }
    
            }
        }
    
        @TargetApi(Build.VERSION_CODES.LOLLIPOP)
        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)};
                }
            }
            mUploadCallbackAboveL.onReceiveValue(results);
            mUploadCallbackAboveL = null;
            return;
        }
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            mActionBar.hide();
            WebSettings webSettings = this.webView.getSettings();
            //将图片调整到适合webView大小
            webSettings.setUseWideViewPort(true);
            // 缩放至屏幕的大小
            webSettings.setLoadWithOverviewMode(true);
            // 设置DOM Storage缓存
            webSettings.setDomStorageEnabled(true);
            //设置编码格式
            webSettings.setDefaultTextEncodingName("UTF-8");
            // 是否可访问Content Provider的资源,默认值 true
            webSettings.setAllowContentAccess(true);
            // 是否可访问本地文件,默认值 true
            webSettings.setAllowFileAccess(true);
            //开启JavaScript支持
            webSettings.setJavaScriptEnabled(true);
            //支持缩放,默认为true。
            webSettings.setSupportZoom(true);
            // 设置webview无缓存
            webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
            //图片不显示
            webSettings.setBlockNetworkImage(false);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                webSettings.setMixedContentMode(0);
            }
    
    
            webView.setWebViewClient(new WebViewClient() {
                //加载完成调用
                @Override
                public void onPageFinished(WebView view, String url) {
                    super.onPageFinished(view, url);
                }
    
                //开始加载调用
                @Override
                public void onPageStarted(WebView view, String url, Bitmap favicon) {
                    super.onPageStarted(view, url, favicon);
                }
            });
    
            webView.loadUrl("url");
    
            webView.setWebChromeClient(new WebChromeClient() {
                @Override
                public void onProgressChanged(WebView view, int newProgress) {
                    if (newProgress == 100) {
                        progressBar1.setVisibility(View.GONE);//加载完网页进度条消失
                    } else {
                        progressBar1.setVisibility(View.VISIBLE);//开始加载网页时显示进度条
                        progressBar1.setProgress(newProgress);//设置进度值
                    }
                }
    
                //当js的input的type属性,属性值为file时
                // For Android 3.0+
                public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                    mUploadMessage = uploadMsg;
                    show();
                }
    
                // For Android 3.0+
                public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
                    mUploadMessage = uploadMsg;
                    show();
                }
    
                //For Android 4.1
                public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                    mUploadMessage = uploadMsg;
                    show();
                }
    
                // For Android 5.0+
                public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
                    show();
                    mUploadCallbackAboveL = filePathCallback;
                    return true;
                }
            });
        }
    
        public static final String BASE_PATH = Environment.getExternalStorageDirectory().getPath() + File.separator + "kefuimg/";
        private File fileUri = null;
        private Uri imageUri;
    
        /**
         * 拍照
         */
        private void takePhoto() {
            fileUri = new File(BASE_PATH, System.currentTimeMillis() + ".jpg");
            if (!fileUri.getParentFile().exists()) {
                fileUri.getParentFile().mkdirs();
            } else {
                deleteAllFiles(new File(BASE_PATH));
            }
            imageUri = Uri.fromFile(fileUri);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                imageUri = FileProvider.getUriForFile(RightsAndInterestsAty.this, getPackageName() + ".fileprovider", fileUri);//通过FileProvider创建一个content类型的Uri
            }
            PhotoUtils.takePicture(RightsAndInterestsAty.this, imageUri, FILECHOOSER_RESULTCODE);
        }
    
        private void deleteAllFiles(File root) {
            File files[] = root.listFiles();
            if (files != null)
                for (File f : files) {
                    if (f.isDirectory()) { // 判断是否为文件夹
                        deleteAllFiles(f);
                        try {
                            f.delete();
                        } catch (Exception e) {
                        }
                    } else {
                        if (f.exists()) { // 判断是否存在
                            deleteAllFiles(f);
                            try {
                                f.delete();
                            } catch (Exception e) {
                            }
                        }
                    }
                }
        }
    
        private void getPhoto() {
            fileUri = new File(BASE_PATH, System.currentTimeMillis() + ".jpg");
            if (!fileUri.getParentFile().exists()) {
                fileUri.getParentFile().mkdirs();
            }
            imageUri = Uri.fromFile(fileUri);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                imageUri = FileProvider.getUriForFile(RightsAndInterestsAty.this, getPackageName() + ".fileprovider", fileUri);//通过FileProvider创建一个content类型的Uri
            }
            PhotoUtils.openPic(this, FILECHOOSER_RESULTCODE);
        }
    
        public void show() {
            dialog = new Dialog(this, R.style.ActionSheetDialogStyle);
            //填充对话框的布局
            view = LayoutInflater.from(this).inflate(R.layout.head_popupwindows, null);
            TextView bt1 = view.findViewById(R.id.item_popupwindows_camera);
            TextView bt2 = view
                    .findViewById(R.id.item_popupwindows_Photo);
            TextView bt3 = view
                    .findViewById(R.id.item_popupwindows_cancel);
            bt1.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                    takePhoto();
                }
            });
            bt2.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    dialog.dismiss();
                    getPhoto();
                }
            });
            bt3.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    dialog.dismiss();
                    onshowPopAgain();
                }
            });
            //初始化控件
            //将布局设置给Dialog
            dialog.setContentView(view);
            dialog.setCanceledOnTouchOutside(false);
            //获取当前Activity所在的窗体
            Window dialogWindow = dialog.getWindow();
            //设置Dialog从窗体底部弹出
            dialogWindow.setGravity(Gravity.BOTTOM);
            dialogWindow.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            //获得窗体的属性
            WindowManager.LayoutParams lp = dialogWindow.getAttributes();
    //       将属性设置给窗体
            dialogWindow.setAttributes(lp);
            dialog.show();//显示对话框
            dialog.setOnKeyListener(new DialogInterface.OnKeyListener() {
                @Override
                public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
                    if (keyCode == KeyEvent.KEYCODE_BACK) {
                        onshowPopAgain();
                    }
                    return false;
                }
            });
        }
    
        //解决点击按钮一次时 在此点击失效问题
        private void onshowPopAgain() {
            if (mUploadCallbackAboveL != null) {
                mUploadCallbackAboveL.onReceiveValue(null);
                mUploadCallbackAboveL = null;
                return;
            }
            if (mUploadMessage != null) {
                mUploadMessage.onReceiveValue(null);
                mUploadMessage = null;
                return;
            }
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            if (webView != null) {
                webView.setWebViewClient(null);
                webView.setWebChromeClient(null);
                webView.loadDataWithBaseURL(null, "", "text/html", "utf-8", null);
                webView.clearHistory();
                webView.destroy();
                webView = null;
            }
        }
    
        @Override
        public boolean onKeyDown(int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {
                if (webView.canGoBack()) {
                
                        webView.goBack();
                    }
                } else {
                    finish();
                }
            }
            return true;
        }
    }
    

    说明

    WebViewClient就是帮助WebView处理各种通知、请求事件的,具体来说包括:
    onLoadResource
    onPageStart
    onPageFinish
    onReceiveError
    onReceivedHttpAuthRequest

    WebChromeClient是辅助WebView处理Javascript的对话框,网站图标,网站title,加载进度等
    onCloseWindow(关闭WebView)
    onCreateWindow()
    onJsAlert (WebView上alert是弹不出来东西的,需要定制你的WebChromeClient处理弹出)
    onJsPrompt
    onJsConfirm
    onProgressChanged
    onReceivedIcon
    onReceivedTitle

    隐藏弹窗动画

    <?xml version="1.0" encoding="utf-8"?>
    <translate xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="200"
        android:fromYDelta="0"
        android:toYDelta="100%"
        />
    

    显示弹窗动画

    <?xml version="1.0" encoding="utf-8"?>
    <translate xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="200"
        android:fromYDelta="100%"
        android:toYDelta="0"
       />
    

    dialog样式

    
        <style name="ActionSheetDialogStyle" parent="@android:style/Theme.Dialog">
    
            <!-- 背景透明 -->
            <item name="android:windowBackground">@android:color/transparent</item>
            <item name="android:windowContentOverlay">@null</item>
            <!-- 浮于Activity之上 -->
            <item name="android:windowIsFloating">true</item>
            <!-- 边框 -->
            <item name="android:windowFrame">@null</item>
            <!-- Dialog以外的区域模糊效果 -->
            <item name="android:backgroundDimEnabled">true</item>
            <!-- 无标题 -->
            <item name="android:windowNoTitle">true</item>
            <!-- 半透明 -->
            <item name="android:windowIsTranslucent">true</item>
            <!-- Dialog进入及退出动画 -->
            <item name="android:windowAnimationStyle">@style/ActionSheetDialogAnimation</item>
        </style>
        <!-- ActionSheet进出动画 -->
        <style name="ActionSheetDialogAnimation" parent="@android:style/Animation.Dialog">
            <item name="android:windowEnterAnimation">@anim/show</item>
            <item name="android:windowExitAnimation">@anim/out</item>
        </style>
    

    3、photoUtils

    public class PhotoUtils {
        private static final String TAG = "PhotoUtils";
    
        /**
         * @param activity    当前activity
         * @param imageUri    拍照后照片存储路径
         * @param requestCode 调用系统相机请求码
         */
        public static void takePicture(Activity activity, Uri imageUri, int requestCode) {
            //调用系统相机
            Intent intentCamera = new Intent();
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                intentCamera.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); //添加这一句表示对目标应用临时授权该Uri所代表的文件
            }
            intentCamera.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
            //将拍照结果保存至photo_file的Uri中,不保留在相册中
            intentCamera.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            if (activity != null) {
                activity.startActivityForResult(intentCamera, requestCode);
            }
        }
    
        /**
         * @param activity    当前activity
         * @param requestCode 打开相册的请求码
         */
        public static void openPic(Activity activity, int requestCode) {
            Intent photoPickerIntent = new Intent(Intent.ACTION_GET_CONTENT);
            photoPickerIntent.setType("image/*");
            activity.startActivityForResult(photoPickerIntent, requestCode);
        }
    
        /**
         * @param activity    当前activity
         * @param orgUri      剪裁原图的Uri
         * @param desUri      剪裁后的图片的Uri
         * @param aspectX     X方向的比例
         * @param aspectY     Y方向的比例
         * @param width       剪裁图片的宽度
         * @param height      剪裁图片高度
         * @param requestCode 剪裁图片的请求码
         */
        public static void cropImageUri(Activity activity, Uri orgUri, Uri desUri, int aspectX, int aspectY, int width, int height, int requestCode) {
            Intent intent = new Intent("com.android.camera.action.CROP");
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            }
            intent.setDataAndType(orgUri, "image/*");
            intent.putExtra("crop", "true");
            intent.putExtra("aspectX", aspectX);
            intent.putExtra("aspectY", aspectY);
            intent.putExtra("outputX", width);
            intent.putExtra("outputY", height);
            intent.putExtra("scale", true);
            //将剪切的图片保存到目标Uri中
            intent.putExtra(MediaStore.EXTRA_OUTPUT, desUri);
            intent.putExtra("return-data", false);
            intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
            intent.putExtra("noFaceDetection", true);
            activity.startActivityForResult(intent, requestCode);
        }
        /**
         * 读取uri所在的图片
         *
         * @param uri      图片对应的Uri
         * @param mContext 上下文对象
         * @return 获取图像的Bitmap
         */
        public static Bitmap getBitmapFromUri(Uri uri, Context mContext) {
            try {
    //            Bitmap bitmap = MediaStore.Images.Media.getBitmap(mContext.getContentResolver(), uri);
                Bitmap bitmapFormUri = getBitmapFormUri(mContext, uri);
                return bitmapFormUri;
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }
    
        /**
         * 通过uri获取图片并进行压缩
         *
         * @param uri
         */
        public static Bitmap getBitmapFormUri(Context ac, Uri uri) throws FileNotFoundException, IOException {
            InputStream input = ac.getContentResolver().openInputStream(uri);
            BitmapFactory.Options onlyBoundsOptions = new BitmapFactory.Options();
            onlyBoundsOptions.inJustDecodeBounds = true;
            onlyBoundsOptions.inDither = true;//optional
            onlyBoundsOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;//optional
            BitmapFactory.decodeStream(input, null, onlyBoundsOptions);
            input.close();
            int originalWidth = onlyBoundsOptions.outWidth;
            int originalHeight = onlyBoundsOptions.outHeight;
            if ((originalWidth == -1) || (originalHeight == -1)) {
                return null;
            }
            //图片分辨率以480x800为标准
            float hh = 800f;//这里设置高度为800f
            float ww = 480f;//这里设置宽度为480f
            //缩放比。由于是固定比例缩放,只用高或者宽其中一个数据进行计算即可
            int be = 1;//be=1表示不缩放
            if (originalWidth > originalHeight && originalWidth > ww) {//如果宽度大的话根据宽度固定大小缩放
                be = (int) (originalWidth / ww);
            } else if (originalWidth < originalHeight && originalHeight > hh) {//如果高度高的话根据宽度固定大小缩放
                be = (int) (originalHeight / hh);
            }
            if (be <= 0) {
                be = 1;
            }
            //比例压缩
            BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
            bitmapOptions.inSampleSize = be;//设置缩放比例
            bitmapOptions.inDither = true;//optional
            bitmapOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;//optional
            input = ac.getContentResolver().openInputStream(uri);
            Bitmap bitmap = BitmapFactory.decodeStream(input, null, bitmapOptions);
            input.close();
            return compressImage(bitmap);//再进行质量压缩
        }
    
        /**
         * 质量压缩方法
         *
         * @param image
         * @return
         */
        public static Bitmap compressImage(Bitmap image) {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法,这里100表示不压缩,把压缩后的数据存放到baos中
            int options = 100;
            while (baos.toByteArray().length / 1024 > 100) {  //循环判断如果压缩后图片是否大于100kb,大于继续压缩
                baos.reset();//重置baos即清空baos
                //第一个参数 :图片格式 ,第二个参数: 图片质量,100为最高,0为最差  ,第三个参数:保存压缩后的数据的流
                image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%,把压缩后的数据存放到baos中
                options -= 10;//每次都减少10
            }
            ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中
            Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片
            return bitmap;
        }
    
    
        /**
         * @param context 上下文对象
         * @param uri     当前相册照片的Uri
         * @return 解析后的Uri对应的String
         */
        @SuppressLint("NewApi")
        public static String getPath(final Context context, final Uri uri) {
    
            final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
            String pathHead = "file:///";
            // 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 pathHead + Environment.getExternalStorageDirectory() + "/" + split[1];
                    }
                }
                // 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 pathHead + 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 pathHead + getDataColumn(context, contentUri, selection, selectionArgs);
                }
            }
            // MediaStore (and general)
            else if ("content".equalsIgnoreCase(uri.getScheme())) {
                return pathHead + getDataColumn(context, uri, null, null);
            }
            // File
            else if ("file".equalsIgnoreCase(uri.getScheme())) {
                return pathHead + 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.
         */
        private 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.
         */
        private 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.
         */
        private 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.
         */
        private static boolean isMediaDocument(Uri uri) {
            return "com.android.providers.media.documents".equals(uri.getAuthority());
        }
    }
    

    调用Android的相机实在是坑,因为测试机有限,所以还不知道会有什么问题先记录到这吧。

    最后非常感谢这篇博客,给了我很大的帮助。
    深坑之Webview,解决H5调用android相机拍照和录像

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