在Android中通过WebView调用相机拍照/选择文件

最新推荐文章于 2025-05-26 15:55:23 发布

转载最新推荐文章于 2025-05-26 15:55:23 发布 · 3.1k 阅读

文章标签：

#android #webview

webview 专栏收录该内容

0 篇文章

订阅专栏

本文介绍如何在Android WebView中实现文件和图片的上传功能。通过重写WebChromeClient的openFileChooser方法，并处理Intent请求与响应，实现了从Android 3.0到4.1不同版本的兼容方案。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

实现这种功能，都是在webview的WebChromeClient中覆盖掉openFileChooser方法，注意openFileChooser方法在WebChromeClient中有@hide标记。这里只管重写即可,下面将主要代码贴出来，做个记录

private ValueCallback mUploadFile;
/拍照/选择文件请求码*/
private static final int REQUEST_UPLOAD_FILE_CODE = 12343;
private void setWebChromeClient()
{
if (null != mMainWebView)
{
mMainWebView.setWebChromeClient(new WebChromeClient()
{
// Andorid 4.1+
public void openFileChooser(ValueCallback uploadFile, String acceptType, String capture)
{
openFileChooser(uploadFile);
}

            // Andorid 3.0 +  
            public void openFileChooser(ValueCallback<Uri> uploadFile, String acceptType)  
            {  
                openFileChooser(uploadFile);  
            }  

            // Android 3.0  
            public void openFileChooser(ValueCallback<Uri> uploadFile)  
            {  
                // Toast.makeText(WebviewActivity.this, "上传文件/图片",Toast.LENGTH_SHORT).show();  
                mUploadFile = uploadFile;  
                startActivityForResult(Intent.createChooser(createCameraIntent(), "Image Browser"), REQUEST_UPLOAD_FILE_CODE);  
            }  
        });  
    }  
}  

private Intent createCameraIntent()  
{  
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//拍照  
    //=======================================================  
    Intent imageIntent = new Intent(Intent.ACTION_GET_CONTENT);//选择图片文件  
    imageIntent.setType("image/*");  
    //=======================================================  
    return cameraIntent;  
}  
//最后在OnActivityResult中接受返回的结果  
protected void onActivityResult(int requestCode, int resultCode, Intent data)  
{  
    if (requestCode == REQUEST_UPLOAD_FILE_CODE && resultCode == RESULT_OK)  
    {  
        if (null == mUploadFile)  
        {  
            return;  
        }  
        Uri result = (null == data) ? null : data.getData();  
        if (null != result)  
        {  
            ContentResolver resolver = this.getContentResolver();  
            String[] columns = { MediaStore.Images.Media.DATA };  
            Cursor cursor = resolver.query(result, columns, null, null, null);  
            cursor.moveToFirst();  
            int columnIndex = cursor.getColumnIndex(columns[0]);  
            String imgPath = cursor.getString(columnIndex);  
            System.out.println("imgPath = " + imgPath);  
            if (null == imgPath)  
            {  
                return;  
            }  
            File file = new File(imgPath);  
               //将图片处理成大小符合要求的文件  
            result = Uri.fromFile(handleFile(file));  
            mUploadFile.onReceiveValue(result);  
            mUploadFile = null;       
        }  
    }  
    super.onActivityResult(requestCode, resultCode, data);  
}  
/处理拍照/选择的文件*/  
private File handleFile(File file)  
{  
    DisplayMetrics dMetrics = getResources().getDisplayMetrics();  
    BitmapFactory.Options options = new Options();  
    options.inJustDecodeBounds = true;  
     BitmapFactory.decodeFile(file.getAbsolutePath(), options);  
    int imageWidth = options.outWidth;  
    int imageHeight = options.outHeight;  
    System.out.println("  imageWidth = " + imageWidth + " imageHeight = " + imageHeight);  
    int widthSample = (int) (imageWidth / (dMetrics.density * 90));  
    int heightSample = (int) (imageHeight / (dMetrics.density * 90));  
    System.out.println("widthSample = " + widthSample + " heightSample = " + heightSample);  
    options.inSampleSize = widthSample < heightSample ? heightSample : widthSample;  
    options.inJustDecodeBounds = false;  
    Bitmap newBitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);  
    System.out.println("newBitmap.size = " + newBitmap.getRowBytes() * newBitmap.getHeight());  
    File handleFile = new File(file.getParentFile(), "upload.png");  
    try  
    {  
        if (newBitmap.compress(CompressFormat.PNG, 50, new FileOutputStream(handleFile)))  
        {  
            System.out.println("保存图片成功");  
        }  
    }  
    catch (FileNotFoundException e)  
    {  
        e.printStackTrace();  
    }  

    return handleFile;  

}

这样就可以在WebView中上传文件了。记得要添加相应的权限！
参考：http://developer.android.com/about/versions/android-3.0.html
http://blog.sina.com.cn/s/blog_5749ead90101clrn.html