在Android浏览器中通过WebView调用相机拍照/选择文件 上传到服务器

最近做的一个项目中，有这样一个要求，在浏览器中调用系统的拍照功能或者选择文件，然后将文件上传到服务器，类似修改头像。 简单而言，就是在一个html页面中有这样一段代码 <input class="filePrew" type="file" capture="camera" accept="image/*" name="image">



刚开始的时候，没有感觉很难的，因为在UC浏览器、系统自带的浏览器中都可以进行拍照/文件管理器选择，可是在自己所写的Activity中却不行。后来实在是没有思路了，就在网上找了一下，发现要 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

[java] view
plaincopy

private ValueCallback<Uri> 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<Uri> 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