【移動應(yīng)用開發(fā)技術(shù)】Android中怎么利用WebView上傳文件

【移動應(yīng)用開發(fā)技術(shù)】Android中怎么利用WebView上傳文件

今天就跟大家聊聊有關(guān)Android中怎么利用WebView上傳文件，可能很多人都不太了解，為了讓大家更加了解，在下給大家總結(jié)了以下內(nèi)容，希望大家根據(jù)這篇文章可以有所收獲。1.接收WebView打開文件選擇器的通知2.收到通知后，打開文件選擇器等待用戶選擇需要上傳的文件3.在onActivityResult中得到用戶選擇的文件的Uri4.然后把Uri傳遞給Html5這樣就完成了一次H5選擇文件的過程，下面我把代碼貼出來自習看一下首先，WebView必須要支持JS交互，所以要打開JS交互mWebView.getSettings().setJavaScriptEnabled(true);當H5在調(diào)用上傳文件的Api的時候，WebView會回調(diào)openFileChooser和onShowFileChooser方法來通知我們，我們這個時候要做的就是重寫這個方法需要注意的是這個方法在不同的Api上會回調(diào)不同行參方法mWebView.setWebChromeClient(new

WebChromeClient()

{

@Override

public

void

onProgressChanged(WebView

view,

int

newProgress)

{

if

(newProgress

==

100)

{

mBar.setVisibility(View.GONE);

}

else

{

mBar.setVisibility(View.VISIBLE);

mBar.setProgress(newProgress);

}

super.onProgressChanged(view,

newProgress);

}

//For

Android

API

<

11

(3.0

OS)

public

void

openFileChooser(ValueCallback<Uri>

valueCallback)

{

uploadMessage

=

valueCallback;

openImageChooserActivity();

}

//For

Android

API

>=

11

(3.0

OS)

public

void

openFileChooser(ValueCallback<Uri>

valueCallback,

String

acceptType,

String

capture)

{

uploadMessage

=

valueCallback;

openImageChooserActivity();

}

//For

Android

API

>=

21

(5.0

OS)

@Override

public

boolean

onShowFileChooser(WebView

webView,

ValueCallback<Uri[]>

filePathCallback,

WebChromeClient.FileChooserParams

fileChooserParams)

{

uploadMessageAboveL

=

filePathCallback;

openImageChooserActivity();

return

true;

}

});我們在openFileChooser方法中先保存了一下ValueCallback的回調(diào)對象，這個對象最后用來通知H5文件地址，我們之后在調(diào)用openFileChooser方法來打開文件選擇器private

void

openImageChooserActivity()

{

Intent

i

=

new

Intent(Intent.ACTION_GET_CONTENT);

i.addCategory(Intent.CATEGORY_OPENABLE);

i.setType("image/*");

startActivityForResult(Intent.createChooser(i,

"Image

Chooser"),

FILE_CHOOSER_RESULT_CODE);

}當用戶選擇完文件后，會調(diào)用onActivityResult方法，我們重寫并等待回調(diào)@Override

protected

void

onActivityResult(int

requestCode,

int

resultCode,

Intent

data)

{

super.onActivityResult(requestCode,

resultCode,

data);

if

(requestCode

==

FILE_CHOOSER_RESULT_CODE)

{

if

(null

==

uploadMessage

&&

null

==

uploadMessageAboveL)

return;

Uri

result

=

data

==

null

||

resultCode

!=

RESULT_OK

?

null

:

data.getData();

if

(uploadMessageAboveL

!=

null)

{

onActivityResultAboveL(requestCode,

resultCode,

data);

}

else

if

(uploadMessage

!=

null)

{

uploadMessage.onReceiveValue(result);

uploadMessage

=

null;

}

}

}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)

private

void

onActivityResultAboveL(int

requestCode,

int

resultCode,

Intent

intent)

{

if

(requestCode

!=

FILE_CHOOSER_RESULT_CODE

||

uploadMessageAboveL

==

null)

return;

Uri[]

results

=

null;

if

(resultCode

==

Activity.RESULT_OK)

{

if

(intent

!=

null)

{

String

dataString

=

intent.getDataString();

ClipData

clipData

=

intent.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();

}

}