最近因為趕專案進度，因此將本來要用原生控制元件實現的介面，自己做了H5並嵌入webview中。發現點選H5中 <input type="file"/>標籤 不能開啟android資源管理器。

通過網路搜尋發現是因為 android webview 由於考慮安全原因遮蔽了 <input type="file"/> 這個功能 。

經過不懈的努力，以及google 翻譯的幫助 在 stackoverflow 中找到了解決的方法。

具體可以理解為 重寫webview 的WebChromeClient ，廢話不多說直接貼程式碼:

private ValueCallback<Uri> mUploadMessage
 
;
public ValueCallback<Uri[]> uploadMessage;
public static final int REQUEST_SELECT_FILE = 100;
private final static int FILECHOOSER_RESULTCODE = 2;

webview.setWebChromeClient(new WebChromeClient(){

        // For 3.0+ Devices (Start)
        // onActivityResult attached before constructor
protected void 
 
openFileChooser(ValueCallback uploadMsg, String acceptType)
        {
            mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE
 
);
}


        // For Lollipop 5.0+ Devices
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
        public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams)
        {
            if (uploadMessage != null) {
                uploadMessage.onReceiveValue(null);
uploadMessage = null;
}

            uploadMessage = filePathCallback;
Intent intent = fileChooserParams.createIntent();
            try
{
                startActivityForResult(intent, REQUEST_SELECT_FILE);
} catch (ActivityNotFoundException e)
            {
                uploadMessage = null;
Toast.makeText(getBaseContext(), "Cannot Open File Chooser", Toast.LENGTH_LONG).show();
                return false;
}
            return true;
}

        //For Android 4.1 only
protected void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture)
        {
            mUploadMessage = uploadMsg;
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE);
}

        protected void openFileChooser(ValueCallback<Uri> uploadMsg)
        {
            mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
}

    });
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent)
{

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
    {
        if (requestCode == REQUEST_SELECT_FILE)
        {
            if (uploadMessage == null)
                return;
uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, intent));
uploadMessage = null;
}
    }
    else if (requestCode == FILECHOOSER_RESULTCODE)
    {
        if (null == mUploadMessage)
            return;
// Use MainActivity.RESULT_OK if you're implementing WebView inside Fragment
        // Use RESULT_OK only if you're implementing WebView inside an Activity
Uri result = intent == null || resultCode != MainActivity.RESULT_OK ? null : intent.getData();
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
}
    else
Toast.makeText(getBaseContext(), "Failed to Upload Image", Toast.LENGTH_LONG).show();
}