Question

我是android的新手。我正在创建一个小应用程序来拍照并将其上传到服务器。我正在使用Webview和html表单来做到这一点。在浏览器（铬）相机打开。但是在webview中，单击“选择文件”时不会打开相机。有人知道解决方案吗？以下是我使用的代码......

HTML代码

<html>
<body>
<form>
<input type="file" accept="image/*;capture=camera"/>
<input type="submit"/>
</form>
</body>
</html>

Android中使用的Java代码（eclipse）

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    WebView myWebView = (WebView) findViewById(R.id.webview);
    myWebView.setWebViewClient(new WebViewClient());
    WebSettings webSettings = myWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    myWebView.loadUrl("http://www.inforge.in/thejus/test.html");
}       


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

}

Answer 1

试试这个：

webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setPluginState(WebSettings.PluginState.ON);
webview.getSettings().setMediaPlaybackRequiresUserGesture(false);

webview.setWebChromeClient(new WebChromeClient(){
    // Need to accept permissions to use the camera
    @Override
    public void onPermissionRequest(final PermissionRequest request) {
        LogAV.d("onPermissionRequest");
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            request.grant(request.getResources());
        }
    }
});

Answer 2

此处填写完整代码。

public class ShowWebView extends Activity {

//private Button button;
private WebView webView;
final Activity activity = this;
public Uri imageUri;

private static final int FILECHOOSER_RESULTCODE   = 2888;
private ValueCallback<Uri> mUploadMessage;
private Uri mCapturedImageURI = null;


public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.show_web_view);

    //Get webview 
    webView = (WebView) findViewById(R.id.webView1);

    // Define url that will open in webview 
    String webViewUrl = "http://www.androidexample.com/media/webview/details.html";



    // Javascript inabled on webview  
    webView.getSettings().setJavaScriptEnabled(true);

    // Other webview options
    webView.getSettings().setLoadWithOverviewMode(true);

    //webView.getSettings().setUseWideViewPort(true);

    //Other webview settings
    webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
    webView.setScrollbarFadingEnabled(false);
    webView.getSettings().setBuiltInZoomControls(true);
    webView.getSettings().setPluginState(PluginState.ON);
    webView.getSettings().setAllowFileAccess(true);
    webView.getSettings().setSupportZoom(true); 

    //Load url in webview
    webView.loadUrl(webViewUrl);

    // Define Webview manage classes
    startWebView(); 

} 

private void startWebView() {



    // Create new webview Client to show progress dialog
    // Called When opening a url or click on link
    // You can create external class extends with WebViewClient 
    // Taking WebViewClient as inner class

    webView.setWebViewClient(new WebViewClient() {      
        ProgressDialog progressDialog;

        //If you will not use this method url links are open in new brower not in webview
        public boolean shouldOverrideUrlLoading(WebView view, String url) {              

            // Check if Url contains ExternalLinks string in url 
            // then open url in new browser
            // else all webview links will open in webview browser
            if(url.contains("google")){ 

                // Could be cleverer and use a regex
                //Open links in new browser
                view.getContext().startActivity(
                        new Intent(Intent.ACTION_VIEW, Uri.parse(url)));

                // Here we can open new activity

                return true;

            } else {

                // Stay within this webview and load url
                view.loadUrl(url); 
                return true;
            }

        }



        //Show loader on url load
        public void onLoadResource (WebView view, String url) {

            // if url contains string androidexample
            // Then show progress  Dialog
            if (progressDialog == null && url.contains("androidexample") 
                    ) {

                // in standard case YourActivity.this
                progressDialog = new ProgressDialog(ShowWebView.this);
                progressDialog.setMessage("Loading...");
                progressDialog.show();
            }
        }

        // Called when all page resources loaded
        public void onPageFinished(WebView view, String url) {

            try{
                // Close progressDialog
                if (progressDialog.isShowing()) {
                    progressDialog.dismiss();
                    progressDialog = null;
                }
            }catch(Exception exception){
                exception.printStackTrace();
            }
        }

    }); 


    // You can create external class extends with WebChromeClient 
    // Taking WebViewClient as inner class
    // we will define openFileChooser for select file from camera or sdcard

    webView.setWebChromeClient(new WebChromeClient() {

        // openFileChooser for Android 3.0+
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType){  

            // Update message
            mUploadMessage = uploadMsg;

            try{    

                // Create AndroidExampleFolder at sdcard

                File imageStorageDir = new File(
                                       Environment.getExternalStoragePublicDirectory(
                                       Environment.DIRECTORY_PICTURES)
                                       , "AndroidExampleFolder");

                if (!imageStorageDir.exists()) {
                    // Create AndroidExampleFolder at sdcard
                    imageStorageDir.mkdirs();
                }

                // Create camera captured image file path and name 
                File file = new File(
                                imageStorageDir + File.separator + "IMG_"
                                + String.valueOf(System.currentTimeMillis()) 
                                + ".jpg");

                mCapturedImageURI = Uri.fromFile(file); 

                // Camera capture image intent
                final Intent captureIntent = new Intent(
                                              android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

                captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);

                Intent i = new Intent(Intent.ACTION_GET_CONTENT); 
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("image/*");

                // Create file chooser intent
                Intent chooserIntent = Intent.createChooser(i, "Image Chooser");

                // Set camera intent to file chooser 
                chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS
                                       , new Parcelable[] { captureIntent });

                // On select image call onActivityResult method of activity
                startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);

              }
             catch(Exception e){
                 Toast.makeText(getBaseContext(), "Exception:"+e, 
                            Toast.LENGTH_LONG).show();
             }

        }

        // openFileChooser for Android < 3.0
        public void openFileChooser(ValueCallback<Uri> uploadMsg){
            openFileChooser(uploadMsg, "");
        }

        //openFileChooser for other Android versions
        public void openFileChooser(ValueCallback<Uri> uploadMsg, 
                                   String acceptType, 
                                   String capture) {

            openFileChooser(uploadMsg, acceptType);
        }



        // The webPage has 2 filechoosers and will send a 
        // console message informing what action to perform, 
        // taking a photo or updating the file

        public boolean onConsoleMessage(ConsoleMessage cm) {  

            onConsoleMessage(cm.message(), cm.lineNumber(), cm.sourceId());
            return true;
        }

        public void onConsoleMessage(String message, int lineNumber, String sourceID) {
            //Log.d("androidruntime", "Show console messages, Used for debugging: " + message);

        }
    });   // End setWebChromeClient

}



// Return here when file selected from camera or from SDcard

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

 if(requestCode==FILECHOOSER_RESULTCODE)  
 {  

        if (null == this.mUploadMessage) {
            return;

        }

       Uri result=null;

       try{
            if (resultCode != RESULT_OK) {

                result = null;

            } else {

                // retrieve from the private variable if the intent is null
                result = intent == null ? mCapturedImageURI : intent.getData(); 
            } 
        }
        catch(Exception e)
        {
            Toast.makeText(getApplicationContext(), "activity :"+e,
             Toast.LENGTH_LONG).show();
        }

        mUploadMessage.onReceiveValue(result);
        mUploadMessage = null;

 }

}

// Open previous opened link from history on webview when back button pressed

@Override
// Detect when the back button is pressed
public void onBackPressed() {

    if(webView.canGoBack()) {

        webView.goBack();

    } else {
        // Let the system handle the back button
        super.onBackPressed();
    }
}

}

Answer 3

您可以浏览以下开源项目，了解其他人如何解决此问题。这可以帮助您改进/修复代码。指向感兴趣的代码段的直接链接：Getting camera permission in SmartWebView。

Android Smart WebView. Open Source Project to upload files, get GPS locations and more advanced features

此外，您的代码没有任何图像捕获意图或任何文件选择器方法，您需要它们使用相机和文件创建方法来将新图像写入设备。并且，在您的清单中，您需要WRITE_EXTERNAL_STORAGE权限才能将新文件写入设备以进行上传。

希望它有所帮助。

Answer 4

您的输入标签可能格式错误。

试试这个。它适用于新的HTML媒体捕获规范

<input type="file" name="file" accept="image/*" capture>

或者试试这个旧版本

<input type="file" name="file" accept="image/*" capture="camera">

编辑...

或者更好的是，使用意图。

Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);

来源：http://developer.android.com/training/camera/photobasics.html#TaskCaptureIntent

在Webview中打开摄像头输入类型文件而不打开Android

4 个答案: