在 webview 中从相机上传图像不起作用

Posted 2023-05-07

【中文标题】在 webview 中从相机上传图像不起作用

【英文标题】：upload image from camera in webview does not work

【发布时间】：2018-08-08 18:02:59

【问题描述】：

我一直在尝试通过来自画廊和相机的 webview 从 facebook 上传 Workplace 中的图像。

从图库中它可以正常工作，但从相机中，图像不会出现在上传中。

我已经看到类似this 和this 这样的问题的帖子，但我看不出有什么问题。

这是我的课：

public class WorkplaceActivity extends BaseActivity implements WorkplaceContract.View 

private WorkplacePresenter workplacePresenter;
private Tracker trackerGA;
private MyApplicaton appGA;
private Toolbar toolbar;
private WebView ctWebView;
private ValueCallback<Uri[]> mUploadMessage;
private final static int FILECHOOSER_RESULTCODE = 1;
private Uri mCameraURI;

@Override
public void setupWorkplace() 
    WebViewClient webclient = new WebViewClient();

    ctWebView = (WebView) findViewById(R.id.ctWebView);
    ctWebView.getSettings().setAppCacheEnabled(true);
    ctWebView.getSettings().setjavascriptEnabled(true);
    ctWebView.getSettings().setLoadWithOverviewMode(true);
    ctWebView.getSettings().setAllowFileAccess(true);
    ctWebView.setWebViewClient(webclient);
    ctWebView.loadUrl(ConstantsStrings.WORKPLACE_URL);


@Override
public void setupGA() 
    // Google Analytics
    appGA = (MyApplicaton) getApplication();
    trackerGA = appGA.getDefaultTracker();
    sendGA(ConstantsStrings.WORKPLACE_GA_IN);


@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_workplace);
    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    workplacePresenter = new WorkplacePresenter();
    workplacePresenter.attachView(this);
    workplacePresenter.checkPermissions(WorkplaceActivity.this);

    ActionBar actionBar = this.getSupportActionBar();
    if (actionBar != null) 
        actionBar.setDisplayHomeAsUpEnabled(false);
        actionBar.setDisplayShowHomeEnabled(false);
        actionBar.setHomeAsUpIndicator(R.drawable.ic_arrow_left);
        actionBar.setTitle("");

        // add back button
        ImageButton back_button = (ImageButton) findViewById(R.id.back_button);
        back_button.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View view) 
                if (ctWebView.canGoBack()) 
                    ctWebView.goBack();
                

                Log.d("WORKPLACE", "click back");
            
        );

        // add close button
        ImageButton close_button = (ImageButton) findViewById(R.id.close_button);
        close_button.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View view) 
                finish();

                Log.d("WORKPLACE", "click close");
            
        );

    

    setupGA();
    setupWorkplace();
    ctWebView.setWebChromeClient(new WebChromeClient() 
        @Override
        public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) 
            WorkplaceActivity.this.openFileChooser(filePathCallback);
            return true;
        
    );


@Override
public void onBackPressed() 
    super.onBackPressed();


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) 
    if (requestCode == FILECHOOSER_RESULTCODE) 
        if (mUploadMessage != null) 
            Uri[] temp = new Uri[1];
            if (intent != null && intent.getData() != null) 
                temp[0] = intent.getData();
             else if (mCameraURI != null) 
                temp[0] = mCameraURI;
            
            mUploadMessage.onReceiveValue(temp);
            mUploadMessage = null;
        
    


public static Intent newInstance(Context context) 
    return new Intent(context, WorkplaceActivity.class);


@Override
public void onAttachedToWindow() 
    super.onAttachedToWindow();
    workplacePresenter.attachView(this);


@Override
public void onDetachedFromWindow() 
    super.onDetachedFromWindow();
    workplacePresenter.detachView();


@Override
public void showLoading() 


@Override
public void hideLoading() 


@Override
public void sendGA(String msg) 
    // Google Analytics
    trackerGA = appGA.getDefaultTracker();
    trackerGA.setScreenName(msg);
    trackerGA.send(new HitBuilders.ScreenViewBuilder().build());


private void openFileChooser(ValueCallback<Uri[]> uploadMsg) 
    mUploadMessage = uploadMsg;

    try 
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        ActivityCompat.requestPermissions(WorkplaceActivity.this, new String[]Manifest.permission.CAMERA, FILECHOOSER_RESULTCODE);
        ActivityCompat.requestPermissions(WorkplaceActivity.this, new String[]Manifest.permission_group.STORAGE, 6);
        ActivityCompat.requestPermissions(WorkplaceActivity.this, new String[]Manifest.permission.WRITE_EXTERNAL_STORAGE, 5);
        File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        File cameraDir = new File(storageDir.getAbsolutePath() + File.separator + "browser-photos");
        cameraDir.mkdirs();
        String mCameraFilePath = cameraDir.getAbsolutePath() + File.separator + ".jpg";
        mCameraURI = Uri.fromFile(new File(mCameraFilePath));
        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCameraURI);


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

        Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
        chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
        chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]takePictureIntent);

        startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
     catch (Exception e) 
        Toast.makeText(getBaseContext(), "Camera Exception:" + e, Toast.LENGTH_LONG);
    

当我尝试从相机上传图像时，我的手机会保存图像，但它不会出现在上传屏幕上。

【参考方案1】：

检查一下它对我有用。

public class MainActivity extends Activity 

    private WebView webView;
    private ValueCallback<Uri> mUploadMessage;
    private ValueCallback<Uri[]> mUploadMessages;
    private Uri mCapturedImageURI = null;
    private static final int MY_CAMERA_REQUEST_CODE = 100;
    private static final int FILECHOOSER_RESULTCODE = 1;

    @RequiresApi(api = Build.VERSION_CODES.M)
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        webView = findViewById(R.id.webView);

        webView.setWebViewClient(new WebViewClient());

        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setDomStorageEnabled(true);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setDomStorageEnabled(true);
        webView.getSettings().setPluginState(WebSettings.PluginState.ON);
        webView.getSettings().setAppCacheEnabled(false);
        webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
        webView.getSettings().setUseWideViewPort(true);
        webView.getSettings().setLoadWithOverviewMode(true);
        webView.getSettings().setBuiltInZoomControls(false);
        webView.getSettings().setSupportZoom(false);
        webView.getSettings().setDefaultZoom(WebSettings.ZoomDensity.FAR);
        webView.getSettings().setDomStorageEnabled(true);
        webView.getSettings().setDatabaseEnabled(true);
        webView.getSettings().setDatabasePath("/data/data/" + webView.getContext().getPackageName() + "/databases/");

        webView.loadUrl("url");

        webView.setWebChromeClient(new WebChromeClient() 

            // For api level bellow 24
            public boolean shouldOverrideUrlLoading(WebView view, String url) 

                if (url.startsWith("http")) 
                    // Return false means, web view will handle the link
                    return false;
                

                return false;
            


            // From api level 24
            @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
            public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) 
                /*Toast.makeText(mcontext, "New Method",Toast.LENGTH_SHORT).show();*/

                // Get the tel: url
                String url = request.getUrl().toString();

                if (url.startsWith("http")) 
                    // Return false means, web view will handle the link
                    return false;
                

                return false;
            

            // openFileChooser for android 3.0+

            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) 
                mUploadMessage = uploadMsg;
                openImageChooser();
            

            // For Lollipop 5.0+ Devices

            public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) 
                mUploadMessages = filePathCallback;
                openImageChooser();
                return true;
            

            // 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);
            
        );

    

    private void openImageChooser() 
        try 

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

            if (!imageStorageDir.exists()) 
                imageStorageDir.mkdirs();
            
            File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
            mCapturedImageURI = Uri.fromFile(file);

            final Intent captureIntent = new Intent(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/*");

            Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
            chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]captureIntent);

            startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
         catch (Exception e) 
            e.printStackTrace();
        
    

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) 
        super.onActivityResult(requestCode, resultCode, intent);

        if (requestCode == FILECHOOSER_RESULTCODE) 

            if (null == this.mUploadMessage && null == this.mUploadMessages) 
                return;
            

           /* Uri result;
            if (requestCode != RESULT_OK)
                result = null;
            else 
                result = intent == null ? this.mCapturedImageURI : intent.getData();
            
            this.mUploadMessage.onReceiveValue(result);
            this.mUploadMessage = null;*/
            if (null != mUploadMessage) 
                handleUploadMessage(requestCode, resultCode, intent);

             else if (mUploadMessages != null) 
                handleUploadMessages(requestCode, resultCode, intent);
            
        
    

    private void handleUploadMessage(int requestCode, int resultCode, Intent intent) 
        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) 
            e.printStackTrace();
        
        mUploadMessage.onReceiveValue(result);
        mUploadMessage = null;
    

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void handleUploadMessages(int requestCode, int resultCode, Intent intent) 
        Uri[] results = null;
        try 
            if (resultCode != RESULT_OK) 
                results = null;
             else 
                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();
                        
                    
                    if (dataString != null) 
                        results = new Uri[]Uri.parse(dataString);
                    
                 else 
                    results = new Uri[]mCapturedImageURI;
                
            
         catch (Exception e) 
            e.printStackTrace();
        
        mUploadMessages.onReceiveValue(results);
        mUploadMessages = null;
    

【讨论】：

不要忘记在清单中以及以编程方式添加存储和相机权限。