安卓网页查看文件上传

file-upload android java android-webview

2022-09-01 06:14:53

我正在开发一个安卓应用程序。基本上，它是一个和一个进度条。Facebook的移动网站（m.facebook.com）被加载到.WebViewWebView

当我单击“选择文件”按钮上传图像时，没有任何反应。我已经尝试了所有的解决方案，但没有一个有效。我正在运行4.0.3的Galaxy Note（GT-N7000）上进行测试。我的最低 SDK 版本是版本 8。

_{（资料来源：istyla.com）}

这是我的代码，以获取更多信息...

public class IStyla extends Activity {
    private ValueCallback<Uri> mUploadMessage;
    private final static int FILECHOOSER_RESULTCODE = 1;

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        if (requestCode == FILECHOOSER_RESULTCODE) {
            if (null == mUploadMessage)
                return;
            Uri result = intent == null || resultCode != RESULT_OK ? null
                    : intent.getData();
            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;

        }
    }
    private class MyWebChromeClient extends WebChromeClient {
        public void openFileChooser(ValueCallback<Uri> uploadMsg) {
            mUploadMessage = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("image/*");
            IStyla.this.startActivityForResult(Intent.createChooser(i, "Image Browser"), FILECHOOSER_RESULTCODE);
        }
    
        @Override
        public boolean onJsAlert(WebView view, String url, String message,final JsResult result) {
            //handle Alert event, here we are showing AlertDialog
            new AlertDialog.Builder(IStyla.this)
                .setTitle("JavaScript Alert !")
                .setMessage(message)
                .setPositiveButton(android.R.string.ok,
                    new AlertDialog.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            // do your stuff
                            result.confirm();
                        }
                    }).setCancelable(false).create().show();
            return true;
        }
    }
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_istyla);
        WebView webView = (WebView) findViewById(R.id.webView1);
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webView.setWebChromeClient(new MyWebChromeClient(){
            public void onProgressChanged(WebView view, int progress) {
                // Activities and WebViews measure progress with different scales.
                // The progress meter will automatically disappear when we reach 100%
                ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar1);
                if(progress < 100 && progressBar.getVisibility() == ProgressBar.GONE){
                    progressBar.setVisibility(ProgressBar.VISIBLE);
                }
                progressBar.setProgress(progress);
                if(progress == 100) {
                    progressBar.setVisibility(ProgressBar.GONE);
                }
            }
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                mUploadMessage = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("image/*");
                IStyla.this.startActivityForResult(Intent.createChooser(i, "Image Browser"), FILECHOOSER_RESULTCODE);
            }
        });
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar1);
                progressBar.setVisibility(ProgressBar.VISIBLE);
                return true;
            }
            
        });
        webView.loadUrl("https://m.facebook.com");

    }
    
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK){
            if(((WebView)findViewById(R.id.webView1)).canGoBack()){
                ((WebView)findViewById(R.id.webView1)).goBack();
                return true;
            }
        }
        return super.onKeyDown(keyCode, event);
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_istyla, menu);
        return true;
    }

}

谢谢

答案 1

这就是我在我的应用程序中使用的方式

 private class MyWebChromeClient extends WebChromeClient {
    //The undocumented magic method override
    //Eclipse will swear at you if you try to put @Override here


    // For Android 3.0+
    public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
        mUploadMessage = uploadMsg;
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType("*/*");
        startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE);
    }

    //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("*/*");
        startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE);
    }

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

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

        uploadMessage = filePathCallback;
        Intent intent = null;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            intent = fileChooserParams.createIntent();
        }
        try {
            startActivityForResult(intent, REQUEST_SELECT_FILE);
        } catch (ActivityNotFoundException e) {
            uploadMessage = null;
            Toast.makeText(getApplicationContext(), "Cannot Open File Chooser", Toast.LENGTH_LONG).show();
            return false;
        }
        return true;
    }

答案 2

Mike Olivier与Fr33dan分享的参考资料很重要。我正在分享在与你非常相似的情况下对我有用的东西。

wv.setWebChromeClient(new WebChromeClient()  {

// For Android 3.0+
public void openFileChooser( ValueCallback<Uri> uploadMsg, String acceptType ) {  
mUploadMessage = uploadMsg;  
Intent i = new Intent(Intent.ACTION_GET_CONTENT);  
i.addCategory(Intent.CATEGORY_OPENABLE);  
i.setType("image/*");  
MainActivity.this.startActivityForResult( Intent.createChooser( i, getString(R.string.fileselect) ), MainActivity.FILECHOOSER_RESULTCODE ); 
}

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


// For Android > 4.1
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture){
openFileChooser( uploadMsg, "" );
}
});

注意：我在堆栈溢出和m0s的博客中发现了这一点。

此外，忽略 lint 警告。这个对于API 8及更高版本非常有效。