我知道这个问题在这里被多次询问，但我刚开始进行android开发，所以很难混淆应用这些解决方案。我的代码FileUpload选项不起作用。它不是打开文件选择对话框。请帮帮我
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView mWebView = (WebView) findViewById(R.id.activity_main_webview);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mWebView.setWebViewClient(new WebViewClient());
mWebView.loadUrl("http://google.com");
}
}
答案 0 :(得分：2)
// variables for camera and choosing files methods private static final int FILECHOOSER_RESULTCODE = 1; private ValueCallback<Uri> mUploadMessage; private Uri mCapturedImageURI = null; // the same for Android 5.0 methods only private ValueCallback<Uri[]> mFilePathCallback; private String mCameraPhotoPath; private class DefaultWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); return true; } } @Override public void onActivityResult (int requestCode, int resultCode, Intent data) { // code for all versions except of Lollipop if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) { 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 = data == null ? mCapturedImageURI : data.getData(); } } catch(Exception e) { Toast.makeText(getApplicationContext(), "activity :"+e, Toast.LENGTH_LONG).show(); } mUploadMessage.onReceiveValue(result); mUploadMessage = null; } } // end of code for all versions except of Lollipop // start of code for Lollipop only if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { if (requestCode != FILECHOOSER_RESULTCODE || mFilePathCallback == null) { super.onActivityResult(requestCode, resultCode, data); return; } Uri[] results = null; // check that the response is a good one if (resultCode == Activity.RESULT_OK) { if (data == null || data.getData() == null) { // if there is not data, then we may have taken a photo if (mCameraPhotoPath != null) { results = new Uri[]{Uri.parse(mCameraPhotoPath)}; } } else { String dataString = data.getDataString(); if (dataString != null) { results = new Uri[]{Uri.parse(dataString)};} } } mFilePathCallback.onReceiveValue(results); mFilePathCallback = null; } // end of code for Lollipop only } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); WebView mWebView = (WebView) findViewById(R.id.webview); WebSettings webSettings = mWebView.getSettings(); webSettings.setSavePassword(true); webSettings.setSaveFormData(true); webSettings.setJavaScriptEnabled(true); webSettings.setSupportZoom(true); webSettings.setDomStorageEnabled(true); webSettings.setAllowContentAccess(true); webSettings.setAllowFileAccess(true); mWebView.setWebViewClient(new DefaultWebViewClient() ); mWebView.setWebChromeClient(new WebChromeClient() { // for Lollipop, all in one public boolean onShowFileChooser( WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) { if (mFilePathCallback != null) { mFilePathCallback.onReceiveValue(null); } mFilePathCallback = filePathCallback; Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); if (takePictureIntent.resolveActivity(getPackageManager()) != null) { File photoFile = null; try { photoFile = createImageFile(); takePictureIntent.putExtra("PhotoPath", mCameraPhotoPath); } catch (IOException ex) { // Error occurred while creating the File Log.e(TAG, "Unable to create Image File", ex); } if (photoFile != null) { mCameraPhotoPath = "file:" + photoFile.getAbsolutePath(); takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile)); } else { takePictureIntent = null; } } Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT); contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE); contentSelectionIntent.setType("*/*"); Intent[] intentArray; if (takePictureIntent != null) { intentArray = new Intent[]{takePictureIntent}; } else { intentArray = new Intent[0]; } Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER); chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent); chooserIntent.putExtra(Intent.EXTRA_TITLE, "Choose"); chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray); startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE); return true; } private File createImageFile() throws IOException { File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "DirectoryNameHere"); if (!imageStorageDir.exists()) { imageStorageDir.mkdirs(); } // create an image file name imageStorageDir = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg"); return imageStorageDir; } // openFileChooser for Android 3.0+ public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) { mUploadMessage = uploadMsg; try { File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "DirectoryNameHere"); if (!imageStorageDir.exists()) { imageStorageDir.mkdirs(); } File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg"); mCapturedImageURI = Uri.fromFile(file); // save to the private variable final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI); // captureIntent.putExtra(MediaStore.EXTRA_SCREEN_ORIENTATION, ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); Intent i = new Intent(Intent.ACTION_GET_CONTENT); i.addCategory(Intent.CATEGORY_OPENABLE); i.setType("*/*"); Intent chooserIntent = Intent.createChooser(i, "Choose"); chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]{captureIntent}); startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE); } catch (Exception e) { Toast.makeText(getBaseContext(), "Camera Exception:" + e, Toast.LENGTH_LONG).show(); } } // openFileChooser for Android < 3.0 public void openFileChooser(ValueCallback<Uri> uploadMsg) { openFileChooser(uploadMsg, ""); } // openFileChooser for other Android versions /* may not work on KitKat due to lack of implementation of openFileChooser() or onShowFileChooser() https://code.google.com/p/android/issues/detail?id=62220 however newer versions of KitKat fixed it on some devices */ public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) { openFileChooser(uploadMsg, acceptType); } }); mWebView.loadUrl("http://google.com"); }