我有转换后的网站，以机器人网页视图应用。但是当我尝试从图库中获取图像时，我无法访问文件。
这是我尝试的代码
MainActivity
public class MainActivity extends AppCompatActivity {
private WebView myWebView;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myWebView = (WebView)findViewById(R.id.webView);
WebSettings webSettings =myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.setWebChromeClient(new WebChromeClient());
myWebView.loadUrl("URL");
myWebView.getSettings().setLoadWithOverviewMode(true);
myWebView.getSettings().setUseWideViewPort(true);
webSettings.setAllowFileAccess(true);
myWebView.getSettings().setAllowContentAccess(true);
myWebView.getSettings().setAllowFileAccessFromFileURLs(true);
myWebView.getSettings().setAllowUniversalAccessFromFileURLs(true);
myWebView.clearCache(true);
myWebView.getSettings().setDomStorageEnabled(true);
myWebView.getSettings().setAllowFileAccess(true);
myWebView.getSettings().setGeolocationEnabled(true);
}
@Override
public void onBackPressed() {
if(myWebView.canGoBack()){
myWebView.goBack();
}else{
super.onBackPressed();
}
}
}
清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_GPS" />
<uses-permission android:name="android.permission.ACCESS_ASSISTED_GPS" />
<uses-permission android:name="android.permission.ACCESS_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="label"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:usesCleartextTraffic="true"
android:hardwareAccelerated="true">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
HTML
<input type="file" #image accept="image/*" (change)="handleInputChange($event)" style="display: none;">
有人知道为什么我无法访问文件吗？我无法找到任何解决办法，以获得帮助。这是有关这个问题，但没有一个人回答另一个问题 related another problem
答案 0 :(得分：1)
public class MainActivity extends AppCompatActivity {
private static final int INPUT_FILE_REQUEST_CODE = 1;
private static final String TAG = MainActivity.class.getSimpleName();
// Storage Permissions variables
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
android.Manifest.permission.READ_EXTERNAL_STORAGE,
android.Manifest.permission.WRITE_EXTERNAL_STORAGE,
android.Manifest.permission.CAMERA
};
private WebView webView;
private WebSettings webSettings;
private ValueCallback<Uri[]> mUploadMessage;
private String mCameraPhotoPath = null;
private long size = 0;
public static void verifyStoragePermissions(Activity activity) {
// Check if we have read or write permission
int writePermission = ContextCompat.checkSelfPermission(activity,
android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
int readPermission = ContextCompat.checkSelfPermission(activity,
android.Manifest.permission.READ_EXTERNAL_STORAGE);
int cameraPermission = ContextCompat.checkSelfPermission(activity,
android.Manifest.permission.CAMERA);
if (writePermission != PackageManager.PERMISSION_GRANTED ||
readPermission != PackageManager.PERMISSION_GRANTED || cameraPermission
!= PackageManager.PERMISSION_GRANTED) {
// We don't have permission so prompt the user
ActivityCompat.requestPermissions(
activity,
PERMISSIONS_STORAGE,
REQUEST_EXTERNAL_STORAGE
);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode != INPUT_FILE_REQUEST_CODE || mUploadMessage == null) {
super.onActivityResult(requestCode, resultCode, data);
return;
}
try {
String file_path = mCameraPhotoPath.replace("file:", "");
File file = new File(file_path);
size = file.length();
} catch (Exception e) {
Log.e("Error!", "Error while opening image file" +
e.getLocalizedMessage());
}
if (data != null || mCameraPhotoPath != null) {
Integer count = 0; //fix fby https://github.com/nnian
ClipData images = null;
try {
images = data.getClipData();
} catch (Exception e) {
Log.e("Error!", e.getLocalizedMessage());
}
if (images == null && data != null && data.getDataString() != null)
{
count = data.getDataString().length();
} else if (images != null) {
count = images.getItemCount();
}
Uri[] results = new Uri[count];
// Check that the response is a good one
if (resultCode == Activity.RESULT_OK) {
if (size != 0) {
// If there is not data, then we may have taken a photo
if (mCameraPhotoPath != null) {
results = new Uri[]{Uri.parse(mCameraPhotoPath)};
}
} else if (data.getClipData() == null) {
results = new Uri[]{Uri.parse(data.getDataString())};
} else {
for (int i = 0; i < images.getItemCount(); i++) {
results[i] = images.getItemAt(i).getUri();
}
}
}
mUploadMessage.onReceiveValue(results);
mUploadMessage = null;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
verifyStoragePermissions(this);
webView = (WebView) findViewById(R.id.webview);
webSettings = webView.getSettings();
webSettings.setAppCacheEnabled(true);
webSettings.setCacheMode(webSettings.LOAD_CACHE_ELSE_NETWORK);
webSettings.setJavaScriptEnabled(true);
webSettings.setLoadWithOverviewMode(true);
webSettings.setAllowFileAccess(true);
webView.setWebViewClient(new PQClient());
webView.setWebChromeClient(new PQChromeClient());
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
//if SDK version is greater of 19 then activate hardware acceleration
otherwise activate software acceleration
if (Build.VERSION.SDK_INT >= 19) {
webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
} else if (Build.VERSION.SDK_INT >= 11 && Build.VERSION.SDK_INT < 19) {
webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
webView.loadUrl("https://www.google.com");
webView.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
ProgressBar progressbar = (ProgressBar)
findViewById(R.id.progress_bar);
progressbar.setVisibility(View.GONE);
}
});
}
;
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new
Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
File imageFile = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
return imageFile;
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
// Check if the key event was the Back button and if there's history
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack();
return true;
}
// If it wasn't the Back key or there's no web page history, bubble up
to the default
// system behavior (probably exit the activity)
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// handle arrow click here
if (item.getItemId() == android.R.id.home) {
Intent i = new Intent(MainActivity.this, Home.class);
startActivity(i);
finish(); // close this activity and return to preview activity (if
there is any)
}
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed() {
// code here to show dialog
Intent i = new Intent(MainActivity.this, Home.class);
startActivity(i);
finish();
super.onBackPressed();
}
public class PQChromeClient extends WebChromeClient {
// For Android 5.0+
public boolean onShowFileChooser(WebView view, ValueCallback<Uri[]>
filePath, WebChromeClient.FileChooserParams fileChooserParams) {
// Double check that we don't have any existing callbacks
if (mUploadMessage != null) {
mUploadMessage.onReceiveValue(null);
}
mUploadMessage = filePath;
Log.e("FileCooserParams => ", filePath.toString());
Intent takePictureIntent = new
Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null)
{
// Create the File where the photo should go
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);
}
// Continue only if the File was successfully created
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.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
contentSelectionIntent.setType("image/*");
Intent[] intentArray;
if (takePictureIntent != null) {
intentArray = new Intent[]{takePictureIntent};
} else {
intentArray = new Intent[2];
}
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Select Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
startActivityForResult(Intent.createChooser(chooserIntent, "Select
Files"), 1);
return true;
}
}
public class PQClient extends WebViewClient {
ProgressDialog progressDialog;
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// If url contains mailto link then open Mail Intent
if (url.contains("mailto:")) {
// 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 onPageStarted(WebView view, String url, Bitmap favicon) {
// Then show progress Dialog
// in standard case MainActivity.this
if (progressDialog == null) {
progressDialog = new ProgressDialog(MainActivity.this);
progressDialog.setMessage("Loading...");
progressDialog.hide();
}
}
// Called when all page resources loaded
public void onPageFinished(WebView view, String url) {
webView.loadUrl("javascript:(function(){ " +
"document.getElementById('android-
app').style.display='none';})()");
try {
// Close progressDialog
if (progressDialog.isShowing()) {
progressDialog.dismiss();
progressDialog = null;
}
} catch (Exception exception) {
exception.printStackTrace();
}
}
}
}
web.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<WebView
android:id="@+id/webview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" />
<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
</RelativeLayout>