您好，我为此搜索了很多，但还没有弄明白。我可以使用此代码上传单个图像并将图像推送到服务器。但问题是它不允许从图库中选择多个图像，或者当我单击一张图片时，它会替换上一张图片，而第二张图片不会显示。
我有下面的完整代码，有人可以建议我可能遗漏的内容吗。
public class MainActivity extends Activity {
WebView mWebView;
private PendingIntent pendingIntent;
String tag = "alarm_set_flag";
private Boolean alarm_set_flag;
SharedPreferences mPrefs;
private static final int INPUT_FILE_REQUEST_CODE = 1;
private static final int FILECHOOSER_RESULTCODE = 1;
private static final String TAG = MainActivity.class.getSimpleName();
private ValueCallback<Uri> mUploadMessage;
private Uri mCapturedImageURI = null;
private ValueCallback<Uri[]> mFilePathCallback;
private String mCameraPhotoPath;
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
if (requestCode != INPUT_FILE_REQUEST_CODE || 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) {
// 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;
} else if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
if (requestCode != FILECHOOSER_RESULTCODE || mUploadMessage == null)
{
super.onActivityResult(requestCode, resultCode, data);
return;
}
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;
}
}
return;
}
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;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
mWebView = (WebView) findViewById(R.id.webview);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
// This is for the JS Interface
mWebView.addJavascriptInterface(new WebViewJavaScriptInterface(this), "app");
mWebView.getSettings().setAllowFileAccess(true);
mWebView.setHapticFeedbackEnabled(false);
mWebView.loadUrl("my url");
ActivityCompat.requestPermissions(this, new String[]{
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION
}, 0);
mPrefs = getSharedPreferences(tag,0);
alarm_set_flag = mPrefs.getBoolean(tag,false);
mWebView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return false;
}
});
mWebView.setWebChromeClient(new WebChromeClient() {
@Override
public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
callback.invoke(origin, true, false);
}
// 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 (mFilePathCallback != null) {
mFilePathCallback.onReceiveValue(null);
}
mFilePathCallback = filePath;
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.setType("image/*");
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_ALLOW_MULTIPLE,true);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
startActivityForResult(chooserIntent, INPUT_FILE_REQUEST_CODE);
return true;
}
// openFileChooser for Android 3.0+
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
mUploadMessage = uploadMsg;
// Create AndroidExampleFolder at sdcard
// 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);
}
// 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);
}
});
mWebView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
return true;
}
});
mWebView.setLongClickable(false);
}
public class WebViewJavaScriptInterface{
private Context context;
/*
* Need a reference to the context in order to sent a post message
*/
public WebViewJavaScriptInterface(Context context){
this.context = context;
}
/*
* This method can be called from Android. @JavascriptInterface
* required after SDK version 17.
*/
@JavascriptInterface
public void jsBridge(int mints, int hrs, int ampm, int checkbox){
int Min = mints;
int Hours = hrs;
int AMPM = ampm;
int Checkbox = checkbox;
if(Checkbox == 1){
if(alarm_set_flag == true){
cancelDailyNotification();
setNotification(Hours,Min,AMPM);
SharedPreferences.Editor mEditor = mPrefs.edit();
mEditor.putBoolean(tag, true).commit();
Toast.makeText(getApplicationContext(), "Daily Notification has been set.", Toast.LENGTH_LONG).show();
}else{
setNotification(Hours,Min,AMPM);
SharedPreferences.Editor mEditor = mPrefs.edit();
mEditor.putBoolean(tag, true).commit();
Toast.makeText(getApplicationContext(), "Daily Notification has been set.", Toast.LENGTH_LONG).show();
}
}else {
if(alarm_set_flag == true){
cancelDailyNotification();
SharedPreferences.Editor mEditor = mPrefs.edit();
mEditor.putBoolean(tag, false).commit();
Toast.makeText(getApplicationContext(), "Daily Notification has been turned off.", Toast.LENGTH_LONG).show();
}else{
cancelDailyNotification();
SharedPreferences.Editor mEditor = mPrefs.edit();
mEditor.putBoolean(tag, false).commit();
Toast.makeText(getApplicationContext(), "Daily Notification is already turned off.", Toast.LENGTH_LONG).show();
}
}
}
}
public void setNotification(int hour, int minutes, int ampm){
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, hour);
calendar.set(Calendar.MINUTE, minutes);
calendar.set(Calendar.SECOND, 0);
if(ampm == 1) {
calendar.set(Calendar.AM_PM, Calendar.PM);
}else{
calendar.set(Calendar.AM_PM, Calendar.AM);
}
Intent myIntent = new Intent(MainActivity.this, notificationReceiver.class);
pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent,0);
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60 * 60 * 24,pendingIntent);
}
public void cancelDailyNotification(){
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent myIntent = new Intent(getApplicationContext(),
notificationReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
getApplicationContext(), 0, myIntent, PendingIntent.FLAG_UPDATE_CURRENT);
alarmManager.cancel(pendingIntent);
SharedPreferences.Editor mEditor = mPrefs.edit();
mEditor.putBoolean(tag, false).commit();
}
@Override
public boolean onKeyDown(int keyCode, @NonNull KeyEvent event){
String webUrl = mWebView.getUrl();
if(event.getAction() == KeyEvent.ACTION_DOWN){
switch(keyCode){
case KeyEvent.KEYCODE_BACK:
if(mWebView.canGoBack()){
if((webUrl.contains("url"))){
new AlertDialog.Builder(this).setTitle("title")
.setIcon(R.mipmap.ic_launcher)
.setMessage("Are you sure you want to exit the app?")
.setPositiveButton("yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
finish();
}
}).setNegativeButton("no", null).show();
}
else
if((webUrl.contains("url"))){
Toast.makeText(this, "Press the X button.",
Toast.LENGTH_SHORT).show();
}
else
if((webUrl.contains("url")||(webUrl.contains("file:///android_asset/error_page.html")||webUrl.contains("url")))) {
new AlertDialog.Builder(this).setTitle("title")
.setIcon(R.mipmap.ic_launcher)
.setMessage("Are you sure you want to exit the app?")
.setPositiveButton("yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
finish();
}
}).setNegativeButton("no", null).show();
}else {
mWebView.goBack();
}
}else {
new AlertDialog.Builder(this).setTitle("title")
.setIcon(R.mipmap.ic_launcher)
.setMessage("Are you sure you want to exit the app?")
.setPositiveButton("yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
finish();
}
}).setNegativeButton("no", null).show();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
最佳答案
在 OnActivityResult 中尝试此代码:
if (intent.getDataString() != null) {
results = new Uri[] {
Uri.parse(intent.getDataString())
};
} else {
if (Build.VERSION.SDK_INT >= 16) {
if (intent.getClipData() != null) {
final int numSelectedFiles = intent.getClipData().getItemCount();
results = new Uri[numSelectedFiles];
for (int i = 0; i < numSelectedFiles; i++) {
results[i] = intent.getClipData().getItemAt(i).getUri();
}
}
}
}
关于android - 如何允许从图库和相机将多个图像上传到 webview android，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45004572/