我尝试使用多部分表单数据上传文件，但在此行中获得空点异常
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
Process: zupportdesk.desk.zupport.chatsystem, PID: 6643
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://com.google.android.apps.photos.contentprovider/-1/1/content://media/external/file/213/ORIGINAL/NONE/1958544359 flg=0x1 clip={text/uri-list U:content://com.google.android.apps.photos.contentprovider/-1/1/content%3A%2F%2Fmedia%2Fexternal%2Ffile%2F213/ORIGINAL/NONE/1958544359} }} to activity {zupportdesk.desk.zupport.chatsystem/zupportdesk.desk.zupport.chatsystem.Chatting}: java.lang.NullPointerException: Attempt to invoke interface method 'int android.database.Cursor.getColumnIndexOrThrow(java.lang.String)' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:4053)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4096)
at android.app.ActivityThread.-wrap20(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1516)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'int android.database.Cursor.getColumnIndexOrThrow(java.lang.String)' on a null object reference
at zupportdesk.desk.zupport.chatsystem.Chatting.getPath(Chatting.java:276)
at zupportdesk.desk.zupport.chatsystem.Chatting.uploadMultipart(Chatting.java:290)
at zupportdesk.desk.zupport.chatsystem.Chatting.onActivityResult(Chatting.java:264)
at android.app.Activity.dispatchActivityResult(Activity.java:6917)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4049)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4096)
at android.app.ActivityThread.-wrap20(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1516)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
方式
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1)
if (resultCode == Chatting.RESULT_OK) {
Uri selectedImage = data.getData();
String filePath = getPath(selectedImage);
Log.d("chatting_imagePath2", filePath);
String file_extn = filePath.substring(filePath.lastIndexOf(".") + 1);
if (file_extn.equals("img") || file_extn.equals("jpg") || file_extn.equals("jpeg") || file_extn.equals("gif") || file_extn.equals("png")) {
//FINE
Uri myUri = Uri.parse(filePath);
uploadMultipart(myUri);
//multiPartPost(filePath);
} else {
//NOT IN REQUIRED FORMAT
}
}
}
public String getPath(Uri uri) {
String[] projection = {MediaStore.MediaColumns.DATA};
Cursor cursor = managedQuery(uri, projection, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
cursor.moveToFirst();
String imagePath = cursor.getString(column_index);
Log.d("chatting_imagePath", imagePath);
return cursor.getString(column_index);
}
public void uploadMultipart(Uri filePath) {
//getting name for the image
//getting the actual path of the image
String path = getPath(filePath);
//Uploading code
try {
String uploadId = UUID.randomUUID().toString();
//Creating a multi part request
new MultipartUploadRequest(this, uploadId, UPLOAD_URL)
.addFileToUpload(path, "image") //Adding file
.addParameter("name", "sathyabaman") //Adding text parameter to the request
.setNotificationConfig(new UploadNotificationConfig())
.setMaxRetries(2)
.startUpload(); //Starting the upload
} catch (Exception exc) {
Toast.makeText(this, exc.getMessage(), Toast.LENGTH_SHORT).show();
}
}
//Requesting permission
private void requestStoragePermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)
return;
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.READ_EXTERNAL_STORAGE)) {
//If the user has denied the permission previously your code will come to this block
//Here you can explain why you need this permission
//Explain here why you need this permission
}
//And finally ask for the permission
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, STORAGE_PERMISSION_CODE);
}
//This method will be called when the user will tap on allow or deny
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
//Checking the request code of our request
if (requestCode == STORAGE_PERMISSION_CODE) {
//If permission is granted
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//Displaying a toast
Toast.makeText(this, "Permission granted now you can read the storage", Toast.LENGTH_LONG).show();
} else {
//Displaying another toast if permission is not granted
Toast.makeText(this, "Oops you just denied the permission", Toast.LENGTH_LONG).show();
}
}
}
摇篮
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
testCompile 'junit:junit:4.12'
compile files('libs/gson-2.2.2.jar')
compile files('libs/signalr-client-sdk-android.jar')
compile files('libs/signalr-client-sdk.jar')
compile 'com.android.support:appcompat-v7:24.2.0'
compile 'com.android.support:recyclerview-v7:24.2.0'
compile 'com.android.support:design:24.2.0'
compile 'com.android.support:cardview-v7:24.2.0'
compile 'br.com.liveo:navigationdrawer-material:2.5.1'
compile 'org.java-websocket:Java-WebSocket:1.3.0'
compile 'com.google.android.gms:play-services:7.5.0'
compile files('libs/httpmime-4.3.1.jar')
compile 'net.gotev:uploadservice:2.1'
}