无法使用此方法在USB存储中创建文件夹：
import { Component, OnInit, EventEmitter, Output, ViewChild, AfterViewInit, trigger, state, style, animate, transition } from '@angular/core';
import { DataGridColumn, DataGridButton, DataGridEventInformation } from '../shared/datagrid/datagrid.core';
import { DataGrid } from '../shared/datagrid/datagrid.component';
import { Router } from '@angular/router';
import { AlertService } from '../shared/services/alert.service';
import { CustomerService } from '../shared/services/customer.service';
import { AlertBoxComponent } from '../shared/alertbox.component';
import { Customer } from '../shared/entities/customer.entity';
import { TransactionalInformation } from '../shared/entities/transactionalinformation.entity';
import { NotificationService } from '../shared/utils/notification.service';
@Component({
moduleId: module.id,
templateUrl: 'home.component.html',
animations: [
trigger('flyInOut', [
state('in', style({ opacity: 1, transform: 'translateX(0)' })),
transition('void => *', [
style({
opacity: 0,
transform: 'translateX(-100%)'
}),
animate('0.6s ease-in')
]),
transition('* => void', [
animate('0.2s 10 ease-out', style({
opacity: 0,
transform: 'translateX(100%)'
}))
])
])
]
})
export class HomeComponent implements OnInit {
@ViewChild(DataGrid) private Grid: DataGrid;
public title: string = 'Document List';
public customers: Customer[];
public columns = [];
public alerts: Array<string> = [];
public messageBox: string;
public totalRows: number;
public currentPageNumber: number = 1;
public totalPages: number;
public pageSize: number;
public companyName: string;
public customerCode: string;
private sortDirection: string;
private sortExpression: string;
public autoFilter: Boolean;
public delaySearch: Boolean;
public runningSearch: Boolean;
constructor(private alertService: AlertService,
private customerService: CustomerService,
private router: Router,
private notificationService: NotificationService) {
this.currentPageNumber = 1;
this.autoFilter = false;
this.totalPages = 0;
this.totalRows = 0;
this.pageSize = 15;
this.sortDirection = "ASC";
this.sortExpression = "CompanyName";
}
public ngOnInit() {
this.columns.push(new DataGridColumn('customerCode', 'Date Filed', '[{"width": "9%" , "disableSorting": false}]'));
this.columns.push(new DataGridColumn('companyName', 'PO Name', '[{"width": "9%" , "hyperLink": true, "disableSorting": false}]'));
this.columns.push(new DataGridColumn('city', 'Document', '[{"width": "9%" , "disableSorting": false}]'));
this.columns.push(new DataGridColumn('zipCode', 'Service Type', '[{"width": "9%" , "disableSorting": false}]'));
this.columns.push(new DataGridColumn('dateUpdated', 'Case Number', '[{"width": "9%" , "disableSorting": false, "formatDate": true}]'));
this.columns.push(new DataGridColumn('zipCode', 'Status', '[{"width": "9%" , "disableSorting": false}]'));
this.columns.push(new DataGridColumn('dateUpdated', 'Status Date', '[{"width": "9%" , "disableSorting": false, "formatDate": true}]'));
this.executeSearch();
}
private executeSearch(): void {
if (this.runningSearch == true) return;
let miliseconds = 500;
if (this.delaySearch == false) {
miliseconds = 0;
}
this.runningSearch = true;
setTimeout(() => {
let customer = new Customer();
customer.customerCode = this.customerCode;
customer.companyName = this.companyName;
customer.pageSize = this.pageSize;
customer.sortDirection = this.sortDirection;
customer.sortExpression = this.sortExpression;
customer.currentPageNumber = this.currentPageNumber;
this.customerService.getCustomers(customer)
.subscribe(
response => this.getCustomersOnSuccess(response),
response => this.getCustomersOnError(response));
}, miliseconds)
}
private getCustomersOnSuccess(response: Customer): void {
let transactionalInformation = new TransactionalInformation();
transactionalInformation.currentPageNumber = this.currentPageNumber;
transactionalInformation.pageSize = this.pageSize;
transactionalInformation.totalPages = response.totalPages;
transactionalInformation.totalRows = response.totalRows;
transactionalInformation.sortDirection = this.sortDirection;
transactionalInformation.sortExpression = this.sortExpression;
this.customers = response.customers;
this.Grid.databind(transactionalInformation);
this.alertService.renderSuccessMessage(response.returnMessage);
this.messageBox = this.alertService.returnFormattedMessage();
this.alerts = this.alertService.returnAlerts();
this.runningSearch = false;
}
private getCustomersOnError(response): void {
this.alertService.renderErrorMessage(response.returnMessage);
this.messageBox = this.alertService.returnFormattedMessage();
this.alerts = this.alertService.returnAlerts();
this.runningSearch = false;
}
public datagridEvent(event) {
let datagridEvent: DataGridEventInformation = event.value;
if (datagridEvent.EventType == "PagingEvent") {
this.pagingCustomers(datagridEvent.CurrentPageNumber);
}
else if (datagridEvent.EventType == "PageSizeChanged") {
this.pageSizeChanged(datagridEvent.PageSize);
}
else if (datagridEvent.EventType == "ItemSelected") {
this.selectedCustomer(datagridEvent.ItemSelected);
}
else if (datagridEvent.EventType == "Sorting") {
this.sortCustomers(datagridEvent.SortDirection, datagridEvent.SortExpression);
}
}
private selectedCustomer(itemSelected: number) {
let rowSelected = itemSelected;
let row = this.customers[rowSelected];
let id = row.customerID;
let link = ['/customer', id];
this.router.navigate(link);
}
private sortCustomers(sortDirection: string, sortExpression: string) {
this.sortDirection = sortDirection;
this.sortExpression = sortExpression;
this.currentPageNumber = 1;
this.delaySearch = false;
this.executeSearch();
}
private pagingCustomers(currentPageNumber: number) {
this.currentPageNumber = currentPageNumber;
this.delaySearch = false;
this.executeSearch();
}
private pageSizeChanged(pageSize: number) {
this.pageSize = pageSize;
this.currentPageNumber = 1;
this.delaySearch = false;
this.executeSearch();
}
public reset(): void {
this.customerCode = "";
this.companyName = "";
this.currentPageNumber = 1;
this.delaySearch = false;
this.executeSearch();
}
public search(): void {
this.currentPageNumber = 1;
this.delaySearch = false;
this.executeSearch();
}
public companyNameChanged(newValue): void {
if (this.autoFilter == false) return;
if (newValue == "") return;
this.companyName = newValue;
this.currentPageNumber = 1;
this.delaySearch = true;
setTimeout(() => {
this.executeSearch();
}, 500)
}
public customerCodeChanged(newValue): void {
if (this.autoFilter == false) return;
if (newValue == "") return;
this.customerCode = newValue;
this.currentPageNumber = 1;
this.delaySearch = true;
setTimeout(() => {
this.executeSearch();
}, 500)
}
}
同样的方法在设备存储中正常工作
File dest = new File("storage/usbotg/NewFolder");
dest.mkdirs();
但不是usb存储，有什么建议吗？
该设备是Lenovo TAB2 A10-30。
答案 0 :(得分：2)
This Solution 仅编辑plattform.xml
/system/etc/permissions个文件
来自
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
</permission>
到
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_r" />
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>
保存文件然后重新启动，这也是SDCard的解决方案。