Можно ли вызвать создать объект AsyncTask в классе Fragment?
Как вызвать создать объект AsyncTask в классе Fragment?
У меня не получается. При попытке mt = new MyTask(); - ошибка:
No enclosing instance of type FragmentLayout.TitlesFragment is accessible. Must qualify the allocation with an enclosing instance of type FragmentLayout. TitlesFragment (e.g. x.new A() where x is an instance of FragmentLayout.TitlesFragment).
А вот это без ошибки: mt.execute();
Ведь, как я понимаю, класс Fragment не является UI Thread, а значит и вызывать объект AsyncTask из него нельзя? Наследованный от AsyncTask класс описан в классе Activity, а объект AsyncTask мне нужно вызвать из Fragment.
Код полностью:
FragmentLayout.java (см. класс MyTask)
package com.ftdi.javad2xxdemo;
import java.util.HashMap;
import java.util.Map;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.app.ListFragment;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Configuration;
import android.hardware.usb.UsbManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ScrollView;
import android.widget.TextView;
import com.ftdi.j2xx.D2xxManager;
//import com.ftdi.javad2xxdemo.DeviceUARTFragment.MyTask;
// my
import android.widget.Toast;
import android.app.ListActivity;
// end of mine
public class FragmentLayout extends Activity {
public static D2xxManager ftD2xx = null;
public static int currect_index = 0;
public static int old_index = -1;
private static Fragment currentFragment = null;
@Override
public void onCreate(Bundle savedInstanceState) {
try {
ftD2xx = D2xxManager.getInstance(this);
} catch (D2xxManager.D2xxException ex) {
ex.printStackTrace();
}
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_layout/*device_manager*/);
SetupD2xxLibrary();
/*
Context context = getApplicationContext();
Toast toast = Toast.makeText(context, "Hello toast!", Toast.LENGTH_LONG);
toast.show();
*/
IntentFilter filter = new IntentFilter();
filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
filter.setPriority(500);
this.registerReceiver(mUsbReceiver, filter);
}
@Override
protected void onDestroy() {
this.unregisterReceiver(mUsbReceiver);
super.onDestroy();
}
public static class DetailsActivity extends Activity {
Map<Integer, Fragment> act_map = new HashMap<Integer, Fragment>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getResources().getConfiguration().orientation
== Configuration.ORIENTATION_LANDSCAPE) {
// If the screen is now in landscape mode, we can show the
// dialog in-line with the list so we don't need this activity.
finish();
return;
}
if (savedInstanceState == null) {
// During initial setup, plug in the details fragment.
Fragment f = act_map.get(currect_index);
if (f == null)
{
switch (currect_index)
{
case 0:
f = new DeviceInformationFragment(this , ftD2xx);
break;
case 1:
f = new DeviceStatusFragment(this , ftD2xx);
break;
case 2:
f = new DevicePIDVIDFragment(this , ftD2xx);
break;
case 3:
f = new MiscFragment(this , ftD2xx);
break;
case 4:
f = new OpenDeviceFragment(this , ftD2xx);
break;
case 5:
f = new DeviceUARTFragment(this , ftD2xx);
break;
case 6:
f = new DeviceFileTransferFragment(this , ftD2xx);
break;
case 7:
f = new EEPROMFragment(this , ftD2xx);
break;
case 8:
f = new EEPROMUserAreaFragment(this , ftD2xx);
break;
case 9:
f = new FT4232HTestFragment(this , ftD2xx);
break;
case 10:
f = new FT2232HTestFragment(this , ftD2xx);
break;
case 11:
f = new RS232PinConfigFragment(this , ftD2xx);
break;
case 12:
f = new MPSEFragment(this , ftD2xx);
break;
case 13:
f = new FtdiEventFragment(this , ftD2xx);
break;
default:
f = new DetailsFragment();
break;
}
act_map.put(currect_index, f);
f.setArguments(getIntent().getExtras());
getFragmentManager().beginTransaction().add(android.R.id.content, f).commit();
}
currentFragment = f;
}
}
}
private void SetupD2xxLibrary () {
/*
PackageManager pm = getPackageManager();
for (ApplicationInfo app : pm.getInstalledApplications(0)) {
Log.d("PackageList", "package: " + app.packageName + ", sourceDir: " + app.nativeLibraryDir);
if (app.packageName.equals(R.string.app_name)) {
System.load(app.nativeLibraryDir + "/libj2xx-utils.so");
Log.i("ftd2xx-java","Get PATH of FTDI JIN Library");
break;
}
}
*/
// Specify a non-default VID and PID combination to match if required
if(!ftD2xx.setVIDPID(0x0403, 0xada1))
Log.i("ftd2xx-java","setVIDPID Error");
}
/**
* This is the "top-level" fragment, showing a list of items that the
* user can pick. Upon picking an item, it takes care of displaying the
* data to the user as appropriate based on the currrent UI layout.
*/
public static class TitlesFragment extends ListFragment {
boolean mDualPane;
int mCurCheckPosition = 0;
// int mDualPaneIndex = -1;
// public static D2xx ftD2xx;
// Context TitlesFragmentContext = this.;
Map<Integer, Fragment> map = new HashMap<Integer, Fragment>();
// public void setTitlesFragment(Context parentContext)
// {
// TitlesFragmentContext = parentContext;
// ftD2xx = ftdid2xx;
// }
public TitlesFragment() {
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// Populate list with our static array of titles.
setListAdapter(new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_activated_1, FtdiModeListInfo.TITLES));
/*
ArrayAdapter a = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_activated_1, FtdiModeListInfo.TITLES);
setListAdapter(a);
*/
// Check to see if we have a frame in which to embed the details
// fragment directly in the containing UI.
View detailsFrame = getActivity().findViewById(R.id.details);
mDualPane = detailsFrame != null && detailsFrame.getVisibility() == View.VISIBLE;
if (savedInstanceState != null) {
// Restore last state for checked position.
mCurCheckPosition = savedInstanceState.getInt("curChoice", 0);
}
if (mDualPane) {
// In dual-pane mode, the list view highlights the selected item.
getListView().setChoiceMode(AbsListView.CHOICE_MODE_SINGLE);
getListView().setVisibility(8); // GONE
// Make sure our UI is in the correct state.
showDetails(mCurCheckPosition);
}
}
class MyTask extends AsyncTask<String, Integer, Void> {
@Override
protected Void doInBackground(String... urls) {
publishProgress();
onProgressUpdate();
return null;
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
progressBar.incrementProgressBy(10);
//Toast.makeText(DeviceUARTContext, "AsyncTask", Toast.LENGTH_LONG).show();
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("curChoice", mCurCheckPosition);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
showDetails(position);
}
/**
* Helper function to show the details of a selected item, either by
* displaying a fragment in-place in the current UI, or starting a
* whole new activity in which it is displayed.
*/
void showDetails(int index) {
mCurCheckPosition = index;
currect_index = index;
// Log.i("FragmentLayout","index = " + Integer.toString(index));
// Log.i("FragmentLayout","mDualPaneIndex = " + Integer.toString(mDualPaneIndex));
if (mDualPane) {
// We can display everything in-place with fragments, so update
// the list to highlight the selected item and show the data.
getListView().setItemChecked(index, true);
Fragment f = map.get(index);
if (f == null) {
switch (index) {
case 0:
//f = new DeviceInformationFragment(getActivity() , ftD2xx);
//f = new DeviceManagerFragment(getActivity() , ftD2xx);
f = new DeviceUARTFragment(getActivity() , ftD2xx);
break;
case 1:
f = new DeviceStatusFragment(getActivity() , ftD2xx);
break;
case 2:
f = new DevicePIDVIDFragment(getActivity() , ftD2xx);
break;
case 3:
f = new MiscFragment(getActivity() , ftD2xx);
break;
case 4:
f = new OpenDeviceFragment(getActivity() , ftD2xx);
break;
case 5:
f = new DeviceUARTFragment(getActivity() , ftD2xx);
break;
case 6:
f = new DeviceFileTransferFragment(getActivity() , ftD2xx);
break;
case 7:
f = new EEPROMFragment(getActivity() , ftD2xx);
break;
case 8:
f = new EEPROMUserAreaFragment(getActivity() , ftD2xx);
break;
case 9:
f = new FT4232HTestFragment(getActivity() , ftD2xx);
break;
case 10:
f = new FT2232HTestFragment(getActivity() , ftD2xx);
break;
case 11:
f = new RS232PinConfigFragment(getActivity() , ftD2xx);
break;
case 12:
f = new MPSEFragment(getActivity() , ftD2xx);
break;
case 13:
f = new FtdiEventFragment(getActivity() , ftD2xx);
break;
default:
f = new DetailsFragment();
break;
}
map.put(index, f);
Bundle args = new Bundle();
args.putInt("index", index);
f.setArguments(args);
}
currentFragment = f;
if ( currect_index != old_index ) {
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.details, f);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
old_index = currect_index;
}
else
{
// Otherwise we need to launch a new activity to display
// the dialog fragment with selected text.
Intent intent = new Intent();
intent.setClass(getActivity(), DetailsActivity.class);
intent.putExtra("index", index);
startActivity(intent);
}
}
}
/**
* This is the secondary fragment, displaying the details of a particular
* item.
*/
public static class DetailsFragment extends Fragment {
/*
public static DetailsFragment newInstance(int index) {
DetailsFragment f = new DetailsFragment();
// Supply index input as an argument.
Bundle args = new Bundle();
args.putInt("index", index);
f.setArguments(args);
return f;
}
*/
public DetailsFragment() {
}
public int getShownIndex() {
return getArguments().getInt("index", -1);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
// We have different layouts, and in one of them this
// fragment's containing frame doesn't exist. The fragment
// may still be created from its saved state, but there is
// no reason to try to create its view hierarchy because it
// won't be displayed. Note this is not needed -- we could
// just run the code below, where we would create and return
// the view hierarchy; it would just never be used.
return null;
}
ScrollView scroller = new ScrollView(getActivity());
TextView text = new TextView(getActivity());
int padding = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
4, getActivity().getResources().getDisplayMetrics());
text.setPadding(padding, padding, padding, padding);
scroller.addView(text);
text.setText(FtdiModeListInfo.DIALOGUE[getShownIndex()]);
return scroller;
}
}
@Override
protected void onNewIntent(Intent intent)
{
String action = intent.getAction();
if(UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action))
{
switch (currect_index)
{
case 4:
((OpenDeviceFragment)currentFragment).notifyUSBDeviceAttach(intent);
break;
case 5:
((DeviceUARTFragment)currentFragment).notifyUSBDeviceAttach();
break;
case 7:
((EEPROMFragment)currentFragment).notifyUSBDeviceAttach();
break;
case 8:
((EEPROMUserAreaFragment)currentFragment).notifyUSBDeviceAttach();
break;
default:
break;
}
}
}
/***********USB broadcast receiver*******************************************/
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver()
{
@Override
public void onReceive(Context context, Intent intent)
{
String TAG = "FragL";
String action = intent.getAction();
if(UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action))
{
Log.i(TAG,"DETACHED...");
if (currentFragment != null)
{
switch (currect_index)
{
case 5:
((DeviceUARTFragment)currentFragment).notifyUSBDeviceDetach();
break;
default:
//((DeviceInformationFragment)currentFragment).onStart();
break;
}
}
}
}
};
}
DeviceUARTFragment.java (сокращён, весь не влазит). см. //mt = new MyTask(); //mt.execute(); в обработчике кнопки ReadDataBut
@SuppressLint("ValidFragment") public class DeviceUARTFragment extends Fragment{
// Empty Constructor
public DeviceUARTFragment()
{
}
/* Constructor */
public DeviceUARTFragment(Context parentContext , D2xxManager ftdid2xxContext)
{
DeviceUARTContext = parentContext;
ftdid2xx = ftdid2xxContext;
}
public int getShownIndex() {
return getArguments().getInt("index", 5);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ReadDataBut = (Button) view.findViewById(R.id.button12);
ReadDataBut.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
clickedButton = v.getId();
// пробудить Гобой
/*
9600бит/сек / 8 = 1200байт/сек
время пересылки 1-го байта: 1/1200 = 0,83мс
число циклов: 22сек / 0.83мс = 27000
минус время операции в for
*/
//progressBar = (ProgressBar) view.findViewById(R.id.progressBar1);
//progressBar.setProgress(33);
byte[] wakeUpCommand = {0x55};
for(int i=0; i<20000; i++)
{
ftDev.write(wakeUpCommand, wakeUpCommand.length);
}
//progressBar.setProgress(0);
//percent.setText("Считывание архива... ");
//try{
/*
}
catch( Exception e){
Toast.makeText(DeviceUARTContext, "e: "+e, Toast.LENGTH_SHORT).show();
}
*/
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
for (int i=0; i<packetIntervals.length; i++)
{
packetIntervals[i] = (char)(i*packetSize);
}
/*
addrCnt = 0;
sendRequest();
//fillArchive();
addrCnt++;
*/
for (int i=0; i<packetIntervals.length; i++)
{
readPacket[9] = (byte)(packetIntervals[i] & 0xFF);
readPacket[10] = (byte)((packetIntervals[i] >> 8) & 0xFF);
readPacket[readPacket.length - 1] = (byte)((getLRC(readPacket) >> 8) & 0xFF);
readPacket[readPacket.length - 2] = (byte)(getLRC(readPacket) & 0xFF);
ftDev.write(readPacket, readPacket.length);
try {
Thread.sleep(2500);
} catch (InterruptedException e) {
e.printStackTrace();
}
// посылка пришла
answ_buff_cnt = 0;
//mt = new MyTask();
//mt.execute();
if ( ((byte)((getLRC(answer_buffer) >> 8) & 0xFF) != answer_buffer[answer_buffer.length-1]) ||
((byte)(getLRC(answer_buffer) & 0xFF) != answer_buffer[answer_buffer.length-2]) )
{
Toast.makeText(DeviceUARTContext, "Ошибка принятых данных. Начните чтение ПЗУ снова", Toast.LENGTH_SHORT).show();
break;
}
byte[] pureData = new byte[packetSize];
System.arraycopy(answer_buffer, 9, pureData, 0, packetSize);
System.arraycopy(pureData, 0, archive, i*packetSize, packetSize);
//float percentDiscrete = 100/32;
//currentProgress = (int) (100 - (float) 100/progressCounter);
//progressBar.setProgress(30);
//percent.setText("Скачано: " + currentProgress);
//if (currentProgress == 32)
//{
// currentProgress = 1;
//}
//else
//{
// currentProgress++;
//}
}
// заполнение файла-контейнера ----------------------------------------------------
/*
fileContainer.add(archive);
fileContainer.remove(0);
try {
for (int i = 0; i<60; i++)
{
System.arraycopy(fileContainer.get(i), 0, _60_archives, archiveSize*i, archiveSize);
}
FileOutputStream fo = new FileOutputStream(file);
fo.write(_60_archives);
fo.close();
} catch (Exception e) {
// TODO Auto-generated catch block
Toast.makeText(DeviceUARTContext, "Exception "+e, Toast.LENGTH_LONG).show();
}
*/
byte[] pointer = {0};
try{
// чтение, модификация и запись указателя на файл-контейнер и файла-контейнера
if (periodCheckBox.isChecked())
{
selectedItemNum = EEPROMSSpinner.getSelectedItemPosition();
fileContainer.set(EEPROMSSpinner.getSelectedItemPosition(), archive);
}
else
{
FileInputStream pointerFileInput = new FileInputStream(pointerFile);
pointerFileInput.read(pointer);
pointerFileInput.close();
fileContainer.set(pointer[0], archive);
pointer[0]++;
if (pointer[0] == 60)
{
pointer[0] = 0;
}
FileOutputStream pointerFileOutput = new FileOutputStream(pointerFile);
pointerFileOutput.write(pointer[0]);
pointerFileOutput.close();
}
// запись обновлённого файла-контейнера
for (int i = 0; i<60; i++)
{
System.arraycopy(fileContainer.get(i), 0, _60_archives, archiveSize*i, archiveSize);
}
FileOutputStream fileOutput = new FileOutputStream(file);
fileOutput.write(_60_archives);
fileOutput.close();
// заполнение коллекции
for (int i = 0; i < 60; i++)
{
archive = Arrays.copyOfRange(_60_archives, i*archiveSize, i*archiveSize + archiveSize);
fileContainer.add(archive);
}
fillSpinner(v);
}
catch (Exception e) {
}
//----------------------------------------------------------------------------------
}
});
}
}
Источник: Stack Overflow на русском