嗨我有一个在片段A上运行的线程，当我调用第二个片段时，据说片段A必须调用方法onPause（），我停止线程，但是线程仍在运行，因为我有一个第一个片段上的吐司显示一条消息，如果我在片段A上的列表是空的，它在片段B上显示，让我粘贴你的代码：
片段A：
public class FragmentoPrincipalChofer extends ListFragment {
private List<ParseObject> mPedido;
private List<ParseObject> mViaje;
private List<ParseUser> mUrlUsuario;
private ListView mLista;
private Runnable r;
final Handler handler = new Handler();
private String mChoferActual;
private String mPassChofer;
private AdaptadorDatosListviewChofer adaptador;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View x = inflater.inflate(R.layout.fragmento_principal_chofer, container, false);
mLista = (ListView)x.findViewById(android.R.id.list);
SharedPreferences pref = getContext().getSharedPreferences("login", 0);
mChoferActual= pref.getString("usuario","");
mPassChofer= pref.getString("pass","");
ParseUser.logInInBackground(mChoferActual, mPassChofer, new LogInCallback() {
public void done(ParseUser user, ParseException e) {
if (user != null) {
// Hooray! The user is logged in.
} else {
// Signup failed. Look at the ParseException to see what happened.
}
}
});
return x;
}
@Override
public void onResume() {
super.onResume();
// logica de recibir pedidos
final ProgressDialog dialogoProgreso = new ProgressDialog(getContext());
dialogoProgreso.setTitle("Cargando");
dialogoProgreso.setMessage("Buscando Pedidos");
dialogoProgreso.setCancelable(false);
dialogoProgreso.show();
r = new Runnable() {
public void run() {
handler.postDelayed(r, 10000);
//obtener pedido de taxi
ParseQuery<ParseObject> query = ParseQuery.getQuery("Pedido");
query.whereEqualTo("chofer", mChoferActual);
query.addDescendingOrder("createdAt");
query.findInBackground(new FindCallback<ParseObject>() {
public void done(List<ParseObject> pedido, com.parse.ParseException e) {
if (e == null) {
if(pedido.size()==0){
dialogoProgreso.cancel();
Toast.makeText(getContext(), "prueba", Toast.LENGTH_LONG).show();
}else{
dialogoProgreso.cancel();
mPedido = pedido;
String[] nombreUsuarios = new String[mPedido.size()];
int i = 0;
for (ParseObject pedidos : mPedido) {
nombreUsuarios[i] = pedidos.getString("cliente");
i++;
}
adaptador = new AdaptadorDatosListviewChofer(getListView().getContext(), mPedido);
setListAdapter(adaptador);
}
} else {
}
}
});
}
};
r.run();
ClickPedido();
}
// manejo de click sobre el pedido de taxi
public void ClickPedido() {
mLista.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
final String clienteSeleccionado = mPedido.get(position).get("cliente").toString();
AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
builder.setTitle("Confirmacion de pedido")
.setMessage("Esta seguro que desea tomar el pedido de " + clienteSeleccionado)
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
adaptador.remove(mPedido.get(position));
adaptador.notifyDataSetChanged();
ParseQuery<ParseObject> query2 = ParseQuery.getQuery("Pedido");
query2.whereEqualTo("cliente", clienteSeleccionado);
query2.getFirstInBackground(new GetCallback<ParseObject>() {
public void done(ParseObject chofer, ParseException e) {
if (chofer == null) {
Toast.makeText(getContext(), e.getMessage(), Toast.LENGTH_LONG).show();
} else {
try {
ParseObject viaje = new ParseObject("Viaje");
viaje.put("chofer", mChoferActual);
viaje.put("cliente", chofer.get("cliente").toString());
viaje.saveInBackground();
chofer.delete();
chofer.saveInBackground();
Fragment fragment2 = new MapaChofer();
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
transaction.replace(R.id.prueba2, fragment2).addToBackStack(null);
transaction.commit();
} catch (ParseException e1) {
e1.printStackTrace();
}
}
}
});
}
}
)
.setNegativeButton("CANCELAR",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
}
}
);
builder.show();
}
}
);
}
@Override
public void onPause() {
super.onPause();
handler.removeCallbacks(r);
}
}
主要抽屉管理碎片：
public class DrawerPrincipal extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener,FragmentoPrincipalUsuario.OnFragmentInteractionListener {
private ParseFile mPrueba;
private Uri url;
private ImageView imagen;
private DrawerLayout mDrawerLayout;
private String mUsuarioActual;
public static final int CHOOSE_PIC_REQUEST_CODE = 1;
private Uri mMediaUri;
private ImageView mImagenPrevia;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawer_principal);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
SharedPreferences pref = getApplicationContext().getSharedPreferences("login", 0);
mUsuarioActual= pref.getString("usuario","");
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
View hView = navigationView.inflateHeaderView(R.layout.nav_header_drawer_principal);
final ImageView imgvw = (ImageView)hView.findViewById(R.id.imagenPerfil);
final TextView tv = (TextView)hView.findViewById(R.id.nombreUsuarioV);
//Picasso.with(getBaseContext()).load(url.toString()).into(imgvw);
tv.setText("new text");
ParseQuery<ParseUser> query3 = ParseUser.getQuery();
query3.whereEqualTo("username",mUsuarioActual);
query3.findInBackground(new FindCallback<ParseUser>() {
public void done(List<ParseUser> usuario, ParseException e) {
if (e == null) {
mPrueba = usuario.get(0).getParseFile("foto");
tv.setText(usuario.get(0).getUsername().toString());
url = Uri.parse(mPrueba.getUrl());
Picasso.with(getBaseContext()).load(url.toString()).transform(new RoundedTransformation(300, 4)).into(imgvw);
if (usuario.get(0).get("tipoUsuario").toString().equals("pasajero")) {
Fragment fragmento;
fragmento = new FragmentoPrincipalUsuario();
getSupportFragmentManager().beginTransaction()
.replace(R.id.content_main, fragmento)
.commit();
}else {
Fragment fragmento;
fragmento = new FragmentoPrincipalChofer();
getSupportFragmentManager().beginTransaction()
.replace(R.id.content_main, fragmento)
.commit();
}
} else {
// Something went wrong.
}
}
});
}
@Override
public void onBackPressed() {
DrawerLayout layout = (DrawerLayout)findViewById(R.id.drawer_layout);
if (layout.isDrawerOpen(GravityCompat.START)) {
layout.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
/*
if(getSupportFragmentManager().getBackStackEntryCount()!=0) {
getSupportFragmentManager().popBackStack();
}else{
super.onBackPressed();
}*/
}
/*
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.pantalla_principal_usuario, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
*/
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.cuenta) {
Fragment fragmento;
fragmento = new OpcionDrawerUsuario();
getSupportFragmentManager().beginTransaction()
.replace(R.id.content_main, fragmento)
.addToBackStack(null)
.commit();
} else if (id == R.id.historial_viajes) {
Fragment fragmento;
fragmento = new FragmentoViajesAcumulados();
getSupportFragmentManager().beginTransaction()
.replace(R.id.content_main, fragmento)
.addToBackStack(null)
.commit();
} else if (id == R.id.contacto) {
String emailAdress[] = {"gastondelacruz@gmail.com"};
Intent email= new Intent(Intent.ACTION_SEND);
email.putExtra(Intent.EXTRA_EMAIL,emailAdress);
email.putExtra(Intent.EXTRA_SUBJECT,"Pon aqui el motivo de tu mail");
email.setType("text/plain");
email.putExtra(Intent.EXTRA_TEXT,"Su mensaje");
startActivity(email);
} else if (id == R.id.compartir) {
String texto="https://www.google.com.ar/?gfe_rd=cr&ei=9JuBVvmcGanX8gejsK_4CA&gws_rd=ssl";
Intent intento= new Intent();
intento.setAction(Intent.ACTION_SEND);
intento.putExtra(Intent.EXTRA_TEXT, texto);
intento.setType("text/plain");
startActivity(intento);
} else if (id == R.id.version) {
String prueba="aceptar";
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("prueba") //
.setMessage("Esta es una prueba todavia no poseo el numero de version del producto") //
.setPositiveButton(prueba, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// TODO
dialog.dismiss();
}
}); //
builder.show();
} else if (id == R.id.salir) {
AlertDialog.Builder builder = new AlertDialog.Builder(DrawerPrincipal.this);
builder.setTitle("Cerrar Sesion")
.setMessage("Esta seguro que desea cerrar sesion actual?")
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
ParseUser.logOut();
Intent intento = new Intent(getApplicationContext(), ActividadLogin.class);
intento.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intento.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intento);
finish();
}
}
)
.setNegativeButton("CANCELAR",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
}
}
);
builder.show();
}
DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);mDrawerLayout.closeDrawer(GravityCompat.START);
return true;
}
}
答案 0 :(得分：0)
你实际上没有在片段A中运行一个线程。你创建了一个Runnable并调用了它的run方法，这使它在当前线程中立即执行。然后它使用Handler重新安排自己。您的处理程序也在针对主线程安排工作，在这种情况下这是默认的。
很难说你在这里尝试做什么，代码格式不好，但我很确定你不想调用r.run（）来立即调用Runnable。