我遇到了一个小问题。在我的Android登录活动中，我启动一个线程（定义我的会话的持续时间）。我想要的是，当我在一个不同的活动/类，我按下注销按钮，我应该停止执行倒计时的线程，并能够再次登录。
我知道打断其中的唯一方法是
Thread.currentThread().interrupt();
但是我不想打断当前线程，我想通过它的id中断线程，这可以通过getId（）来获取。
这是我的活动类代码：
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.AndroidApp.R;
import com.AndroidApp.domain.Utente;
import com.AndroidApp.pagine.MenuPagina;
public class LoginActivity extends Activity {
final String TAG = "LogIN";
ArrayList<HashMap<String, String>> mylist;
private Button bLogin, bExit;
private EditText utente, passwd;
private MediaPlayer mpButtonClick = null;
private SharedPreferences mPreferences;
public Thread sessionTimer;
public long tId = -1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
mPreferences = getSharedPreferences("CurrentUser", MODE_PRIVATE);
SharedPreferences.Editor editor = mPreferences.edit();
editor.clear();
editor.commit();
String nome = mPreferences.getString("nome", "Nessuno");
setTitle("Sessione di : " + nome);
Log.w("TotThreads", Integer.toString(Thread.activeCount()));
if (MenuPagina.reset){
Log.w("LogIn", "trying to interrupt");
//this is where im trying to interrypt the thread
MenuPagina.reset = false;
}
if (!checkLoginInfo()) {
mpButtonClick = MediaPlayer.create(this, R.raw.button);
bLogin = (Button)findViewById(R.id.bLogin);
bLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
mpButtonClick.start();
Log.v(TAG, "Trying to Login");
utente = (EditText)findViewById(R.id.etUtente);
passwd = (EditText)findViewById(R.id.etPassword);
String username = utente.getText().toString();
username = ("aaa@ffff.it");
String password = md5(passwd.getText().toString());
Log.v(TAG, password);
XMLFunctionsLogin.getInstance().setNewURL("u=" + username + "&p=" + password);
String xml = XMLFunctionsLogin.getXML();
Document doc = XMLFunctionsLogin.xmlFromString(xml);
int status = XMLFunctionsLogin.errStatus(doc);
Log.v("status", Integer.toString(status));
if ((status == 0)) {
NodeList nodes = doc.getElementsByTagName("login");
Element e = (Element) nodes.item(0);
Utente utente = new Utente();
utente.setIdUtente(XMLFunctionsLogin.getValue(e, "idUtente"));
utente.setNome(XMLFunctionsLogin.getValue(e, "nome"));
utente.setCognome(XMLFunctionsLogin.getValue(e, "cognome"));
Log.v("utente", utente.getCognome().toString());
Log.v(TAG, "5");
List<NameValuePair> nvps = new ArrayList<NameValuePair>(2);
nvps.add(new BasicNameValuePair("utente", username));
nvps.add(new BasicNameValuePair("password", password));
Log.v(TAG, nvps.get(0).toString());
Log.v(TAG, nvps.get(1).toString());
// Store the username and password in SharedPreferences after the successful login
SharedPreferences.Editor editor = mPreferences.edit();
editor.putString("userName", username);
editor.putString("password", password);
editor.putString("idUtente", utente.getIdUtente());
editor.putString("nome", utente.getNome());
editor.putString("cognome", utente.getCognome());
editor.commit();
Log.v(TAG, "Successo");
sessionTimer = new Thread() {
@Override
public void run() {
long tId = Thread.currentThread().getId();
Log.w("TTthread Id", Long.toString(tId));
for (int i = 30; i >= 0; i -= 1) {
if (i == 0) {
System.out.print("timer finito");
Log.i("Timer", "timer finito");
LoginActivity.this.runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(LoginActivity.this, "ti si è scaduta la sessione", Toast.LENGTH_LONG).show();
}
});
Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
//System.exit(0);
} try {
Thread.sleep(1000);
Log.i("Timer", Integer.toString(i));
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
finish();
}
}
}
};
sessionTimer.start();
Log.v(TAG, "Successo2");
/*
Counter timer = new Counter();
timer.start();
*/
Toast.makeText(LoginActivity.this, "LogIn con successo", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(LoginActivity.this, MenuPagina.class);
startActivity(intent);
} else {
final String errorMessage = XMLFunctionsLogin.errStatusDesc(doc);
Log.v("fallimento", errorMessage);
LoginActivity.this.runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(LoginActivity.this, errorMessage, Toast.LENGTH_LONG).show();
}
});
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
});
bExit = (Button)findViewById(R.id.bExit);
bExit.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
mpButtonClick.start();
finish();
}
});
}
}
//Checking whether the username and password has stored already or not
private final boolean checkLoginInfo() {
boolean username_set = mPreferences.contains("UserName");
boolean password_set = mPreferences.contains("PassWord");
if ( username_set || password_set ) {
return true;
}
return false;
}
//md5 for crypting and hash
private static String md5(String data) {
byte[] bdata = new byte[data.length()];
int i;
byte[] hash;
for (i = 0; i < data.length(); i++)
bdata[i] = (byte) (data.charAt(i) & 0xff);
try {
MessageDigest md5er = MessageDigest.getInstance("MD5");
hash = md5er.digest(bdata);
} catch (GeneralSecurityException e) {
throw new RuntimeException(e);
}
StringBuffer r = new StringBuffer(32);
for (i = 0; i < hash.length; i++) {
String x = Integer.toHexString(hash[i] & 0xff);
if (x.length() < 2)
r.append("0");
r.append(x);
}
return r.toString();
}
}
任何帮助将不胜感激。 谢谢！
答案 0 :(得分：2)
启动线程时，应保存Thread对象，然后在Thread对象上调用中断：
Thread thread = new Thread(yourRunnable);
thread.start();
...
thread.interrupt();
所以使用您刚刚添加的代码，您可以这样做：
sessionTimer.interrupt();
另外，请注意，中断线程只会导致sleep()和wait()调用抛出InterruptedException或设置线程中断标志。它将不阻止线程执行。这意味着您的线程应该使用如下代码：
// loop until we are interrupted
while (!Thread.currentThread().isInterrupted()) {
...
// if you use sleep or wait it should do:
try {
Thread.sleep(someMillis);
} catch (InterruptedException e) {
// if you are not quitting then you need to reset the interrupted flag
Thread.currentThread.interrupt();
// otherwise it is typical to quit the thread if interrupted
return;
}
}
因此，使用您刚刚发布的代码，当您正在睡觉时，您应该退出run()方法，这将停止该线程。
try {
Thread.sleep(1000);
Log.i("Timer", Integer.toString(i));
} catch (InterruptedException e) {
// quit because we were interrupted
return;
} finally {
finish();
}
另外，请记住，如果一个单独的主题在interrupt()上调用sessionTimer，则应将其标记为volatile。