请问如何解决这个线程问题
package com.example.xianrz;import java.util.HashMap;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;
import org.json.JSONObject;
import com.
import com.ab.util.ParseJson2BeanUtils;
import
import singleton.HttpServiceSingleton;
import database.DataBaseHelper;
import entity.Constant;
import entity.LoginUser;
import entity.MyApplication;
import kuangjia.AbActivity;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class DengLu extends AbActivity{
private MyApplication application;
private Button denglu = null;
private Button zhuce = null;
private String userName = "";
private String password = "";
private EditText usernameEt = null;
private EditText passwordEt = null;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.login_main);
super.getIntent();
this.denglu = (Button) this.findViewById(R.id.login);
this.zhuce = (Button) this.findViewById(R.id.zucebut);
this.usernameEt = (EditText) this.findViewById(R.id.username);
this.passwordEt = (EditText) this.findViewById(R.id.password);
this.zhuce.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
Intent it=new Intent(DengLu.this,ZhuCe.class);
startActivity(it);
}
});
this.denglu.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
userName = usernameEt.getText() + "";
password = passwordEt.getText() + "";
if(login()){
Intent intent = new Intent(DengLu.this,Home.class);
DengLu.this.startActivity(intent);
}else{
if(!NetworkUtil.checkNetwork(DengLu.this)) {
DengLu.this.showToast("登录失败,没有可用的网络");
return;
}
DengLu.this.showToast("登录失败,请确认用户名密码正确!");
}
}
});
}
private boolean login(){
Boolean flag=false;
DataBaseHelper db=null;
try{
Map<String, String> lp = new HashMap<String, String>();
lp.put("username", userName);
lp.put("password", password);
String str="";
db = new DataBaseHelper(DengLu.this);
try {
new Thread(new Runnable() {
@Override
public void run() {
str = HttpServiceSingleton
.getInstance()
.getHttpServiceImpl()
.executePostS(
Constant.HTTP_Home
+ Constant.HTTP_LOGINS, lp);
}
}).start();
Toast.makeText(getApplicationContext(), str,Toast.LENGTH_LONG);
if (str == null || str.length() < 1 || str == "") {
return false;
}
str = str.replaceAll("\ufeff", "");
if (str.length() > 0) {
JSONObject loginJs = new JSONObject(str);
String isSucceed = loginJs.get("success") + "";
if ("false".equals(isSucceed)) {
DengLu.this.showToast(loginJs.get("msg") + "");
flag= false;
} else {
JSONObject params = new JSONObject(loginJs
.get("o") + "");
LoginUser user = ParseJson2BeanUtils
.parseJson2Bean(params, LoginUser.class);
DengLu.this.showToast("登录成功");
db.getWritableDatabase().execSQL(
"delete from "+ Constant.TABLE_BASE_NAME);
ContentValues cv = new ContentValues();
cv.put("USERNAME", params.get("username").toString());
cv.put("COMPNAME", params.get("compName").toString());
cv.put("USERID", params.get("userid").toString());
cv.put("PASSWORD", passwordEt.getText() + "");
try {
application.setLoginUser(user);
} catch (Exception e) {
e.printStackTrace();
}
setResult(RESULT_OK, getIntent());
return true;
}
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "网络异常!",
Toast.LENGTH_LONG).show();
}finally{
db.close();
}
}catch(Exception e){
e.printStackTrace();
}finally{
if(db!=null){
db.close();
}
}
return flag;
}
private static Boolean isExit = false;
private static Boolean hasTask = false;
public static Object ma;
Timer tExit = new Timer();
TimerTask task = new TimerTask() {
@Override
public void run() {
isExit = true;
hasTask = true;
}
};
private AbImageDownloadQueue mAbImageDownloadQueue;
// 退出事件
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (isExit == false) {
isExit = true;
Toast.makeText(this, "再按一次关闭"+getResources().getString(R.string.app_name), Toast.LENGTH_SHORT).show();
if (!hasTask) {
tExit.schedule(task, 2000);
}
} else {
finish();
System.exit(0);
}
}
return false;
}
}