Android中UI线程与子线程的通信

private Handler mHandler=new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SUCCESS_NUMBER:{
//通过getData函数得到通过消息机制获取到的数据
 Bundle bundle=msg.getData();
versionName=bundle.getString("versionName");
versionCode=bundle.getString("versionCode");
versionDes=bundle.getString("versionDes");
updatePath=bundle.getString("updatePath");
//建议得到的数据仅限于handleMessage这个函数中使用，因为线程执行顺序无法预测
 checkVersion();
}break;
}
}
};

new Thread(){
@Override
public void run() {
String path="http://10.25.13.155/update/updateInfo.json";
try {
URL url=new URL(path);
HttpURLConnection connection= (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
if(connection.getResponseCode()==200){
InputStream is=connection.getInputStream();
String info= StreamUtil.getInfo(is);
if(info!=null){
Message message= Message.obtain();
//Bundle 相当于Map,用来存储键值对
Bundle bundle=new Bundle();
JSONObject jsonObject=new JSONObject(info);
versionName = jsonObject.getString("versionName");
versionCode = jsonObject.getString("versionCode");
versionDes = jsonObject.getString("versionDes");
updatePath = jsonObject.getString("updatePath");
bundle.putString("versionName",versionName);
bundle.putString("versionCode",versionCode);
bundle.putString("versionDes",versionDes);
bundle.putString("updatePath",updatePath);
message.setData(bundle);
message.what=SUCCESS_NUMBER;
//延时跳转
long endTime=SystemClock.currentThreadTimeMillis();
if((endTime-startTime)<5000){
SystemClock.sleep(5000-(endTime-startTime));
}
//将信息通过消息机制传送到UI线程
mHandler.sendMessage(message);
}else{
Log.i("联网失败","未获得信息");
}
}else{
Log.i("联网信息","未取得链接");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();

private void checkVersion(){
if(mLocalVersionCode<Integer.parseInt(versionCode)){
Log.i("比较成功是否更新","是"+versionCode);
}else {
Intent intent=new Intent(this,IndexActivity.class);
startActivity(intent);
finish();
}
}