安卓Service向Activity传递数据，更新UI

接口回调、Handler、活动和服务绑定

1服务：执行定时任务，发起网络请求定位，请求到的结果传递到活动，在地图上展示。

2活动关键代码：

绑定服务后会获取LocationService.LocationBinder对象，在此处调用getLocationService()方法获取Service实例，service设置回调接口获取位置信息，并发送消息，handler接收消息后更新UI。

//绑定服务

private LocationService  service;
private ServiceConnection serviceConnection=new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder iBinder) {
service=((LocationService.LocationBinder)iBinder).getLocationService();
service.setDataCallback(new LocationService.DataCallback() {
@Override
public void updateui(LocationInfo locationInfo) {
Message message=new Message();
message.what=LocationService.UpdateLocation;
message.obj=locationInfo;
handler.sendMessage(message);

}
});
}
@Override
public void onServiceDisconnected(ComponentName name) {

}
};

//handler处理消息更新UI
public  Handler handler=new Handler(){
public void handleMessage(Message message){
switch (message.what){
case LocationService.UpdateLocation:
//更新UI
sLocationInfo=(LocationInfo)message.obj;
baiduMapUtil.showAtLocation(sLocationInfo);
baiduMapUtil.mBaiduMap.clear();
baiduMapUtil.addOverLay(sLocationInfo);
baiduMapUtil.GeoCode(sLocationInfo);
baiduMapUtil.setGeoCallback(new BaiduMapUtil.Geocallback() {
@Override
public void geo(String address) {
sLocationInfo.setAddress(address);
baiduMapUtil.showInfoWindow(sLocationInfo);
}

@Override
public void Poi(List<HospitalInfo> list) {

}
});
break;
}
}
};

public class LocationService extends Service {
public static final int UpdateLocation=1;//更新UI
private LocalDB localDB;
private List<People> peoples;
private People mCurrentPeople;
private String mCurrentUserId;
public LocationInfo locationInfo;
private DataCallback dataCallback=null;
public LocationService() {
}
private LocationBinder mBinder=new LocationBinder();

@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
@Override
public void onCreate(){
super.onCreate();
localDB=new LocalDB(this);
peoples=localDB.getMemberList();
mCurrentPeople=peoples.get(0);
mCurrentUserId=mCurrentPeople.getUserid();
}

@Override
public int onStartCommand(Intent intent,int flags,int startId){
//自定义的异步定时任务从网络请求定位，获取经纬度，没隔10秒请求一次
new MyTask().execute(mCurrentUserId,"0",new Date().getTime()+"");
AlarmManager manager=(AlarmManager)getSystemService(ALARM_SERVICE);
int anHour=60*60*1000;
long triggerAtTime= SystemClock.elapsedRealtime()+10*1000;
Intent i=new Intent(this, LocationReceiver.class);
PendingIntent                pendingIntent=PendingIntent.getBroadcast(this,0,i,0);
manager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,triggerAtTime,pendingIntent);
return super.onStartCommand(intent,flags,startId);
}
//定义Binder，获取服务实例
public class LocationBinder extends Binder {

public LocationService getLocationService(){
return LocationService.this;
}
}
//自定义异步任务
class MyTask extends AsyncTask<String,Integer,LocationInfo>{

@Override
protected LocationInfo doInBackground(String... params) {
//            String userId=params[0];
try {
locationInfo= HttpRequestMethods.getLocation(new PostParameter[]{
new PostParameter("userId", params[0]), new PostParameter("startTime", params[1]),
new PostParameter("endTime", params[2]), new PostParameter("type", "normal")});
} catch (JSONException e) {
e.printStackTrace();
}
return locationInfo;
}

@Override
protected void onPostExecute(LocationInfo locationInfo) {
if(locationInfo!=null){
Log.d("chenmeng9202", locationInfo.getLongitude() + "");
localDB.query("insert or ignore into location_table(user_id,latitude,longitude,time)values(?,?,?,?)",
new String[]{mCurrentUserId, locationInfo.getLatitude() + "", locationInfo.getLongitude() + "", locationInfo.getTime()});
//回调
dataCallback.updateui(locationInfo);
}
}
}
//设置接口
public void setDataCallback(DataCallback dataCallback){
this.dataCallback=dataCallback;
}
//自定义回调接口
public interface DataCallback{
void updateui(LocationInfo locationInfo);
}
}

2TripAvtivity完整代码
public class TripActivity extends ToolBarActivity implements View.OnClickListener {
private final static String TAG=TripActivity.class.getSimpleName();
private MapView mapView;
private BaiduMapUtil baiduMapUtil;//地图工具类
private Button btchangeMember;

private Button btDail;
private Button btSearchHospital;
private Button btSearchTrack;
private Button btTripRecord;
private Button btFence;

private static final int SEARCH_TYPE_CITY = 0;
private static final int SEARCH_TYPE_BOUND = 1;
private static final int SEARCH_TYPE_NEARBY = 2;

private List<People> peoples;
private LocalDB localDB;
private String mCurrentUserId;
private People mCurrentPeople;//当前成员
private LocationInfo mLocationInfo;//当前定位信息

private HospitalInfo hospitalInfo;
private int switch_index;

public  Handler handler=new Handler(){
public void handleMessage(Message message){
switch (message.what){
case LocationService.UpdateLocation:
//更新UI
sLocationInfo=(LocationInfo)message.obj;
baiduMapUtil.showAtLocation(sLocationInfo);
baiduMapUtil.mBaiduMap.clear();
baiduMapUtil.addOverLay(sLocationInfo);
baiduMapUtil.GeoCode(sLocationInfo);
baiduMapUtil.setGeoCallback(new BaiduMapUtil.Geocallback() {
@Override
public void geo(String address) {
sLocationInfo.setAddress(address);
baiduMapUtil.showInfoWindow(sLocationInfo);
}

@Override
public void Poi(List<HospitalInfo> list) {

}
});
break;
}
}
};

private LocationInfo sLocationInfo;//服务传回的定位信息
private LocationService  service;
private ServiceConnection serviceConnection=new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder iBinder) {
service=((LocationService.LocationBinder)iBinder).getLocationService();
service.setDataCallback(new LocationService.DataCallback() {
@Override
public void updateui(LocationInfo locationInfo) {
Message message=new Message();
message.what=LocationService.UpdateLocation;
message.obj=locationInfo;
handler.sendMessage(message);

}
});
//更新UI

}
@Override
public void onServiceDisconnected(ComponentName name) {

}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SDKInitializer.initialize(getApplicationContext());
setContentView(R.layout.activity_trip);
localDB=new LocalDB(this);
peoples=localDB.getMemberList();
initView();
initData();
new LocationTask().execute(mCurrentUserId, "0", new Date().getTime() + "");
Intent bindIntent=new Intent(this,LocationService.class);
startService(bindIntent);
bindService(bindIntent, serviceConnection, BIND_AUTO_CREATE);
}

private void initData() {
if(peoples!=null&&peoples.size()>0){
mCurrentPeople=peoples.get(0);
mCurrentUserId=peoples.get(0).getUserid();
btchangeMember.setText(peoples.get(0).getUsername());
}
}

private void initView() {
Toolbar toolbar = getToolBar();
((TextView) toolbar.findViewById(R.id.tv_title)).setText("摔倒监护");
btchangeMember=(Button)findViewById(R.id.changeMember);
btchangeMember.setOnClickListener(this);
mapView = (MapView) findViewById(R.id.map_view);
baiduMapUtil=new BaiduMapUtil(getApplicationContext(),mapView);
//底部菜单按钮
btDail=(Button)findViewById(R.id.trip_dail);
btDail.setOnClickListener(this);
btSearchHospital = (Button) findViewById(R.id.search_hospital);
btSearchHospital.setOnClickListener(this);
btSearchTrack = (Button) findViewById(R.id.search_track);
btSearchTrack.setOnClickListener(this);
btTripRecord = (Button) findViewById(R.id.trip_record);
btTripRecord.setOnClickListener(this);
btFence=(Button)findViewById(R.id.trip_fence);
btFence.setOnClickListener(this);
}

@Override
protected void onStart() {
super.onStart();
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case 1:
if (resultCode == RESULT_OK) {
Bundle b = data.getExtras();
hospitalInfo = (HospitalInfo) b.getSerializable("hospitalInfo");
baiduMapUtil.showAtLocation(hospitalInfo);
baiduMapUtil.addOverLay(hospitalInfo);
baiduMapUtil.GeoCode(hospitalInfo);
baiduMapUtil.setGeoCallback(new BaiduMapUtil.Geocallback() {
@Override
public void geo(String address) {
hospitalInfo.setPoiadd(address);
baiduMapUtil.showInfoWindow(hospitalInfo);
}

@Override
public void Poi(List<HospitalInfo> list) {

}
});
baiduMapUtil.setNavigation(new BaiduMapUtil.Navigation() {
@Override
public void navigation(HospitalInfo hospitalInfo) {
Intent intent=new Intent(TripActivity.this,NavigationActivity.class);
intent.putExtra("hospitalinfo",hospitalInfo);
intent.putExtra("lacationinfo",mLocationInfo);
startActivity(intent);
}
});
}
break;
default:
break;
}
}

@Override
protected void onStop() {
super.onStop();
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.trip_dail:
String mCurrentPhone= mCurrentPeople.getPhone();
if(mCurrentPhone!=null) {
Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:"+mCurrentPeople.getPhone()));
TripActivity.this.startActivity(intent);
}else{
ToastShow.ShortToast(getApplicationContext(),"当前成员未绑定手机");
}
break;
case R.id.search_hospital:
LatLng latLng=new LatLng(mLocationInfo.getLatitude(),mLocationInfo.getLongitude());
Log.d("latLng",latLng.latitude+"");
baiduMapUtil.searchByType(SEARCH_TYPE_CITY, latLng);
baiduMapUtil.setGeoCallback(new BaiduMapUtil.Geocallback() {
@Override
public void geo(String address) {
}

@Override
public void Poi(List<HospitalInfo> list) {
Log.d("chenmeng","poi");
Intent intent = new Intent(TripActivity.this, HospitalActivity.class);
intent.putExtra("poiResult", (Serializable)list);
startActivityForResult(intent, 1);
}
});

break;
case R.id.search_track:
Intent intenttrack=new Intent(TripActivity.this,TrackActivity.class);
startActivity(intenttrack);
break;
case R.id.trip_record:
Intent intent=new Intent(TripActivity.this,FallRecordActivity.class);
startActivity(intent);
break;
case R.id.trip_fence:
Intent intentfence=new Intent(TripActivity.this,FenceActivity.class);
startActivity(intentfence);
break;

/**
case R.id.bt_map_pattern:
if(mCurrentMode==MyLocationConfiguration.LocationMode.NORMAL){
mCurrentMode= MyLocationConfiguration.LocationMode.FOLLOWING;
btMapPattern.setText("跟随");
}else{
if( mCurrentMode== MyLocationConfiguration.LocationMode.FOLLOWING) {
mCurrentMode = MyLocationConfiguration.LocationMode.COMPASS;
btMapPattern.setText("罗盘");
}else {
if(mCurrentMode==MyLocationConfiguration.LocationMode.COMPASS) {
mCurrentMode = MyLocationConfiguration.LocationMode.NORMAL;
btMapPattern.setText("普通");
}
}
}
break;
**/
case R.id.changeMember: {
final int[] inner_which = {0};
//切换成员
if (peoples != null) {
final String[] name_list = new String[peoples.size()];
final String[] userId_list = new String[peoples.size()];
for (int i = 0; i < peoples.size(); i++) {
name_list[i] = peoples.get(i).getUsername();
userId_list[i] = peoples.get(i).getUserid();
}
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("成员列表");
builder.setSingleChoiceItems(name_list, 0, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch_index = which;
inner_which[0] = which;
}
});
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
if (inner_which[0] != 0) {
mCurrentPeople=peoples.get(switch_index);
mCurrentUserId = userId_list[switch_index];
btchangeMember.setText(name_list[switch_index]);
}else {
mCurrentPeople=peoples.get(switch_index);
mCurrentUserId = userId_list[0];
btchangeMember.setText(name_list[0]);
}
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.create().show();
} else {
ToastShow.ShortToast(this, "暂无成员");
}
}
default:
break;
}
}

class LocationTask extends AsyncTask<String,Integer,LocationInfo>{
@Override
protected LocationInfo doInBackground(String... params) {
String userId=params[0];
LocationInfo locationInfo=null;

try {
locationInfo= HttpRequestMethods.getLocation(new PostParameter[]{
new PostParameter("userId",params[0]),new PostParameter("startTime",params[1]),
new PostParameter("endTime",params[2]),new PostParameter("type","normal")});
} catch (JSONException e) {
e.printStackTrace();
}

return locationInfo;
}
@Override
protected void onPostExecute(LocationInfo locationInfo){
mLocationInfo=locationInfo;
baiduMapUtil.showAtLocation(locationInfo);
baiduMapUtil.addOverLay(locationInfo);
baiduMapUtil.GeoCode(locationInfo);
baiduMapUtil.setGeoCallback(new BaiduMapUtil.Geocallback() {
@Override
public void geo(String address) {
mLocationInfo.setAddress(address);
baiduMapUtil.showInfoWindow(mLocationInfo);

}
@Override
public void Poi(List<HospitalInfo> list) {
}
});
//存数据库
localDB.execSQL("insert or ignore into location_table(user_id,latitude,longitude,time) values" +
"(?,?,?,?)",new String[]{mCurrentUserId,locationInfo.getLatitude()+"",locationInfo.getLongitude()+"",locationInfo.getTime()});
}
OnGetGeoCoderResultListener geoListener=new OnGetGeoCoderResultListener() {
@Override
public void onGetGeoCodeResult(GeoCodeResult geoCodeResult) {
String address = geoCodeResult.getAddress();
LatLng latLng = geoCodeResult.getLocation();
mLocationInfo.setAddress(address);
Log.d(TAG,mLocationInfo.getAddress());
baiduMapUtil.showInfoWindow(mLocationInfo);
}

@Override
public void onGetReverseGeoCodeResult(ReverseGeoCodeResult reverseGeoCodeResult) {
}

};

}
}