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我目前正在使用外部數據庫處理帶有web服務的android應用程序。該應用程序由多個任務組成，每個任務分配給每個攝像機ID。每臺攝像機都具有存儲在數據庫中的特定長/經度。所以現在當我選擇一個特定的任務時，會有一個指導按鈕，將用戶當前位置顯示爲谷歌地圖中的一個標記。我想在谷歌地圖上顯示任務的長/緯度作爲標記，所以會有2個標記。只需要一些有關android編碼的幫助。任何幫助，將不勝感激！如何在Google地圖v2上顯示緯度/長度標記android
GoogleMapActivity.java
public class GoogleMapActivity extends Activity implements LocationListener {
GoogleMap map;
private String cameraid;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_google_map);
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
}
@Override
public void onLocationChanged(Location location) {
map.clear();
MarkerOptions mp = new MarkerOptions();
mp.position(new LatLng(location.getLatitude(), location.getLongitude()));
mp.title("My Current Location");
map.addMarker(mp);
map.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(), location.getLongitude()), 16));
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
AcceptTask.java
public class AcceptTask extends SherlockActivity {
private static String sendingURL,
url,
imageURL,
dateTimeP,
notificationID,
cameraID;
private String check = null;
// JSON Node names
private static final String TAG_GET = "jobViewResult",
TAG_IMAGEURL = "imageurl",
TAG_MESSAGE = "vmessage",
TAG_GETA = "assignResult",
TAG_STATUS = "assignStatus";
private ProgressDialog pDialog;
public static final int progress_bar_type = 0;
private TextView tvCamera, tvDate;
private ImageView my_image;
// contacts JSONObject
JSONObject api = null;
private long userInteractionTime = 0;
AsyncTask<Void, Void, Void> mRegisterTask;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_accept_task);
tvCamera = (TextView) findViewById(R.id.tv_CameraID);
tvDate = (TextView) findViewById(R.id.tv_DateR);
my_image = (ImageView) findViewById(R.id.img_Task);
//set the icon clickable
getSupportActionBar().setHomeButtonEnabled(true);
//add an < arrow on the icon
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
File file = new File("/sdcard/LocationSystem/pendingtask_temp.jpg");
if (file.exists()) {
file.delete();
}
if(isNetworkConnected()){
try{
// getting intent data
Intent intent = getIntent();
/** Get values from previous intent */
dateTimeP = intent.getStringExtra("TAG_IMAGE_TIME_DATE_P");
cameraID = intent.getStringExtra("TAG_CAMERA_ID_P");
notificationID = intent.getStringExtra("TAG_NOTIFICATION_ID");
/** Display cameraID and date time */
tvCamera.setText(cameraID);
tvDate.setText(dateTimeP);
url = "url";
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
try {
api = json.getJSONObject(TAG_GET);
check = api.getString(TAG_MESSAGE);
// Storing each json item in variable
imageURL = api.getString(TAG_IMAGEURL);
} catch (JSONException e) {
e.printStackTrace();
}
if(check.equals("Job available")){
new DownloadImageTask().execute(imageURL);
}else{
AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(this, R.style.AlertDialogTheme));
builder.setCancelable(false);
builder.setTitle("Job Unavailable");
builder.setMessage(check);
// Setting Icon to Dialog
builder.setIcon(R.drawable.ic_action_error);
builder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent loadIntent = new Intent();
loadIntent.putExtra("startUpdate_PList", "start");
setResult(Activity.RESULT_OK, loadIntent);
finish();
}
});
builder.show();
}
} catch(Exception e) {
if(e != null) {
showServerErrorDialog();
}
}
}else{showNetworkErrorDialog();}
}
private void showServerErrorDialog(){
AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(this, R.style.AlertDialogTheme));
builder.setCancelable(false);
builder.setTitle("Server Error");
builder.setMessage("Server is currently unable to connect. Please check your network connectivity.");
// Setting Icon to Dialog
builder.setIcon(R.drawable.ic_action_error);
builder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
builder.show();
}
private void showNetworkErrorDialog(){
AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(this, R.style.AlertDialogTheme));
builder.setTitle("No Network Connection");
builder.setMessage("Please turn on your mobile 3G or connect to a network in order to use this application.");
// Setting Icon to Dialog
builder.setIcon(R.drawable.ic_action_error);
builder.setPositiveButton("Close",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
AcceptTask.this.finish();
}
});
builder.setNegativeButton("Setting",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//calling setting menu
startActivityForResult(new Intent(android.provider.Settings.ACTION_SETTINGS), 0);
}
});
builder.show();
}
private boolean isNetworkConnected() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni = cm.getActiveNetworkInfo();
if (ni == null) {
return false;
} else{
return true;
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case android.R.id.home:
if(my_image.getDrawable() != null){
File file = new File("/sdcard/LocationSystem/pendingtask_temp.jpg");
if (file.exists()) {
file.delete();
}
}
Intent loadIntent = new Intent();
loadIntent.putExtra("startUpdate_PList", "start");
setResult(Activity.RESULT_OK, loadIntent);
finish();
break;
default:
return super.onOptionsItemSelected(item);
}
return false;
}
@Override
public void onUserInteraction() {
userInteractionTime = System.currentTimeMillis();
super.onUserInteraction();
Log.i("appname","Interaction");
}
@Override
public void onUserLeaveHint() {
long uiDelta = (System.currentTimeMillis() - userInteractionTime);
super.onUserLeaveHint();
if (uiDelta < 100){
Logout();
}
}
@Override
public void onResume() {
super.onResume();
if(isNetworkConnected()){
try{
SharedPreferences checkLogin1 = getApplicationContext().getSharedPreferences("checklogin", 0);
String staffID = checkLogin1.getString("staffID", "");
String staffPassword = checkLogin1.getString("password", "");
DefaultHttpClient httpClient = new DefaultHttpClient();
//get the unique id
SharedPreferences pref = getApplicationContext().getSharedPreferences("checklogin", 0);
String checkID = pref.getString("loginRID", "");
HttpGet request = new HttpGet(url);
request.setHeader("Accept", "application/json");
request.setHeader("Content-type", "application/json");
HttpResponse response = httpClient.execute(request);
HttpEntity responseEntity = response.getEntity();
// Read response data into buffer
char[] buffer = new char[(int) responseEntity
.getContentLength()];
InputStream stream = responseEntity.getContent();
InputStreamReader reader = new InputStreamReader(stream);
reader.read(buffer);
stream.close();
JSONObject svr = new JSONObject(new String(buffer));
JSONObject obj = svr.getJSONObject("loginTestResult");
String validation = obj.getString("valid");
String position = obj.getString("position");
String companyID = obj.getString("companyID");
String messageStatus = obj.getString("message");
if(validation.equals("1")){
checkNotNull(SERVER_URL, "SERVER_URL");
checkNotNull(SENDER_ID, "SENDER_ID");
// Make sure the device has the proper dependencies.
GCMRegistrar.checkDevice(this);
// Make sure the manifest was properly set - comment out this line
// while developing the app, then uncomment it when it's ready.
GCMRegistrar.checkManifest(this);
//mDisplay = (TextView) findViewById(R.id.display);
//gcmIDtxt =(TextView) findViewById(R.id.gcmID);
registerReceiver(mHandleMessageReceiver, new IntentFilter(DISPLAY_MESSAGE_ACTION));
final String regId = GCMRegistrar.getRegistrationId(this);
System.out.print(regId);
if (regId.equals("")) {
// Automatically registers application on startup.
GCMRegistrar.register(this, SENDER_ID);
} else {
// Device is already registered on GCM, check server.
// if (GCMRegistrar.isRegisteredOnServer(this)) {
// // Skips registration.
// //mDisplay.append(getString(R.string.already_registered) + "\n");
// //gcmIDtxt.setText(regId);
//
// } else {
// Try to register again, but not in the UI thread.
// It's also necessary to cancel the thread onDestroy(),
// hence the use of AsyncTask instead of a raw thread.
final Context context = this;
mRegisterTask = new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
boolean registered =
ServerUtilities.register(context, regId);
// At this point all attempts to register with the app
// server failed, so we need to unregister the device
// from GCM - the app will try to register again when
// it is restarted. Note that GCM will send an
// unregistered callback upon completion, but
// GCMIntentService.onUnregistered() will ignore it.
if (!registered) {
GCMRegistrar.unregister(context);
}
return null;
}
@Override
protected void onPostExecute(Void result) {
mRegisterTask = null;
}
};
mRegisterTask.execute(null, null, null);
// }
}
}else{
AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(this, R.style.AlertDialogTheme));
builder.setCancelable(false);
builder.setTitle("Error");
builder.setMessage(messageStatus + " Please sign in again.");
// Setting Icon to Dialog
builder.setIcon(android.R.drawable.ic_dialog_alert);
builder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
SharedPreferences pref2 = getApplicationContext().getSharedPreferences("checklogin", 0);
final SharedPreferences.Editor editor1 = pref2.edit();
editor1.putInt("login", 0);
editor1.commit();
Intent intent = new Intent(AcceptTask.this, LoginPage.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
}
});
builder.show();
}
} catch(Exception e) {
if(e != null) {
showServerErrorDialog();
}
}
}else{
showNetworkErrorDialog();
}
//runAcceptedTask();
}
private final BroadcastReceiver mHandleMessageReceiver =
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String newMessage = intent.getExtras().getString(EXTRA_MESSAGE);
//mDisplay.append(newMessage + "\n");
}
};
private void checkNotNull(Object reference, String name) {
if (reference == null) {
throw new NullPointerException(
getString(R.string.error_config, name));
}
}
private void Logout(){
if(isNetworkConnected()){
try{
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
DefaultHttpClient httpClient = new DefaultHttpClient();
//get the unique id
SharedPreferences pref = getApplicationContext().getSharedPreferences("checklogin", 0);
String checkID = pref.getString("loginRID", "");
String staffID = pref.getString("staffID", "");
HttpGet request = new HttpGet(url);
request.setHeader("Accept", "application/json");
request.setHeader("Content-type", "application/json");
HttpResponse response = httpClient.execute(request);
HttpEntity responseEntity = response.getEntity();
// Read response data into buffer
char[] buffer = new char[(int) responseEntity
.getContentLength()];
InputStream stream = responseEntity.getContent();
InputStreamReader reader = new InputStreamReader(stream);
reader.read(buffer);
stream.close();
JSONObject svr = new JSONObject(new String(buffer));
JSONObject obj = svr.getJSONObject("logoutResult");
String messageStatus = obj.getString("userMessage");
if(messageStatus.equals("Updated Successfully!!")){
}else{
AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(this, R.style.AlertDialogTheme));
builder.setCancelable(false);
builder.setTitle("Error");
builder.setMessage(messageStatus);
// Setting Icon to Dialog
builder.setIcon(R.drawable.ic_action_error);
builder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
builder.show();
}
} catch (Exception e) {
if(e != null) {
showServerErrorDialog();
}
}
}
else{
showNetworkErrorDialog();
}
}
//accept task button
public void acceptTask(View v) {
File file = new File("/sdcard/LocationSystem/pendingtask_temp.jpg");
if (file.exists()) {
file.delete();
}
AlertDialog.Builder builder = new AlertDialog.Builder(AcceptTask.this);
builder.setTitle("Confirm Accept");
builder.setMessage("Are you sure to accept this job?");
builder.setPositiveButton("YES", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
if(isNetworkConnected()){
try{
// Do do my action here
SharedPreferences pref = getApplicationContext().getSharedPreferences(
"checklogin", 0);
String staffID = pref.getString("staffID", "");
//sendingURL = ""+staffID;
sendingURL = "url";
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(sendingURL);
try {
api = json.getJSONObject(TAG_GETA);
check = api.getString(TAG_STATUS);
} catch (JSONException e) {
if(e != null) {
showServerErrorDialog();}
}
if(check.equals("Job available")){
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(sendingURL);
try {
HttpResponse response = httpclient.execute(httpget);
Toast.makeText(getApplicationContext(), "You accepted the job.", Toast.LENGTH_SHORT).show();
Intent loadIntent = new Intent();
loadIntent.putExtra("startUpdate_PList", "start");
setResult(Activity.RESULT_OK, loadIntent);
finish();
}
catch (IOException e) {
if(e != null) {
showServerErrorDialog();}
}
}else{
AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(AcceptTask.this, R.style.AlertDialogTheme));
builder.setCancelable(false);
builder.setTitle("Job Unavailable");
builder.setMessage(check);
// Setting Icon to Dialog
builder.setIcon(R.drawable.ic_action_error);
builder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent loadIntent = new Intent();
loadIntent.putExtra("startUpdate_PList", "start");
setResult(Activity.RESULT_OK, loadIntent);
finish();
}
});
builder.show();
}
} catch(Exception e) {
if(e != null) {
showServerErrorDialog();
}
}
}else{
showNetworkErrorDialog();
}
}
});
builder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
private class DownloadImageTask extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(progress_bar_type);
}
protected String doInBackground(String... urls) {
int count;
try {
URL url = new URL(urls[0]);
URLConnection connection = url.openConnection();
connection.connect();
int lenghtOfFile = connection.getContentLength();
InputStream in = new BufferedInputStream(url.openStream(), 8192);
byte data[] = new byte[1024];
// Output stream to write file
OutputStream output = new FileOutputStream("/sdcard/LocationSystem/pendingtask_temp.jpg");
long total = 0;
while((count = in.read(data)) != -1){
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
File file = new File(getExternalCacheDir(), "pendingtask_temp.jpg");
if (file.exists()) {
file.delete();
}else{
output.write(data, 0, count);
}
}
output.flush();
output.close();
in.close();
} catch (Exception e) {
Log.e("Error", e.getMessage());
if(e != null) {
showServerErrorDialog();
}
}
return null;
}
/**
* Updating progress bar
* */
protected void onProgressUpdate(String... progress) {
// setting progress percentage
pDialog.setProgress(Integer.parseInt(progress[0]));
}
protected void onPostExecute(String file_url) {
// dismiss the dialog after the file was downloaded
dismissDialog(progress_bar_type);
String imagePath = Environment.getExternalStorageDirectory().toString() + "/LocationSystem/pendingtask_temp.jpg";
// setting downloaded into image view
my_image.setImageDrawable(Drawable.createFromPath(imagePath));
File file = new File("/sdcard/LocationSystem/pendingtask_temp.jpg");
if (file.exists()) {
file.delete();
}
if (my_image.getDrawable() == null){
Toast.makeText(AcceptTask.this, "Please select again!",Toast.LENGTH_LONG).show();
finish();
}
}
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case progress_bar_type: // we set this to 0
pDialog = new ProgressDialog(this);
pDialog.setMessage("Downloading file. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setMax(100);
pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
//pDialog.setButton("Cancel", (DialogInterface.OnClickListener) null);
pDialog.setButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
AcceptTask.this.finish();
}
});
pDialog.setCancelable(false);
pDialog.show();
return pDialog;
default:
return null;
}
}
@Override
public void onBackPressed() {
if(my_image.getDrawable() != null){
File file = new File("/sdcard/LocationSystem/pendingtask_temp.jpg");
if (file.exists()) {
file.delete();
}
}
Intent loadIntent = new Intent();
loadIntent.putExtra("startUpdate_PList", "start");
setResult(Activity.RESULT_OK, loadIntent);
finish();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
MenuInflater inflater = getSupportMenuInflater();
inflater.inflate(R.menu.accept_task, menu);
return true;
}
}
您的代碼看起來沒問題。你有什麼問題？你有一些錯誤？ –
是的我的代碼是完美的工作。現在我只想使用數據庫中的long/lat值在谷歌地圖上顯示任務標記，我在這樣做時遇到了一些問題。 – user3777508
問題是什麼？ –