I'm very new on Android world. After developing a beautiful Rest API I thought Android development will be easy, but I'm stuck on basics.
On my Android app, I created Login, that makes an API call, that return a token when valid credentials are provided; this token is stored on shared preferences, and user is redirected to the principal activity: HomeActivity.
This Activity has a lot of work to do:
It has a BottomNavigationBar, so when the user clicks on a button of it, a new Fragment will be loaded.
Call to the API endpoint to get resources and show it depending on the fragment.
Store API response on Database to avoid overload server.
Surely, for Android developer this will be quite easy, but for my is like this:
import android.arch.persistence.room.Room;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.ibosca.thub.database.AppDatabase;
import com.ibosca.thub.helpers.BottomNavigationViewHelper;
import com.ibosca.thub.models.Channel;
import com.ibosca.thub.models.Content;
import com.ibosca.thub.models.ContentList;
import com.ibosca.thub.models.Town;
import com.ibosca.thub.models.User;
import com.ibosca.thub.parser.ContentParser;
import com.ibosca.thub.volley.MySingleton;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class HomeActivity extends AppCompatActivity {
private String userToken;
public TextView contentList;
private ContentParser contentParser = new ContentParser();
public static AppDatabase db;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, "townhub").build();
contentList = (TextView) findViewById(R.id.contentList);
loadContents();
SharedPreferences sharedPref = getSharedPreferences(MainActivity.PACKAGE_NAME, Context.MODE_PRIVATE);
userToken = sharedPref.getString("token", null);
BottomNavigationView bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottom_navigation);
BottomNavigationViewHelper.disableShiftMode(bottomNavigationView);
View contentsButton = bottomNavigationView.findViewById(R.id.action_contents);
contentsButton.performClick();
bottomNavigationView.setOnNavigationItemSelectedListener(
new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Toast toast = Toast.makeText(getApplicationContext(), "UNDF", Toast.LENGTH_LONG);
switch (item.getItemId()) {
case R.id.action_towns:
toast = Toast.makeText(getApplicationContext(), "Towns", Toast.LENGTH_LONG);
break;
case R.id.action_channels:
toast = Toast.makeText(getApplicationContext(), "Channels", Toast.LENGTH_LONG);
break;
case R.id.action_contents:
loadContents();
break;
case R.id.action_question:
toast = Toast.makeText(getApplicationContext(), "Questions", Toast.LENGTH_LONG);
break;
case R.id.action_user:
toast = Toast.makeText(getApplicationContext(), "Settings", Toast.LENGTH_LONG);
break;
}
toast.show();
return true;
}
});
}
public void ExecuteInsert(ContentList...lists){
new InsertContents().execute(lists);
}
protected void loadContents() {
String url = MySingleton.BASE_URL + "/contents";
JsonObjectRequest jsObjRequest = new JsonObjectRequest
(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
ContentList list = contentParser.fromContents(response);
ContentList[] lists = new ContentList[1];
lists[0] = list;
ExecuteInsert(lists);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), "Failed to connect", Toast.LENGTH_LONG).show();
}
}) {
#Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<>();
headers.put("Authorization", "Bearer " + userToken);
return headers;
}
};
MySingleton.getInstance(this).addToRequestQueue(jsObjRequest);
}
public static class InsertContents extends AsyncTask<ContentList, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
//Perform pre-adding operation here.
}
#Override
protected Void doInBackground(ContentList...lists) {
ContentList list = lists[0];
//Insert towns, channels
db.townDao().insertArrayList(list.getTowns());
db.channelDao().insertArrayList(list.getChannels());
db.userDao().insertArrayList(list.getUsers());
db.contentDao().insertArrayList(list.getContents());
//Select data from DB
List<Town> towns = db.townDao().getAll();
List<Channel> channels = db.channelDao().getAll();
List<User> users = db.userDao().getAll();
List<Content> contents = db.contentDao().getAll();
for (int i = 0; i < contents.size(); i++) {
Content content = contents.get(i);
Town contentTown = db.townDao().findById(content.getTownId());
Log.i("Poble: ", contentTown.getName());
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
//To after addition operation here.
}
}
}
For a quick summary, on method loadContents() I'm making the API call; and the class InsertContents it's where I play with local database.
Finally, the questions:
1) As you can see, I'm using Volley to make API calls. Are there any best practice to put any "api endpoint" on a separated class, and use this class from the Activity? How to separate this code on Android development?
2) Same for Database management. How can I put the code on a separated class and call it from the Activity? This is currently accomplished, but... I'm unable to update my TextView from the AsyncTask (Update the TextView it's only a easy try, my final goal it's to use a ListView or ReciclerView.
Any suggestions for improvement are welcome.
You might try the Repository pattern.
The idea is more or less as follows, lets say you have a Car domain class and you database or api interactions perform tipical CRUD operation like, insert a car, retrieve a list of al card or one by its plate number.
You could create an interface like
public interface CarRepository {
void insertCar(#NonNull Car car);
List<Car> getAllCars();
Car getCarByPlate(#NonNull String plateNumber);
}
Then you can create concrete implementations of said interface depending of which source are you using for storing your data.
For example if using volley you could create a RestCarRepository that extends CarRepository and fetch/ store data from a rest api using Volley. Or a DBCarRepository that uses SQLite (or any other database engine).
Finally you can declare your repository in you activity so you abstract the logic of fetching data.
Disclaimer: There are lots of articles regarding repository pattern (as the posted at the beggining of the answer) and this answer could become more complex when adding more patterns as DI or MVP, this is so you have a grasp of the idea.
Short answer for both cases: It would be better separate the view (activity/fragment) from the model or data. You are mixing everything in the activity and in this small case could be ok but if your app grows will be dificult to read and understand and cause problems with the activity/fragment lifecycle.
There are a lot of different aproaches to separate concerns in android in order to do a cleaner code.
I recommend you this repo talking about clean architecture in android apps https://github.com/android10/Android-CleanArchitecture
Also Google has a relatively new library to implements several patterns
https://developer.android.com/topic/libraries/architecture/adding-components.html
Here you have some help about databases, paging, viewmodel, etc.
EDIT:
Answering more in detail:
1) You can follow the Model View Presenter (MVP) pattern considering the activity/fragment like only a View (a component with an only one responsibility, render components) and creating a class (the Presenter) who has the knowledge of the model/data (your api calls) and act like a bridge between View and Model.
The view will delegate in Presenter the calls to the model (for example if some button is pressed) and the Presenter will return the data to the View and the View will have only the way of paint the screen.
2) You can follow the same approach calling the Presenter in order to retrieve the information and painting the data in a RecyclerView.
You can use a ThreadPoolExecutor in order to decouple the data from the activity.
Related
Right now, I'm on an activity where a user has to input their first name, last name, and id into an EditText. The value they put in there is saved onto the Firestore Console. Here is my problem:
I open my app and sign in with google with my google account, let's call this account my primary account. I fill in the 3 EditTexts, and press on the save button that I named as "btnNextStep" (because it's meant to bring you to the next part of the form, but for now it is the "save" button). Once I press save, I can see the data I filled in, on Google Firestore. Now if I were to sign in to another Google account on the same device, call it my secondary account, and I fill in the EditTexts. Once I press save, instead of creating a new document in Firestore, it overwrites the primary account's data. The final product on Firestore is that it has the data from the secondary account saved, but the data from the primary account is now gone.
Here is the code to my .java file for this activity:
package com.example.attenda_attempt3;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.FirebaseFirestore;
import org.jetbrains.annotations.NotNull;
import java.util.HashMap;
import java.util.Map;
public class StudentInformationFormActivity extends AppCompatActivity {
Button btnNextStep;
EditText etFirstName;
EditText etLastName;
EditText etSchoolID;
FirebaseFirestore db = FirebaseFirestore.getInstance();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_student_information_form);
btnNextStep = findViewById(R.id.btnNextStep);
etFirstName = findViewById(R.id.etFirstName);
etLastName = findViewById(R.id.etLastName);
etSchoolID = findViewById(R.id.etSchoolID);
btnNextStep.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String firstName = etFirstName.getText().toString();
String lastName = etLastName.getText().toString();
String schoolID = etSchoolID.getText().toString();
Map<String, Object> data = new HashMap<>();
data.put("First Name", firstName);
data.put("Last Name", lastName);
data.put("School ID", schoolID);
db.collection("Users").document("User Information").set(data)
.addOnSuccessListener(new OnSuccessListener<Void>() {
#Override
public void onSuccess(Void unused) {
Toast.makeText(getApplicationContext(), "Saved", Toast.LENGTH_SHORT).show();
}
})
.addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull #NotNull Exception e) {
Toast.makeText(getApplicationContext(), "Error Occurred, Data Not Saved", Toast.LENGTH_SHORT).show();
}
});
}
});
}
}
Can someone help me make it so everytime a user presses the "btnNextStep", it creates a new document and saves the data.
You'll need to generate a unique ID for each user and enter that into this line:
db.collection("Users").document("uniqueUserId").set(data)
If you'd be using Firebase Authentication, it'd automatically generate such a unique user ID for each user. But since you're not using any existing user management API (which is fine), you'll need to generate the ID yourself, associate it with the user in the database as shown above, and possibly also store it in local storage (like SharedPreferences) to be able to restore it when the app restarts.
One of the functions in my app is sending email. The email list is generated by querying from SQLite database table. So sending email and query data from SQLite database at the same activity. It is not working. Sending email code works if I apply the code in a simple app. Query works. It is not working when I put them all together. After reading online, my feeling is that I need to create a new thread that handle the SQLite database query. I am very new for android and java and don't know how to create a new thread (background).
Could somebody help me? Many many thanks!!!!!
my activity code as following:
package jhapps.com.demographics;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class PromotionEmailMonthTop10 extends Activity {
private EditText subjectGroupTop10,bodyGroupTop10;
private Button btnMonthTop10;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_promotion_email_month_top10);
subjectGroupTop10=(EditText)findViewById(R.id.subjectMonthTop10);
bodyGroupTop10=(EditText)findViewById(R.id.bodyMonthTop10);
btnMonthTop10=(Button)findViewById(R.id.btnMonthTop10);
btnMonthTop10.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
EmailMonthTop10();
// after sending the email, clear the fields
subjectGroupTop10.setText("");
bodyGroupTop10.setText("");
}
});
}
//get month top 10 email list
protected void EmailMonthTop10() {
DataBaseHelper dataBaseHelper=new DataBaseHelper(PromotionEmailMonthTop10.this);
String[] emailGroupTop10=new String[dataBaseHelper.eMailListMonthTop10().size()];
for(int i=0;i<dataBaseHelper.eMailListMonthTop10().size();i++){
emailGroupTop10[i]=dataBaseHelper.eMailListMonthTop10().get(i);
}
String subjects=subjectGroupTop10.getText().toString();
String bodytext=bodyGroupTop10.getText().toString();
//start email intent
Intent email = new Intent(Intent.ACTION_SENDTO);
// prompts email clients only
email.setType("message/rfc822");
email.setData(Uri.parse("mailto:"));
email.putExtra(Intent.EXTRA_EMAIL,emailGroupTop10 );
// email.putExtra(Intent.EXTRA_EMAIL,new String []{"junrudeng#gmail.com","huangji8#gmail.com"});
email.putExtra(Intent.EXTRA_SUBJECT, subjects);
email.putExtra(Intent.EXTRA_TEXT, bodytext);
try {
// the user can choose the email client
startActivity(Intent.createChooser(email, "Choose an email client from..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(PromotionEmailMonthTop10.this, "No email client installed.",
Toast.LENGTH_LONG).show();
}
}
}
You should never execute database queries or network calls on the main thread. If you want to query a database to display data you probably want to you a AsyncTask for that.
Something like the following should work:
public class PromotionEmailMonthTop10 extends Activity {
...
#Override
protected void onCreate(Bundle savedInstanceState) {
...
btnMonthTop10.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new SendEmailTop10Task().execute();
}
});
}
class SendEmailTop10Task extends AsyncTask<Void, Void, Void> {
// This is called on a seperate thread
#Override
protected Void doInBackground(Void... voids) {
EmailMonthTop10();
}
// This is called on the main thread
#Override
protected void onPostExecute(Integer status) {
subjectGroupTop10.setText("");
bodyGroupTop10.setText("");
}
}
}
Please consider renaming your method taking the java naming conventions under consideration
I have been using this Android Guide
While it has been a pleasant experience so far, I am experiencing my first problem. I copied all the code from the source that is in the link, and pasted it to the project folder, replacing all old files. Before starting to understand what I had pasted, I thought it would be logical to run the code first to check for problems. The project wouldn't run because of an R object missing. After importing it (Eclipse's solution to the problem), more errors popped up. I tried searching for an answer, both on the Internet and in the book, but to no avail. Since my software is up to date, I doubt this is a problem on the software's side. And since the code is available online, I think the problem would have popped up and been fixed.
Thank you in advance for the help. For extra details please ask in the comments.
The code:
MainActivity.java
package com.dummies.android.silentmodetoggle;
import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.media.AudioManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity {
private AudioManager mAudioManager;
private boolean mPhoneIsSilent;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mAudioManager = (AudioManager)getSystemService(AUDIO_SERVICE);
checkIfPhoneIsSilent();
setButtonClickListener();
Log.d("SilentModeApp", "This is a test");
}
private void setButtonClickListener() {
Button toggleButton = (Button)findViewById(R.id.toggleButton);
toggleButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (mPhoneIsSilent) {
// Change back to normal mode
mAudioManager
.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
mPhoneIsSilent = false;
} else {
// Change to silent mode
mAudioManager.setRingerMode(AudioManager.RINGER_MODE_SILENT);
mPhoneIsSilent = true;
}
// Now toggle the UI again
toggleUi();
}
});
}
/**
* Checks to see if the phone is currently in silent mode.
*/
private void checkIfPhoneIsSilent() {
int ringerMode = mAudioManager.getRingerMode();
if (ringerMode == AudioManager.RINGER_MODE_SILENT) {
mPhoneIsSilent = true;
} else {
mPhoneIsSilent = false;
}
}
/**
* Toggles the UI images from silent
* to normal and vice versa.
*/
private void toggleUi() {
ImageView imageView =
(ImageView) findViewById(R.id.phone_icon);
Drawable newPhoneImage;
if (mPhoneIsSilent) {
newPhoneImage =
getResources().getDrawable(R.drawable.phone_silent);
} else {
newPhoneImage =
getResources().getDrawable(R.drawable.phone_on);
}
imageView.setImageDrawable(newPhoneImage);
}
#Override
protected void onResume() {
super.onResume();
checkIfPhoneIsSilent();
toggleUi();
};
}
Try cleaning your project, this will rebuild your R file. If there is still no R file in your file-tree then you may have an error in one your xml layout files. Eclipse may not tell you this so be vigilant and check through all the files in the /res folder. Also, never import R when this happens.
Did you check if there is a variable named action_settings in /res/values/string.xml if it does not exist please create one and then clean using projects -> clean makesure that build Automatically is checked
So, I have a login screen. Upon pressing the 'Login' Button a JDBC Connection is made to check the username and password and then move onto the next Activity if the details are correct. As a result of this, the UI hangs for approximately 5 second. I assumed that this was because the connection was created in the same Thread, so I created a new one. I then created a Handler to interact with the UI depending on what happened with this connection.
The trouble is, the UI still hangs. Below is where the new Runnable is declared in the Activity (h is the custom Handler reference belonging to this Activity);
logInButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
progress.setVisibility(ProgressBar.VISIBLE);
new LoginProcessor(h).run(); // HERE!
}});
Below is the run() method from the LoginProcessor Runnable which includes the code that is causing the hang. The MicroManager class contains simple JDBC database interactions and makes the connection (nothing exciting in there really and I am trying to keep this as short as possible);
public void run() {
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_BACKGROUND);
try{
MicroManager manager = new MicroManager(); // THIS LINE, AND THE LINE BELOW, ARE CAUSING THE HANG!!!!
if(manager.getEmployeeId(h.getLoginName(), h.getPassword())!= 0){
h.sendEmptyMessage(0);
}
}catch(Exception ex){
ex.printStackTrace();
h.sendEmptyMessage(1);
}
}
In the above, there is no direct interaction with the UI. Information is simply sent to the Handler so that it can do it on the UI thread. Lastly, here are the methods of my custom Handler called LogInHandler;
#Override
public void handleMessage(Message msg){
if(msg.what == 0){
activity.startActivity(new Intent(activity, AdvisorsPanelActivity.class));
activity.finish();
}else{
AlertDialog alertDialog = new AlertDialog.Builder(activity).create();
alertDialog.setTitle("Not Working");
alertDialog.show();
activity.setProgressVisible(ProgressBar.GONE);
}
}
public String getLoginName(){
return activity.getLoginName();
}
public String getPassword(){
return activity.getPassword();
}
Sorry to dump so much code on your guys, but I didn't think a complete picture was possible without all the above. I've trimmed it down as much as I can. I've only recently started working with Threading AND Android, so please be gentle with me.
Based on my experience: Use AsyncTask for JDBC and you shall torture no more.
EDIT :
This is a neat example of implementing AsyncTask:
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.Settings.System;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.view.View.OnClickListener;
public class AsyncTaskActivity extends Activity implements OnClickListener {
Button btn;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button) findViewById(R.id.button1);
// because we implement OnClickListener we only have to pass "this"
// (much easier)
btn.setOnClickListener(this);
}
public void onClick(View view) {
// detect the view that was "clicked"
switch (view.getId()) {
case R.id.button1:
new LongOperation().execute("");
break;
}
}
private class LongOperation extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
for (int i = 0; i < 5; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
return "Executed";
}
#Override
protected void onPostExecute(String result) {
TextView txt = (TextView) findViewById(R.id.output);
txt.setText("Executed"); // txt.setText(result);
// might want to change "executed" for the returned string passed
// into onPostExecute() but that is upto you
}
#Override
protected void onPreExecute() {}
#Override
protected void onProgressUpdate(Void... values) {}
}
}
You may want to create and handle your JDBC connection in
doInBackground(String... params) part of your code.
Good Luck.
I’m an experienced AS3 developer and I’ve done quite some stuff with Java for my backends but I’m new to Native Android development so I’m having troubles with some basic Tasks for my first Project.
So hope one of you cracks can help me out here or point me in the right directions, it would be much appreciated and I’ll repay be helping out in the AS3 section. That briefly about me, since it’s my first post. ;)
The task at hand is to get the users postcode on application launch. I’ve been using an AsyncTask for the reverse geocoding and It generally seems to work. But only when I call the ReverseGeocodingTask on a button click, and give it a few seconds before I do so. If I press it immediately it sometimes works and sometimes doesn’t, so obviously when I call it in the onCreate method the app crashes aswell. It also crashes when I turn the internet off on the phone. I reckoned the network provider location should be sufficient and there is no need for the GPS accuracy and the additional permissions.
If the INet is turned off by the user, it should just show a message that the postcode can’t be found and give the user the option to input it manually.
I figured that the currentLocation to pass to the geocoding has not been found yet and is throwing a NullPointerException, so I tried to prevent that by checking it before the call. But that didn’t really help and is no solution for the final version anyways.
Since its always best to show the code so u guys know what’s going on, here goes:
package com.adix.DroidTest;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.location.*;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.atomic.AtomicReference;
import static java.util.Locale.getDefault;
public class MyActivity extends Activity implements View.OnClickListener {
Button getPostCode, confirm;
TextView tvPostcode;
LocationManager locationManager;
Location currentLocation;
double currentLatitude;
double currentLongitude;
private Handler mHandler;
private static final int UPDATE_ADDRESS = 1;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
AtomicReference<LocationListener> locationListener = new AtomicReference<LocationListener>(new LocationListener() {
public void onLocationChanged(Location location) {
updateLocation(location);
}
private void updateLocation(Location location) {
currentLocation = location;
currentLatitude = currentLocation.getLatitude();
currentLongitude = currentLocation.getLongitude();
}
public void onStatusChanged(
String provider, int status, Bundle extras) {
}
public void onProviderEnabled(String provider) {
}
public void onProviderDisabled(String provider) {
}
});
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener.get());
//getAddress();
mHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case UPDATE_ADDRESS:
tvPostcode.setText((String) msg.obj);
break;
}
}
};
}
private void init() {
getPostCode = (Button)findViewById(R.id.bGetPostCode);
confirm = (Button)findViewById(R.id.bConfirm);
tvPostcode = (TextView)findViewById(R.id.tvPostcode);
getPostCode.setOnClickListener(this);
confirm.setOnClickListener(this);
}
#Override
public void onClick(View view) {
switch (view.getId()){
case R.id.bGetPostCode:
currentLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if(currentLocation != null) {
Log.d("TRACE",currentLocation.toString());
Toast.makeText(this, "Suche Postleitzahl", Toast.LENGTH_LONG).show();
(new ReverseGeocodingTask(this)).execute(new Location[]{currentLocation});
}
break;
case R.id.bConfirm:
Intent i = new Intent(MyActivity.this, MainMenu.class);
startActivity(i);
finish();
}
}
private class ReverseGeocodingTask extends AsyncTask<Location, Void, Void> {
Context mContext;
public ReverseGeocodingTask(Context context) {
super();
mContext = context;
}
#Override
protected Void doInBackground(Location... locations) {
try{
Geocoder gcd = new Geocoder(mContext, Locale.getDefault());
List<Address> addresses = gcd.getFromLocation(currentLatitude, currentLongitude,100);
Address address = addresses.get(0);
StringBuilder result = new StringBuilder();
result.append(address.getPostalCode());
// tvPostcode.setText(result.toString());
Message.obtain(mHandler, UPDATE_ADDRESS, result.toString()).sendToTarget();
}
catch(IOException ex){
tvPostcode.setText(ex.getMessage().toString());
Message.obtain(mHandler, UPDATE_ADDRESS, ex.getMessage().toString()).sendToTarget();
}
return null;
}
}
}
I gave this a rest since this post to see if someone sees my mistake. Since I hadn't got an answer, I gave it another shot today. And fortunately found the answer quite quick in the end. Obviously I needed to execute the ReverseGeocodingTask in the onLocationChanged method after updateLocation.