Hello everyone,
I have a quick question.
Can someone help me with an algorithm that will:
1. Sort incoming data from Arduino transfered via Bluetooth to the Android App.
2. Sort for example, if i have 1000 data but i only want the important ones that I use to compare with my file.
Thank you guys in advance,
Cookie
cookiey89 said:
Hello everyone,
I have a quick question.
Can someone help me with an algorithm that will:
1. Sort incoming data from Arduino transfered via Bluetooth to the Android App.
2. Sort for example, if i have 1000 data but i only want the important ones that I use to compare with my file.
Thank you guys in advance,
Cookie
Click to expand...
Click to collapse
You'll need a script for that, so keep asking for help because I am unable to
Envoyé de mon SM-G928F en utilisant Tapatalk
You're probably not looking for a specific algorithm, but rather for some technical guidance? How far along are you? Did you get the Bluetooth connection between the two to work? Are you building your own app?
cookiey89 said:
Hello everyone,
I have a quick question.
Can someone help me with an algorithm that will:
1. Sort incoming data from Arduino transfered via Bluetooth to the Android App.
2. Sort for example, if i have 1000 data but i only want the important ones that I use to compare with my file.
Thank you guys in advance,
Cookie
Click to expand...
Click to collapse
Assuming your data is simply some numbers, you can put them in ArrayList and then sort them using Collections.sort() function. For example if you want to get 3 greatest numbers , you can do something like that:
Code:
List<Integer> data = new ArrayList<>();
data.add(5);
data.add(10);
data.add(3);
data.add(20);
data.add(1);
data.add(6);
Collections.sort(data, Comparator.reverseOrder());
List<Integer> topNumbers = data.subList(0, 3);
System.out.println("Top 3 numbers: " + topNumbers);
If you need something more complex, please provide some more information about your data and what you mean by "important"
Hi Everyone,
thank you for the fast responses.
This is my initial plan:
I want to gather data from Arduino via bluetooth to the android app.
From there, I want to "sort" the data in such a way to minimize and specify the data I want to compare to a library.
The data will be analog values from various sensors on the Arduino.
Thanks
Cookie
cookiey89 said:
Hello everyone,
I have a quick question.
Can someone help me with an algorithm that will:
1. Sort incoming data from Arduino transfered via Bluetooth to the Android App.
2. Sort for example, if i have 1000 data but i only want the important ones that I use to compare with my file.
Thank you guys in advance,
Cookie
Click to expand...
Click to collapse
i think , to make that solutions works, you need to insert the datas to database first..
cmiiw
It's Java code of main activity:
package com.example.bluetooth1;
import java.io.IOException;
import java.iutputStream;
import java.lang.reflect.Method;
import java.util.UUID;
import com.example.bluetooth1.R;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final String TAG = "bluetooth1";
Button btnOn, btnOff;
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
// SPP UUID service
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// MAC-address of Bluetooth module (you must edit this line)
private static String address = "00:15:FF:F2:19:5F";
/** Called when the activity is first created. */
@override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnOn = (Button) findViewById(R.id.btnOn);
btnOff = (Button) findViewById(R.id.btnOff);
btAdapter = BluetoothAdapter.getDefaultAdapter();
checkBTState();
btnOn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("1");
Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
}
});
btnOff.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("0");
Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
}
});
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
if(Build.VERSION.SDK_INT >= 10){
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
return (BluetoothSocket) m.invoke(device, MY_UUID);
} catch (Exception e) {
Log.e(TAG, "Could not create Insecure RFComm Connection",e);
}
}
return device.createRfcommSocketToServiceRecord(MY_UUID);
}
@override
public void onResume() {
super.onResume();
Log.d(TAG, "...onResume - try connect...");
// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);
// Two things are needed to make a connection:
// A MAC address, which we got above.
// A Service ID or UUID. In this case we are using the
// UUID for SPP.
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e1) {
errorExit("Fatal Error", "In onResume() and socket create failed: " + e1.getMessage() + ".");
}
// Discovery is resource intensive. Make sure it isn't going on
// when you attempt to connect and pass your message.
btAdapter.cancelDiscovery();
// Establish the connection. This will block until it connects.
Log.d(TAG, "...Connecting...");
try {
btSocket.connect();
Log.d(TAG, "...Connection ok...");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
}
}
// Create a data stream so we can talk to server.
Log.d(TAG, "...Create Socket...");
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and output stream creation failed:" + e.getMessage() + ".");
}
}
@override
public void onPause() {
super.onPause();
Log.d(TAG, "...In onPause()...");
if (outStream != null) {
try {
outStream.flush();
} catch (IOException e) {
errorExit("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
}
}
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
}
}
private void checkBTState() {
// Check for Bluetooth support and then check to make sure it is turned on
// Emulator doesn't support Bluetooth and will return null
if(btAdapter==null) {
errorExit("Fatal Error", "Bluetooth not support");
} else {
if (btAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth ON...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
private void errorExit(String title, String message){
Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
finish();
}
private void sendData(String message) {
byte[] msgBuffer = message.getBytes();
Log.d(TAG, "...Send data: " + message + "...");
try {
outStream.write(msgBuffer);
} catch (IOException e) {
String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
if (address.equals("00:00:00:00:00:00"))
msg = msg + ".\n\nUpdate your server address from 00:00:00:00:00:00 to the correct address on line 35 in the java code";
msg = msg + ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";
errorExit("Fatal Error", msg);
}
}
}
MihaelYank said:
It's Java code of main activity:
package com.example.bluetooth1;
import java.io.IOException;
import java.iutputStream;
import java.lang.reflect.Method;
import java.util.UUID;
import com.example.bluetooth1.R;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final String TAG = "bluetooth1";
Button btnOn, btnOff;
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
// SPP UUID service
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// MAC-address of Bluetooth module (you must edit this line)
private static String address = "00:15:FF:F2:19:5F";
/** Called when the activity is first created. */
@override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnOn = (Button) findViewById(R.id.btnOn);
btnOff = (Button) findViewById(R.id.btnOff);
btAdapter = BluetoothAdapter.getDefaultAdapter();
checkBTState();
btnOn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("1");
Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
}
});
btnOff.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("0");
Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
}
});
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
if(Build.VERSION.SDK_INT >= 10){
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
return (BluetoothSocket) m.invoke(device, MY_UUID);
} catch (Exception e) {
Log.e(TAG, "Could not create Insecure RFComm Connection",e);
}
}
return device.createRfcommSocketToServiceRecord(MY_UUID);
}
@override
public void onResume() {
super.onResume();
Log.d(TAG, "...onResume - try connect...");
// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);
// Two things are needed to make a connection:
// A MAC address, which we got above.
// A Service ID or UUID. In this case we are using the
// UUID for SPP.
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e1) {
errorExit("Fatal Error", "In onResume() and socket create failed: " + e1.getMessage() + ".");
}
// Discovery is resource intensive. Make sure it isn't going on
// when you attempt to connect and pass your message.
btAdapter.cancelDiscovery();
// Establish the connection. This will block until it connects.
Log.d(TAG, "...Connecting...");
try {
btSocket.connect();
Log.d(TAG, "...Connection ok...");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
}
}
// Create a data stream so we can talk to server.
Log.d(TAG, "...Create Socket...");
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and output stream creation failed:" + e.getMessage() + ".");
}
}
@override
public void onPause() {
super.onPause();
Log.d(TAG, "...In onPause()...");
if (outStream != null) {
try {
outStream.flush();
} catch (IOException e) {
errorExit("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
}
}
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
}
}
private void checkBTState() {
// Check for Bluetooth support and then check to make sure it is turned on
// Emulator doesn't support Bluetooth and will return null
if(btAdapter==null) {
errorExit("Fatal Error", "Bluetooth not support");
} else {
if (btAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth ON...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
private void errorExit(String title, String message){
Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
finish();
}
private void sendData(String message) {
byte[] msgBuffer = message.getBytes();
Log.d(TAG, "...Send data: " + message + "...");
try {
outStream.write(msgBuffer);
} catch (IOException e) {
String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
if (address.equals("00:00:00:00:00:00"))
msg = msg + ".\n\nUpdate your server address from 00:00:00:00:00:00 to the correct address on line 35 in the java code";
msg = msg + ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";
errorExit("Fatal Error", msg);
}
}
}
Click to expand...
Click to collapse
Thank you, I will try it out
andihong said:
i think , to make that solutions works, you need to insert the datas to database first..
cmiiw
Click to expand...
Click to collapse
Can I place the incoming data values into an array? I will referesh the array everytime the array finishes with the code
maddoc42 said:
You're probably not looking for a specific algorithm, but rather for some technical guidance? How far along are you? Did you get the Bluetooth connection between the two to work? Are you building your own app?
Click to expand...
Click to collapse
Hi,
Yes i'm building my own app. We have split the work. Im responsible for the app development side.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I've drafted a state diagram of how I want my app to function.
Can anyone give me a hand on starting to implement this? I am fairly new to coding-just self learning.
Thanks,
Cookie :fingers-crossed:
Hi guy this is my first application android, i using android studio and i need the help. i long press in not show context menu to download the image, below I leave the code if someone is kind enough to give me help.
Code:
import android.content.Context;
import android.media.AudioManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
public class MainActivity extends AppCompatActivity {
WebView webView;
ProgressBar progressBar;
private AudioManager audio;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
webView = (WebView) findViewById(R.id.webView);
webView.setWebViewClient(new WebViewClient());
webView.getSettings().setSupportZoom(true);
webView.setVerticalScrollBarEnabled(true);
webView.getSettings().setJavaScriptEnabled(true);
webView.setHorizontalScrollBarEnabled(true);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setUseWideViewPort(true);
//webView.getSettings().setBuiltInZoomControls(true);
webView.loadUrl("https://alpha.wallhaven.cc/");
//Barra de progreso
progressBar = (ProgressBar) findViewById(R.id.progressBar);
webView.setWebChromeClient(new WebChromeClient() {
@Override
public void onProgressChanged(WebView view, int progress) {
progressBar.setProgress(0);
progressBar.setVisibility(View.VISIBLE);
MainActivity.this.setProgress(progress * 1000);
progressBar.incrementProgressBy(progress);
if (progress == 100) {
progressBar.setVisibility(View.GONE);
}
}
});
/*Adding shortcut for MainActivity
//on Home screen
Intent shortcutIntent = new Intent(getApplicationContext(),
MainActivity.class);
shortcutIntent.setAction(Intent.ACTION_MAIN);
Intent addIntent = new Intent();
addIntent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);
addIntent.putExtra(Intent.EXTRA_SHORTCUT_NAME, "HelloWorldShortcut");
addIntent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE,
Intent.ShortcutIconResource.fromContext(getApplicationContext(),
R.drawable.ic_launcher));
addIntent.putExtra("duplicate", false);
addIntent.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
getApplicationContext().sendBroadcast(addIntent);*/
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_UP:
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
return true;
case KeyEvent.KEYCODE_VOLUME_DOWN:
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
return true;
case KeyEvent.KEYCODE_BACK:
if (webView.canGoBack()) {
//if Back key pressed and webview can navigate to previous page
webView.goBack();
// go back to previous page
return true;
} else {
finish();
// finish the activity
}
return super.onKeyDown(keyCode, event);
default:
return false;
}
}
}
Goodmorning ,
I was dabbling with the parser of a web page through Android Studio, the problem is that the code I implemented can't take what i want, I'll explain:
on a website is a web page with the following html:
HTML:
</style>
</head>
<body>
<h1>TITLE PAGE</h1>
<h2><em></em></h2>
<h2>La data prossimae è:</h2>
<p><br />Lunedi 10/10/2016<br />Orario 13.00 - 18.00</p><input type="button" name="chiudi" value="Chiudi" onclick="javascript: self.close();" />
</body>
</html>
With the class JSOUP I'd like to take just the date which is enclosed within <p>, that is, "10/10/2016", is it possible? for now I could only print the page title or the entire text of the page.
here is the class code:
HTML:
package inducesmile.com.androidjsouphtmlparser;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.File;
import java.io.IOException;
public class MainActivity extends ActionBarActivity {
private Document htmlDocument;
private String htmlPageUrl = "website";
private TextView parsedHtmlNode;
private String htmlContentInStringFormat;
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_livepage);
parsedHtmlNode = (TextView)findViewById(R.id.html_content);
Button htmlTitleButton = (Button)findViewById(R.id.button);
htmlTitleButton.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View v) {
JsoupAsyncTask jsoupAsyncTask = new JsoupAsyncTask();
jsoupAsyncTask.execute();
}
});
}
[user=439709]@override[/user]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_livepage, menu);
return true;
}
[user=439709]@override[/user]
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class JsoupAsyncTask extends AsyncTask<Void, Void, Void> {
[user=439709]@override[/user]
protected void onPreExecute() {
super.onPreExecute();
}
[user=439709]@override[/user]
protected Void doInBackground(Void... params) {
try {
htmlDocument = Jsoup.connect(htmlPageUrl).get();
htmlContentInStringFormat = htmlDocument.text();
// htmlDocument.title();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
[user=439709]@override[/user]
protected void onPostExecute(Void result) {
parsedHtmlNode.setText(htmlContentInStringFormat);
}
}
}
Thanks to everyone for help!
More articles like this, you can visit HUAWEI Developer Forum and Medium.
Forum link: https://forums.developer.huawei.com/forumPortal/en/home
Medium link: https://medium.com/huawei-developers
It is a tradition to exchange business cards with new colleges or partners, but keeping physical business cards is not easy at all. To solve this problem, many apps and mini programs providing the electronic business card function have emerged. You must be wondering how to develop such a function for your app.
Try integrating HUAWEI Nearby Service and use its Nearby Message feature to quickly implement the point-to-point business card exchange function. Check out the function demo below.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
If you are interested in the implementation details, download the source code from GitHub. You can optimize the code based on your app requirements.
Github demo link: https://github.com/HMS-Core/hms-nearby-demo/tree/master/NearbyCardExchange
The development procedure is as follows:
1. Getting Started
If you are already a Huawei developer, skip this step. If you are new to Huawei Mobile Services (HMS), you need to configure app information in AppGallery Connect, enable Nearby Service on the HUAWEI Developers console, and integrate the HMS Core SDK. For details, please refer to the documentation.
2. Adding Permissions
Before using Nearby Message, add the network, Bluetooth, and location permissions. Add the following permissions to the AndroidManifest.xml file of your project:
Code:
<uses-permission android:name="android.permission.INTERNET " />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<!-- The location permission is also required in Android 6.0 or later. -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
1. Code Development
2.1 Submitting a Dynamic Permission Application
Ensure that the Bluetooth and location functions are enabled and the device has been connected to the Internet properly. Then submit a dynamic permission application for the location permission.
Code:
@Override
public void onStart() {
super.onStart();
getActivity().getApplication().registerActivityLifecycleCallbacks(this);
checkPermission();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
for (int i = 0; i < permissions.length; ++i) {
if (grantResults[i] != 0) {
showWarnDialog(Constants.LOCATION_ERROR);
}
}
}
private void checkPermission() {
if (!BluetoothCheckUtil.isBlueEnabled()) {
showWarnDialog(Constants.BLUETOOTH_ERROR);
return;
}
if (!LocationCheckUtil.isLocationEnabled(this.getActivity())) {
showWarnDialog(Constants.LOCATION_SWITCH_ERROR);
return;
}
if (!NetCheckUtil.isNetworkAvailable(this.getActivity())) {
showWarnDialog(Constants.NETWORK_ERROR);
return;
}
String[] deniedPermission = PermissionUtil.getDeniedPermissions(this.getActivity(), new String[] {
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION
});
if (deniedPermission.length > 0) {
PermissionUtil.requestPermissions(this.getActivity(), deniedPermission, 10);
}
}
2.2 Encapsulating the Business Card Publishing and Subscription APIs
When a subscribed business card message is detected by the onFound method, display it in the business card searching pop-up; when a business card message is no longer discoverable (onLost), delete it from the business card searching pop-up.
Code:
private MessageHandler mMessageHandler = new MessageHandler() {
@Override
public void onFound(Message message) {
CardInfo cardInfo = JsonUtils.json2Object(new String(message.getContent(), Charset.forName("UTF-8")),
CardInfo.class);
if (cardInfo == null) {
return;
}
mSearchCardDialogFragment.addCardInfo(cardInfo);
}
@Override
public void onLost(Message message) {
CardInfo cardInfo = JsonUtils.json2Object(new String(message.getContent(), Charset.forName("UTF-8")),
CardInfo.class);
if (cardInfo == null) {
return;
}
mSearchCardDialogFragment.removeCardInfo(cardInfo);
}
};
private void publish(String namespace, String type, int ttlSeconds, OnCompleteListener<Void> listener) {
Message message = new Message(JsonUtils.object2Json(mCardInfo).getBytes(Charset.forName("UTF-8")), type,
namespace);
Policy policy = new Policy.Builder().setTtlSeconds(ttlSeconds).build();
PutOption option = new PutOption.Builder().setPolicy(policy).build();
Nearby.getMessageEngine(getActivity()).put(message, option).addOnCompleteListener(listener);
}
private void subscribe(String namespace, String type, int ttlSeconds, OnCompleteListener<Void> listener,
GetCallback callback) {
Policy policy = new Policy.Builder().setTtlSeconds(ttlSeconds).build();
MessagePicker picker = new MessagePicker.Builder().includeNamespaceType(namespace, type).build();
GetOption.Builder builder = new GetOption.Builder().setPolicy(policy).setPicker(picker);
if (callback != null) {
builder.setCallback(callback);
}
Nearby.getMessageEngine(getActivity()).get(mMessageHandler, builder.build()).addOnCompleteListener(listener);
}
2.3 Processing the Business Card Exchange Menu
When two users exchange business cards face to face, exchange the business card exchange codes. When the business card message of the remote endpoint is published, subscribe to it.
Code:
private boolean onExchangeItemSelected() {
PinCodeDialogFragment dialogFragment = new PinCodeDialogFragment(passwrod -> {
MyCardFragment.this.publish(passwrod, passwrod, Policy.POLICY_TTL_SECONDS_MAX, result -> {
if (!result.isSuccessful()) {
String str = "Exchange card fail, because publish my card fail. exception: "
+ result.getException().getMessage();
Log.e(TAG, str);
Toast.makeText(getActivity(), str, Toast.LENGTH_LONG).show();
return;
}
MyCardFragment.this.subscribe(passwrod, passwrod, Policy.POLICY_TTL_SECONDS_INFINITE, ret -> {
if (!ret.isSuccessful()) {
MyCardFragment.this.unpublish(passwrod, passwrod, task -> {
String str = "Exchange card fail, because subscribe is fail, exception("
+ ret.getException().getMessage() + ")";
if (!task.isSuccessful()) {
str = str + " and unpublish fail, exception(" + task.getException().getMessage()
+ ")";
}
Log.e(TAG, str);
Toast.makeText(getActivity(), str, Toast.LENGTH_LONG).show();
});
return;
}
mSearchCardDialogFragment.setOnCloseListener(() -> {
MyCardFragment.this.unpublish(passwrod, passwrod, task -> {
if (!task.isSuccessful()) {
Toast.makeText(getActivity(), "Unpublish my card fail, exception: "
+ task.getException().getMessage(), Toast.LENGTH_LONG).show();
}
});
MyCardFragment.this.unsubscribe(task -> {
if (!task.isSuccessful()) {
Toast.makeText(getActivity(), "Unsubscribe fail, exception: "
+ task.getException().getMessage(), Toast.LENGTH_LONG).show();
}
});
});
mSearchCardDialogFragment.show(getParentFragmentManager(), "Search Card");
}, null);
});
});
dialogFragment.show(getParentFragmentManager(), "pin code");
return true;
}
2.4 Adding a Business Card to Favorites
When a user adds a business card to favorites, add the card to the favorites list; when a user removes a business card from favorites, remote the card from the favorites list. In addition, store related data locally.
Code:
@Override
public void onFavorite(CardInfo cardInfo, boolean isFavorite) {
if (isFavorite) {
mFavoriteMap.put(cardInfo.getId(), cardInfo);
} else {
mFavoriteMap.remove(cardInfo.getId());
}
Set<String> set = new HashSet<>(mFavoriteMap.size());
for (CardInfo card : mFavoriteMap.values()) {
set.add(JsonUtils.object2Json(card));
}
SharedPreferences sharedPreferences = getContext().getSharedPreferences("data", Context.MODE_PRIVATE);
sharedPreferences.edit().putStringSet(Constants.MY_FAVORITES_KEY, set).apply();
}
5. Conclusion
This demo uses Nearby Message feature of HUAWEI Nearby Service. What Nearby Message is capable of is more than just developing functions for exchanging business cards face-to-face. Here are some examples:
1. Face-to-face teaming in multiplayer sports games
2. Face-to-face round joining in board games
3. Near-field go-Dutch payment function
4. Music sharing
If you are interested and want to learn more, check our development guide at
https://developer.huawei.com/consumer/en/doc/development/HMS-Guides/nearby-service-introduction
Find more Huawei HMS development guides in the XDA HMS community forums.
I am creating a simple application in Android Studio for managing a device connected via wifi using the Volley library.
The app must do this: when you click on the On button the device must turn on and consequently show the image of a light bulb on, while when I click on the Off button the device must turn off and show the image of a light bulb off on the screen . In Postman the interaction with the device works correctly.
When I start the app and click on the on/off button nothing happens, that is, it always shows me an image of an unlit light bulb. The logcat gives me no errors.
By debugging I notice that when the sendAndRequestResponse() method is executed it does not enter the onResponse method but jumps directly to the setRetryPolicy method.
Can you kindly help me? I am a beginner.
MainActivity.java
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.SwitchCompat;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import java.text.BreakIterator;
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getName();
SwitchCompat switchButton;
LinearLayout imageViewLight;
private RequestQueue mRequestQueue;
TextView buttonState;
private StringRequest mStringRequest;
private String url = "https://192.168.130.13:8081/zeroconf/switch";
@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
switchButton=findViewById(R.id.switchButton);
imageViewLight=findViewById(R.id.linearL);
TextView buttonState;
buttonState = findViewById(R.id.buttonState);
switchButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
sendAndRequestResponse();
}
});
}
private void sendAndRequestResponse() {
mRequestQueue = Volley.newRequestQueue(this);
mStringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@override
public void onResponse(String response) {
TextView myTextView;
if (switchButton.isChecked()) {
imageViewLight.setBackgroundResource(R.drawable.light__02);
buttonState.setText("State : ON");
} else {
imageViewLight.setBackgroundResource(R.drawable.light__01);
buttonState.setText("State : OFF");
}
}
}, new Response.ErrorListener() {
@override
public void onErrorResponse(VolleyError error) {
Log.i(TAG,"Error :" + error.toString());
}
});
mStringRequest.setRetryPolicy(new RetryPolicy() {
@override
public int getCurrentTimeout() {
return 50000;
}
@override
public int getCurrentRetryCount() {
return 50000;
}
@override
public void retry(VolleyError error) throws VolleyError {
}
});
mRequestQueue.add(mStringRequest);
}
}