Je fais une application bluetooth en utilisant android studio et le problème est que l'application ne scanne qu'une seule fois les périphériques. Après avoir trouvé un appareil, il ne recherche plus d'autres appareils. Je souhaite rechercher tous les appareils disponibles autour de mon appareil. Le code d'activité est:Seul un périphérique est détecté en bluetooth
package com.example.yubrajsharma.my_application;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.ProgressBar;
import java.util.ArrayList;
import static android.view.View.INVISIBLE;
public class MainActivity extends AppCompatActivity{
BluetoothAdapter mBluetoothAdapter;
int count;
Button lister;
public ArrayList<BluetoothDevice> mBTDevices = new ArrayList<>();
String[] mBTDevice;
ArrayAdapter<String> adapter;
private static final String TAG = "MainActivity";
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(mBluetoothAdapter.ACTION_STATE_CHANGED)) {
final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, mBluetoothAdapter.ERROR);
}
}
};
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mReceiver);
unregisterReceiver(mReciever);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ProgressBar pg = (ProgressBar) findViewById(R.id.progressBar);
pg.setVisibility(View.INVISIBLE);
Button searchbtn = (Button) findViewById(R.id.searchbtn);
Button lister = (Button) findViewById(R.id.lists);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter.isEnabled()){
lister.setVisibility(View.VISIBLE);
}
lister.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listdata();
}
});
}
private BroadcastReceiver mReciever = new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
ProgressBar pg = (ProgressBar) findViewById(R.id.progressBar);
if (action.equals(BluetoothDevice.ACTION_FOUND)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
mBTDevices.add(device);
}
count = mBTDevices.size();
int j = 0;
mBTDevice = new String[count];
if(count>0) {
for (BluetoothDevice device : mBTDevices) {
mBTDevice[j] = device.getName();
j++;
}
ListView pairing = (ListView) findViewById(R.id.paired);
adapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,mBTDevice);
pairing.setAdapter(adapter);
}
else{
mBTDevice[0] = "no devices found";
ListView pairing = (ListView) findViewById(R.id.paired);
adapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,mBTDevice);
pairing.setAdapter(adapter);
}
mBluetoothAdapter.cancelDiscovery();
pg.setVisibility(View.INVISIBLE);
Log.d(TAG, "Disabled");
}
};
private void listdata() {
if(mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
mBluetoothAdapter.startDiscovery();
ProgressBar pg = (ProgressBar) findViewById(R.id.progressBar);
pg.setVisibility(View.VISIBLE);
IntentFilter infill = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReciever, infill);
}
public void enableDisableBT(View view) {
Button lister = (Button) findViewById(R.id.lists);
if(!mBluetoothAdapter.isEnabled()){
Intent enableBTintent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivity(enableBTintent);
IntentFilter btIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mReceiver, btIntent);
}
if(mBluetoothAdapter.isEnabled()){
mBluetoothAdapter.disable();
IntentFilter btIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mReceiver, btIntent);
}
}
}
Le code pour le fichier xml est:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.yubrajsharma.my_application.MainActivity"
tools:layout_editor_absoluteY="81dp"
tools:layout_editor_absoluteX="0dp">
<Button
android:id="@+id/lists"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="List Devices"
android:visibility="invisible"
app:layout_constraintLeft_toRightOf="@+id/searchbtn"
app:layout_constraintBottom_toBottomOf="@+id/searchbtn"
android:layout_marginRight="28dp"
android:layout_marginEnd="28dp"
android:layout_alignParentTop="true"
android:layout_alignRight="@+id/paired"
android:layout_alignEnd="@+id/paired" />
<Button
android:id="@+id/searchbtn"
android:onClick="enableDisableBT"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ON/OFF"
android:visibility="visible"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="3dp" />
<ListView
android:id="@+id/paired"
android:layout_width="368dp"
android:layout_height="422dp"
app:layout_constraintTop_toBottomOf="@+id/lists"
app:layout_constraintLeft_toLeftOf="@+id/searchbtn"
android:layout_marginBottom="13dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ProgressBar
android:id="@+id/progressBar"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginEnd="29dp"
android:layout_marginRight="29dp"
android:layout_toLeftOf="@+id/lists"
android:layout_toStartOf="@+id/lists"
tools:visibility="invisible" />
</RelativeLayout>
Comment numériser tous les périphériques disponibles?