Android的棉花糖6.0.1蓝牙扫描没有返回结果 [英] Android Marshmallow 6.0.1 Bluetooth Scan Returning No Results
本文介绍了Android的棉花糖6.0.1蓝牙扫描没有返回结果的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
蓝牙6.01似乎具有以下code和权限每次更新+应用程序兼容性的奇巧4.4.4预计将无法正常工作。
无结果被返回，我在附近的几个发现的设备。
任何人有任何见解按为什么呢？我正在上的Nexus 5。
＆LT;使用许可权的android：NAME =android.permission.BLUETOOTH_ADMIN/＆GT;
＆LT;使用许可权的android：NAME =android.permission.BLUETOOTH/＆GT;
＆LT;使用许可权的android：NAME =android.permission.ACCESS_COARSE_LOCATION/＆GT;
＆LT;使用许可权的android：NAME =android.permission.ACCESS_FINE_LOCATION/＆GT;包bluetoothscanneractivity;进口android.app.Activity;
进口android.bluetooth.BluetoothAdapter;
进口android.bluetooth.BluetoothDevice;
进口android.content.BroadcastReceiver;
进口android.content.Context;
进口android.content.Intent;
进口android.content.IntentFilter;
进口android.os.Bundle;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.ArrayAdapter;
进口android.widget.Button;
进口android.widget.ListView;
进口android.widget.Toast;进口的java.util.ArrayList;公共类BluetoothScannerActivity延伸活动{
//私人最终的BroadcastReceiver FoundReceiver = NULL;
保护的ArrayList＆LT;＆BluetoothDevice类GT; foundDevices =新的ArrayList＆LT;＆BluetoothDevice类GT;（）;
私人的ListView foundDevicesListView;
私人ArrayAdapter＆LT;＆BluetoothDevice类GT; btArrayAdapter; / **
* 在第一次创建活动时调用。
* /
@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_bluetooth_scanner）;
最终BluetoothAdapter myBlueToothAdapter = BluetoothAdapter.getDefaultAdapter（）;
最终按钮scanb =（按钮）findViewById（R.id.button）;
最终的ListView foundDevicesListView =（ListView控件）findViewById（R.id.listView1）; btArrayAdapter =新ArrayAdapter＆LT;＆BluetoothDevice类GT;（这一点，
android.R.layout.simple_list_item_1，foundDevices）;
foundDevicesListView.setAdapter（btArrayAdapter）; //开启蓝牙
如果（myBlueToothAdapter == NULL）
Toast.makeText（BluetoothScannerActivity.this，您的设备不列入支持蓝牙，Toast.LENGTH_LONG）.show（）;
否则如果（！myBlueToothAdapter.isEnabled（））{
意图BtIntent =新意图（BluetoothAdapter.ACTION_REQUEST_ENABLE）;
startActivityForResult（BtIntent，0）;
Toast.makeText（BluetoothScannerActivity.this，打开蓝牙，Toast.LENGTH_LONG）.show（）;
}
//扫描
scanb.setOnClickListener（新OnClickListener（）{
公共无效的onClick（视图v）{
btArrayAdapter.clear（）;
myBlueToothAdapter.startDiscovery（）;
Toast.makeText（BluetoothScannerActivity.this扫描设备，Toast.LENGTH_LONG）.show（）; }
}）; registerReceiver（FoundReceiver，新的IntentFilter（BluetoothDevice.ACTION_FOUND））;
IntentFilter的过滤器=新的IntentFilter（
BluetoothAdapter.ACTION_DISCOVERY_FINISHED）;
this.registerReceiver（FoundReceiver，过滤器）; } @覆盖
保护无效的onDestroy（）{
// TODO自动生成方法存根
super.onDestroy（）;
unregisterReceiver（FoundReceiver）;
} 私人最终的BroadcastReceiver FoundReceiver =新的广播接收器（）{
@覆盖
公共无效的onReceive（上下文的背景下，意图意图）{ 字符串行动= intent.getAction（）; //当发现找到一个新设备
如果（BluetoothDevice.ACTION_FOUND.equals（动作））{
//从意向获取BluetoothDevice类对象
BluetoothDevice类设备= intent.getParcelableExtra（BluetoothDevice.EXTRA_DEVICE）;
如果（！foundDevices.contains（设备））{
foundDevices.add（设备）;
btArrayAdapter.notifyDataSetChanged（）;
}
} //当发现周期完成
如果（BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals（动作））{
如果（foundDevices == NULL || foundDevices.isEmpty（））{
Toast.makeText（BluetoothScannerActivity.this，无设备，Toast.LENGTH_LONG）.show（）;
}
} }
};
}
解决方案
通过添加权限，改变到最小SDK版本为23 - 它适用于以下内容：
包bluetoothscanneractivity;进口android.bluetooth.BluetoothAdapter;
进口android.bluetooth.BluetoothDevice;
进口android.content.BroadcastReceiver;
进口android.content.Context;
进口android.content.Intent;
进口android.content.IntentFilter;
进口android.os.Bundle;
进口android.support.v7.app.AppCompatActivity;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.ArrayAdapter;
进口android.widget.Button;
进口android.widget.ListView;
进口android.widget.Toast;
进口android.Manifest;进口的java.util.ArrayList;公共类BluetoothScannerActivity扩展AppCompatActivity {
//私人最终的BroadcastReceiver FoundReceiver = NULL;
保护的ArrayList＆LT;＆BluetoothDevice类GT; foundDevices =新的ArrayList＆LT;＆BluetoothDevice类GT;（）;
私人的ListView foundDevicesListView;
私人ArrayAdapter＆LT;＆BluetoothDevice类GT; btArrayAdapter; / **
* 在第一次创建活动时调用。
* /
@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_bluetooth_scanner）;
最终BluetoothAdapter myBlueToothAdapter = BluetoothAdapter.getDefaultAdapter（）; 最终按钮scanb =（按钮）findViewById（R.id.button）;
最终的ListView foundDevicesListView =（ListView控件）findViewById（R.id.listView1）; btArrayAdapter =新ArrayAdapter＆LT;＆BluetoothDevice类GT;（这一点，
android.R.layout.simple_list_item_1，foundDevices）; foundDevicesListView.setAdapter（btArrayAdapter）; //开启蓝牙
如果（myBlueToothAdapter == NULL）
Toast.makeText（BluetoothScannerActivity.this，您的设备犯规支持蓝牙，Toast.LENGTH_LONG）.show（）;
否则如果（！myBlueToothAdapter.isEnabled（））{
意图BtIntent =新意图（BluetoothAdapter.ACTION_REQUEST_ENABLE）;
startActivityForResult（BtIntent，0）;
Toast.makeText（BluetoothScannerActivity.this，打开蓝牙，Toast.LENGTH_LONG）.show（）;
} //快速权限检查
INT的PermissionCheck = this.checkSelfPermission（Manifest.permission.ACCESS_FINE_LOCATION）;
的PermissionCheck + = this.checkSelfPermission（Manifest.permission.ACCESS_COARSE_LOCATION）;
如果（的PermissionCheck！= 0）{ this.requestPermissions（新的String [] {Manifest.permission.ACCESS_FINE_LOCATION，Manifest.permission.ACCESS_COARSE_LOCATION}，1001）; //任意数量
}
scanb.setOnClickListener（新OnClickListener（）{
公共无效的onClick（视图v）{
btArrayAdapter.clear（）; myBlueToothAdapter.startDiscovery（）; Toast.makeText（BluetoothScannerActivity.this扫描设备，Toast.LENGTH_LONG）.show（）; }
}）; registerReceiver（FoundReceiver，新的IntentFilter（BluetoothDevice.ACTION_FOUND））;
IntentFilter的过滤器=新的IntentFilter（
BluetoothAdapter.ACTION_DISCOVERY_FINISHED）;
this.registerReceiver（FoundReceiver，过滤器）; } @覆盖
保护无效的onDestroy（）{
// TODO自动生成方法存根
super.onDestroy（）;
unregisterReceiver（FoundReceiver）;
}
私人最终的BroadcastReceiver FoundReceiver =新的广播接收器（）{
@覆盖
公共无效的onReceive（上下文的背景下，意图意图）{ 字符串行动= intent.getAction（）; //当发现找到一个新设备
如果（BluetoothDevice.ACTION_FOUND.equals（动作））{
//从意向获取BluetoothDevice类对象
BluetoothDevice类设备= intent.getParcelableExtra（BluetoothDevice.EXTRA_DEVICE）;
如果（！foundDevices.contains（设备））{
foundDevices.add（设备）;
Toast.makeText（BluetoothScannerActivity.this，姓名：+ device.getName（）++ device.getAddress（），Toast.LENGTH_LONG）.show（）;
btArrayAdapter.notifyDataSetChanged（）;
} } //当发现周期完成
如果（BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals（动作））{
如果（foundDevices == NULL || foundDevices.isEmpty（））{
Toast.makeText（BluetoothScannerActivity.this，无设备，Toast.LENGTH_LONG）.show（）;
}
} }
};
}
Bluetooth in 6.01 seems to be not working as expected with the following code and permissions as per update + appCompat for Kitkat 4.4.4.
No results are being returned and I have several discoverable devices in the vicinity.
Anyone have any insight as per why? I am running on a Nexus 5.
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
package bluetoothscanneractivity;
import android.app.Activity;
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.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
public class BluetoothScannerActivity extends Activity {
//private final BroadcastReceiver FoundReceiver = null;
protected ArrayList<BluetoothDevice> foundDevices = new ArrayList<BluetoothDevice>();
private ListView foundDevicesListView;
private ArrayAdapter<BluetoothDevice> btArrayAdapter;
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bluetooth_scanner);
final BluetoothAdapter myBlueToothAdapter = BluetoothAdapter.getDefaultAdapter();
final Button scanb = (Button) findViewById(R.id.button);
final ListView foundDevicesListView = (ListView) findViewById(R.id.listView1);
btArrayAdapter = new ArrayAdapter<BluetoothDevice>(this,
android.R.layout.simple_list_item_1, foundDevices);
foundDevicesListView.setAdapter(btArrayAdapter);
//Turn on Bluetooth
if (myBlueToothAdapter == null)
Toast.makeText(BluetoothScannerActivity.this, "Your device doesnot support Bluetooth", Toast.LENGTH_LONG).show();
else if (!myBlueToothAdapter.isEnabled()) {
Intent BtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(BtIntent, 0);
Toast.makeText(BluetoothScannerActivity.this, "Turning on Bluetooth", Toast.LENGTH_LONG).show();
}
//scan
scanb.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
btArrayAdapter.clear();
myBlueToothAdapter.startDiscovery();
Toast.makeText(BluetoothScannerActivity.this, "Scanning Devices", Toast.LENGTH_LONG).show();
}
});
registerReceiver(FoundReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
IntentFilter filter = new IntentFilter(
BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(FoundReceiver, filter);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(FoundReceiver);
}
private final BroadcastReceiver FoundReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a new device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (!foundDevices.contains(device)) {
foundDevices.add(device);
btArrayAdapter.notifyDataSetChanged();
}
}
// When discovery cycle finished
if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
if (foundDevices == null || foundDevices.isEmpty()) {
Toast.makeText(BluetoothScannerActivity.this, "No Devices", Toast.LENGTH_LONG).show();
}
}
}
};
}
解决方案
With the added permissions, changing to min SDk version to 23 - it works with the following:
package bluetoothscanneractivity;
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.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import android.Manifest;
import java.util.ArrayList;
public class BluetoothScannerActivity extends AppCompatActivity {
//private final BroadcastReceiver FoundReceiver = null;
protected ArrayList<BluetoothDevice> foundDevices = new ArrayList<BluetoothDevice>();
private ListView foundDevicesListView;
private ArrayAdapter<BluetoothDevice> btArrayAdapter;
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bluetooth_scanner);
final BluetoothAdapter myBlueToothAdapter = BluetoothAdapter.getDefaultAdapter();
final Button scanb = (Button) findViewById(R.id.button);
final ListView foundDevicesListView = (ListView) findViewById(R.id.listView1);
btArrayAdapter = new ArrayAdapter<BluetoothDevice>(this,
android.R.layout.simple_list_item_1, foundDevices);
foundDevicesListView.setAdapter(btArrayAdapter);
//Turn on Bluetooth
if (myBlueToothAdapter == null)
Toast.makeText(BluetoothScannerActivity.this, "Your device doesnt support Bluetooth", Toast.LENGTH_LONG).show();
else if (!myBlueToothAdapter.isEnabled()) {
Intent BtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(BtIntent, 0);
Toast.makeText(BluetoothScannerActivity.this, "Turning on Bluetooth", Toast.LENGTH_LONG).show();
}
// Quick permission check
int permissionCheck = this.checkSelfPermission("Manifest.permission.ACCESS_FINE_LOCATION");
permissionCheck += this.checkSelfPermission("Manifest.permission.ACCESS_COARSE_LOCATION");
if (permissionCheck != 0) {
this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 1001); //Any number
}
scanb.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
btArrayAdapter.clear();
myBlueToothAdapter.startDiscovery();
Toast.makeText(BluetoothScannerActivity.this, "Scanning Devices", Toast.LENGTH_LONG).show();
}
});
registerReceiver(FoundReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
IntentFilter filter = new IntentFilter(
BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(FoundReceiver, filter);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(FoundReceiver);
}
private final BroadcastReceiver FoundReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a new device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (!foundDevices.contains(device)) {
foundDevices.add(device);
Toast.makeText(BluetoothScannerActivity.this, "name: " + device.getName() + " " + device.getAddress(), Toast.LENGTH_LONG).show();
btArrayAdapter.notifyDataSetChanged();
}
}
// When discovery cycle finished
if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
if (foundDevices == null || foundDevices.isEmpty()) {
Toast.makeText(BluetoothScannerActivity.this, "No Devices", Toast.LENGTH_LONG).show();
}
}
}
};
}
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