Android棉花糖6.0.1蓝牙扫描未返回结果_Android_Bluetooth_Sdk

Android棉花糖6.0.1蓝牙扫描未返回结果

android bluetooth sdk

Android棉花糖6.0.1蓝牙扫描未返回结果,android,bluetooth,sdk,Android,Bluetooth,Sdk,根据Kitkat 4.4.4的update+appCompat，6.01中的蓝牙似乎无法按预期工作，具有以下代码和权限没有返回结果，我在附近发现了几个设备。有人知道为什么吗？我正在运行Nexus5 <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> <uses-permission android:name="android.permission.BLUETOOTH" />

根据Kitkat 4.4.4的update+appCompat，6.01中的蓝牙似乎无法按预期工作，具有以下代码和权限

没有返回结果，我在附近发现了几个设备。

有人知道为什么吗？我正在运行Nexus5

 <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();
                }
            }

        }
    };


}


包装蓝牙；
导入android.app.Activity；
导入android.bluetooth.BluetoothAdapter；
导入android.bluetooth.bluetooth设备；
导入android.content.BroadcastReceiver；
导入android.content.Context；
导入android.content.Intent；
导入android.content.IntentFilter；
导入android.os.Bundle；
导入android.view.view；
导入android.view.view.OnClickListener；
导入android.widget.ArrayAdapter；
导入android.widget.Button；
导入android.widget.ListView；
导入android.widget.Toast；
导入java.util.ArrayList；
公共类BluetoothScanActivity扩展活动{
//专用最终广播接收器FoundReceiver=null；
受保护的ArrayList foundDevices=新ArrayList（）；
私有ListView foundDevicesListView；
专用阵列适配器btArrayAdapter；
/**
*在首次创建活动时调用。
*/
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u蓝牙\u扫描仪）；
final BluetoothAdapter myBlueToothAdapter=BluetoothAdapter.getDefaultAdapter（）；
最终按钮scanb=（按钮）findviewbyd（R.id.Button）；
最终ListView foundDevicesListView=（ListView）findViewById（R.id.listView1）；
btArrayAdapter=新的ArrayAdapter（此，
android.R.layout.simple_list_item_1，foundDevices）；
FoundDeviceListView.setAdapter（btArrayAdapter）；
//打开蓝牙
if（myBlueToothAdapter==null）
Toast.makeText（BluetoothScannerActivity.this，“您的设备不支持蓝牙”，Toast.LENGTH\u LONG.show（）；
如果（！myBlueToothAdapter.isEnabled（）），则为else{
意向BtIntent=新意向（BluetoothAdapter.ACTION\u REQUEST\u ENABLE）；
startActivityForResult（BtIntent，0）；
Toast.makeText（BluetoothScannerActivity.this，“打开蓝牙”，Toast.LENGTH_LONG.show（）；
}
//扫描
scanb.setOnClickListener（新的OnClickListener（）{
公共void onClick（视图v）{
btArrayAdapter.clear（）；
myBlueToothAdapter.startDiscovery（）；
Toast.makeText（BluetoothScannerActivity.this，“扫描设备”，Toast.LENGTH_LONG.show（）；
}
});
registerReceiver（FoundReceiver，new IntentFilter（BluetoothDevice.ACTION_FOUND））；
IntentFilter筛选器=新IntentFilter(
BluetoothAdapter.ACTION_DISCOVERY_FINISHED）；
此注册表接收程序（FoundReceiver，filter）；
}
@凌驾
受保护的空onDestroy（）{
//TODO自动生成的方法存根
super.ondestory（）；
未注册接收人（FoundReceiver）；
}
private final BroadcastReceiver FoundReceiver=新的BroadcastReceiver（）{
@凌驾
公共void onReceive（上下文、意图）{
String action=intent.getAction（）；
//当发现发现发现新设备时
if（BluetoothDevice.ACTION_FOUND.equals（ACTION））{
//从Intent获取BluetoothDevice对象
BluetoothDevice=intent.getParcelableExtra（BluetoothDevice.EXTRA\u设备）；
如果（！foundDevices.contains（设备））{
foundDevices.add（设备）；
btArrayAdapter.notifyDataSetChanged（）；
}
}
//发现周期结束时
if（BluetoothAdapter.ACTION\u DISCOVERY\u FINISHED.equals（ACTION））{
if（foundDevices==null | | foundDevices.isEmpty（））{
Toast.makeText（BluetoothScannerActivity.this，“无设备”，Toast.LENGTH_LONG.show（）；
}
}
}
};
}

您知道，由于

棉花糖

，您的任务需要这些权限-

 <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

在用户接受这些权限后，您可以

startDiscovery（）

。如果他/她否认，你就无法发现这些设备。您可以在中检查用户操作

onRequestPermissionsResult（）

回调。

添加权限后，将min SDk版本更改为23-它可用于以下功能：

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();
                }
            }

        }
    };


}

package BluetoothScanGenerality；
导入android.bluetooth.BluetoothAdapter；
导入android.bluetooth.bluetooth设备；
导入android.content.BroadcastReceiver；
导入android.content.Context；
导入android.content.Intent；
导入android.content.IntentFilter；
导入android.os.Bundle；
导入android.support.v7.app.AppActivity；
导入android.view.view；
导入android.view.view.OnClickListener；
导入android.widget.ArrayAdapter；
导入android.widget.Button；
导入android.widget.ListView；
导入android.widget.Toast；
导入android.Manifest；
导入java.util.ArrayList；
公共类BluetoothScanActivity扩展了AppCompatActivity{
//专用最终广播接收器FoundReceiver=null；
受保护的ArrayList foundDevices=新ArrayList（）；
私有ListView foundDevicesListView；
专用阵列适配器btArrayAdapter；
/**
*在首次创建活动时调用。
*/
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u蓝牙\u扫描仪）；
final BluetoothAdapter myBlueToothAdapter=BluetoothAdapter.getDefaultAdapter（）；
最终按钮scanb=（按钮）findviewbyd（R.id.Button）；
最终ListView foundDevicesListView=（ListView）findViewById（R.id.listView1）；
btArrayAdapter=新的ArrayAdapter（此，
安德罗
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();
                }
            }

        }
    };


}

public void checkBTPermissions(){
    if(Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP){
            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
        }
    }else{
        Log.d(TAG, "checkBTPermissions: No need to check permissions. SDK version < LOLLIPOP.");
    }
}