在android studio中扫描ble模块(蓝牙4.0)

概述我正在尝试开发一个应用来扫描BLE设备.但是,它只扫描一次.我尝试使用while循环来循环它但它挂在那里.扫描部分处于继续功能： package com.example.user.myfriend;import android.bluetooth.BluetoothAdapter;import android.bluetooth.BluetoothDevice;import android 我正在尝试开发一个应用来扫描BLE设备.但是,它只扫描一次.我尝试使用while循环来循环它但它挂在那里.扫描部分处于继续功能：

package com.example.user.myfrIEnd;import androID.bluetooth.BluetoothAdapter;import androID.bluetooth.BluetoothDevice;import androID.bluetooth.BluetoothManager;import androID.content.Context;import androID.content.Intent;import androID.graphics.color;import androID.os.Handler;import androID.support.v7.app.ActionBaractivity;import androID.os.Bundle;import androID.vIEw.Menu;import androID.vIEw.MenuItem;import androID.Widget.relativeLayout;import androID.Widget.TextVIEw;import androID.Widget.Toast;import org.w3c.dom.Text;public class MainActivity extends ActionBaractivity {BluetoothAdapter mBluetoothAdapter;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUetoOTH_SERVICE);    mBluetoothAdapter = bluetoothManager.getAdapter();    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    hello();}public voID hello() {    if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {        Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);        startActivityForResult(enableBluetooth,1);    }    proceed();}@OverrIDeprotected voID onActivityResult(int requestCode,int resultCode,Intent data) {    if (requestCode == 1) {        if (resultCode == RESulT_OK) {            proceed();        }    }    super.onActivityResult(requestCode,resultCode,data);}private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() {    public voID onLeScan(final BluetoothDevice device,final int RSSi,final byte[] scanRecord) {        int startByte = 2;        boolean patternFound = false;        while (startByte <= 5) {            if (((int) scanRecord[startByte + 2] & 0xff) == 0x02 && //IDentifIEs an iBeacon                    ((int) scanRecord[startByte + 3] & 0xff) == 0x15) { //IDentifIEs correct data length                patternFound = true;                break;            }            startByte++;        }        if (patternFound) {            //Convert to hex String            byte[] uuIDBytes = new byte[16];            System.arraycopy(scanRecord,startByte + 4,uuIDBytes,16);            String hexString = bytesToHex(uuIDBytes);            //Here is your UUID            String uuID = hexString.substring(0,8) + "-" +                    hexString.substring(8,12) + "-" +                    hexString.substring(12,16) + "-" +                    hexString.substring(16,20) + "-" +                    hexString.substring(20,32);            //Here is your Major value            int major = (scanRecord[startByte + 20] & 0xff) * 0x100 + (scanRecord[startByte + 21] & 0xff);            //Here is your Minor value            int minor = (scanRecord[startByte + 22] & 0xff) * 0x100 + (scanRecord[startByte + 23] & 0xff);            if (major == 1) {                relativeLayout hai = (relativeLayout) findVIEwByID(R.ID.hai);                hai.setBackgroundcolor(color.YELLOW);            }            if (major == 2) {                relativeLayout hai = (relativeLayout) findVIEwByID(R.ID.hai);                hai.setBackgroundcolor(color.RED);            }        }    }};private static String bytesToHex(byte[] bytes) {    final char[] hexArray = "0123456789ABCDEF".tochararray();    char[] hexChars = new char[bytes.length * 2];    for (int j = 0; j < bytes.length; j++) {        int v = bytes[j] & 0xFF;        hexChars[j * 2] = hexArray[v >>> 4];        hexChars[j * 2 + 1] = hexArray[v & 0x0F];    }    return new String(hexChars);}public voID proceed() {    boolean scanning = true;    mBluetoothAdapter.startLeScan(mLeScanCallback);    Handler handler = new Handler();    handler.postDelayed(new Runnable() {        //  @OverrIDe        public voID run() {            mBluetoothAdapter.stopLeScan(mLeScanCallback);        }    },50000000);}

}

如何让应用程序循环扫描？

解决方法 如果“通过循环扫描？”你的意思是检测所有附近的广播设备,你已经完成了.代码行：

mBluetoothAdapter.startLeScan(mLeScanCallback)

导致扫描开始.在扫描期间,将在发现每个广播设备时调用回调“mLeScanCallback”.扫描将一直有效,直到

mBluetoothAdapter.stopScan(mLeScanCallback)

叫做.在你的情况下,这将在很长一段时间后被调用：50000000毫秒.

也许您在该区域只有1个广播设备,因此您在测试时只能获得1个回调.

总结

以上是内存溢出为你收集整理的在android studio中扫描ble模块(蓝牙4.0)全部内容，希望文章能够帮你解决在android studio中扫描ble模块(蓝牙4.0)所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。