我正在尝试创建一个简单的Android应用程序,我可以使用它来扫描蓝牙低功耗(BLE)设备并将名称打印为Log。主要活动非常基础,我不需要检查,我想这没关系。扫描开始,但我没有结果。
的Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.s1080994.tid.findble">
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-feature
android:name="android.hardware.bluetooth_le"
android:required="true" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity.java
public class MainActivity extends AppCompatActivity {
private BluetoothAdapter mBluetoothAdapter = null;
private BluetoothLeScanner mBluetoothLeScanner = null;
public static final int REQUEST_BT_PERMISSIONS = 0;
public static final int REQUEST_BT_ENABLE = 1;
private boolean mScanning = false;
private Handler mHandler = null;
private Button btnScan = null;
private ScanCallback mLeScanCallback =
new ScanCallback() {
@Override
public void onScanResult(int callbackType, final ScanResult result) {
//super.onScanResult(callbackType, result);
Log.i("BLE", result.getDevice().getName());
}
@Override
public void onScanFailed(int errorCode) {
super.onScanFailed(errorCode);
Log.i("BLE", "error");
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnScan = (Button) findViewById(R.id.btnScan);
this.mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
this.mBluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner();
this.mHandler = new Handler();
checkBtPermissions();
enableBt();
}
public void onBtnScan(View v){
if (mScanning){
mScanning = false;
scanLeDevice(false);
btnScan.setText("STOP");
} else {
mScanning = true;
scanLeDevice(true);
btnScan.setText("SCAN");
}
}
public void checkBtPermissions() {
this.requestPermissions(
new String[]{
Manifest.permission.BLUETOOTH, Manifest.permission.BLUETOOTH_ADMIN
},
REQUEST_BT_PERMISSIONS);
}
public void enableBt(){
if (mBluetoothAdapter == null) {
// Device does not support Bluetooth
}
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_BT_ENABLE);
}
}
public void scanLeDevice(final boolean enable) {
//ScanSettings mScanSettings = new ScanSettings.Builder().setScanMode(ScanSettings.SCAN_MODE_BALANCED).setCallbackType(ScanSettings.CALLBACK_TYPE_ALL_MATCHES).build();
if (enable) {
mScanning = true;
Log.i("Scanning", "start");
mBluetoothLeScanner.startScan(mLeScanCallback);
} else {
Log.i("Scanning", "stop");
mScanning = false;
mBluetoothLeScanner.stopScan(mLeScanCallback);
}
}
}
答案 0 :(得分:2)
您需要启用位置/ gps设置才能扫描Android附近的BLE设备。请启用location / gps并尝试扫描。