扫描无法在Android Things DP3上运行的蓝牙设备。任何想法/解决方法？没有采取行动BluetoothDevice.ACTION_FOUND。
我已经在Android 6.0中添加了ACCESS_FINE_LOCATION和ACCESS_COARSE_LOCATION permisssion更改，但仍无效。 https://developer.android.com/about/versions/marshmallow/android-6.0-changes.html
还有android.permission.BLUETOOTH_ADMIN，android.permission.BLUETOOTH
我已经检查过，Android上的ACCESS_FINE_LOCATION或ACCESS_COARSE_LOCATION＆gt; = 6.0需要运行时权限，但由于Android内容限制而导致错误。
private void checkPermission() {
List<String> permissionsList = new ArrayList<String>();
List<String> permissionsNeeded = new ArrayList<String>();
// app
permissionsList.add(Manifest.permission.ACCESS_FINE_LOCATION);
permissionsList.add(Manifest.permission.ACCESS_COARSE_LOCATION);
permissionsList.add(Manifest.permission.ACCESS_WIFI_STATE);
permissionsList.add(Manifest.permission.SET_TIME_ZONE);
// AndroidThingsLib
permissionsList.add(Manifest.permission.BLUETOOTH_ADMIN);
permissionsList.add(Manifest.permission.BLUETOOTH);
permissionsList.add(Manifest.permission.CHANGE_WIFI_STATE);
permissionsList.add(Manifest.permission.INTERNET);
permissionsList.add(Manifest.permission.ACCESS_NETWORK_STATE);
for (int i = 0; i < permissionsList.size(); i++){
if (checkSelfPermission(permissionsList.get(i)) == PackageManager.PERMISSION_GRANTED) {
permissionsNeeded.add(permissionsList.get(i));
updateDataLogs(SourceEnum.System, "GRANTED: " + permissionsList.get(i));
} else {
permissionsNeeded.add(permissionsList.get(i));
updateDataLogs(SourceEnum.Error, "NOT GRANTED: " + permissionsList.get(i));
}
}
if (permissionsList.size()>0){
requestPermissions(permissionsNeeded.toArray(new String[permissionsNeeded.size()]),5678);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == 5678){
for (int i = 0; i < permissions.length; i++){
updateDataLogs(SourceEnum.Error, permissions[i] + " result " + grantResults[i]);
}
}
}
private void enableBluetoothScan() {
updateDataLogs(SourceEnum.System, "enableBluetoothScan");
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter);
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter.isEnabled()){
bluetoothAdapter.startDiscovery();
} else {
updateDataLogs(SourceEnum.Error, "Bluetooth Adapter not enabled");
}
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
updateDataLogs(SourceEnum.System, "DISCOVERY STARTED");
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
updateDataLogs(SourceEnum.System, "DISCOVERY FINISHED");
} else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
updateDataLogs(SourceEnum.System, "NEW DEVICE " + device.getName());
}
}
}
};
答案 0 :(得分：1)
如Platform Overview所述，Android Things不支持运行时权限授予，因为设备可能没有交互式显示来显示对话框。相反，Android Things会依赖于清单中请求的所有权限的安装时权限模型。这意味着调用requestPermissions()之类的方法不是必需的，也无法帮助您。
关于当前预览期间遇到的问题，以下摘录来自Release Notes：
在下次重启设备之前，不会授予应用程序请求的危险权限。这包括新应用安装和现有应用中的新元素。
目前，当您的应用请求危险权限（如位置权限）时，您需要在安装（一次性）后重新启动设备，以便在启动时授予这些权限。
答案 1 :(得分：0)
感谢你的解释，你已经做了什么，我能够克服这个问题。因为您没有将问题标记为已解决：
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
<!-- update this to your version of the Android SDK Tools -->
buildToolsVersion "25.0.3"
defaultConfig {
minSdkVersion 24
}
}
dependencies {
<!-- update this to your version of Android Things -->
provided 'com.google.android.things:androidthings:0.4-devpreview'
}
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package=" . . . ">
<!-- required for getState in startDiscovery -->
<uses-permission android:name="android.permission.BLUETOOTH"/>
<!-- required for startDiscovery -->
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<!-- required for the IntentFilter ACTION_FOUND -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<!-- change to your label -->
<application android:label="Intel Edison">
<uses-library android:name="com.google.android.things"/>
<!-- change to the name of your Main Activity -->
<activity android:name=".HomeActivity">
<!-- Launch activity as default from Android Studio -->
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<!-- Launch activity automatically on boot -->
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.IOT_LAUNCHER"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
</application>
</manifest>
HomeActivity.java：
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothDevice.ACTION_NAME_CHANGED);
registerReceiver(mReceiverBT, filter);
BluetoothAdapter mBtAdapter = BluetoothAdapter.getDefaultAdapter();
boolean started = mBtAdapter.startDiscovery();
if (false == started) {
<!-- in that case, catch BluetoothAdapter.STATE_ON in the receiver and start the Bluetooth Discovery then -->
mBtAdapter.enable();
}
使用此代码，我的应用程序在启动英特尔Edison开发板后立即启动，并能够发现附近的蓝牙设备。注意：