Java 从广播接收器(蓝牙)返回值
我正试图通过实现自己的android蓝牙库来进行蓝牙聊天。我希望在图形部分和逻辑部分之间有一个清晰的分离(模块化) 为了获得蓝牙设备的列表,我通过编程在我的BluetoothManager类(库)中注册了一个新的BroadcastReceiver 我希望将这些值返回或存储在此类中的数组中,以便可以从我的(外部)活动/片段访问它们 我该怎么做 这是BluetoothManager(库)中的代码:Java 从广播接收器(蓝牙)返回值,java,android,asynchronous,bluetooth,Java,Android,Asynchronous,Bluetooth,我正试图通过实现自己的android蓝牙库来进行蓝牙聊天。我希望在图形部分和逻辑部分之间有一个清晰的分离(模块化) 为了获得蓝牙设备的列表,我通过编程在我的BluetoothManager类(库)中注册了一个新的BroadcastReceiver 我希望将这些值返回或存储在此类中的数组中,以便可以从我的(外部)活动/片段访问它们 我该怎么做 这是BluetoothManager(库)中的代码: public class BluetoothManager { private Blueto
public class BluetoothManager {
private BluetoothAdapter bluetoothAdapter;
private Context context;
public BluetoothManager(Context context) {
this.context = context;
this.bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Log.d("[BluetoothManager]", "Error device does not support Bluetooth");
}
}
// Create a BroadcastReceiver for ACTION_FOUND.
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object and its info from the Intent.
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add value into an array or return --> TODO
}
}
};
public void discovery(){
// Check if the device is already "discovering". If it is, then cancel discovery.
if (bluetoothAdapter.isDiscovering()) {
bluetoothAdapter.cancelDiscovery();
}
// Start Discovery
bluetoothAdapter.startDiscovery();
// Register for broadcasts when a device is discovered.
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
context.getApplicationContext().registerReceiver(mReceiver, filter);
}
...
}
public class TabFragment extends ListFragment implements AdapterView.OnItemClickListener {
private BluetoothManager bluetoothManager;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View fragmentView = inflater.inflate(R.layout.fragment_tab_fragment2, container, false);
Button button = fragmentView.findViewById(R.id.button2);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
bluetoothManager = new BluetoothManager(getContext());
if(bluetoothManager.activeBluetooth()){
bluetoothManager.discovery();
// Get Values here --> TODO
}
}
});
// Add return values into a list
//final String[] items = ...;
final ArrayAdapter<String> aa = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, items);
setListAdapter(aa);
return fragmentView;
}
}
这是片段中的代码:
public class BluetoothManager {
private BluetoothAdapter bluetoothAdapter;
private Context context;
public BluetoothManager(Context context) {
this.context = context;
this.bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Log.d("[BluetoothManager]", "Error device does not support Bluetooth");
}
}
// Create a BroadcastReceiver for ACTION_FOUND.
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object and its info from the Intent.
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add value into an array or return --> TODO
}
}
};
public void discovery(){
// Check if the device is already "discovering". If it is, then cancel discovery.
if (bluetoothAdapter.isDiscovering()) {
bluetoothAdapter.cancelDiscovery();
}
// Start Discovery
bluetoothAdapter.startDiscovery();
// Register for broadcasts when a device is discovered.
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
context.getApplicationContext().registerReceiver(mReceiver, filter);
}
...
}
public class TabFragment extends ListFragment implements AdapterView.OnItemClickListener {
private BluetoothManager bluetoothManager;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View fragmentView = inflater.inflate(R.layout.fragment_tab_fragment2, container, false);
Button button = fragmentView.findViewById(R.id.button2);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
bluetoothManager = new BluetoothManager(getContext());
if(bluetoothManager.activeBluetooth()){
bluetoothManager.discovery();
// Get Values here --> TODO
}
}
});
// Add return values into a list
//final String[] items = ...;
final ArrayAdapter<String> aa = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, items);
setListAdapter(aa);
return fragmentView;
}
}
公共类TabFragment扩展ListFragment实现AdapterView.OnItemClickListener{
私人BluetoothManager BluetoothManager;
@凌驾
CreateView上的公共视图(布局、充气机、视图组容器、捆绑包保存状态){
视图碎片视图=充气机。充气(R.layout.fragment\u tab\u fragment2,容器,错误);
Button Button=fragmentView.findViewById(R.id.button2);
setOnClickListener(新视图.OnClickListener(){
公共void onClick(视图v){
bluetoothManager=新的bluetoothManager(getContext());
if(bluetoothManager.activeBluetooth()){
bluetoothManager.discovery();
//在此处获取值-->待办事项
}
}
});
//将返回值添加到列表中
//最终字符串[]项=。。。;
最终ArrayAdapter aa=新的ArrayAdapter(getActivity(),
android.R.layout.simple_list_item_1,items);
setListAdapter(aa);
返回碎片视图;
}
}
您不能将广播接收器的值作为其事件驱动返回。您可以在onReceive()中将这些值全局保存到集合中(在同一个类中或在单例包装类中),然后在整个应用程序中使用它
要发送值更新回调,另一个本地广播接收器将很有帮助 不能将值从广播接收器返回为其事件驱动。您可以在onReceive()中将这些值全局保存到集合中(在同一个类中或在单例包装类中),然后在整个应用程序中使用它
要发送值更新回调,另一个本地广播接收器将很有帮助 发现可用蓝牙设备的列表是异步的。在接收广播时,BluetoothManager类可以将更新后的设备列表保存在一个列表成员变量中,并公开一个公共getter方法来从活动或片段中检索它。此外,考虑将侦听器暴露到您的活动中,以提供更新的列表,因为设备可以动态地添加或删除。在任何时间点,UI在收到更新的设备列表时都应该刷新自己
public void onClick(视图v){
bluetoothManager=新的bluetoothManager(getContext());…}
这是个坏主意。理想情况下,您必须在创建活动或片段时实例化BluetoothManager类,以便在用户单击按钮之前找到设备列表
我的建议是:
public interface BluetoothDevicesAvailable {
void onBluetoothDeviceListChanged(List<BluetoothDevice> deviceList);
}
public class SomeActivity implements BluetoothDevicesAvailable {
//... Some code
@Override
public void onBluetoothDeviceListChanged(List<BluetoothDevice> deviceList) {
//Add your logic here to update UI
}
}
公共接口蓝牙设备可用{
更改Bluetooth设备列表时无效(列出设备列表);
}
公共类SomeActivity实现BluetoothDevicesAvailable{
//…一些代码
@凌驾
Bluetooth设备列表上的公共无效已更改(列出设备列表){
//在此处添加逻辑以更新UI
}
}
发现可用蓝牙设备的列表是异步的。在接收广播时,BluetoothManager类可以将更新后的设备列表保存在一个列表成员变量中,并公开一个公共getter方法来从活动或片段中检索它。此外,考虑将侦听器暴露到您的活动中,以提供更新的列表,因为设备可以动态地添加或删除。在任何时间点,UI在收到更新的设备列表时都应该刷新自己
public void onClick(视图v){
bluetoothManager=新的bluetoothManager(getContext());…}
这是个坏主意。理想情况下,您必须在创建活动或片段时实例化BluetoothManager类,以便在用户单击按钮之前找到设备列表
我的建议是: