[英]How to wait until service is bound?
我正在为我的应用程序编写蓝牙服务。 我对 android 中的服务了解不多,但我设法启动了一个服务并按照我想要的方式使用它。
当我尝试在 Activity 的onCreate()
方法上使用服务中的函数时,我的问题就出现在刚开始时(它没有足够的时间来绑定服务)。
我将代码结构化为 3 个类:
BluetoothService:实现服务的类
public class BluetoothService extends Service implements IScanService { private final IBinder bluetoothBinder = new BluetoothBinder(); @Override public IBinder onBind(Intent intent) { return bluetoothBinder; } public class BluetoothBinder extends Binder { public BluetoothService getService() { return BluetoothService.this; } } // Other functions }
BluetoothActivity:处理蓝牙服务连接的抽象类(用于可重用性)。
public abstract class BluetoothActivity extends AppCompatActivity { protected BluetoothService bluetoothService; protected volatile Boolean isBound = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Connecting to the service Intent intent = new Intent(this, BluetoothService.class); bindService(intent, connection, Context.BIND_AUTO_CREATE); } private ServiceConnection connection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName className, IBinder service) { BluetoothService.BluetoothBinder binder = (BluetoothService.BluetoothBinder) service; bluetoothService = binder.getService(); isBound = true; } @Override public void onServiceDisconnected(ComponentName className) { isBound = false; } }; // Other functions }
ScanActivity:从 BluetoothActivity 扩展的活动类,并在“onCreate()”上使用 BluetoothService 方法。
变量“isBound”旨在用于了解服务是否已绑定(或者我们是否必须等待)。
我试过的:
所以我的问题是如何等待 'onCreate()' 方法直到 'isBound' 为真?
我刚刚意识到我可以在BluetoothService
上创建两个函数并在onServiceConnected()
和onServiceDisconnected()
上调用它们:
private ServiceConnection connection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder binder) {
BluetoothActivity.this.onServiceConnected(name, (BluetoothService.BluetoothBinder) binder);
}
@Override
public void onServiceDisconnected(ComponentName name) {
BluetoothActivity.this.onServiceDisconnected(name);
}
};
protected void onServiceConnected(ComponentName name, BluetoothService.BluetoothBinder binder){
bluetoothService = binder.getService();
}
protected void onServiceDisconnected(ComponentName name){
bluetoothService = null;
}
然后在扩展类上覆盖它们:
@Override
protected void onServiceConnected(ComponentName name, BluetoothService.BluetoothBinder binder) {
super.onServiceConnected(name, binder);
//TODO
}
@Override
protected void onServiceDisconnected(ComponentName name) {
// TODO
super.onServiceDisconnected(name);
}
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