回复不及时，望见谅~
service建立连接的时候，可以使用一个ServiceConnection的onServiceConnected方法来完成权限的申请:
public class MainActivity extends Activity {
ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// 当service绑定成功时，会调用次方法，可以在此申请权限
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, 2);
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent i = new Intent(this, MyService.class);
bindService(i, conn, Context.BIND_AUTO_CREATE);
}
}
至于想在service中获得一个activity的对象，可以尝试在你的activity中添加一个静态的activity成员，供service类调用：
public class MainActivity extends Activity {
public static Activity mActivity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mActivity = this;
}
}
