Question

我正在尝试在设备启动后启动服务。问题是服务需要一些通常以这种方式获得的参数：

public class ServiceClass extends Service {
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        searchString = (String) intent.getExtras().get(GET_SEARCHSTRING_AFTER_START);
        [...]   
        return START_STICKY;

    public  static final String GET_SEARCHSTRING_AFTER_START = "SEARCHVALUE";

    public class OnStartupStarter[...]

}

但是当设备启动时应该通过BroadcastReceiver启动服务时我不能放置searchString，因为这是由一个活动给出的。在设备启动后服务启动时，服务应该以设备关闭之前的searchString开始。

BroadcastReceiver是服务类的子类：

public static class OnStartupStarter extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {

        /* TODO: Start the service with the searchString it 
         * had before the device has been turned off...
         */
    }
}

通常服务启动如下：

private OnCheckedChangeListener ServiceSwitchCheckedStatusChanged 
= new OnCheckedChangeListener() {
     public void onCheckedChanged(CompoundButton buttonView,
            boolean isChecked) {
        Intent s = new Intent(getBaseContext(), ServiceClass.class);

        s.putExtra(ServiceClass.GET_SEARCHSTRING_AFTER_START, <ARGUMENT>);
        if(isChecked)
            startService(s);
        else
            stopService(s);
    }
};

Answer 1

在活动SharedPreference方法的onPause中保存最后一个搜索字符串，在收到BootCompleted广播时检索上一个搜索字符串并按常规方式启动您的服务。

<强>活动：

protected void onPause() {
    super.onPause();

    SharedPreferences pref = getSharedPreferences("my_pref", MODE_PRIVATE);
    SharedPreferences.Editor editor = pref.edit();
    editor.putString("last_search", mLastSearch);
    editor.commit();
}

<强>广播接收器：

public static class OnStartupStarter extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();

        if (action.equals(Intent.ACTION_BOOT_COMPLETED)) {
            SharedPreferences pref = context.getSharedPreferences("my_pref", MODE_PRIVATE);
            String lastSearch = pref.getString("last_search", null);
            if (lastSearch != null) {
                // TODO: Start service
            }
        }
    }
}

设备启动后如何获取启动服务的参数？

1 个答案: