如何访问振动器在android系统在不延长活性的一类？ [英] How to access vibrator in android in a class that is not extending activity?

问题描述

我想用下面的类名为VibrationManager访问振动器和类不延长活动

I'm trying to access the vibrator using the following in class called VibrationManager and the class is not extending Activity

Vibrator v =(Vibrator) getSystemService(Context.VIBRATOR_SERVICE);

但是Eclipse罚球和错误，如

but eclipse throws and error like

该方法getSystemService（字符串）是未定义的类型VibrationManager

The method getSystemService(String) is undefined for the type VibrationManager

这是我的全班

public class VibrationManager {

private static VibrationManager me = null;

Vibrator v = null;

private Vibrator getVibrator(){
    if(v == null){
        v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
    }
    return v;
}

public static VibrationManager getManager() {
    if(me == null){
        me = new VibrationManager();
    }
    return me;
}

public void vibrate(long[] pattern){

}

}

请帮忙

推荐答案

您类没有方法 getSystemService ，因为这个类这么想的扩展活动。

Your class doesn't have the method getSystemService since this class dosen't extend a Activity.

如果您wan't使用你需要你的类 getSystemService 方法 VibrationManager 扩展活动，或者你需要接收的一个方面。

If you wan't to use the getSystemService method you need your class VibrationManager to extend an activity or you need to receive a context for that.

只要改变你的code使用一个背景下，你需要在你的静态调用也获得了环境。

Just change your code to use a context, for that you will need to also get a context in your static call.

public class VibrationManager {

    private static VibrationManager me;
    private Context context;

    Vibrator v = null;

    private Vibrator getVibrator(){
        if(v == null){
            v = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
        }
        return v;
    }

    public static VibrationManager getManager(Context context) {
        if(me == null){
            me = new VibrationManager();
        }
        me.setContext(context);
        return me;
    }

    private void setContext(Context context){
        this.context = context;
    }

    public void vibrate(long[] pattern){

    }
}

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