android – 尝试从ContentObserver触发一个intent

我想从ContentObserver的onChange()方法中激活一个intent.我正在尝试在发送SMS时运行服务,因此ContentObserver,但 Eclipse给我错误,因为它无法解析“上下文”.下面是我的课程代码.

public class SmsObserver extends ContentObserver {

public SmsObserver(Handler handler) {
    super(handler);
    // TODO Auto-generated constructor stub
}

@Override
public void onChange(boolean selfChange) {
    super.onChange(selfChange);

    // On outgoing SMS,do this
    Intent update = new Intent(context,UpdateService.class);
    PendingIntent pendingIntent = PendingIntent.getService(context,update,0);

    try {
        pendingIntent.send();
    } catch (CanceledException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    }
}

解决方法

您是否有某些原因在创建实例时无法将应用程序上下文传递给SmsObserver？

public class SmsObserver extends ContentObserver {

    private Context context;
    public SmsObserver(Handler handler,Context context) {
        super(handler);
        this.context = context;
    }
}

调用类：

new SmsObserver(handler,getApplicationContext())