从其活动之外找到按钮 [英] Locating a button from outside its activity

问题描述

大家好，我有Firebaselistener类，它侦听值1.当达到此值时，我希望按钮drawable更改.最初，我在主要活动中设置了所有这些功能，并且使用

Hi guys i have Firebaselistener class and it listens for the value of 1. when this value is reached i want the button drawable to change. Originally i had this all set up in my main activity and it worked ok using

if(dls==1){
m.setBackground(getResources().getDrawable(R.drawable.buttonbkground2));
}

在我的主要活动中，使用valueEventlistener并监听该值.

from with in my main activity using a valueEventlistener and listening for the value.

但是我现在设置了一个类来做同样的事情，我无法从主活动中访问按钮ID.

but now ive set up a class to do the same thing i cant access the button ids from the main activity.

public class RewardValueListener  implements ValueEventListener {

FirebaseAuth mAuth;
String userid;
int i;
View view;
String dls;
Button mButton;
Context c;

public RewardValueListener() {

}

@Override
public void onDataChange(DataSnapshot dataSnapshot) {

    mAuth = FirebaseAuth.getInstance();
    FirebaseUser user = mAuth.getCurrentUser();
    userid = user.getUid();
    dls = dataSnapshot.child(userid).child("counter").getValue(String.class);
    Log.d("tag", "Value: " + dls);
    i = Integer.parseInt(dls);
    if (i == 1) {

        Log.d("tag", "Congrats " + i);


        mButton.setBackground(c.getResources().getDrawable(R.drawable.buttonbkground2));

    }
}
@Override
public void onCancelled(FirebaseError firebaseError) {

}

***包含Code答案的代码编辑

***Code edit with crickets answer included

  public void getButton(Button button,Context context) {
    mButton = button;
    c=context;

}

我知道与调用视图有关，但是在哪里调用它呢?

i know its something to do with calling the view but how n where do i call it?

有人可以帮助我，告诉我我哪里出问题了吗

can somebody please help me and tell me where im going wrong thank you

***编辑好的，感谢@ cricket_007的回答，效果很好.现在，我可以执行代码了，可以调用Listener类来更改主要活动中的所有按钮，而不仅仅是一个按钮.

***Edit ok so thanks to @cricket_007 for his answer which works great. now i have the code working is there away to call my Listener class to change all the buttons in my main activity rather than just one.

如果按这种方式编写代码，对于每个按钮，我都能使它正常工作，但是有一种方法可以压缩它，这样我就不必溢出我的主要活动

i can get it to work if for every button if write the code this way but is there a way to condense it so i dont have to overflow my main activity

  RewardValueListener reward1 = new RewardValueListener();
    mListref.child("RewardsSystem").addValueEventListener(reward1);
    reward1.getButton(mstreaming,mcontext);
    RewardValueListener reward2 = new RewardValueListener();
    mListref.child("RewardsSystem").addValueEventListener(reward2);
    reward2.getButton(mcustom,mcontext);
    RewardValueListener reward3 = new RewardValueListener();
    mListref.child("RewardsSystem").addValueEventListener(reward3);
    reward3.getButton(mlauncher,mcontext);
    RewardValueListener reward4 = new RewardValueListener();
    mListref.child("RewardsSystem").addValueEventListener(reward4);
    reward4.getButton(mmovies,mcontext);
  ect ect....

推荐答案

只需添加到构造函数中即可.

Just add to the constructor.

final Button mButton;
final Context mContext;
public RewardValueListener(Context context, Button button) {
    mContext = context;
    mButton = button;
}   

并使用该按钮代替 findViewById 和 mContext.getResources()

注意:创建此类时，您需要有一个可用按钮

Note: you'll need to have a button available when you create this class

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