Question

我想为setOnCLickListener创建If Conditional，当Comment的( ImageButton )值类似

时，我创建条件变量Comment forApproval.getVisibility() == View.VISIBLE

ImageButton Comment = (ImageButton) fidViewById(R.id.apprComment);

因为我在一个布局和不同的功能中有不同的设计，如果我创建* ex 2layout它没有效率*我认为

final LinearLayout forApproval = (LinearLayout) findViewById(R.id.ForApproval);
final LinearLayout forRequest = (LinearLayout) findViewById(R.id.ForRequest);

ImageButton Comment = null;
ImageButton Edit = null;

if (forApproval.getVisibility() == View.VISIBLE) {
    Comment = (ImageButton) findViewById(R.id.apprComment);
}

// I Want to create multi value in Edit, example in here
if (forRequest.getVisibility() == View.VISIBLE) {
    Edit = (ImageButton) findViewById(R.id.reqEdit);
}

if (forApproval.getVisibility() == View.VISIBLE) {
    Edit = (ImageButton) findViewById(R.id.apprEdit);
}

// I have some ImageButton in Layout, each ImageButton has a different id
// and i want to make if conditional example like ImageButton ( in LinearLayout ) 
// is VISIBLE value of Edit is ImageButton with id reqEdit otherwise is 
// ImageButton in ( LinearLayout VISIBLE value of Edit is ImageButton with id apprEdit


Edit.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
           // TODO your Script
    }
});

Comment.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
           // TODO your Script
    }
});

但我有错误：

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageButton.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
                                                                           at dca.application.taaku.hr.AttendandItemId.onCreate(AttendandItemId.java:194)

问题在于：

Edit.setOnClickListener(new View.OnClickListener() {

任何人都可以建议我吗？

Answer 1

试试这个：将Click条件赋予clicklistener

Comment = (ImageButton) findViewById(R.id.apprComment);
Edit = (ImageButton) findViewById(R.id.reqEdit);

if (forRequest.getVisibility() == View.VISIBLE) {
    Edit.setOnClickListener(new View.OnClickListener() {

         @Override
         public void onClick(View arg0) {
         // TODO your Script
         }
    });
}
if (forApproval.getVisibility() == View.VISIBLE) {
    Comment.setOnClickListener(new View.OnClickListener() {

         @Override
         public void onClick(View arg0) {
         // TODO your Script
         }
     });
}

Answer 2

试试这个

Edit.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
       if (forRequest.getVisibility() == View.VISIBLE) {
         // perform your action here
       }
    }
});

Comment.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
      if (forApproval.getVisibility() == View.VISIBLE) {
         // perform your action here
      }
    }
});

Answer 3

NullPointer异常是因为forApproval和forRequest视图都不可见，因此ImageButton Edit为null。尝试在崩溃点之前调试forRequest.getVisibility（）和forApproval.getVisibility（），以便解决当前问题。但如果这些代码在onCreate（）中，那么你将面临更多的问题，最好以不同的方式命名reqEdit和apprEdit。

Answer 4

只有当forApproval可见时才会初始化注释，因为在其他情况下它是null，如果两者都不可见则为编辑相同

试试这个

final LinearLayout forApproval = (LinearLayout) findViewById(R.id.ForApproval);
final LinearLayout forRequest = (LinearLayout) findViewById(R.id.ForRequest);

ImageButton Comment ;
ImageButton Edit = null;

if (forRequest.getVisibility() == View.VISIBLE) {
    Edit = (ImageButton) findViewById(R.id.reqEdit);
}
if (forApproval.getVisibility() == View.VISIBLE) {
    Comment = (ImageButton) findViewById(R.id.apprComment);
    Edit = (ImageButton) findViewById(R.id.apprEdit);
}
 if(Comment!=null){

   Comment.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
           // TODO your Script
    }
});}
if(Edit!=null){
    Edit.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
           // TODO your Script
    }
});}

Answer 5

我有2个解决方案，

SOLUTION 1

int REQUEST=1,APPROVAL=2, FORWHAT=0;

if (forRequest.getVisibility() == View.VISIBLE) {
    Edit = (ImageButton) findViewById(R.id.reqEdit);
    FORWHAT=REQUEST;
}

if (forApproval.getVisibility() == View.VISIBLE) {
    Edit = (ImageButton) findViewById(R.id.apprEdit);
    FORWHAT=APPROVAL;
}

Edit.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
           // TODO your Script
      if(FORWHAT==REQUEST){
            //TODO request code
      }else if(FORWHAT==APPROVAL){
            //TODO approval code
      }else{
           //TODO something else
      }
    }
});

<强> SOLUTION 2

ImageButton comment; //variable starts with small letters.
ImageButton editRequest,editApproval;

 comment = (ImageButton) findViewById(R.id.apprComment);
 editRequest = (ImageButton) findViewById(R.id.reqEdit);
 editApproval = (ImageButton) findViewById(R.id.apprEdit);

comment.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
           // TODO your Script
    }
});
editRequest.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
           // TODO your Script
    }
});
editApproval.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
           // TODO your Script
    }
});
if (forApproval.getVisibility() == View.VISIBLE) {
    comment.setVisibility(View.VISIBLE);
}

// I Want to create multi value in Edit, example in here
if (forRequest.getVisibility() == View.VISIBLE) {
    editRequest.setVisibility(View.VISIBLE);
    editApproval.setVisibility(View.GONE);
}

if (forApproval.getVisibility() == View.VISIBLE) {
    editApproval.setVisibility(View.VISIBLE);
    editRequest.setVisibility(View.GONE);
}

Answer 6

我认为你需要一个动态变量来创建OnClick的条件。我建议你在崩溃点之前尝试调试forRequest.getVisibility（）和forApproval.getVisibility（），这样你就可以看到结果并解决If Conditional的当前问题

如何在Android中为setOnClickListener创建条件

6 个答案: