如何在Android中为setOnClickListener创建if条件

Question

我想为setonclicklistener创建If condition，当评论的forapproval.getvisibility()==view.visibile值如下时，我为变量Comment(ImageButton)创建If Conditional

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

因为我在一个布局中有不同的设计和不同的功能，如果我创建*ex2Layout，它不是高效的*我想

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)

问题就在这里：

Edit.setOnClickListener(new View.OnClickListener() {

谁能建议我？

Answer 1

我认为您需要一个动态变量来创建if conditional for OnClick。我建议您尝试在崩溃点之前调试forRequest.getVisibility（）和forApproval.getVisibility()，这样您就可以看到结果并修复当前If Conditional的问题