如何验证复选框即将被取消选中？

Question

在Android中，此代码是否验证复选框被单击以取消选中？

 public void onClick(View v) { 

     if (((CheckBox) v).isChecked()) { 
      Toast.makeText(IdentifyActivity.this, "clicked to check", Toast.LENGTH_LONG); 
     } 
     else{ 
      Toast.makeText(IdentifyActivity.this, "clicked to uncheck", Toast.LENGTH_LONG); 
     } 

Answer 1

您可以使用OnCheckedChangeListener。你必须实现回调

onCheckedChanged(CompoundButton buttonView, boolean isChecked) 

这就是你的任务通常完成的方式。您的代码工作，以及和可能，既approces之间没有真正的区别

Answer 2

CheckBox cb = (CheckBox) findViewById(R.id.myCheckBox); 

cb.setOnCheckedChangeListener(new OnCheckedChangeListener(){ 
    @Override 
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
     if (isChecked) { 
      // It's checked 
     } else { 
      // It's not checked 
     } 
    } 
}); 

Answer 3

checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 

    @Override 
    public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) { 

     if(isChecked==true) 
     { 
      //your checkbox is checked 
      } 
     else 
     { 
      //your checkbox is not checked 
      } 

    } 
}