onclicklistener

问题 I have a star image in action bar. When I click on it, then the image should change to ON star. This is working fine. But how to know whether image is at ON state or OFF state.I want something that, if the image is at OFF mode and user taps on ON star, then it should set to ON star image. Initially, the image is set to OFF mode. So for this, I've wrote give line to turn on as user tap on it : v.setBackgroundResource(android.R.drawable.star_big_on); Guys pls suggest me for OFF mode if star

问题 I'm looking for a method of programmatically changing the state of an Android Switch widget using switch.setChecked(true); without triggering OnCheckedChangedlistener . My first thought was to swap it out for an OnClickListener but as this only registers clicks and you are able to not only click but also slide a Switch then it's not really fit for purpose as if the user was to slide the Switch from off to on then the Switch would actually do nothing as the user is not clicking... If anyone's

问题 I'm looking for a method of programmatically changing the state of an Android Switch widget using switch.setChecked(true); without triggering OnCheckedChangedlistener . My first thought was to swap it out for an OnClickListener but as this only registers clicks and you are able to not only click but also slide a Switch then it's not really fit for purpose as if the user was to slide the Switch from off to on then the Switch would actually do nothing as the user is not clicking... If anyone's

问题 When i run this program, it repeatedly saying that "cannot resolve symbol setOnClickListener".anyone please help me to solve this problem. import android.support.v7.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.view.View.OnClickListener; import android.widget.TextView; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle

问题 This question already has answers here : How do I detect a click outside an element? (84 answers) Closed 2 years ago . This is not a new problem on stackoverflow, but I've tried everything without success. I have a "popup" created with two divs. The parent ist the background and the child is the popup content. I want to hide the popup when the user clicks on the background (the parent). It sounds extremly easy also for me but I can't achieve that. This is my code and what I tried (it works

问题 This question already has answers here : How do I detect a click outside an element? (84 answers) Closed 2 years ago . This is not a new problem on stackoverflow, but I've tried everything without success. I have a "popup" created with two divs. The parent ist the background and the child is the popup content. I want to hide the popup when the user clicks on the background (the parent). It sounds extremly easy also for me but I can't achieve that. This is my code and what I tried (it works

问题 What I have tried: public class EntryAdapter extends ArrayAdapter<Item> { private Context context; private ArrayList<Item> items; private LayoutInflater vi; public EntryAdapter(Context context,ArrayList<Item> items) { super(context,0, items); this.context = context; this.items = items; vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public View getView(int position, final View convertView, ViewGroup parent) { // // // // NON-FUNCTIONING CODE BELOW

问题 What I have tried: public class EntryAdapter extends ArrayAdapter<Item> { private Context context; private ArrayList<Item> items; private LayoutInflater vi; public EntryAdapter(Context context,ArrayList<Item> items) { super(context,0, items); this.context = context; this.items = items; vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public View getView(int position, final View convertView, ViewGroup parent) { // // // // NON-FUNCTIONING CODE BELOW

问题 What I have tried: public class EntryAdapter extends ArrayAdapter<Item> { private Context context; private ArrayList<Item> items; private LayoutInflater vi; public EntryAdapter(Context context,ArrayList<Item> items) { super(context,0, items); this.context = context; this.items = items; vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public View getView(int position, final View convertView, ViewGroup parent) { // // // // NON-FUNCTIONING CODE BELOW

问题 I am confused: why with inline onlick, we have to write onclick="hello()", but in JS, we should write btn.onclick=hello or btn.addEventListener('click',hello); for regular function, why with inline onlick, "this" refers to window, but with js call, "this" refers to button. I don't understand last two buttons according to w3school, In a function, this refers to the global object. https://www.w3schools.com/js/js_this.asp In regular functions the this keyword represented the object that called