Android 如何正确获取 Switch 的值？
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Android How do I correctly get the value from a Switch?
提问by stackoverflow
I'm creating a Androidapplication which uses a Switch.
I'm trying to listen for changes and get the value when changed.
I have two questions when using switches:
我正在创建一个Android使用Switch的应用程序。
我正在尝试侦听更改并在更改时获取值。
使用开关时我有两个问题：
- What
action listenerdo I use? - How do I get the the
switchvalue?
- 什么
action listener适合我？ - 我如何获得
switch价值？
回答by Kazekage Gaara
Switch s = (Switch) findViewById(R.id.SwitchID);
if (s != null) {
s.setOnCheckedChangeListener(this);
}
/* ... */
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
Toast.makeText(this, "The Switch is " + (isChecked ? "on" : "off"),
Toast.LENGTH_SHORT).show();
if(isChecked) {
//do stuff when Switch is ON
} else {
//do stuff when Switch if OFF
}
}
Hint: isCheckedis the new switch value [trueor false] not the old one.
提示：isChecked是新的开关值 [true或false] 不是旧的。
回答by dmon
Since it extends from CompoundButton(docs), you can use setOnCheckedChangeListener()to listen for changes; use isChecked()to get the current state of the button.
由于它是从CompoundButton( docs)扩展而来的，因此您可以使用它setOnCheckedChangeListener()来监听更改；用于isChecked()获取按钮的当前状态。
回答by Muhammad Numan
Switch switch = (Switch) findViewById(R.id.Switch2);
switch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
...switch on..
} else {
...switch off..
}
}
});
i hope this will solve your problem
我希望这能解决你的问题
回答by hiashutoshsingh
I added this in kotlin
我在 kotlin 中添加了这个
switchImage.setOnCheckedChangeListener { compoundButton: CompoundButton, b: Boolean ->
if (b) // Do something
else // Do something
}
