我想知道是否有一种方法来处理用户在输入EditText时按下Enter,就像onSubmit HTML事件。
还想知道是否有一种方法来操纵虚拟键盘,以这样的方式,“完成”按钮被标记为其他的东西(例如“Go”),并在单击时执行特定的动作(再次,像onSubmit)。
我想知道是否有一种方法来处理用户在输入EditText时按下Enter,就像onSubmit HTML事件。
还想知道是否有一种方法来操纵虚拟键盘,以这样的方式,“完成”按钮被标记为其他的东西(例如“Go”),并在单击时执行特定的动作(再次,像onSubmit)。
当前回答
检测回车键被按下的最简单的方法是:
mPasswordField.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (event!= null) { // KeyEvent: If triggered by an enter key, this is the event; otherwise, this is null.
signIn(mEmailField.getText().toString(), mPasswordField.getText().toString());
return true;
} else {
return false;
}
}
});
其他回答
下面是一个简单的静态函数,您可以将它扔到Utils或keyboard类中,当用户敲击硬件或软件键盘上的返回键时,它将执行代码。这是@earlcasper精彩回答的修改版
/**
* Return a TextView.OnEditorActionListener that will execute code when an enter is pressed on
* the keyboard.<br>
* <code>
* myTextView.setOnEditorActionListener(Keyboards.onEnterEditorActionListener(new Runnable()->{
* Toast.makeText(context,"Enter Pressed",Toast.LENGTH_SHORT).show();
* }));
* </code>
* @param doOnEnter A Runnable for what to do when the user hits enter
* @return the TextView.OnEditorActionListener
*/
public static TextView.OnEditorActionListener onEnterEditorActionListener(final Runnable doOnEnter){
return (__, actionId, event) -> {
if (event==null) {
if (actionId == EditorInfo.IME_ACTION_DONE) {
// Capture soft enters in a singleLine EditText that is the last EditText.
doOnEnter.run();
return true;
} else if (actionId==EditorInfo.IME_ACTION_NEXT) {
// Capture soft enters in other singleLine EditTexts
doOnEnter.run();
return true;
} else {
return false; // Let system handle all other null KeyEvents
}
} else if (actionId==EditorInfo.IME_NULL) {
// Capture most soft enters in multi-line EditTexts and all hard enters.
// They supply a zero actionId and a valid KeyEvent rather than
// a non-zero actionId and a null event like the previous cases.
if (event.getAction()==KeyEvent.ACTION_DOWN) {
// We capture the event when key is first pressed.
return true;
} else {
doOnEnter.run();
return true; // We consume the event when the key is released.
}
} else {
// We let the system handle it when the listener
// is triggered by something that wasn't an enter.
return false;
}
};
}
完美的工作
public class MainActivity extends AppCompatActivity {
TextView t;
Button b;
EditText e;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b = (Button) findViewById(R.id.b);
e = (EditText) findViewById(R.id.e);
e.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (before == 0 && count == 1 && s.charAt(start) == '\n') {
b.performClick();
e.getText().replace(start, start + 1, ""); //remove the <enter>
}
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
@Override
public void afterTextChanged(Editable s) {}
});
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
b.setText("ok");
}
});
}
}
完美的工作
I had a similar purpose. I wanted to resolve pressing the "Enter" key on the keyboard (which I wanted to customize) in an AutoCompleteTextView which extends TextView. I tried different solutions from above and they seemed to work. BUT I experienced some problems when I switched the input type on my device (Nexus 4 with AOKP ROM) from SwiftKey 3 (where it worked perfectly) to the standard Android keyboard (where instead of handling my code from the listener, a new line was entered after pressing the "Enter" key. It took me a while to handle this problem, but I don't know if it will work under all circumstances no matter which input type you use.
这是我的解决方案:
在xml中设置TextView的输入类型属性为"text":
android:inputType="text"
自定义键盘上“Enter”键的标签:
myTextView.setImeActionLabel("Custom text", KeyEvent.KEYCODE_ENTER);
将OnEditorActionListener设置为TextView:
myTextView.setOnEditorActionListener(new OnEditorActionListener()
{
@Override
public boolean onEditorAction(TextView v, int actionId,
KeyEvent event)
{
boolean handled = false;
if (event.getAction() == KeyEvent.KEYCODE_ENTER)
{
// Handle pressing "Enter" key here
handled = true;
}
return handled;
}
});
我希望这能帮助其他人避免我遇到的问题,因为它们几乎把我逼疯了。
如果使用DataBinding,请参见https://stackoverflow.com/a/52902266/2914140和https://stackoverflow.com/a/67933283/2914140。
Bindings.kt:
@BindingAdapter("onEditorEnterAction")
fun EditText.onEditorEnterAction(callback: OnActionListener?) {
if (callback == null) setOnEditorActionListener(null)
else setOnEditorActionListener { v, actionId, event ->
val imeAction = when (actionId) {
EditorInfo.IME_ACTION_DONE,
EditorInfo.IME_ACTION_SEND,
EditorInfo.IME_ACTION_GO -> true
else -> false
}
val keydownEvent = event?.keyCode == KeyEvent.KEYCODE_ENTER
&& event.action == KeyEvent.ACTION_DOWN
if (imeAction or keydownEvent) {
callback.enterPressed()
return@setOnEditorActionListener true
}
return@setOnEditorActionListener false
}
}
interface OnActionListener {
fun enterPressed()
}
layout.xml:
<data>
<variable
name="viewModel"
type="YourViewModel" />
</data>
<EditText
android:imeOptions="actionDone|actionSend|actionGo"
android:singleLine="true"
android:text="@={viewModel.message}"
app:onEditorEnterAction="@{() -> viewModel.send()}" />
本页详细描述了如何做到这一点。
https://developer.android.com/training/keyboard-input/style.html
设置android:imeOptions,然后检查onEditorAction中的actionId。因此,如果你设置imeOptions为“actionDone”,那么你会检查“actionId == EditorInfo”。onEditorAction中的IME_ACTION_DONE `。另外,确保设置android:inputType。
如果使用材质设计,将代码放在TextInputEditText中。
下面是上面链接的例子中的EditText:
<EditText
android:id="@+id/search"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="@string/search_hint"
android:inputType="text"
android:imeOptions="actionSend" />
您还可以使用setImeOptions(int)函数以编程方式设置此选项。下面是上面链接的例子中的OnEditorActionListener:
EditText editText = (EditText) findViewById(R.id.search);
editText.setOnEditorActionListener(new OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
boolean handled = false;
if (actionId == EditorInfo.IME_ACTION_SEND) {
sendMessage();
handled = true;
}
return handled;
}
});