我有一个包含如下视图的布局:
<LinearLayout>
<TextView...>
<TextView...>
<ImageView ...>
<EditText...>
<Button...>
</linearLayout>
如何以编程方式在我的EditText上设置焦点(显示键盘)?
我已经尝试过了，它只在我正常启动我的活动时才起作用，但当我在TabHost中启动它时，它不起作用。
txtSearch.setFocusableInTouchMode(true);
txtSearch.setFocusable(true);
txtSearch.requestFocus();
当前回答
试试这个:
EditText editText = (EditText) findViewById(R.id.myTextViewId);
editText.requestFocus();
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(editText, InputMethodManager.SHOW_IMPLICIT);
requestFocus (http://developer.android.com/reference/android/view/View.html)
其他回答
我推荐使用一个LifecycleObserver，它是Android Jetpack中使用生命周期感知组件处理生命周期的一部分。
当片段/活动出现时，我想打开和关闭键盘。首先，为EditText定义两个扩展函数。你可以把它们放在项目的任何地方:
fun EditText.showKeyboard() {
requestFocus()
val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
imm.showSoftInput(this, InputMethodManager.SHOW_IMPLICIT)
}
fun EditText.hideKeyboard() {
val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
imm.hideSoftInputFromWindow(this.windowToken, 0)
}
然后定义一个LifecycleObserver，当Activity/Fragment到达onResume()或onPause时打开和关闭键盘:
class EditTextKeyboardLifecycleObserver(private val editText: WeakReference<EditText>) :
LifecycleObserver {
@OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
fun openKeyboard() {
editText.get()?.postDelayed({ editText.get()?.showKeyboard() }, 100)
}
@OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
fun closeKeyboard() {
editText.get()?.hideKeyboard()
}
}
然后将下面的行添加到您的任何片段/活动中，您可以在任何时候重用LifecycleObserver。例如，对于片段:
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
// inflate the Fragment layout
lifecycle.addObserver(EditTextKeyboardLifecycleObserver(WeakReference(myEditText)))
// do other stuff and return the view
}
use:
editText.requestFocus();
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
editTxt.setOnFocusChangeListener { v, hasFocus ->
val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
if (hasFocus) {
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY)
} else {
imm.hideSoftInputFromWindow(v.windowToken, 0)
}
}
我尝试了大卫·梅里曼(David Merriman)的最上面的答案，它也不适合我。但我发现建议运行这段代码延迟在这里，它的工作就像一个魅力。
val editText = view.findViewById<View>(R.id.settings_input_text)
editText.postDelayed({
editText.requestFocus()
val imm = context.getSystemService(INPUT_METHOD_SERVICE) as? InputMethodManager
imm?.showSoftInput(editText, InputMethodManager.SHOW_IMPLICIT)
}, 100)
final EditText tb = new EditText(this);
tb.requestFocus();
tb.postDelayed(new Runnable() {
@Override
public void run() {
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
inputMethodManager.showSoftInput(tb, InputMethodManager.SHOW_IMPLICIT);
}
}, 1000);
