我想根据是否显示虚拟键盘来改变布局。我已经搜索了API和各种博客,但似乎找不到任何有用的东西。
这可能吗?
谢谢!
我想根据是否显示虚拟键盘来改变布局。我已经搜索了API和各种博客,但似乎找不到任何有用的东西。
这可能吗?
谢谢!
当前回答
桑德,我相信你是想展示被软键盘挡住的视野。试试这个http://android-developers.blogspot.com/2009/04/updating-applications-for-on-screen.html。
其他回答
我是这样做的:
添加OnKeyboardVisibilityListener接口。
public interface OnKeyboardVisibilityListener {
void onVisibilityChanged(boolean visible);
}
HomeActivity.java:
public class HomeActivity extends Activity implements OnKeyboardVisibilityListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sign_up);
// Other stuff...
setKeyboardVisibilityListener(this);
}
private void setKeyboardVisibilityListener(final OnKeyboardVisibilityListener onKeyboardVisibilityListener) {
final View parentView = ((ViewGroup) findViewById(android.R.id.content)).getChildAt(0);
parentView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
private boolean alreadyOpen;
private final int defaultKeyboardHeightDP = 100;
private final int EstimatedKeyboardDP = defaultKeyboardHeightDP + (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? 48 : 0);
private final Rect rect = new Rect();
@Override
public void onGlobalLayout() {
int estimatedKeyboardHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, EstimatedKeyboardDP, parentView.getResources().getDisplayMetrics());
parentView.getWindowVisibleDisplayFrame(rect);
int heightDiff = parentView.getRootView().getHeight() - (rect.bottom - rect.top);
boolean isShown = heightDiff >= estimatedKeyboardHeight;
if (isShown == alreadyOpen) {
Log.i("Keyboard state", "Ignoring global layout change...");
return;
}
alreadyOpen = isShown;
onKeyboardVisibilityListener.onVisibilityChanged(isShown);
}
});
}
@Override
public void onVisibilityChanged(boolean visible) {
Toast.makeText(HomeActivity.this, visible ? "Keyboard is active" : "Keyboard is Inactive", Toast.LENGTH_SHORT).show();
}
}
希望这对你有所帮助。
使用viewTreeObserver轻松获取键盘事件。
layout_parent.viewTreeObserver.addOnGlobalLayoutListener {
val r = Rect()
layout_parent.getWindowVisibleDisplayFrame(r)
if (layout_parent.rootView.height - (r.bottom - r.top) > 100) { // if more than 100 pixels, its probably a keyboard...
Log.e("TAG:", "keyboard open")
} else {
Log.e("TAG:", "keyboard close")
}
}
** layout_parent是你的视图,比如edit_text.parent
Nebojsa的解决方案几乎对我有效。当我在一个多行EditText中单击时,它知道键盘被显示出来,但是当我开始在EditText中输入时,actualHeight和proposedHeight仍然是相同的,所以它不知道键盘仍然被显示出来。我做了一个轻微的修改,以存储最大高度,它工作得很好。下面是修改后的子类:
public class CheckinLayout extends RelativeLayout {
private int largestHeight;
public CheckinLayout(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.checkin, this);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int proposedheight = MeasureSpec.getSize(heightMeasureSpec);
largestHeight = Math.max(largestHeight, getHeight());
if (largestHeight > proposedheight)
// Keyboard is shown
else
// Keyboard is hidden
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
尽管本页上投票最多的解决方案说,有一个setWindowInsetsAnimationCallback的ViewCompat版本一直工作到Android 21。
所以现在,这个解决方案的方法一直适用于21。
来源:https://developer.android.com/reference/androidx/core/view/ViewCompat setWindowInsetsAnimationCallback (android.view.View androidx.core.view.WindowInsetsAnimationCompat.Callback)
Nebojsa Tomcic的回答对我没有帮助。我有RelativeLayout与TextView和AutoCompleteTextView里面。我需要滚动TextView到底部时,键盘显示,当它被隐藏。为了实现这一点,我重写了onLayout方法,它对我来说很好。
public class ExtendedLayout extends RelativeLayout
{
public ExtendedLayout(Context context, AttributeSet attributeSet)
{
super(context, attributeSet);
LayoutInflater inflater = (LayoutInflater)
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.main, this);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
super.onLayout(changed, l, t, r, b);
if (changed)
{
int scrollEnd = (textView.getLineCount() - textView.getHeight() /
textView.getLineHeight()) * textView.getLineHeight();
textView.scrollTo(0, scrollEnd);
}
}
}