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
隐藏|显示事件键盘可以通过简单的hack在OnGlobalLayoutListener监听:
final View activityRootView = findViewById(R.id.top_root);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
public void onGlobalLayout() {
int heightDiff = activityRootView.getRootView().getHeight() - activityRootView.getHeight();
if (heightDiff > 100) {
// keyboard is up
} else {
// keyboard is down
}
}
});
这里activityRootView是Activity的根视图。
其他回答
如果你想从你的活动中处理IMM(虚拟)键盘窗口的显示/隐藏,你需要子类化你的布局并覆盖onMesure方法(这样你就可以确定你的布局的测量宽度和测量高度)。之后,通过setContentView()将子类布局设置为Activity的主视图。现在您将能够处理IMM显示/隐藏窗口事件。也许这听起来很复杂,但事实并非如此。代码如下:
main。xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<EditText
android:id="@+id/SearchText"
android:text=""
android:inputType="text"
android:layout_width="fill_parent"
android:layout_height="34dip"
android:singleLine="True"
/>
<Button
android:id="@+id/Search"
android:layout_width="60dip"
android:layout_height="34dip"
android:gravity = "center"
/>
</LinearLayout>
现在在布局的Activity声明子类中(main.xml)
public class MainSearchLayout extends LinearLayout {
public MainSearchLayout(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 onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
Log.d("Search Layout", "Handling Keyboard Window shown");
final int proposedheight = MeasureSpec.getSize(heightMeasureSpec);
final int actualHeight = getHeight();
if (actualHeight > proposedheight){
// Keyboard is shown
} else {
// Keyboard is hidden
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
您可以从代码中看到,我们在子类构造函数中为Activity扩展布局
inflater.inflate(R.layout.main, this);
现在只需设置Activity的子类布局的内容视图。
public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MainSearchLayout searchLayout = new MainSearchLayout(this, null);
setContentView(searchLayout);
}
// rest of the Activity code and subclassed layout...
}
就像@amalBit的答案一样,注册一个全局布局的监听器,并计算dectorView的可见底部和建议底部的差值,如果差值大于某个值(猜测IME的高度),我们认为IME是up的:
final EditText edit = (EditText) findViewById(R.id.edittext);
edit.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (keyboardShown(edit.getRootView())) {
Log.d("keyboard", "keyboard UP");
} else {
Log.d("keyboard", "keyboard Down");
}
}
});
private boolean keyboardShown(View rootView) {
final int softKeyboardHeight = 100;
Rect r = new Rect();
rootView.getWindowVisibleDisplayFrame(r);
DisplayMetrics dm = rootView.getResources().getDisplayMetrics();
int heightDiff = rootView.getBottom() - r.bottom;
return heightDiff > softKeyboardHeight * dm.density;
}
高度阈值100是IME猜测的最小高度。
这适用于adjustPan和adjuststresize。
这可能不是最有效的解决方案。但这对我每次都有效……我调用这个函数每当我需要听软键盘。
boolean isOpened = false;
public void setListenerToRootView() {
final View activityRootView = getWindow().getDecorView().findViewById(android.R.id.content);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
int heightDiff = activityRootView.getRootView().getHeight() - activityRootView.getHeight();
if (heightDiff > 100) { // 99% of the time the height diff will be due to a keyboard.
Toast.makeText(getApplicationContext(), "Gotcha!!! softKeyboardup", 0).show();
if (isOpened == false) {
//Do two things, make the view top visible and the editText smaller
}
isOpened = true;
} else if (isOpened == true) {
Toast.makeText(getApplicationContext(), "softkeyborad Down!!!", 0).show();
isOpened = false;
}
}
});
}
注意: 如果用户使用浮动键盘,这种方法将导致问题。
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。
android 11之前的解决方案:
androidx。Core 1.5.0发布了,这是我在android 11之前的设备上监听键盘显示/隐藏事件的方法。
gradle:
implementation "androidx.core:core-ktx:1.5.0"
片段:
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val view = activity?.window?.decorView ?: return
ViewCompat.setOnApplyWindowInsetsListener(view) { v, insets ->
val showingKeyboard = insets.isVisible(WindowInsetsCompat.Type.ime())
if(showingKeyboard){
//do something
}
insets
}
}
确保在视图销毁时删除侦听器,以避免内存泄漏。这个解决方案也只适用于软件输入模式为adjuststresize时,如果它是adjustPan, setOnApplyWindowInsetsListener将不会触发,如果任何人有关于如何使它与adjustPan一起工作的想法,请分享。
注意,根据医生的说法
* When running on devices with API Level 29 and before, the returned value is an
* approximation based on the information available. This is especially true for the {@link
* Type#ime IME} type, which currently only works when running on devices with SDK level 23
* and above.
*
insets.isVisible(ime)应该只在SDK级别高于23的设备上工作