我需要做一件非常简单的事情-找出软件键盘是否显示。这在Android中可行吗?
当前回答
抱歉回答晚了,但我已经创建了一个小的帮助类来处理打开/关闭事件,通知侦听器和其他有用的东西,可能有人会发现它有帮助:
import android.graphics.Rect;
import android.view.View;
import android.view.ViewTreeObserver;
import java.util.LinkedList;
import java.util.List;
public class SoftKeyboardStateWatcher implements ViewTreeObserver.OnGlobalLayoutListener {
public interface SoftKeyboardStateListener {
void onSoftKeyboardOpened(int keyboardHeightInPx);
void onSoftKeyboardClosed();
}
private final List<SoftKeyboardStateListener> listeners = new LinkedList<SoftKeyboardStateListener>();
private final View activityRootView;
private int lastSoftKeyboardHeightInPx;
private boolean isSoftKeyboardOpened;
public SoftKeyboardStateWatcher(View activityRootView) {
this(activityRootView, false);
}
public SoftKeyboardStateWatcher(View activityRootView, boolean isSoftKeyboardOpened) {
this.activityRootView = activityRootView;
this.isSoftKeyboardOpened = isSoftKeyboardOpened;
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(this);
}
@Override
public void onGlobalLayout() {
final Rect r = new Rect();
//r will be populated with the coordinates of your view that area still visible.
activityRootView.getWindowVisibleDisplayFrame(r);
final int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
if (!isSoftKeyboardOpened && heightDiff > 100) { // if more than 100 pixels, its probably a keyboard...
isSoftKeyboardOpened = true;
notifyOnSoftKeyboardOpened(heightDiff);
} else if (isSoftKeyboardOpened && heightDiff < 100) {
isSoftKeyboardOpened = false;
notifyOnSoftKeyboardClosed();
}
}
public void setIsSoftKeyboardOpened(boolean isSoftKeyboardOpened) {
this.isSoftKeyboardOpened = isSoftKeyboardOpened;
}
public boolean isSoftKeyboardOpened() {
return isSoftKeyboardOpened;
}
/**
* Default value is zero {@code 0}.
*
* @return last saved keyboard height in px
*/
public int getLastSoftKeyboardHeightInPx() {
return lastSoftKeyboardHeightInPx;
}
public void addSoftKeyboardStateListener(SoftKeyboardStateListener listener) {
listeners.add(listener);
}
public void removeSoftKeyboardStateListener(SoftKeyboardStateListener listener) {
listeners.remove(listener);
}
private void notifyOnSoftKeyboardOpened(int keyboardHeightInPx) {
this.lastSoftKeyboardHeightInPx = keyboardHeightInPx;
for (SoftKeyboardStateListener listener : listeners) {
if (listener != null) {
listener.onSoftKeyboardOpened(keyboardHeightInPx);
}
}
}
private void notifyOnSoftKeyboardClosed() {
for (SoftKeyboardStateListener listener : listeners) {
if (listener != null) {
listener.onSoftKeyboardClosed();
}
}
}
}
使用的例子:
final SoftKeyboardStateWatcher softKeyboardStateWatcher
= new SoftKeyboardStateWatcher(findViewById(R.id.activity_main_layout);
// Add listener
softKeyboardStateWatcher.addSoftKeyboardStateListener(...);
// then just handle callbacks
其他回答
希望这能帮助到大家。
Reuben Scratton给出的新答案非常棒,而且非常有效,但它只在你将windowSoftInputMode设置为adjuststresize时才有效。如果你将它设置为adjustPan,使用他的代码片段仍然无法检测键盘是否可见。为了解决这个问题,我对上面的代码做了微小的修改。
final View activityRootView = findViewById(R.id.activityRoot);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
Rect r = new Rect();
//r will be populated with the coordinates of your view that area still visible.
activityRootView.getWindowVisibleDisplayFrame(r);
int heightDiff = activityRootView.getRootView().getHeight() - r.height();
if (heightDiff > 0.25*activityRootView.getRootView().getHeight()) { // if more than 25% of the screen, its probably a keyboard...
... do something here
}
}
});
当在viewpager中改变片段的方向时,我很难保持键盘状态。我不知道为什么,但它似乎是不稳定的,行为不同于标准的活动。
在这种情况下,要保持键盘状态,首先你应该添加android:windowSoftInputMode = "stateUnchanged"到你的AndroidManifest.xml。不过,您可能会注意到,这实际上并没有解决整个问题——如果在方向改变之前打开了键盘,那么键盘就不会为我打开。在其他所有情况下,这种行为似乎都是正确的。
然后,我们需要实现这里提到的解决方案之一。 我发现的最干净的一个是George Maisuradze的——使用hideSoftInputFromWindow中的布尔回调:
InputMethodManager imm = (InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE);
return imm.hideSoftInputFromWindow(mViewPager.getWindowToken(), 0);
我将这个值存储在我的Fragment的onSaveInstanceState方法中,并在onCreate中检索它。然后,我强制显示键盘在onCreateView,如果它有一个值为真(它返回真,如果键盘是可见的,实际上隐藏它之前的片段销毁)。
我认为这个方法将帮助你找出是键盘是可见的或不。
public Boolean isSoftKeyBoardVisible(){
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm.isAcceptingText()) {
Log.d(TAG,"Software Keyboard was shown");
return true;
} else {
Log.d(TAG,"Software Keyboard was not shown");
return false;
}
}
就计算机而言,这是永远的问题,但这个问题仍然令人难以置信地相关!
所以我把上面的答案结合起来,做了一些改进……
public interface OnKeyboardVisibilityListener {
void onVisibilityChanged(boolean visible);
}
public final void setKeyboardListener(final OnKeyboardVisibilityListener listener) {
final View activityRootView = ((ViewGroup) getActivity().findViewById(android.R.id.content)).getChildAt(0);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
private boolean wasOpened;
private final int DefaultKeyboardDP = 100;
// From @nathanielwolf answer... Lollipop includes button bar in the root. Add height of button bar (48dp) to maxDiff
private final int EstimatedKeyboardDP = DefaultKeyboardDP + (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? 48 : 0);
private final Rect r = new Rect();
@Override
public void onGlobalLayout() {
// Convert the dp to pixels.
int estimatedKeyboardHeight = (int) TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP, EstimatedKeyboardDP, activityRootView.getResources().getDisplayMetrics());
// Conclude whether the keyboard is shown or not.
activityRootView.getWindowVisibleDisplayFrame(r);
int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
boolean isShown = heightDiff >= estimatedKeyboardHeight;
if (isShown == wasOpened) {
Log.d("Keyboard state", "Ignoring global layout change...");
return;
}
wasOpened = isShown;
listener.onVisibilityChanged(isShown);
}
});
}
对我有用:)
注意: 如果你注意到DefaultKeyboardDP不适合你的设备播放的值,并发表评论,让每个人都知道应该是什么值…最终我们将得到适合所有设备的正确值!
要了解更多细节,请查看Cyborg上的实现
你可以使用InputMethodManager。isActive方法,如果键盘可见则返回true:
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.isActive();
你也可以看到键盘在一个特定的视图中是否处于活动状态:
imm.isActive(View v);
推荐文章
- 警告:API ' variable . getjavacompile()'已过时,已被' variable . getjavacompileprovider()'取代
- 安装APK时出现错误
- 碎片中的onCreateOptionsMenu
- TextView粗体通过XML文件?
- 如何使线性布局的孩子之间的空间?
- DSL元素android.dataBinding。enabled'已过时,已被'android.buildFeatures.dataBinding'取代
- ConstraintLayout:以编程方式更改约束
- PANIC: AVD系统路径损坏。检查ANDROID_SDK_ROOT值
- 如何生成字符串类型的buildConfigField
- Recyclerview不调用onCreateViewHolder
- Android API 21工具栏填充
- Android L中不支持操作栏导航模式
- 如何在TextView中添加一个子弹符号?
- PreferenceManager getDefaultSharedPreferences在Android Q中已弃用
- 在Android Studio中创建aar文件