工具類

public class SoftKeyboardStateHelper implements ViewTreeObserver.OnGlobalLayoutListener {
	
    public interface SoftKeyboardStateListener {
        void onSoftKeyboardOpened(int keyboardHeightInPx);
        void onSoftKeyboardClosed();
    }
    
    private static final int KEYBOARD_HEIGHT =
 
 DensityUtil.dip2px(context, 100);
    private final List<SoftKeyboardStateListener> listeners = new LinkedList<>();
    private final View activityRootView;
    private int lastSoftKeyboardHeightInPx;
    private boolean isSoftKeyboardOpened;
    public SoftKeyboardStateHelper(View activityRootView)
 
 {
        this(activityRootView, false);
    }
    public SoftKeyboardStateHelper(View activityRootView, boolean isSoftKeyboardOpened) {
        this.activityRootView = activityRootView;
        this.isSoftKeyboardOpened = isSoftKeyboardOpened;
        activityRootView.getViewTreeObserver().addOnGlobalLayoutListener
 
(this);
    }
    @Override
    public void onGlobalLayout() {
        final Rect r = new Rect();
        activityRootView.getWindowVisibleDisplayFrame(r);
        final int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
        if (!isSoftKeyboardOpened
                && heightDiff
                        > KEYBOARD_HEIGHT) { // if more than 100 pixels, its probably a keyboard...
            isSoftKeyboardOpened = true;
            notifyOnSoftKeyboardOpened(heightDiff);
        } else if (isSoftKeyboardOpened && heightDiff < KEYBOARD_HEIGHT) {
            isSoftKeyboardOpened = false;
            notifyOnSoftKeyboardClosed();
        }
    }
    public void setIsSoftKeyboardOpened(boolean isSoftKeyboardOpened) {
        this.isSoftKeyboardOpened = isSoftKeyboardOpened;
    }
    public boolean isSoftKeyboardOpened() {
        return isSoftKeyboardOpened;
    }
    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：

	SoftKeyboardStateHelper softKeyboardStateHelper =
			new SoftKeyboardStateHelper(findViewById(R.id.content_wrapper));      //最外層的layout
	        softKeyboardStateHelper.addSoftKeyboardStateListener(
                new SoftKeyboardStateHelper.SoftKeyboardStateListener() {
                    @Override
                    public void onSoftKeyboardOpened(int keyboardHeightInPx) {
                    }
                    @Override
                    public void onSoftKeyboardClosed() {
                    }
                });
    }

windowSoftInputMode = adjustNothing 時該控制元件不會生效
windowSoftInputMode = adjustPan 保證獲得焦點的控制元件不被遮擋，另如果鍵盤彈出前編輯框在位置A ,點選編輯框時彈出鍵盤，且編輯框由動畫上移至位置B，整個佈局還是會向上推移保證位置A不被遮擋。

另華為安手機的安全鍵盤：在使用者名稱和密碼輸入框之間相互切換時會自動切換輸入法，導致開啟鍵盤和關閉鍵盤在不當的時機多次呼叫；