监听键盘弹出事件

工具类

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));      //最外层的layout
	        softKeyboardStateHelper.addSoftKeyboardStateListener(
                new SoftKeyboardStateHelper.SoftKeyboardStateListener() {
                    @Override
                    public void onSoftKeyboardOpened(int keyboardHeightInPx) {
                    }
                    @Override
                    public void onSoftKeyboardClosed() {
                    }
                });
    }

windowSoftInputMode = adjustNothing 时该控件不会生效
windowSoftInputMode = adjustPan 保证获得焦点的控件不被遮挡，另如果键盘弹出前编辑框在位置A ,点击编辑框时弹出键盘，且编辑框由动画上移至位置B，整个布局还是会向上推移保证位置A不被遮挡。

另华为安手机的安全键盘：在用户名和密码输入框之间相互切换时会自动切换输入法，导致打开键盘和关闭键盘在不当的时机多次调用；