Android 键盘弹出监听

之前一直是使用AndroidUtilCode 的 KeyboardUtil,直到遇到问题

补充一种监听

package com.as.apprehendschool.customviews;

import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.inputmethod.InputMethodManager;

public class SoftKeyBoardListener {
    private View rootView;//activity的根视图
    int rootViewVisibleHeight;//纪录根视图的显示高度
    private OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener;
 
    public SoftKeyBoardListener(Activity activity) {
        //获取activity的根视图
        rootView = activity.getWindow().getDecorView();
 
        //监听视图树中全局布局发生改变或者视图树中的某个视图的可视状态发生改变
        rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                //获取当前根视图在屏幕上显示的大小
                Rect rect = new Rect();
                rootView.getWindowVisibleDisplayFrame(rect);
                //当前activity根视图的高度
                int visibleHeight = rect.height();

                if (rootViewVisibleHeight == 0) {
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }
 
                //根视图显示高度没有变化，可以看作软键盘显示／隐藏状态没有改变
                if (rootViewVisibleHeight == visibleHeight) {
                    return;
                }
 
                //根视图显示高度变小超过200，可以看作软键盘显示了
                if (rootViewVisibleHeight - visibleHeight > 200) {
                    if (onSoftKeyBoardChangeListener != null) {
                        onSoftKeyBoardChangeListener.keyBoardShow(rootViewVisibleHeight - visibleHeight);
                    }
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }
 
                //根视图显示高度变大超过200，可以看作软键盘隐藏了
                if (visibleHeight - rootViewVisibleHeight > 200) {
                    if (onSoftKeyBoardChangeListener != null) {
                        onSoftKeyBoardChangeListener.keyBoardHide(visibleHeight - rootViewVisibleHeight);
                    }
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }
 
            }
        });
    }
 
    private void setOnSoftKeyBoardChangeListener(OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
        this.onSoftKeyBoardChangeListener = onSoftKeyBoardChangeListener;
    }
 
    public interface OnSoftKeyBoardChangeListener {
        void keyBoardShow(int height);
 
        void keyBoardHide(int height);
    }
 
    //使用方法：直接调用此方法即可
    public static void setListener(Activity activity, OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
        SoftKeyBoardListener softKeyBoardListener = new SoftKeyBoardListener(activity);
        softKeyBoardListener.setOnSoftKeyBoardChangeListener(onSoftKeyBoardChangeListener);
    }
 
    /**显示软键盘*/
    public static void showKeyBoard(Activity activity, View view){
        //打开软键盘
        InputMethodManager imm = (InputMethodManager)activity.getSystemService(Context.INPUT_METHOD_SERVICE);
        if (imm != null) {
            imm.showSoftInput(view, 0);
        }
    }
 
    /**隐藏软键盘*/
    public static void hideKeyBoard(Activity activity, View view){
        InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
        if (imm != null) {
            imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
        }
 
    }
 
}

 SoftKeyBoardListener.setListener(mActivity, new SoftKeyBoardListener.OnSoftKeyBoardChangeListener() {
                @Override
                public void keyBoardShow(int height) {

                    //第一次的show 可以捕捉到 就是布局没改变,第二次键盘弹出就可以了
                    RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) bind.bot.getLayoutParams();
                    layoutParams.bottomMargin = height;
                    bind.bot.setLayoutParams(layoutParams);

                }

                @Override
                public void keyBoardHide(int height) {

                    RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) bind.bot.getLayoutParams();
                    layoutParams.bottomMargin = 0;
                    bind.bot.setLayoutParams(layoutParams);
                }
            });