封装一个类：软键盘弹出，将控件整体顶上去

来源：互联网发布：suse linux 扩磁盘编辑：程序博客网时间：2024/05/29 14:27

软键盘弹起后将整个内容框顶起：

封装一个类“CustomGlobalLayoutListener”

import android.content.Context;import android.graphics.Rect;import android.view.View;import android.view.ViewTreeObserver.OnGlobalLayoutListener;/** * 实现弹出软键盘时 整个布局向上平移,解决遮挡问题 * 在onCreate中添加监听,在onDestroy中remove监听 * Created by KingsleyCheng on 2017/4/1. */public class CustomGlobalLayoutListener implements OnGlobalLayoutListener {    private Context mContext;    private View mRootView;    private View mScrollToView;    private int btnY;    /**     * @param context      context     * @param rootView     可以滚动的布局     * @param scrollToView 界面上被遮挡的位于最底部的布局(控件)     */    public CustomGlobalLayoutListener(Context context, View rootView, View scrollToView) {        this.mContext = context;        this.mRootView = rootView;        this.mScrollToView = scrollToView;    }    @Override    public void onGlobalLayout() {        Rect rect = new Rect();        // 获取root在窗体的可视区域        mRootView.getWindowVisibleDisplayFrame(rect);        int rootViewHeight = mRootView.getRootView().getHeight();        // 当前视图最外层的高度减去现在所看到的视图的最底部的y坐标        int rootInvisibleHeight = rootViewHeight - rect.bottom;        //软键盘高度        int heightDifference = rootViewHeight - (rect.bottom - rect.top);        // 若rootInvisibleHeight高度大于100，则说明当前视图上移了，说明软键盘弹出了        if (rootInvisibleHeight > 100) {            //软键盘弹出来的时候            int[] location = new int[2];            // 获取scrollToView在窗体的坐标            mScrollToView.getLocationInWindow(location);            //btnY的初始值为0，一旦赋过一次值就不再变化            if (btnY == 0) {                btnY = location[1];            }            int scrollToViewHeight = mScrollToView.getHeight();            // 计算root滚动高度，使scrollToView在可见区域的底部            int scrollHeight = (btnY + scrollToViewHeight) - rect.bottom;            //如果控件所在的当前高度大于软键盘的高度，控件就不上移            if ((rootViewHeight - location[1] - scrollToViewHeight) <        heightDifference) {                mRootView.scrollTo(0, scrollHeight);            }        } else {            // 软键盘没有弹出来的时候            mRootView.scrollTo(0, 0);        }    }}

使用方法：

private CustomGlobalLayoutListener customGlobalLayoutListener;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    requestWindowFeature(Window.FEATURE_NO_TITLE);    setContentView(R.layout.activity_create_task);    customGlobalLayoutListener = new CustomGlobalLayoutListener(this, scrollView, mBtnNextStep);    scrollView.getViewTreeObserver().addOnGlobalLayoutListener   (customGlobalLayoutListener);最后在 onDestroy()生命周期里面取消注册，防止内存溢出if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {  
scrollView.getViewTreeObserver().removeOnGlobalLayoutListener(customGlobalLayoutListener);  
} else {  
scrollView.getViewTreeObserver().removeGlobalOnLayoutListener(customGlobalLayoutListener);  
}

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