android实战项目之彻底解决RichEditor的软键盘弹出问题

效果图

起因与方案

andriod项目开发需求，需要用到富文本编辑器，经过对比用到RichEditor编辑器，不过里面好多的坑，会遇到这样或那样的问题。编辑器内容过多时候，会被弹出的软键盘覆盖，经过几天的努力终于解决这个问题。

1.  引入第三方库

implementation 'jp.wasabeef:richeditor-android:2.0.0'

2. 键盘处理工具类

public class SoftHideKeyBoardUtil {
    private final String TAG="SoftHideKeyBoardUtil";
    public static void assistActivity(Activity activity) {
        new SoftHideKeyBoardUtil(activity);
    }

    private View mChildOfContent;
    private int usableHeightPrevious;
    private FrameLayout.LayoutParams frameLayoutParams;
    //为适应华为小米等手机键盘上方出现黑条或不适配
    private int contentHeight;//获取setContentView本来view的高度
    private boolean isfirst = true;//只用获取一次
    private int statusBarHeight;//状态栏高度
    private Activity mActivity;

    private SoftHideKeyBoardUtil(Activity activity) {

        mActivity = activity;
        //1､找到Activity的最外层布局控件，它其实是一个DecorView,它所用的控件就是FrameLayout
        FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
        //2､获取到setContentView放进去的View
        mChildOfContent = content.getChildAt(0);
        //3､给Activity的xml布局设置View树监听，当布局有变化，如键盘弹出或收起时，都会回调此监听
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            //4､软键盘弹起会使GlobalLayout发生变化
            public void onGlobalLayout() {
                //Log.i(TAG,"键盘弹起动作");
                if (isfirst) {
                    contentHeight = mChildOfContent.getHeight();//兼容华为等机型
                    isfirst = false;
                }
                contentHeight = mChildOfContent.getHeight();//兼容华为等机型

                //5､当前布局发生变化时，对Activity的xml布局进行重绘
                possiblyResizeChildOfContent();
            }
        });
        //6､获取到Activity的xml布局的放置参数
        frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
    }

    private void possiblyResizeChildOfContent() {
        //1､获取当前界面可用高度，键盘弹起后，当前界面可用布局会减少键盘的高度
        int usableHeightNow = computeUsableHeight();
       
        //2､如果当前可用高度和原始值不一样
        if (usableHeightNow != usableHeightPrevious) {
            //3､获取Activity中xml中布局在当前界面显示的高度
            int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
            //4､Activity中xml布局的高度-当前可用高度
            int heightDifference = usableHeightSansKeyboard - usableHeightNow;
            //5､高度差大于屏幕1/4时，说明键盘弹出
            if (heightDifference > (usableHeightSansKeyboard / 4)) {
                Log.d(TAG,"弹出");
                // 6､键盘弹出了，Activity的xml布局高度应当减去键盘高度
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                    frameLayoutParams.height = usableHeightSansKeyboard - heightDifference + statusBarHeight+bottomNavigationHeight*2;
                } else {
                    frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
                }
            }
            //7､ 重绘Activity的xml布局
            mChildOfContent.requestLayout();
            usableHeightPrevious = usableHeightNow;
        }
    }
   
}

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