技術標籤：Android UIandroid

先貼程式碼

import android.app.Activity;
import android.graphics.Rect;
import android.os.Build;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.FrameLayout;

public class WebWorkaround {

    private static int height;
    private View mChildOfContent;
 

    private int usableHeightPrevious;
    private FrameLayout.LayoutParams frameLayoutParams;
    private int contentHeight;
    private boolean isFirst = true;
    private Activity activity;
    private int statusBarHeight;

    public static void assistActivity(Activity activity, int mHeight) {
        /**
         * 這個傳進來的mheight是tablayout控制元件的高度,如果因為tablayout被鍵盤彈起來,
         * 可以傳入這個值對其進行操作
         */
 

        height = mHeight;
        new WebWorkaround(activity);
    }

    private WebWorkaround(Activity activity) {
        //獲取狀態列的高度
        int resourceId = activity.getResources().getIdentifier(
                "status_bar_height"
                , "dimen", "android"
 
);
        statusBarHeight = activity.getResources().getDimensionPixelSize(resourceId);
        this.activity = activity;
        FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
        mChildOfContent = content.getChildAt(0);
//        mChildOfContent = activity;

        //介面出現變動都會呼叫這個監聽事件
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(
                new ViewTreeObserver.OnGlobalLayoutListener() {
                    public void onGlobalLayout() {
                        if (isFirst) {
                            contentHeight = mChildOfContent.getHeight();
                            isFirst = false;
                        }
                        possiblyResizeChildOfContent();
                    }
                });

        frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
    }

    //重新調整跟佈局的高度
    private void possiblyResizeChildOfContent() {

        int usableHeightNow = computeUsableHeight();
        //當前可見高度和上一次可見高度不一致 佈局變動
        if (usableHeightNow != usableHeightPrevious) {
            //int usableHeightSansKeyboard2 = mChildOfContent.getHeight();
            int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
            int heightDifference = usableHeightSansKeyboard - usableHeightNow;
            if (heightDifference > (usableHeightSansKeyboard / 4)) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                    /**
                     * 以下程式碼便是對可見高度進行賦值
                     */
                    frameLayoutParams.height = usableHeightSansKeyboard
                            - heightDifference + statusBarHeight + height;
//                    frameLayoutParams.height = usableHeightSansKeyboard - heightDifference + statusBarHeight;
                } else {
                    frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
                }
            } else {
                frameLayoutParams.height = contentHeight;
            }
            mChildOfContent.requestLayout();
            usableHeightPrevious = usableHeightNow;
        }
    }

    /**
     * 計算mChildOfContent可見高度     ** @return
     */
    private int computeUsableHeight() {
        Rect r = new Rect();
        mChildOfContent.getWindowVisibleDisplayFrame(r);
        return (r.bottom - r.top);
    }

}

呼叫
在有WebView的活動的onCreate()方法呼叫

WebWorkaround.assistActivity(this,height);

height 的獲取
這裡的高度可以是某個控制元件的高度,比如如果tablayout(底部選單欄).測量tablayout的程式碼如下

int w = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);
int h = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);
tabLayout.measure(w,h);
int height = tabLayout.getMeasuredHeight();
int wight = tabLayout.getMeasuredWidth();
LogUtils.e("h:"+height+"w:"+wight);