沉浸式状态栏，activity的windowSoftInputMode的属性设置为：adjustResize无效的问题

这个问题google了一下，答案都是一样的。但在使用过程中，发现在有虚拟键的情况下有问题。所以自己做了进一步优化。自己测试通过的机型有红米note5plus、华为p9、魅蓝note2、荣耀V8、华为nova2 plus。

完整代码如下:

import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.WindowManager;
import android.widget.FrameLayout;

import java.lang.reflect.Method;

/*全屏模式下，即使将activity的windowSoftInputMode的属性设置为：adjustResize，
在键盘显示时它未将Activity的Screen向上推动，所以你Activity的view的根树的尺寸是没有变化的。
在这种情况下，你也就无法得知键盘的尺寸，对根view的作相应的推移。全屏下的键盘无法Resize的问题从2.1就已经存在了，直到现在google还未给予解决。*/
public class AndroidBug5497Workaround implements ViewTreeObserver.OnGlobalLayoutListener{

    private Activity activity;

    public static AndroidBug5497Workaround init (Activity activity) {
       return new AndroidBug5497Workaround(activity);
    }

    private  View mChildOfContent;
    private int usableHeightPrevious=0;
    private FrameLayout.LayoutParams frameLayoutParams;

    /*底部导航栏的比率*/
    private static final double NAVIGATION_RATIO = 0.07;

    private AndroidBug5497Workaround(Activity activity) {
        this.activity = activity;
        FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
        mChildOfContent = content.getChildAt(0);
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(this);
        frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
    }

    /**
     * @describe： 销毁
     * @date： 2018/3/12 
     */
    public  void destory(){
        if(mChildOfContent!=null){
            mChildOfContent.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            activity = null;
        }
    }


    /*重新设置高度*/
    private void possiblyResizeChildOfContent(Activity activity) {
        int usableHeightNow = computeUsableHeight(activity);

        if (usableHeightNow != usableHeightPrevious) {
            int screenRealHeight = getScreenRealHeight(activity);

            /*有虚拟键的处理*/
            int bottomNavigationHeight =  screenRealHeight- usableHeightNow;
            if(bottomNavigationHeight>0 && bottomNavigationHeight<=screenRealHeight*NAVIGATION_RATIO){
                screenRealHeight = screenRealHeight-bottomNavigationHeight;
            }

            int heightDifference = screenRealHeight - usableHeightNow;
            if (heightDifference > (screenRealHeight/4)) {//软键盘弹出的情况
                frameLayoutParams.height = screenRealHeight - heightDifference;
            } else {
                // keyboard probably just became hidden
                frameLayoutParams.height = screenRealHeight;
            }
            mChildOfContent.requestLayout();
            usableHeightPrevious = usableHeightNow;
        }
    }

    //获取屏幕原始尺寸高度，包括虚拟功能键高度
    private  int getScreenRealHeight(Context context){
        int dpi = 0;
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = windowManager.getDefaultDisplay();
        DisplayMetrics displayMetrics = new DisplayMetrics();
        @SuppressWarnings("rawtypes")
        Class c;
        try {
            c = Class.forName("android.view.Display");
            @SuppressWarnings("unchecked")
            Method method = c.getMethod("getRealMetrics",DisplayMetrics.class);
            method.invoke(display, displayMetrics);
            dpi=displayMetrics.heightPixels;
        }catch(Exception e){
            e.printStackTrace();
        }
        return dpi;
    }


    private int computeUsableHeight(Activity activity) {
        Rect r = new Rect();
        mChildOfContent.getWindowVisibleDisplayFrame(r);
        return (r.bottom - r.top)+DensityUtil.getStatusHeight(activity);
    }

    @Override
    public void onGlobalLayout() {
        possiblyResizeChildOfContent(activity);
    }
}

在Activity中使用:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_confirm_order);

        ButterKnife.bind(this);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            //沉浸式状态栏
            immersionBar = ImmersionBar.with(this).statusBarDarkFont(true, 0.2f);
            immersionBar.init();

            bug5497Workaround = AndroidBug5497Workaround.init(this);
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (immersionBar != null) {
            immersionBar.destroy();
        }
        if (presenter != null) {
            presenter.destory();
        }
        if(bug5497Workaround!=null){
            bug5497Workaround.destory();
        }
    }

本人水平有限,有什么不对的地方，欢迎指正。