判断状态栏是否显示以及获取状态栏高度的方法，及工具类列子

https://www.2cto.com/kf/201703/605854.html

如上述网址所述，有两种通用的方法。第二中方法其实没有必要新建一个服务。

其实可以直接这样用：

优化方案一：

1、onCreate的时候：

    private void initStatusBarHelperView() {
        WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
        mStatusBarHelperView = new View(mContext);
        WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
        lp.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
        lp.gravity = Gravity.LEFT | Gravity.TOP;
        lp.type = WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;
        lp.format = PixelFormat.TRANSLUCENT;
        wm.addView(mStatusBarHelperView, lp);
    }

2、onDestory的时候：

    public void removeStatusBarHelperView() {
        WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
        wm.removeView(mStatusBarHelperView);
        mStatusBarHelperView = null;
    }

3、需要高度的时候：

    public int getStatusBarHeight() {
        int[] windowParams = new int[2];
        int[] screenParams = new int[2];
        mStatusBarHelperView.getLocationInWindow(windowParams);
        mStatusBarHelperView.getLocationOnScreen(screenParams);
        return screenParams[1] - windowParams[1];
    }　　

　上面的方法亲测已经满足。　

优化方案二：

考虑到如果在服务中，只在destory才remove，新建的view一直存在也不太好。所以在onstart和onpusue调用对应的方法比较合适，但是如果频繁的调用又有性能问题，故最终采用在remove的时候延迟执行。最后写了一个工具类，直接调用如下三个方法即可：

StatusBarHelper.getInstance().getStatusBarHeight()

StatusBarHelper.getInstance().addStatusBarHelperView();

StatusBarHelper.getInstance().removeStatusBarHelperView();

工具类如下：

package com.smartisanos.ime.util;

import android.content.Context;
import android.graphics.PixelFormat;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.View;
import android.view.WindowManager;

import com.smartisanos.ime.IMEApp;

public class StatusBarHelper {
    private Context mContext;
    private View mStatusBarHelperView;
    private static StatusBarHelper mStatusBarHelper = new StatusBarHelper();
    private static final int MSG_INIT_STATUS_BAR = 1;
    private static final int MSG_REMOVE_STATUS_BAR = 2;
    private static final long MSG_REMOVE_DELAY_TIME = 500L;

    private Handler mStatusBarHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MSG_INIT_STATUS_BAR:
                    mStatusBarHandler.removeMessages(MSG_REMOVE_STATUS_BAR);
                    initStatusBarHelperView();
                    break;
                case MSG_REMOVE_STATUS_BAR:
                    WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
                    wm.removeView(mStatusBarHelperView);
                    mStatusBarHelperView = null;
                    break;
            }
        }
    };

    private StatusBarHelper() {
        mContext = IMEApp.getContext();
    }

    public static StatusBarHelper getInstance() {
        return mStatusBarHelper;
    }

/*    //由于在本类的构造方法中并没有耗时操作，所以不需要在getInstance()中进行new操作，可以直接在定义变量时直接new。故没有用下面的方法
    public static StatusBarHelper getInstance() {
        if (mStatusBarHelper == null) {
            mStatusBarHelper = new StatusBarHelper();
        }
        return mStatusBarHelper;
    }
    */
    private void initStatusBarHelperView() {
        if (mStatusBarHelperView != null) {
            return;
        }
        WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
        mStatusBarHelperView = new View(mContext);
        WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
        lp.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
        lp.gravity = Gravity.LEFT | Gravity.TOP;
        lp.type = WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;
        lp.format = PixelFormat.TRANSLUCENT;
        wm.addView(mStatusBarHelperView, lp);
    }

    public void addStatusBarHelperView() {
        Message message = mStatusBarHandler.obtainMessage(StatusBarHelper.MSG_INIT_STATUS_BAR);
        mStatusBarHandler.sendMessage(message);
    }

    public void removeStatusBarHelperView() {
        Message message = mStatusBarHandler.obtainMessage(StatusBarHelper.MSG_REMOVE_STATUS_BAR);
        mStatusBarHandler.sendMessageDelayed(message, StatusBarHelper.MSG_REMOVE_DELAY_TIME);
    }

    public int getStatusBarHeight() {
        if (mStatusBarHelperView == null) {
            return 0;
        }
        int[] windowParams = new int[2];
        int[] screenParams = new int[2];
        mStatusBarHelperView.getLocationInWindow(windowParams);
        mStatusBarHelperView.getLocationOnScreen(screenParams);
        return screenParams[1] - windowParams[1];
    }
}

　　

---

20190806更新

 注意：适配8.0时，需initStatusBarHelperView()方法中，要修改两处

1、要给window设置不获取焦点：FLAG_NOT_FOCUSABLE

2、Android8.0时，要用TYPE_APPLICATION_OVERLAY

    private void initStatusBarHelperView() {
        boolean isShown = ServiceManager.getInstance().getInputMethodService().isInputViewShown();
        Log.d(TAG, "initStatusBarHelperView: isShown="+isShown+"  mStatusBarHelperView="+mStatusBarHelperView);
        if (mStatusBarHelperView != null || !isShown) {
            return;
        }
        WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
        mStatusBarHelperView = new View(mContext);
        WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
        lp.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
11                 | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
        lp.gravity = Gravity.LEFT | Gravity.TOP;
14         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
15             lp.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
16         } else {
17             lp.type = WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;
18         }
        lp.format = PixelFormat.TRANSLUCENT;
        lp.width = 1;
        wm.addView(mStatusBarHelperView, lp);
    }

 后来的优化代码见博客：

https://www.cnblogs.com/longjunhao/p/9055087.html