MIUI显示悬浮窗

package com.pandans.hnairexam;

import com.pandans.sunshine.provider.SunShineDB.BookT;

import android.app.Application;
import android.content.Context;
import android.graphics.PixelFormat;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;

public class ExamApplication extends Application {
	private WindowManager.LayoutParams windowParams = null;

	public WindowManager.LayoutParams getWindowParams() {
		if (windowParams == null) {
			createWindowParams();
		}
		return windowParams;
	}

	private WindowManager.LayoutParams createWindowParams() {
		windowParams = new WindowManager.LayoutParams();
		windowParams.type = WindowManager.LayoutParams.TYPE_PHONE;
		windowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
				| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
				| WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;
		windowParams.format = PixelFormat.TRANSLUCENT;
		/*
		 * 注意，flag的值可以为： 下面的flags属性的效果形同“锁定”。 悬浮窗不可触摸，不接受任何事件,同时不影响后面的事件响应。
		 * LayoutParams.FLAG_NOT_TOUCH_MODAL 不影响后面的事件
		 * LayoutParams.FLAG_NOT_FOCUSABLE 不可聚焦 LayoutParams.FLAG_NOT_TOUCHABLE
		 * 不可触摸
		 */
		// 调整悬浮窗口至左上角，便于调整坐标
		windowParams.gravity = Gravity.LEFT | Gravity.TOP;
		// 以屏幕左上角为原点，设置x、y初始值
		windowParams.x = 0;
		windowParams.y = 0;

		setDisplay(windowParams);
		return windowParams;
	}

	/**
	 * 拖动更改位置
	 * 
	 * @param x
	 * @param y
	 */
	public void updateWindows(int x, int y) {
		windowParams.y = y;
		((WindowManager) getSystemService(WINDOW_SERVICE)).updateViewLayout(
				mFloatView, windowParams);
	}

	public void setDisplay(WindowManager.LayoutParams params) {
		DisplayMetrics dm = new DisplayMetrics();
		((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay()
				.getMetrics(dm);
		params.width = LayoutParams.MATCH_PARENT;
		params.height = (int) (dm.heightPixels * 0.4);
		
//		params.height = 200;
	}

	private PFloatView mFloatView;

	public void createView(Context cnt) {
		if (mFloatView == null) {
			mFloatView = new PFloatView(cnt);
			mFloatView.setSpinnerData(cnt, getContentResolver().query(
					BookT.CONTENT_URI, null, null, null, null));
			((WindowManager) getSystemService(WINDOW_SERVICE)).addView(
					mFloatView, getWindowParams());
		}
	}

	public void clearView() {
		if (mFloatView != null) {
			((WindowManager) getSystemService(WINDOW_SERVICE))
					.removeView(mFloatView);
			mFloatView = null;
		}
	}

}