Android 系统级悬浮按钮的实现

具体的需求
1、就是做一个系统级的悬浮按钮,就像iPhone 桌面的那个悬浮按钮效果一样,能随意拖动,并且手一放开,悬浮按钮就自动靠边。
2、可以点击并且可以随意拖动。
3、悬浮按钮自动靠边的时候,或者移动到边上的时候,自动隐藏半边。
4、横竖屏切换都兼容

实现方法
1、就在WindowManager 里面添加View,这个View通过自定义控件来实现。
2、在onTouch里的MotionEvent.ACTION_MOVE事件里头,通过控制悬浮按钮的具体坐标来实现随意移动。
3、在onTouch里的MotionEvent.ACTION_UP事件里头,来控制悬浮按钮自动靠边,并且自动隐藏半边,不过在这里onTouch和onClick这两个事件是一起触发的,不过这也有解决办法,你可以在手放开的瞬间,通过移动的距离,来决定是否触发点击事件,,如果返回false,就会触发点击事件,如果返回true就会触发点击事件
4、通过自定义控件onLayout方法,来捕获横竖屏切换事件,
5、还有一个靠哪边停靠的问题,通过坐标来判读更靠近哪一边。就靠哪边停靠。

下面是具体实现代码:


import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Point;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;

import com.iapppay.openid.channel.LoginResultCallback;
import com.iapppay.openid.channel.OpenIDApplication;
import com.iapppay.openid.channel.util.DisplayUtil;
import com.iapppay.openid.channel.util.LogUtil;
import com.iapppay.openid.channel.util.Res;

/**
 * Created by HuangTiebing 2017/2/14.
 */

public class DragFloatActionButton extends ImageView implements View.OnTouchListener, View.OnClickListener {

    public static String TAG = "DragFloatActionButton";
    private Context context;

    float lastX, lastY;
    float originX, originY;
    int screenWidth;
    int screenHeight;
    private int originWidth;

    private WindowManager windowManager;
    //    // 此windowManagerParams变量为获取的全局变量,用以保存悬浮窗口的属性
    private WindowManager.LayoutParams windowManagerParams;

    private LoginResultCallback resultCallback; //悬浮按钮点击回调

    public DragFloatActionButton(Context context, boolean isForceLogin, LoginResultCallback resultCallback) {
        this(context, null);
        OpenIDApplication.getInstance().setForceLogin(isForceLogin);
        this.resultCallback = resultCallback;
    }

    public DragFloatActionButton(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public DragFloatActionButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.context = context;

        Point screenSize = DisplayUtil.getScreenSize(context);
        screenWidth = screenSize.x;
        screenHeight = screenSize.y;
        setImageResource(Res.drawable(context, "ipay_float_btn_bg"));
        setOnTouchListener(this);
        setOnClickListener(this);

        windowManager = (WindowManager) getContext().getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
    }

    public int getOriginWidth() {
        return originWidth;
    }

    public void setOriginWidth(int originWidth) {
        this.originWidth = originWidth;
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        windowManagerParams = (WindowManager.LayoutParams) this.getLayoutParams();
        //获取到状态栏的高度
        Rect frame = new Rect();
        getWindowVisibleDisplayFrame(frame);
        int ea = event.getAction();
        switch (ea) {
            case MotionEvent.ACTION_DOWN:
                lastX = event.getRawX();// 获取触摸事件触摸位置的原始X坐标
                lastY = event.getRawY();
                originX = lastX;
                originY = lastY;
                break;
            case MotionEvent.ACTION_MOVE:
                float dx = event.getRawX() - lastX;
                float dy = event.getRawY() - lastY;
                windowManagerParams.x += dx;
                windowManagerParams.y += dy;
                LogUtil.d(TAG, "移动距离:dx=" + dx + ",dy=" + dy);
                showAllBtn();
                lastX = (int) event.getRawX();
                lastY = (int) event.getRawY();
                break;
            case MotionEvent.ACTION_UP:
                float lastMoveDx = Math.abs(event.getRawX() - originX);
                float lastMoveDy = Math.abs(event.getRawY() - originY);
                LogUtil.d(TAG, "松开时,移动距离:lastMoveDx=" + lastMoveDx + ", lastMoveDy=" + lastMoveDy);
                if (lastMoveDx < 10 && lastMoveDy < 10) { //移动距离太小,视为点击,
                    return false;
                } else {
                    updateViewLayout(event);
                    isFirstClick = true;
                    return true;
                }
        }
        return false;
    }

    /**
     * 显示整个图标
     */
    public void showAllBtn() {
        windowManagerParams.width = originWidth;
        windowManagerParams.height = originWidth;
        setImageResource(Res.drawable(context, "ipay_float_btn_bg"));
        windowManager.updateViewLayout(this, windowManagerParams); // 刷新显示
    }

    /**
     * 悬浮按钮显示在左边
     */
    private void showInLeft() {
        windowManagerParams.x = 0;
        windowManagerParams.width = originWidth / 2;
        windowManagerParams.height = originWidth;
        setImageResource(Res.drawable(context, "ipay_float_btn_left_hidden"));
        windowManager.updateViewLayout(this, windowManagerParams); // 刷新显示
    }

    /**
     * 悬浮按钮显示在右边
     */
    private void showInRight() {
        windowManagerParams.width = originWidth / 2;
        windowManagerParams.height = originWidth;
        windowManagerParams.x = screenWidth - windowManagerParams.width;
        setImageResource(Res.drawable(context, "ipay_float_btn_right_hidden"));
        windowManager.updateViewLayout(this, windowManagerParams); // 刷新显示
    }

    /**
     * 悬浮按钮显示在上面
     */
    private void showInTop() {
        windowManagerParams.y = 0;
        windowManagerParams.width = originWidth;
        windowManagerParams.height = originWidth / 2;
        setImageResource(Res.drawable(context, "ipay_float_btn_top_hidden"));
        windowManager.updateViewLayout(this, windowManagerParams); // 刷新显示
    }

    /**
     * 悬浮按钮显示在下面
     */
    private void showInBottom() {
        windowManagerParams.width = originWidth;
        windowManagerParams.height = originWidth / 2;
        windowManagerParams.y = screenHeight - windowManagerParams.width;
        setImageResource(Res.drawable(context, "ipay_float_btn_bottom_hidden"));
        windowManager.updateViewLayout(this, windowManagerParams); // 刷新显示
    }

    /**
     * 更新悬浮图标
     *
     * @param event 手动移动事件
     */
    public void updateViewLayout(MotionEvent event) {
        Point center = new Point(screenWidth / 2, screenHeight / 2); //屏幕中心点
        float xOffset, yOffset;//以屏幕中心点为原点,X轴和Y轴上的偏移量
        if (event != null) {//手动移动的
            xOffset = event.getRawX() - center.x;
            yOffset = event.getRawY() - center.y;
        } else {//自动隐藏
            xOffset = lastX - center.x;
            yOffset = lastY - center.y;
        }
        if (Math.abs(xOffset) >= Math.abs(yOffset)) {//向左或向右缩进隐藏
            if (xOffset <= 0) { //向左缩进
                showInLeft();
            } else {
                showInRight();
            }
        } else {//向上或向下缩进隐藏
            if (yOffset <= 0) {//向上缩进
                showInTop();
            } else {
                showInBottom();
            }
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        Point screenSize = DisplayUtil.getScreenSize(context);
        if (screenWidth != screenSize.x) {//屏幕旋转切换
            screenWidth = screenSize.x;
            screenHeight = screenSize.y;
            lastY = windowManagerParams.x;
            lastX = windowManagerParams.y;
            windowManagerParams.x = (int) lastX;
            windowManagerParams.y = (int) lastY;
            updateViewLayout(null);
        }
    }

    private boolean isFirstClick = true;

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }

    @Override
    public void onClick(View v) {
        LogUtil.d(TAG, "执行点击事件");
        if (!isFirstClick) {
            OpenIDApplication.getInstance().floatBtnClick(context, OpenIDApplication.getInstance().isForceLogin(), resultCallback);
        } else {//半隐藏状态,点击显示全部
            isFirstClick = false;
            showAllBtn();
        }
    }

}

调用实现代码,这里注意有个问题,弹出系统级的悬浮窗,需要配置权限:
并且android 6.0以上的手机,还要弹出对话框问用户是否运行,如果这个用户拒绝了,就不能弹出系统级的悬浮窗了,还有个别手机厂商修改了android源码,还需要进系统设置里去允许这个应用弹出悬浮窗。这样的话就体验感非常不好,不过这里有个小技巧,按下面方式设置为toast类型就完全解决,既不用配置权限,也不弹出窗来向用户获取权限,完全解决问题。

WindowManager.LayoutParams windowManagerParams = new WindowManager.LayoutParams(WindowManager.LayoutParams.TYPE_TOAST,
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.TRANSLUCENT);

具体实现代码如下:

DragFloatActionButton  floatBtn = new DragFloatActionButton(context, isForceLogin, mResultCallback);

            WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
            // 设置LayoutParams(全局变量)相关参数
            WindowManager.LayoutParams windowManagerParams = new WindowManager.LayoutParams(WindowManager.LayoutParams.TYPE_TOAST,
                    WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    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
            windowManagerParams.gravity = Gravity.LEFT | Gravity.TOP;
            // 以屏幕左上角为原点,设置xy初始值
            windowManagerParams.x = 0;
            windowManagerParams.y = 0;
            // 设置悬浮窗口长宽数据
            floatBtn.measure(0, 0);
            floatBtn.setOriginWidth(floatBtn.getMeasuredWidth() - 50);
            windowManagerParams.width = floatBtn.getOriginWidth();
            windowManagerParams.height = windowManagerParams.width;
            // 显示myFloatView图像
            windowManager.addView(floatBtn, windowManagerParams);

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