Android实现系统级悬浮按钮

本文实例为大家分享了Android系统级悬浮按钮的具体代码，供大家参考，具体内容如下

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

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。
![以中间这个中心点为准，以更短的X轴画一个正方形]

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;

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;
  }
  
  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
  }
  
  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
  }
  
  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
  }
  
  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
  }
  
  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
  }
  
  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);
   
   // 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x、y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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