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怎么在Android中实现一个悬浮按钮？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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);
关于怎么在Android中实现一个悬浮按钮问题的解答就分享到这里了，希望以上内容可以对大家有一定的帮助，如果你还有很多疑惑没有解开，可以关注亿速云行业资讯频道了解更多相关知识。
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