android 应用内部悬浮可拖动按钮简单实现代码

本文介绍了android 应用内部悬浮可拖动按钮简单实现代码,分享给大家,具体如下:

可以悬浮在activity上面,在加载fragment时悬浮按钮不会消失

实现方式很简单,因为是在应用内部拖动的,只需要通过Activity获取WindowManager,然后将要拖动的view设置上去就行

设置代码:

WindowManager wm = (WindowManager) activity.getSystemService(Context.WINDOW_SERVICE);

DisplayMetrics dm = new DisplayMetrics();

activity.getWindowManager().getDefaultDisplay().getMetrics(dm);

//通过像素密度来设置按钮的大小

dpi = dpi(dm.densityDpi);

//屏宽

screenWidth = wm.getDefaultDisplay().getWidth();

//屏高

screenHeight = wm.getDefaultDisplay().getHeight();

//布局设置

wmParams = new WindowManager.LayoutParams();

// 设置window type

wmParams.type = WindowManager.LayoutParams.TYPE_APPLICATION;

wmParams.format = PixelFormat.RGBA_8888; // 设置图片格式,效果为背景透明

wmParams.gravity = Gravity.LEFT | Gravity.TOP;

// 设置Window flag

wmParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;

wmParams.width = dpi;

wmParams.height = dpi;

wmParams.y = (screenHeight - dpi) >> 1;

wm.addView(this, wmParams);

控件的大小根据像素密度来进行设置的

/**

* 根据密度选择控件大小

*

*/

private int dpi(int densityDpi) {

if (densityDpi <= 120) {

return 36;

} else if (densityDpi <= 160) {

return 48;

} else if (densityDpi <= 240) {

return 72;

} else if (densityDpi <= 320) {

return 96;

}

return 108;

}

主要的处理问题就是控件的拖动问题,通过重写onTouchEvent方法进行处理

源码:

import android.app.Activity;

import android.content.Context;

import android.graphics.PixelFormat;

import android.util.DisplayMetrics;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.MotionEvent;

import android.view.View;

import android.view.WindowManager;

import android.widget.RelativeLayout;

import android.widget.TextView;

/**

* Created by xiang on 2016/12/28.

*

* im悬浮窗视图

*/

public class ChatView extends RelativeLayout{

// 悬浮栏位置

private final static int LEFT = 0;

private final static int RIGHT = 1;

private final static int TOP = 3;

private final static int BUTTOM = 4;

private int dpi;

private int screenHeight;

private int screenWidth;

private WindowManager.LayoutParams wmParams;

private WindowManager wm;

private float x, y;

private float mTouchStartX;

private float mTouchStartY;

private boolean isScroll;

public ChatView(Activity activity) {

super(activity);

LayoutInflater.from(activity).inflate(R.layout.view_chat, this);

setBackgroundResource(R.drawable.chat_btn);

wm = (WindowManager) activity.getSystemService(Context.WINDOW_SERVICE);

DisplayMetrics dm = new DisplayMetrics();

activity.getWindowManager().getDefaultDisplay().getMetrics(dm);

//通过像素密度来设置按钮的大小

dpi = dpi(dm.densityDpi);

//屏宽

screenWidth = wm.getDefaultDisplay().getWidth();

//屏高

screenHeight = wm.getDefaultDisplay().getHeight();

//布局设置

wmParams = new WindowManager.LayoutParams();

// 设置window type

wmParams.type = WindowManager.LayoutParams.TYPE_APPLICATION;

wmParams.format = PixelFormat.RGBA_8888; // 设置图片格式,效果为背景透明

wmParams.gravity = Gravity.LEFT | Gravity.TOP;

// 设置Window flag

wmParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;

wmParams.width = dpi;

wmParams.height = dpi;

wmParams.y = (screenHeight - dpi) >> 1;

wm.addView(this, wmParams);

hide();

}

/**

* 根据密度选择控件大小

*

*/

private int dpi(int densityDpi) {

if (densityDpi <= 120) {

return 36;

} else if (densityDpi <= 160) {

return 48;

} else if (densityDpi <= 240) {

return 72;

} else if (densityDpi <= 320) {

return 96;

}

return 108;

}

public void show() {

if (isShown()) {

return;

}

setVisibility(View.VISIBLE);

}

public void hide() {

setVisibility(View.GONE);

}

public void destory() {

hide();

wm.removeViewImmediate(this);

}

@Override

public boolean onTouchEvent(MotionEvent event) {

// 获取相对屏幕的坐标, 以屏幕左上角为原点

x = event.getRawX();

y = event.getRawY();

switch (event.getAction()) {

case MotionEvent.ACTION_DOWN:

// setBackgroundDrawable(openDrawable);

// invalidate();

// 获取相对View的坐标,即以此View左上角为原点

mTouchStartX = event.getX();

mTouchStartY = event.getY();

break;

case MotionEvent.ACTION_MOVE:

if (isScroll) {

updateViewPosition();

} else {

// 当前不处于连续滑动状态 则滑动小于图标1/3则不滑动

if (Math.abs(mTouchStartX - event.getX()) > dpi / 3

|| Math.abs(mTouchStartY - event.getY()) > dpi / 3) {

updateViewPosition();

} else {

break;

}

}

isScroll = true;

break;

case MotionEvent.ACTION_UP:

// 拖动

if (isScroll) {

autoView();

// setBackgroundDrawable(closeDrawable);

// invalidate();

} else {

// 当前显示功能区,则隐藏

// setBackgroundDrawable(openDrawable);

// invalidate();

}

isScroll = false;

mTouchStartX = mTouchStartY = 0;

break;

}

return true;

}

/**

* 自动移动位置

*/

private void autoView() {

// 得到view在屏幕中的位置

int[] location = new int[2];

getLocationOnScreen(location);

//左侧

if (location[0] < screenWidth / 2 - getWidth() / 2) {

updateViewPosition(LEFT);

} else {

updateViewPosition(RIGHT);

}

}

/**

* 手指释放更新悬浮窗位置

*

*/

private void updateViewPosition(int l) {

switch (l) {

case LEFT:

wmParams.x = 0;

break;

case RIGHT:

int x = screenWidth - dpi;

wmParams.x = x;

break;

case TOP:

wmParams.y = 0;

break;

case BUTTOM:

wmParams.y = screenHeight - dpi;

break;

}

wm.updateViewLayout(this, wmParams);

}

// 更新浮动窗口位置参数

private void updateViewPosition() {

wmParams.x = (int) (x - mTouchStartX);

//是否存在状态栏(提升滑动效果)

// 不设置为全屏(状态栏存在) 标题栏是屏幕的1/25

wmParams.y = (int) (y - mTouchStartY - screenHeight / 25);

wm.updateViewLayout(this, wmParams);

}

}

使用方法:

//传入上下文Activity

ChatView chatView = new ChatView(this);

chatView.show();

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