Android自定义可拖拽的悬浮按钮DragFloatingActionButton

compile 'com.android.support:design:25.3.1'

<android.support.design.widget.FloatingActionButton   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_gravity="right|bottom"   android:src="@drawable/ic_launcher"   />

import android.animation.ObjectAnimator;import android.content.Context;import android.support.design.widget.FloatingActionButton;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.animation.DecelerateInterpolator;public class DragFloatActionButton extends FloatingActionButton { private int screenWidth; private int screenHeight; private int screenWidthHalf; private int statusHeight; private int virtualHeight; public DragFloatActionButton(Context context) {  super(context);  init(); } public DragFloatActionButton(Context context, AttributeSet attrs) {  super(context, attrs);  init(); } public DragFloatActionButton(Context context, AttributeSet attrs, int defStyleAttr) {  super(context, attrs, defStyleAttr);  init(); } private void init() {  screenWidth = ScreenUtils.getScreenWidth(getContext());  screenWidthHalf = screenWidth / 2;  screenHeight = ScreenUtils.getScreenHeight(getContext());  statusHeight = ScreenUtils.getStatusHeight(getContext());  virtualHeight=ScreenUtils.getVirtualBarHeigh(getContext()); } private int lastX; private int lastY; private boolean isDrag; @Override public boolean onTouchEvent(MotionEvent event) {  int rawX = (int) event.getRawX();  int rawY = (int) event.getRawY();  switch (event.getAction() & MotionEvent.ACTION_MASK) {   case MotionEvent.ACTION_DOWN:    isDrag = false;    getParent().requestDisallowInterceptTouchEvent(true);    lastX = rawX;    lastY = rawY;    Log.e("down---->", "getX=" + getX() + "；screenWidthHalf=" + screenWidthHalf);    break;   case MotionEvent.ACTION_MOVE:    isDrag = true;    //计算手指移动了多少    int dx = rawX - lastX;    int dy = rawY - lastY;    //这里修复一些手机无法触发点击事件的问题    int distance= (int) Math.sqrt(dx*dx+dy*dy);    Log.e("distance---->",distance+"");    if(distance<3){//给个容错范围，不然有部分手机还是无法点击     isDrag=false;     break;    }    float x = getX() + dx;    float y = getY() + dy;    //检测是否到达边缘 左上右下    x = x < 0 ? 0 : x > screenWidth - getWidth() ? screenWidth - getWidth() : x;    // y = y < statusHeight ? statusHeight : (y + getHeight() >= screenHeight ? screenHeight - getHeight() : y);    if (y<0){     y=0;    }    if (y>screenHeight-statusHeight-getHeight()){     y=screenHeight-statusHeight-getHeight();    }    setX(x);    setY(y);    lastX = rawX;    lastY = rawY;    Log.e("move---->", "getX=" + getX() + "；screenWidthHalf=" + screenWidthHalf + " " + isDrag+" statusHeight="+statusHeight+ " virtualHeight"+virtualHeight+ " screenHeight"+ screenHeight+" getHeight="+getHeight()+" y"+y);    break;   case MotionEvent.ACTION_UP:    if (isDrag) {     //恢复按压效果     setPressed(false);     Log.e("ACTION_UP---->", "getX=" + getX() + "；screenWidthHalf=" + screenWidthHalf);     if (rawX >= screenWidthHalf) {      animate().setInterpolator(new DecelerateInterpolator())        .setDuration(500)        .xBy(screenWidth - getWidth() - getX())        .start();     } else {      ObjectAnimator oa = ObjectAnimator.ofFloat(this, "x", getX(), 0);      oa.setInterpolator(new DecelerateInterpolator());      oa.setDuration(500);      oa.start();     }    }    Log.e("up---->",isDrag+"");    break;  }  //如果是拖拽则消耗事件，否则正常传递即可。  return isDrag || super.onTouchEvent(event); }}

package com.example.cmos.retrofitdemo;import android.app.Activity;import android.content.Context;import android.graphics.Rect;import android.util.DisplayMetrics;import android.view.Display;import android.view.Window;import android.view.WindowManager;import java.lang.reflect.Method;/** * Created by gongwq on 2017/6/14 0014. */public class ScreenUtils { private ScreenUtils() {  /* cannot be instantiated */  throw new UnsupportedOperationException("cannot be instantiated"); } /**  * 获得屏幕高度  *  * @param context  * @return  */ public static int getScreenWidth(Context context) {  WindowManager wm = (WindowManager) context    .getSystemService(Context.WINDOW_SERVICE);  DisplayMetrics outMetrics = new DisplayMetrics();  wm.getDefaultDisplay().getMetrics(outMetrics);  return outMetrics.widthPixels; } /**  * 获得屏幕宽度  *  * @param context  * @return  */ public static int getScreenHeight(Context context) {  WindowManager wm = (WindowManager) context    .getSystemService(Context.WINDOW_SERVICE);  DisplayMetrics outMetrics = new DisplayMetrics();  wm.getDefaultDisplay().getMetrics(outMetrics);  return outMetrics.heightPixels; } /**  * 获得状态栏的高度  *  * @param context  * @return  */ public static int getStatusHeight(Context context) {  int statusHeight = -1;  try {   Class<?> clazz = Class.forName("com.android.internal.R$dimen");   Object object = clazz.newInstance();   int height = Integer.parseInt(clazz.getField("status_bar_height")     .get(object).toString());   statusHeight = context.getResources().getDimensionPixelSize(height);  } catch (Exception e) {   e.printStackTrace();  }  return statusHeight; } /**  * 获取虚拟功能键高度  */ public static int getVirtualBarHeigh(Context context) {  int vh = 0;  WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);  Display display = windowManager.getDefaultDisplay();  DisplayMetrics dm = new DisplayMetrics();  try {   @SuppressWarnings("rawtypes")   Class c = Class.forName("android.view.Display");   @SuppressWarnings("unchecked")   Method method = c.getMethod("getRealMetrics", DisplayMetrics.class);   method.invoke(display, dm);   vh = dm.heightPixels - windowManager.getDefaultDisplay().getHeight();  } catch (Exception e) {   e.printStackTrace();  }  return vh; } public static int getVirtualBarHeigh(Activity activity) {  int titleHeight = 0;  Rect frame = new Rect();  activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);  int statusHeight = frame.top;  titleHeight = activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop() - statusHeight;  return titleHeight; }}

dragFloatActionButton= (DragFloatActionButton) findViewById(R.id.floatBtn);  dragFloatActionButton.setOnClickListener(this);.... @Override public void onClick(View view) {  switch (view.getId()) {   case R.id.floatBtn:    PopupMenu popupMenu=new PopupMenu(this,view);    getMenuInflater().inflate(R.menu.pop_item,popupMenu.getMenu());    popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {     @Override     public boolean onMenuItemClick(MenuItem menuItem) {      switch (menuItem.getItemId()){       case R.id.action_last:        Toast.makeText(TestActivity.this,""+menuItem.getItemId(),Toast.LENGTH_SHORT).show();        break;       case R.id.action_next:        Toast.makeText(TestActivity.this,""+menuItem.getItemId(),Toast.LENGTH_SHORT).show();        break;      }      return false;     }    });    popupMenu.show();    Log.e("****--->","float");    // Toast.makeText(this,"flaot---",Toast.LENGTH_SHORT).show();    break;  } }

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto"> <item  android:id="@+id/action_delete"  android:orderInCategory="100"  android:title="删除"  app:showAsAction="never" /> <item  android:id="@+id/action_save"  android:orderInCategory="200"  android:title="保存"  app:showAsAction="never" /> <item  android:id="@+id/action_last"  android:orderInCategory="300"  android:title="上一步"  app:showAsAction="never" /> <item  android:id="@+id/action_next"  android:icon="@null"  android:orderInCategory="400"  android:title="下一步"  app:showAsAction="never" /></menu>