本文实例讲述了Android实现带磁性的悬浮窗体效果。分享给大家供大家参考，具体如下：

带磁性的悬浮窗体，类似于360绿色小人

主要实现的是:

1.悬浮所有窗体之上

2.有吸引力，吸附于屏幕边上

3.有点击效果

下面我就实现上面三点，简单封装了个FloatView

先看下本次Demo的效果图，然后再看代码，

效果图：

FloatView代码如下

package com.manymore13.flowwindowdemo; import android.content.Context; import android.graphics.PixelFormat; import android.graphics.Rect; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.Log; import android.view.Gravity; import android.view.MotionEvent; import android.view.WindowManager; import android.view.WindowManager.LayoutParams; import android.widget.ImageView; /** * @author manymore13 * @version 1.0 */ public class FloatView extends ImageView{ private float mTouchX; private float mTouchY; private float x; private float y; private int startX; private int startY; private Context c; private int imgId = R.drawable.ic_launcher; private int controlledSpace = 20; private int screenWidth; boolean isShow = false; private OnClickListener mClickListener; private WindowManager windowManager ; private WindowManager.LayoutParams windowManagerParams = new WindowManager.LayoutParams(); public FloatView(Context context, AttributeSet attrs) { super(context, attrs); } public FloatView(Context c) { super(c); initView(c); } // 初始化窗体 public void initView(Context c) { windowManager = (WindowManager) c.getApplicationContext().getSystemService(Context.WINDOW_SERVICE); screenWidth = windowManager.getDefaultDisplay().getWidth(); this.setImageResource(imgId); windowManagerParams.type = LayoutParams.TYPE_PHONE; windowManagerParams.format = PixelFormat.RGBA_8888; // 背景透明 windowManagerParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL | LayoutParams.FLAG_NOT_FOCUSABLE; // 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 = 200; // 设置悬浮窗口长宽数据 windowManagerParams.width = LayoutParams.WRAP_CONTENT; windowManagerParams.height = LayoutParams.WRAP_CONTENT; } public void setImgResource(int id) { imgId = id; } @Override public boolean onTouchEvent(MotionEvent event) { x = event.getRawX(); y = event.getRawY(); switch(event.getAction()) { case MotionEvent.ACTION_DOWN: { mTouchX = event.getX(); mTouchY = event.getY(); startX = (int) event.getRawX(); startY = (int) event.getRawY(); break; } case MotionEvent.ACTION_MOVE: { updateViewPosition(); break; } case MotionEvent.ACTION_UP: { if(Math.abs(x - startX) < controlledSpace && Math.abs(y - startY) < controlledSpace) { if(mClickListener != null) { mClickListener.onClick(this); } } Log.i("tag", "x="+x+" startX+"+startX+" y="+y+" startY="+startY); if(x <= screenWidth/2) { x = 0; }else{ x = screenWidth; } updateViewPosition(); break; } } return super.onTouchEvent(event); } // 隐藏该窗体 public void hide() { if(isShow) { windowManager.removeView(this); isShow = false; } } // 显示该窗体 public void show() { if(isShow == false) { windowManager.addView(this, windowManagerParams); isShow = true; } } @Override public void setOnClickListener(OnClickListener l) { this.mClickListener = l; } private void updateViewPosition() { // 更新浮动窗口位置参数 windowManagerParams.x = (int) (x - mTouchX); windowManagerParams.y = (int) (y - mTouchY); windowManager.updateViewLayout(this, windowManagerParams); // 刷新显示 } }

完整实例代码点击此处本站下载。

如果需要用上面的类可以这样做

floatView = new FloatView(this); // 创建窗体 floatView.setOnClickListener(this); // 设置事件，你需要实现FloatView里的onclick接口 floatView.show(); // 显示该窗体 floatView.hide(); // 隐藏窗体

PS 不要忘记在manifest里加上权限（更多manifest功能与权限可参考本站：Android Manifest功能与权限描述大全：http://tools.jb51.net/table/AndroidManifest）

上面有个bug 就是点击的时候view下移

public int getStatusBarHeight() { int titleBarHeight = 0; Rect frame = new Rect(); mAct.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); titleBarHeight = frame.top; if (titleBarHeight == 0) { int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android"); if (resourceId > 0) { titleBarHeight = getResources().getDimensionPixelSize(resourceId); } } return titleBarHeight; }

希望本文所述对大家Android程序设计有所帮助。