android 实现自由移动的悬浮按钮

实现原理
主要是通过android中的WindowManager中的addview（）把view加载进来，设置WindowManager.LayoutParams windowManagerParams的相关属性，例如x，y；在view的onTouchEvent中改变x，y从而实现悬浮按钮的自由移动

1、自定义一个类FloatView继承自ImageView

public class FloatView extends ImageView{     private float mTouchX;     private float mTouchY;     private float x;     private float y;     private float mStartX;     private float mStartY;     private OnClickListener mClickListener;     private WindowManager windowManager = (WindowManager) getContext()             .getApplicationContext().getSystemService(Context.WINDOW_SERVICE);     // 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 = ((FloatApplication) getContext()             .getApplicationContext()).getWindowParams();     public FloatView(Context context) {         super(context);     }     @Override     public boolean onTouchEvent(MotionEvent event) {         //获取到状态栏的高度         Rect frame = new Rect();         getWindowVisibleDisplayFrame(frame);         int statusBarHeight = frame.top;         // 获取相对屏幕的坐标，悬浮窗口所在的位置        x = event.getRawX();         y = event.getRawY() - statusBarHeight; // statusBarHeight是系统状态栏的高度         switch (event.getAction()) {         case MotionEvent.ACTION_DOWN: // 捕获手指触摸按下动作             // 获取相对View的坐标，即以此View左上角为原点             mTouchX = event.getX();             mTouchY = event.getY();             mStartX = x;             mStartY = y;             break;         case MotionEvent.ACTION_MOVE: // 捕获手指触摸移动动作             updateViewPosition();             break;         case MotionEvent.ACTION_UP: // 捕获手指触摸离开动作             updateViewPosition();             mTouchX = mTouchY = 0;             if ((x - mStartX) < 5 && (y - mStartY) < 5) {                 if(mClickListener!=null) {                     mClickListener.onClick(this);                 }             }             break;         }         return 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     } }

2、定义一个FloatApplication类继承Application，为了防止悬浮按钮超出相应的范围

public class FloatApplication extends Application {     private WindowManager.LayoutParams windowParams = new WindowManager.LayoutParams();     public WindowManager.LayoutParams getWindowParams() {         return windowParams;     } }

3、在相应的Activity中创建悬浮按钮

protected static void createFloatView(int paddingBottom) {          floatView = new FloatView(mContext);        floatView.setOnTouchListener(new OnTouchListener() {            @Override            public boolean onTouch(View v, MotionEvent ev) {                int action=ev.getAction();                switch (action) {                case MotionEvent.ACTION_DOWN:                    v.setBackgroundResource(R.drawable.scan_ss);                    break;                case MotionEvent.ACTION_UP:                    v.setBackgroundResource(R.drawable.scan_sss);                    break;                default:                    break;                }                return false;            }        });        floatView.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                ATService.handler.obtainMessage(11).sendToTarget();            }        });         floatView.setImageResource(R.drawable.scan_sss); // 这里简单的用自带的icon来做演示         // 获取WindowManager         windowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);         int screenWidth = windowManager.getDefaultDisplay().getWidth();          int screenHeight = windowManager.getDefaultDisplay().getHeight();          // 设置LayoutParams(全局变量）相关参数         windowManagerParams = ((FloatApplication) mContext.getApplicationContext()).getWindowParams();         windowManagerParams.type = LayoutParams.TYPE_PHONE; // 设置window type，主要是让悬浮按钮以什么类型显示         windowManagerParams.format = PixelFormat.RGBA_8888; // 设置图片格式，效果为背景透明         // 设置Window flag         windowManagerParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL                 | LayoutParams.FLAG_NOT_FOCUSABLE;         /*          * flag的值可以为：          * 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 ，即控制悬浮按钮的初始位置        windowManagerParams.x = screenWidth;         windowManagerParams.y = screenHeight/2;         // 设置悬浮窗口长宽数据         windowManagerParams.width = LayoutParams.WRAP_CONTENT;         windowManagerParams.height = LayoutParams.WRAP_CONTENT;         // 显示myFloatView图像         windowManager.addView(floatView, windowManagerParams);        isFolat=true;    }

注意最后比忘记了在AndroidManifest.xml添加相应的权限

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />//修改application的android：name属性 就是把之前定义的FloatApplication，前面则是FloatApplication所在的包名<application        android:icon="@drawable/icon"        android:name="com.scpark.floatwindow.FloatApplication"        android:label="@string/application_label" >

4、自由移动悬浮按钮的打开和关闭的代码

createFloatView(100);//创建windowManager.removeView(floatView);//关闭悬浮按钮

希望对各位有所帮助，若有不对的地方，欢迎指证，谢谢。

android 实现自由移动的悬浮按钮

android 实现自由移动的悬浮按钮

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