Android:可移动悬浮框

                    
                            importandroid.app.Activity;
            importandroid.content.Context;
            importandroid.content.SharedPreferences;
            importandroid.content.SharedPreferences.Editor;
            importandroid.graphics.PixelFormat;
            importandroid.os.Bundle;
            importandroid.util.Log;
            importandroid.view.Gravity;
            importandroid.view.LayoutInflater;
            importandroid.view.MotionEvent;
            importandroid.view.View;
            importandroid.view.View.OnTouchListener;
            importandroid.view.WindowManager;
            importandroid.view.WindowManager.LayoutParams;
            importandroid.widget.TextView;
            
            publicclassFrameActivityextendsActivity{
            /**Calledwhentheactivityisfirstcreated.*/
            privatestaticfinalStringTAG="FloatFrameActivity";
            privatestaticfinalbooleanDEBUG=true;
            privateViewmViews;
            privateTextViewmView;
            //窗口管理器
            privateWindowManagermWindowManager;
            //布局参数
            privateWindowManager.LayoutParamsmLayoutParams;
            
            //上次使用时悬浮框在屏幕中的坐标
            privateintlastX=0;
            privateintlastY=0;
            
            //屏幕大小
            privatestaticintmWidth;
            privatestaticintmHidth;
            
            @Override
            protectedvoidonPause(){
            super.onPause();
            //保存最后一次使用的位置
            SharedPreferenceslocation=getSharedPreferences("Location",Context.MODE_PRIVATE);
            Editoredit=location.edit();
            edit.putInt("lastX",lastX);
            edit.putInt("lastY",lastY);
            edit.commit();
            if(DEBUG)Log.i(TAG,"--->onPaust");
            }
            
            @Override
            protectedvoidonStart(){
            
            super.onStart();
            //取出上次使用的位置
            SharedPreferenceslocation=this.getSharedPreferences("Location",Context.MODE_PRIVATE);
            lastX=location.getInt("lastX",(mWidth-mViews.getWidth())/2);
            lastY=location.getInt("lastY",(mHidth-mViews.getHeight())/2);
            updateFloatFrame();
            if(DEBUG)Log.i(TAG,"--->onStart");
            }
            
            @Override
            protectedvoidonDestroy(){
            super.onDestroy();
            removeFloatFrame();
            if(DEBUG)Log.i(TAG,"--->onDestroy");
            }
            
            @Override
            publicvoidonCreate(BundlesavedInstanceState){
            super.onCreate(savedInstanceState);
            
            setContentView(R.layout.main);
            //得到屏幕的大小
            mWidth=getWindowManager().getDefaultDisplay().getWidth();
            mHidth=getWindowManager().getDefaultDisplay().getHeight();
            //显示悬浮窗
            init();
            if(DEBUG)Log.i(TAG,"--->onCreate");
            }
            
            //删除悬浮框
            privatevoidremoveFloatFrame(){
            mWindowManager.removeView(mViews);
            if(DEBUG)Log.i(TAG,"--->FloatFrameremoved");
            }
            
            //更新悬浮框
            privatevoidupdateFloatFrame(){
            mLayoutParams.x=lastX;
            mLayoutParams.y=lastY;
            mWindowManager.updateViewLayout(mViews,mLayoutParams);
            if(DEBUG)Log.i(TAG,"--->FloatFrameupdated");
            }
            
            privatevoidinit(){
            
            /*必须添加权限：<uses-permissionandroid:name="android.permission.SYSTEM_ALERT_WINDOW"/>
            */
            //获得窗口管理器
            mWindowManager=(WindowManager)this.getSystemService(Context.WINDOW_SERVICE);
            mLayoutParams=newLayoutParams();
            
            //悬浮框布局
            mLayoutParams.width=LayoutParams.WRAP_CONTENT;
            mLayoutParams.height=LayoutParams.WRAP_CONTENT;
            
            mLayoutParams.gravity=Gravity.LEFT|Gravity.TOP;
            
            
            //悬浮框在屏幕中的初始位置
            mLayoutParams.x=lastX;
            mLayoutParams.y=lastY;
            
            mLayoutParams.type=LayoutParams.TYPE_PHONE;
            
            //设置半透明
            mLayoutParams.format=PixelFormat.TRANSLUCENT;
            mLayoutParams.flags=LayoutParams.FLAG_NOT_FOCUSABLE|LayoutParams.FLAG_NOT_TOUCH_MODAL;
            
            //获得悬浮窗布局视图
            mViews=LayoutInflater.from(this).inflate(R.layout.frame,null);
            
            //从悬浮窗布局视图中获取显示电话号码的TextView
            mView=(TextView)mViews.findViewById(R.id.text_view);
            //将悬浮框添加到窗口管理器中
            mWindowManager.addView(mViews,mLayoutParams);
            //给整个悬浮框添加OnTouch事件
            mView.setOnTouchListener(newOnTouchListener(){
            floatx=0,y=0;
            publicbooleanonTouch(Viewv,MotionEventevent){
            switch(event.getAction()){
            caseMotionEvent.ACTION_DOWN:
            x=event.getX();
            y=event.getY();
            break;
            caseMotionEvent.ACTION_MOVE:
            updateViewPosition(v,event);
            break;
            caseMotionEvent.ACTION_UP:
            break;
            }
            
            returntrue;
            }
            
            //更新悬浮框
            privatevoidupdateViewPosition(Viewv,MotionEventevent){
            lastX=(int)(event.getRawX()-x);
            //38为状态栏的宽度
            lastY=(int)(event.getRawY()-y)-38;
            //窗口管理器更新悬浮框
            updateFloatFrame();
            }
            });
            }
            }
        
Java代码
                            <?xmlversion="1.0"encoding="utf-8"?>
                <TextViewxmlns:android="http://schemas.android.com/apk/res/android"
                android:id="@+id/text_view"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:background="@android:color/transparent"
                android:layout_gravity="center"
                android:text="悬浮框">
                </TextView>
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