用过iphone的朋友都知道，iPhone有个圆球辅助工具，它漂浮在你的手机屏幕(在任何APP之上)，你可以将它移动到任何地方，它叫做AssistiveTouch，本篇模拟该软件实现一个小案例，主要是实现它的界面，首先来看看实现的效果吧：
拖动小圆球：
点击弹出pop窗口：
为了让辅助工具一直悬浮在窗口之上，这里使用的机制是通过在程序初始化是，启动一个service，在service的onCreate() 函数中使用LayoutInflater来加载一个view，而这个view就是辅助球的布局文件：floatball.xml，然后对它进行onclick事件的监听，setOnClickListener监听到辅助球点击事件之后，就创建一个PopupWindow，弹出如上的菜单界面，大体的实现就是这样。
其实，实现窗口悬浮于最前面的一个重要属性是：WindowManager.LayoutParams.TYPE_PHONE
我们只要将WindowManager.LayoutParams的type属性设置为 WindowManager.LayoutParams.TYPE_PHONE就可以实现悬浮最前面。
工程目录结构：
部分代码解析：
MyApplication.java：
[html] view plain copy print ? package com.tyd.floatball.util; import android.app.Application; import android.view.WindowManager; public class MyApplication extends Application { private WindowManager.LayoutParams wmParams = new WindowManager.LayoutParams(); public WindowManager.LayoutParams getMywmParams() { return wmParams; } }
MainActivity.java：
[html] view plain copy print ? package com.tyd.floatball.ui; import com.tyd.floatball.R; import com.tyd.floatball.R.layout; import com.tyd.floatball.service.TopFloatService; import android.app.Activity; import android.content.Intent; import android.os.Bundle; public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Intent service = new Intent(); service.setClass(this, TopFloatService.class); //启动服务 startService(service); } }
TopFloatService.java：
[html] view plain copy print ? package com.tyd.floatball.service; import android.app.Service; import android.content.Intent; import android.graphics.PixelFormat; import android.graphics.Rect; import android.graphics.drawable.BitmapDrawable; import android.os.IBinder; import android.util.DisplayMetrics; import android.view.Gravity; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnKeyListener; import android.view.View.OnTouchListener; import android.view.WindowManager; import android.widget.Button; import android.widget.LinearLayout; import android.widget.PopupWindow; import android.widget.RelativeLayout; import android.widget.Toast; import com.tyd.floatball.R; import com.tyd.floatball.util.MyApplication; public class TopFloatService extends Service implements OnClickListener,OnKeyListener{ WindowManager wm = null; WindowManager.LayoutParams ballWmParams = null; private View ballView; private View menuView; private float mTouchStartX; private float mTouchStartY; private float x; private float y; private RelativeLayout menuLayout; private Button floatImage; private PopupWindow pop; private RelativeLayout menuTop; private boolean ismoving = false; @Override public void onCreate() { super.onCreate(); //加载辅助球布局 ballView = LayoutInflater.from(this).inflate(R.layout.floatball, null); floatImage = (Button)ballView.findViewById(R.id.float_image); setUpFloatMenuView(); createView(); } /** * 窗口菜单初始化 */ private void setUpFloatMenuView(){ menuView = LayoutInflater.from(this).inflate(R.layout.floatmenu, null); menuLayout = (RelativeLayout)menuView.findViewById(R.id.menu); menuTop = (RelativeLayout)menuView.findViewById(R.id.lay_main); menuLayout.setOnClickListener(this); menuLayout.setOnKeyListener(this); menuTop.setOnClickListener(this); } /** * 通过MyApplication创建view，并初始化显示参数 */ private void createView() { wm = (WindowManager) getApplicationContext().getSystemService("window"); ballWmParams = ((MyApplication) getApplication()).getMywmParams(); ballWmParams.type = WindowManager.LayoutParams.TYPE_PHONE; ballWmParams.flags |= WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE; ballWmParams.gravity = Gravity.LEFT | Gravity.TOP; ballWmParams.x = 0; ballWmParams.y = 0; ballWmParams.width = WindowManager.LayoutParams.WRAP_CONTENT; ballWmParams.height = WindowManager.LayoutParams.WRAP_CONTENT; ballWmParams.format = PixelFormat.RGBA_8888; //添加显示层 wm.addView(ballView, ballWmParams); //注册触碰事件监听器 floatImage.setOnTouchListener(new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { x = event.getRawX(); y = event.getRawY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: ismoving = false; mTouchStartX = (int)event.getX(); mTouchStartY = (int)event.getY(); break; case MotionEvent.ACTION_MOVE: ismoving = true; updateViewPosition(); break; case MotionEvent.ACTION_UP: mTouchStartX = mTouchStartY = 0; break; } //如果拖动则返回false，否则返回true if(ismoving == false){ return false; }else{ return true; } } }); //注册点击事件监听器 floatImage.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { DisplayMetrics dm = getResources().getDisplayMetrics(); pop = new PopupWindow(menuView, dm.widthPixels, dm.heightPixels); pop.showAtLocation(ballView, Gravity.CENTER, 0, 0); pop.update(); } }); } /** * 更新view的显示位置 */ private void updateViewPosition() { ballWmParams.x = (int) (x - mTouchStartX); ballWmParams.y = (int) (y - mTouchStartY); wm.updateViewLayout(ballView, ballWmParams); } @Override public IBinder onBind(Intent intent) { return null; } @Override public void onClick(View v) { switch (v.getId()) { case R.id.lay_main: Toast.makeText(getApplicationContext(), "111", 1000).show(); break; default: if(pop!=null && pop.isShowing()){ pop.dismiss(); } break; } } @Override public boolean onKey(View v, int keyCode, KeyEvent event) { Toast.makeText(getApplicationContext(), "keyCode:"+keyCode, 1000).show(); switch (keyCode) { case KeyEvent.KEYCODE_HOME: pop.dismiss(); break; default: break; } return true; } } 辅助球的布局文件 floatball.xml：
[html] view plain copy print ? <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:layout_gravity="center_vertical"> <Button android:id="@+id/float_image" android:layout_width="50dp" android:layout_height="50dp" android:background="@drawable/selector_btn_assistive" /> </FrameLayout> 窗口菜单的布局文件floatmenu.xml：
[html] view plain copy print ? <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/menu" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/transparent" > <LinearLayout android:layout_width="@dimen/size_dialog" android:layout_height="@dimen/size_dialog" android:layout_centerInParent="true" android:background="@drawable/shape_background_assistivetouch" android:orientation="vertical" > <RelativeLayout android:id="@+id/lay_main" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="4.0px" android:visibility="visible" > <TextView android:id="@+id/btn_apps" style="@style/Icon" android:layout_centerInParent="true" android:drawableTop="@drawable/selector_ic_apps" android:text="@string/apps" /> <TextView android:id="@+id/btn_home_screen" style="@style/Icon" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:drawableTop="@drawable/selector_ic_home" android:text="@string/home_screen" /> <TextView android:id="@+id/btn_setting" style="@style/Icon" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:drawableTop="@drawable/selector_ic_phone" android:text="@string/setting" /> <TextView android:id="@+id/btn_lock_screen" style="@style/Icon" android:layout_centerHorizontal="true" android:drawableTop="@drawable/selector_ic_power_down" android:text="@string/lock_screen" /> <TextView android:id="@+id/btn_favor" style="@style/Icon" android:layout_alignParentLeft="true" android:layout_centerVertical="true" android:drawableTop="@drawable/selector_ic_star" android:text="@string/favor" /> </RelativeLayout> </LinearLayout> </RelativeLayout> AndroidManifest.xml：
[html] view plain copy print ? <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.tyd.floatball" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:name=".util.MyApplication"> <activity android:label="@string/app_name" android:name=".ui.MainActivity" > <intent-filter > <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <service android:name=".service.TopFloatService" android:enabled="true" android:exported="true" /> </application> <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> <uses-permission android:name="android.permission.DISABLE_KEYGUARD"/> </manifest>
该实例我已经将源码整理打包，进行了上传，下面是资源的下载地址：
http://download.csdn.net/detail/wulianghuan/5364129
相关资源：敏捷开发V1.0.pptx