仿iPhone的AssistiveTouch 悬浮辅助球工具
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：
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：
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：
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：
<?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：
<?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：
<?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