步骤：

1.到窗口管理器对象WindowManager wm，

2.得到布局文件构造的一个view，

3.构造WindowManager.LayoutParams()布局参数wparam

4.使用窗口布局管理器将view按照wparam的布局来显示mWM.addView(view, params);

代码：

package com.itheima.mobilesafe.service;import android.app.Service;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.graphics.PixelFormat;import android.os.IBinder;import android.telephony.PhoneStateListener;import android.telephony.TelephonyManager;import android.view.Gravity;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.view.WindowManager;import android.widget.TextView;import com.itheima.mobilesafe.R;import com.itheima.mobilesafe.dao.NumberAddressDao;import com.itheima.mobilesafe.receiver.OutCallBroadcastReceiver;public class NumberAddressService extends Service {	private WindowManager mWM;	private WindowManager.LayoutParams params;	private View view;	private OutCallBroadcastReceiver receiver;	private SharedPreferences sp;		@Override	public IBinder onBind(Intent intent) {		return null;	}	@Override	public void onCreate() {		super.onCreate();		TelephonyManager tm = (TelephonyManager) this				.getSystemService(TELEPHONY_SERVICE);		// 监听电话的呼叫状态		tm.listen(new MyPhoneStateListener(),				PhoneStateListener.LISTEN_CALL_STATE);		//取消监听代码		// tm.listen(listener, PhoneStateListener.LISTEN_NONE);		receiver = new OutCallBroadcastReceiver();		// 添加接收事件类型		IntentFilter filter = new IntentFilter();		filter.addAction("android.intent.action.NEW_OUTGOING_CALL");		// 注册广播接收者		registerReceiver(receiver, filter);	}	private class MyPhoneStateListener extends PhoneStateListener {		/**		 * 电话的呼叫状态发生变化时会调用这个方法		 */		@Override		public void onCallStateChanged(int state, String incomingNumber) {			super.onCallStateChanged(state, incomingNumber);			switch (state) {			case TelephonyManager.CALL_STATE_IDLE:// 空闲状态				// 电话挂断时移除归属地提示框				if (view != null) {					mWM.removeView(view);					view = null;				}				break;			case TelephonyManager.CALL_STATE_RINGING:// 铃声响起状态				// 查询号码归属地				String address = NumberAddressDao						.queryNumberAddress(incomingNumber);				// Toast.makeText(NumberAddressService.this, address, 0).show();				getMyToast(address);				break;			case TelephonyManager.CALL_STATE_OFFHOOK:// 接通状态				break;			default:				break;			}		}	}	private void getMyToast(String address) {		sp = getSharedPreferences("config", Context.MODE_PRIVATE);		int which = sp.getInt("which", 0);//		private String[] items = new String[] { "半透明", "活力橙", "金屬灰", "衛士藍",//				"蘋果綠" };		int[] ids = new int[] { R.drawable.call_locate_white,				R.drawable.call_locate_orange, R.drawable.call_locate_gray,				R.drawable.call_locate_blue, R.drawable.call_locate_green };		view = View.inflate(this, R.layout.show_toast, null);		view.setBackgroundResource(ids[which]);		//给view添加一个触摸的监听器		view.setOnTouchListener(new OnTouchListener() {			private int startX = 0;			private int startY = 0;			@Override			public boolean onTouch(View v, MotionEvent event) {				// 得到触摸事件的类型				int action = event.getAction();								switch (action) {				case MotionEvent.ACTION_DOWN:// 按下的事件					startX = (int) event.getRawX();					startY = (int) event.getRawY();										break;				case MotionEvent.ACTION_MOVE:// 移动的事件					//2、在移动的过程中得到结束坐标点					int endX = (int) event.getRawX();					int endY = (int) event.getRawY();										//3、计算移动的偏移量					int dX = endX - startX;					int dY = endY - startY;					//4、更新图标的位置					params.x +=dX;					params.y +=dY;					if(params.x < 0){						params.x = 0;					}										if(params.y < 0){						params.y = 0;					}					if(params.x > mWM.getDefaultDisplay().getWidth()-view.getWidth()){						params.x = mWM.getDefaultDisplay().getWidth()-view.getWidth();					}										if(params.y > mWM.getDefaultDisplay().getHeight()-view.getHeight()){						params.y = mWM.getDefaultDisplay().getHeight()-view.getHeight();					}					//4、更新图标的位置					mWM.updateViewLayout(view, params);										//5、得到新的开始坐标点					startX = (int) event.getRawX();					startY = (int) event.getRawY();					break;				case MotionEvent.ACTION_UP:// 抬起的事件					int lastX = params.x ;					int lastY = params.y;										Editor editor = sp.edit();					editor.putInt("lastX", lastX);					editor.putInt("lastY", lastY);					editor.commit();					break;				}				return true;			}		});		TextView tv = (TextView) view.findViewById(R.id.tv_address);		// 在自定义的吐司上显示归属地		tv.setText(address);		// 得到系统提供窗口管理器		mWM = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);		// 得到布局文件的参数对象		params = new WindowManager.LayoutParams();		// 设置布局文件显示用到的参数		//添加显示时参考的位置		params.gravity = Gravity.LEFT + Gravity.TOP;		//根据之前保存的显示位置来显示当前位置		int lastX = sp.getInt("lastX", 0);		int lastY = sp.getInt("lastY", 0);		params.x = lastX;		params.y = lastY;				params.height = WindowManager.LayoutParams.WRAP_CONTENT;		params.width = WindowManager.LayoutParams.WRAP_CONTENT;		params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE//				| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE				| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;		params.format = PixelFormat.TRANSLUCENT;		// params.windowAnimations =		// com.android.internal.R.style.Animation_Toast;		params.type = WindowManager.LayoutParams.TYPE_PRIORITY_PHONE;		// 在窗口中显示自定义的吐司		mWM.addView(view, params);		// mWM.removeView(view);	}	@Override	public void onDestroy() {		super.onDestroy();		// 取消掉已经注册的广播接收者		unregisterReceiver(receiver);	}}

show_toast.xml