Android Service中弹出全局对话框

View view = View.inflate(StatusBarService.this, R.layout.power_off_dialog, null); 
                AlertDialog.Builder b = new AlertDialog.Builder(StatusBarService.this); 
                b.setView(view); 
                final AlertDialog d = b.create(); 
                d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG); //系统中关机对话框就是这个属性 
                //d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); //窗口可以获得焦点，响应操作 
                //d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY); //窗口不可以获得焦点，点击时响应窗口后面的界面点击事件 
                d.show(); 

                Button yesButton = (Button) view.findViewById(R.id.yes_button); 
                Button canclButton = (Button) view.findViewById(R.id.cancl_button); 

                yesButton.setOnClickListener(new View.OnClickListener() { 

                    @Override 
                    public void onClick(View v) { 
                        Intent intent = new Intent(Intent.ACTION_REQUEST_SHUTDOWN); 
                        intent.putExtra(Intent.EXTRA_KEY_CONFIRM, false); 
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
                        startActivity(intent); 
                    } 
                }); 

                canclButton.setOnClickListener(new View.OnClickListener() { 

                    @Override 
                    public void onClick(View v) { 
                        d.dismiss(); 
                    } 
                }); 

最后记得加权限：

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW" />