在service和BroadCastReceiver中 啟動activity和alertdialog

引用：http://3387980.blog.51cto.com/3377980/982784

啟動activity源碼:(記得要加上Intent.FLAG_ACTIVITY_NEW_TASK)

 

  
Intent intent = new Intent();  
  
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);   
  
intent.setClass(getApplicationContext(),FileBrowserActivity.class);  
  
startActivity(intent); 
 
啟動alertDialog源碼:
  

   
        AlertDialog.Builder builder = new AlertDialog.Builder(this);  
   
        builder.setMessage("是否接受檔案?")  
   
                .setPositiveButton("是", new DialogInterface.OnClickListener() {  
   
                    @Override 
   
                    public void onClick(DialogInterface dialog, int which) {  
   
 
   
                    }  
   
                }).setNegativeButton("否", new OnClickListener() {  
   
                    @Override 
   
                    public void onClick(DialogInterface dialog, int which) {  
   
                    }  
   
                });  
   
        AlertDialog ad = builder.create();  
   
//      ad.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG); //系統中關機對話方塊就是這個屬性   
   
        ad.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);  
   
        ad.setCanceledOnTouchOutside(false);                                   //點擊外面地區不會讓dialog消失  
   
        ad.show(); 
  
還要加上許可權 
  

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