让Android后台运行，不用service

今天因项目需求，让Android后台运行，在网上查找了哈资料，找到了一种比较简单的方式，不用service，模拟home键，该代码只能在启动程序中使用，其他activity会报空异常。贴上代码

//后台运行    private void mainservice(){    PackageManager pm = getPackageManager();   ResolveInfo homeInfo = pm.resolveActivity(new Intent(Intent.ACTION_MAIN)  .addCategory(Intent.CATEGORY_HOME), 0);        ActivityInfo ai = homeInfo.activityInfo;          Intent startIntent = new Intent(Intent.ACTION_MAIN);          startIntent.addCategory(Intent.CATEGORY_LAUNCHER);          startIntent.setComponent(new ComponentName(ai.packageName,                  ai.name));          startActivitySafely(startIntent);    }  //后台运行   private void startActivitySafely(Intent intent){   intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);   try{   startActivity(intent);   }catch (ActivityNotFoundException e) {            Toast.makeText(this, "未发现该activity",                    Toast.LENGTH_SHORT).show();     } catch (SecurityException e) {     Toast.makeText(this, "SecurityException",                    Toast.LENGTH_SHORT).show();    }   }

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