//意图的信息设置参考上层源码packageinstaller中的清单文件
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
String type = "application/vnd.android.package-archive";
Uri data = Uri.fromFile(new File("文件路径"));
intent.setDataAndType(data,type);
startActivity(intent);