activity跳转到fragment

问题：如何实现从一个activity跳转到MainActivity中的一个fragment，并且底部的RadioButton不变？

回答：通过使用自定义变量，如type，来进行传值判断。

例子：

[java] view
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type = getIntent().getIntExtra("type", 0);

// 判断type是否为1

if (type == 1) {

// 声明GoodsInfoFragment对象

// GoodsInfoFragment goodsInfoFragment = new GoodsInfoFragment();

// 传值

// Bundle bundle = new Bundle();

// bundle.putInt("id", getIntent().getIntExtra("id", 0));

// System.out.println(getIntent().getIntExtra("id", 0)+"////////");

// goodsInfoFragment.setArguments(bundle);

// 跳转界面

transaction.add(R.id.main_content, new LoginFragment(), "login");

}

if (type == 2) {

// 声明TransmitWorkFragment对象

TransmitWorkFragment transmitWorkFragment = null;

if (position == 1) {

transmitWorkFragment = new TransmitWorkFragment(type);

} else {

transmitWorkFragment = new TransmitWorkFragment();

}

// 跳转界面

transaction.add(R.id.main_content, transmitWorkFragment,

"transmitwork");

[java] view
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Intent intent=new Intent(HomeworkNoActivity.this,MainActivity.class);

intent.putExtra("type", 1);

startActivity(intent);