Android工具栏:如果按下向后箭头，如何返回上一个活动 [英] android toolbar: how to go back to previous activity if back arrow is pressed

问题描述

我有一个名为Place

我从以前的活动City进入Place活动.

I come to Place activity from its previous activity called City.

我使用以下代码在Place活动的工具栏中添加了后退按钮:

I have added back button to the toolbar in Place activity using the following code:

    Toolbar mToolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(mToolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true)

我想设置返回按钮以返回City活动

I want to set the back button to go back to City activity

但是City活动需要一些参数传递给它.

But City activity needs some parameters to be passed to it.

因此，如何告诉后退按钮转到城市活动，而无需将参数传递给它.

So how to tell the back button to go to City activity, without need to pass the parameters to it.

推荐答案

在您的backButton中，您只需调用finish();，然后关闭Activity，而无需将参数传递给其他Activity.

In your backButton you just call finish(); and you close Activity without need to pass parameter to other Activity.

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