在工具栏上显示后退箭头 [英] Display Back Arrow on Toolbar

问题描述

我正在从应用程序中的ActionBar迁移到Toolbar. 但是我不知道如何像在Actionbar上那样显示和设置Toolbar上的后退箭头上的click事件.

I'm migrating from ActionBar to Toolbar in my application. But I don't know how to display and set click event on Back Arrow on Toolbar like I did on Actionbar.

使用ActionBar，我呼叫mActionbar.setDisplayHomeAsUpEnabled(true). 但是没有类似的方法.

With ActionBar, I call mActionbar.setDisplayHomeAsUpEnabled(true). But there is no the similar method like this.

有没有人遇到过这种情况，并且以某种方式找到了解决方法?

Has anyone ever faced this situation and somehow found a way to solve it?

推荐答案

如果您使用的是ActionBarActivity，则可以告诉Android将Toolbar用作ActionBar，如下所示:

If you are using an ActionBarActivity then you can tell Android to use the Toolbar as the ActionBar like so:

Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
setSupportActionBar(toolbar);

然后调用

getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);

将起作用.您还可以在ActionBarActivities附带的片段中使用它，您可以像这样使用它:

will work. You can also use that in Fragments that are attached to ActionBarActivities you can use it like this:

((ActionBarActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
((ActionBarActivity) getActivity()).getSupportActionBar().setDisplayShowHomeEnabled(true);

如果您不使用ActionBarActivities，或者要获取未设置为SupportActionBar的Toolbar上的后退箭头，则可以使用以下命令:

If you are not using ActionBarActivities or if you want to get the back arrow on a Toolbar that's not set as your SupportActionBar then you can use the following:

mActionBar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_action_back));
mActionBar.setNavigationOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
       //What to do on back clicked
   }
});

如果使用的是android.support.v7.widget.Toolbar，则应将以下代码添加到AppCompatActivity:

If you are using android.support.v7.widget.Toolbar, then you should add the following code to your AppCompatActivity:

@Override
public boolean onSupportNavigateUp() {
    onBackPressed();
    return true;
}

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