Android的操作栏主页按钮 [英] Android action bar home button

问题描述

我设置我的行动吧，像这样，但没有任何反应，当我点击了首页上按钮。 下面启用，因此这两个选项应该不会，它会自动转到主页活动呢？

  ab.setHomeButtonEnabled（真正的）;
ab.setDisplayHomeAsUpEnabled（真正的）;
 

操作栏

  @覆盖
公共布尔onCreateOptionsMenu（功能菜单）{
    MenuInflater充气= getMenuInflater（）;
    inflater.inflate（R.menu.menu，菜单）;

    最终的String []的活动;
    资源RES = getResources（）;
    活动= res.getStringArray（R.array.activities）;

    动作条AB = getActionBar（）;
    ab.setHomeButtonEnabled（真正的）;
    ab.setDisplayHomeAsUpEnabled（真正的）;
    ab.setTitle（R.string.app_name）;
    ab.setNavigationMode（ActionBar.NAVIGATION_MODE_LIST）;
    ab.show（）;

    / **创建一个数组适配器来填充的DropDownList * /
    ArrayAdapter＆LT;字符串＆GT;适配器=新的ArrayAdapter＆LT;字符串＆GT;（getBaseContext（），android.R.layout.simple_spinner_dropdown_item，活动）;

    / **设置下拉列表项和项目导航侦听器的动作条* /
    。getActionBar（）setListNavigationCallbacks（适配器，navigationListener）;

    / **启用下拉列表导航操​​作栏* /
    。getActionBar（）setNavigationMode（ActionBar.NAVIGATION_MODE_LIST）;
    返回true;
}
 

解决方案

至于其他人说，该行为不会自动发生 - 你需要告诉它去哪里

。

不过，我需要添加另一个答案，因为目前的答案是的所有的突破Android的设计准则 - 返回=家庭。请参见的文档

你真正想要做的是什么沿着这行的东西：

  @覆盖
公共布尔onOptionsItemSelected（菜单项菜单项）{
    开关（menu​​Item.getItemId（））{
        案例android.R.id.home：
            意图homeIntent =新的意图（这一点，HomeActivity.class）;
            homeIntent.addFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;
            startActivity（homeIntent）;
    }
    返程（super.onOptionsItemSelected（菜单项））;
}
 

，将带你到父活动，而不是仅仅通过后面的堆栈。我还添加了 Intent.Flag 清除后退堆栈，这是一个有益的去一个家庭活动时，并能阻止后面堆得到一个懵懵懂懂地有如果用户使用的是向上按钮

I've set my action bar like so but nothing happens when I click the home up button. The two options below are enabled so shouldn't it go to the home activity automatically?

ab.setHomeButtonEnabled(true);
ab.setDisplayHomeAsUpEnabled(true);

Action Bar

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu, menu);

    final String[] activities;
    Resources res = getResources();
    activities =  res.getStringArray(R.array.activities);

    ActionBar ab = getActionBar();
    ab.setHomeButtonEnabled(true);
    ab.setDisplayHomeAsUpEnabled(true);
    ab.setTitle(R.string.app_name);
    ab.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
    ab.show();

    /** Create an array adapter to populate dropdownlist */
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getBaseContext(), android.R.layout.simple_spinner_dropdown_item, activities);

    /** Setting dropdown items and item navigation listener for the actionbar */
    getActionBar().setListNavigationCallbacks(adapter, navigationListener);

    /** Enabling dropdown list navigation for the action bar */
    getActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
    return true;
}

解决方案

As other people have said, the behaviour doesn't happen automatically - you need to tell it where to go.

However, I need to add another answer, as the current answers are all breaking Android design guidelines - Back != Home. See the documentation

What you really want to be doing is something along the lines of this:

@Override
public boolean onOptionsItemSelected(MenuItem menuItem) {
    switch (menuItem.getItemId()) {
        case android.R.id.home:
            Intent homeIntent = new Intent(this, HomeActivity.class);
            homeIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(homeIntent);
    }
    return (super.onOptionsItemSelected(menuItem));
}

Which will take you to the parent activity, rather than just go through the back stack. I've also added the Intent.Flag to clear the back stack, it's a useful one to have when going to a home activity and can stop the back stack getting in a muddle when your users are using the 'Up' button

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