点击应用程序图标不会触发onOptionsItemSelected（）

问题描述

我目前工作的一个Android应用程序。我想使用的应用程序图标的操作栏，导航到家的活动。我读了此页面，所有需要做的是添加一个 onOptionsItemSelected 并查找ID android.R.id.home 。

这是我想要的preSS的应用程序图标，返回 HomeActivity ，我在我的活动已经实现了code。

@覆盖公共布尔onOptionsItemSelected（菜单项项）{    开关（item.getItemId（））{    案例android.R.id.home：        意向意图=新的意图（这一点，HomeActivity.class）;        intent.addFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;        startActivity（意向）;        返回true;    默认：        返回super.onOptionsItemSelected（项目）;    }}

然而，什么也没有发生。调试时，我可以看到，点击该图标不会触发 onOptionsItemSelected（）可言。我必须做一些与地方的图标？截至目前，它的所有默认情况下，仅这在的Andr​​oidManifest.xml

＆lt;应用    机器人：图标=@可绘制/ ic_launcher    机器人：标签=@字符串/ APP_NAME＆GT;

解决方案

有关包目标定位API 14级开始，你需要通过调用<$c$c>setHomeButtonEnabled()

在您的onCreate，添加以下内容：

 如果（Build.VERSION.SDK_INT＆GT; = Build.VERSION_ codeS.ICE_CREAM_SANDWICH）{
    getActionBar（）setHomeButtonEnabled（真）。
}
 

I'm currently working on an Android app. I would like to use the app icon in the action bar to navigate to the "home" activity. I read on this page that all that needs to be done is to add an onOptionsItemSelected and look for the id android.R.id.home.

This is the code that I have implemented in my activity where I want to press the app icon to return to HomeActivity.

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

However, nothing happens. When debugging, I can see that clicking the icon doesn't trigger the onOptionsItemSelected() at all. Do I have to do something with the icon somewhere? As of now, it's all default, just this in the AndroidManifest.xml

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >

解决方案

For packages targetting API level 14 onwards, you need to enable the home button by calling setHomeButtonEnabled()

In your onCreate, add the following:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
    getActionBar().setHomeButtonEnabled(true);
}

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