如何启用home键，返回到一个共同的活动？ [英] How to enable the home button to return to a common activity?

问题描述

我用 ActionbarSherlock 并想使home键...
因此，我呼吁 setHomeButtonEnabled（真）在我的基地活动。

I use ActionbarSherlock and would like to enable the home button ...
Therefore I call setHomeButtonEnabled(true) in my base activity.

public class BaseFragmentActivity extends SherlockFragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        setTheme(R.style.Theme_Sherlock);
        super.onCreate(savedInstanceState);
        getSupportActionBar().setHomeButtonEnabled(true); // Here
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home: {
                Intent intent = new Intent(this, HomeActivity.class);
                // startActivity(intent);
                // startActivityIfNeeded(intent, 0);
                return true;
            }
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}

当我使用 startActivity（意向）或 startActivityIfNeeded（意向，0）的 HomeActivity 重新创建每次（活动呈现一个地图并重新创建它很讨厌）。

When I use startActivity(intent) or startActivityIfNeeded(intent, 0) the HomeActivity is recreated everytime (the activity renders a map and recreating it is annoying).

• 我不想叫完成（） 自它只是把我带回到了应用层次中的一个步骤。相反，我一直想重返 HomeActivity 。
• 另外这将是很好，如果行为可能在的Andr​​oidManifest.xml ，因为它描述的的动作条和setDisplayHomeAsUpEnabled（）。
• 这也可能是常识的清除backstack 当我回到 HomeActivity 。什么是对你的看法？

• I do not want to call finish() since it just takes me back one step in the app hierarchy. Instead I always want to return to the HomeActivity.
• Further it would be nice if the behavior could be configured in AndroidManifest.xml as it is described for the ActionBar and setDisplayHomeAsUpEnabled().
• It might also be common sense to clear the backstack when I return to the HomeActivity. What is your opinion on that?

推荐答案

在Android的文档，我发现我正在寻找：您可以设置的标记 FLAG_ACTIVITY_CLEAR_TOP 清除后退堆栈。第二标志 FLAG_ACTIVITY_SINGLE_TOP 避免重新启动活动的，如果组合使用之前提到的标志

In the Android documentation I found what I was searching for: You can set the flag FLAG_ACTIVITY_CLEAR_TOP to clear the back stack. The second flag FLAG_ACTIVITY_SINGLE_TOP avoid restarting the activity if used in combination with the flag mentioned before.

case android.R.id.home: {
    Intent intent = new Intent(this, HomeActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    startActivityIfNeeded(intent, 0);
    return true;
}

这样做的目的需要使用传递<一href="http://developer.android.com/reference/android/app/Activity.html#startActivityIfNeeded%28android.content.Intent,%20int,%20android.os.Bundle%29"相对=nofollow> startActivityIfNeeded（） 。

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