使用onOptionsItemSelected从PreferenceArag和PreferenceFragments上升 [英] Using onOptionsItemSelected to go up from PreferenceActivity with PreferenceFragments

问题描述

我在使用Android Studio的默认设置活动（扩展AppCompatPreferenceActivity ）时使用 onOptionsItemSelected 时遇到问题。活动的重要部分是：

I'm having trouble using onOptionsItemSelected with Android Studio's default "Settings Activity" (which extends AppCompatPreferenceActivity). The important parts of the activity are:

public class SettingsActivity extends AppCompatPreferenceActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setupActionBar();
    }

    private void setupActionBar() {
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            // Show the Up button in the action bar.
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
    }

    public static class GeneralPreferenceFragment extends PreferenceFragment {

        // [...]

        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            int id = item.getItemId();
            if (id == android.R.id.home) {
                startActivity(new Intent(getActivity(), SettingsActivity.class));
                return true;
            }
            return super.onOptionsItemSelected(item);
        }
    }

    // two more fragments
}

这适用于片段 - onOptionsItemSelected @Override 运行良好，返回到 SettingsActivity ，但我希望 SettingsActivity 在使用向上按钮时将控制权返回到其父活动。

This works great for the fragments -- the onOptionsItemSelected @Overrides work well, returning to SettingsActivity, but I want SettingsActivity to return control to its parent activity when the up button is used.

我读过文档，我理解

虽然您的片段收到每个菜单项的项目选择回调，但它添加，当用户选择菜单项时，活动首先接收相应的回调。

Although your fragment receives an on-item-selected callback for each menu item it adds, the activity is first to receive the respective callback when the user selects a menu item.

这意味着我不能简单地添加一个类似的 @Override （使用不同的 Intent ）到 SettingsActivity 本身处理我想要的情况，以免碎片重新调整转而使用父活动。

This means I can't simply add a similar @Override (with a different Intent) to SettingsActivity itself to handle the case I want to, lest the fragments return to the parent activity instead.

我试图通过 AndroidManifest.xml 来处理这个问题：

I've attempted handling this via AndroidManifest.xml:

<activity
    android:name=".SettingsActivity"
    android:label="@string/title_activity_settings"
    android:parentActivityName=".BlahBlahActivity" >
    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value="com.example.appthing.BlahBlahActivity" />
</activity>

但这似乎没有做任何事情。

but this doesn't seem to do anything at all.

处理这个问题的好方法是什么？

What's a good way, if any, to deal with this?

推荐答案

在Android创建的模板中Studio onOptionsItemSelected方法属于片段。

In the template created by Android Studio onOptionsItemSelected methods belong to the fragments.

我通过评论它们并为覆盖onBackPressed的活动编写onOptionsItemSelected方法解决了这个问题

I solved by commenting them and writing onOptionsItemSelected method for the activity overriding onBackPressed

@Override
public void onBackPressed() {
    super.onBackPressed();
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == android.R.id.home) {
        onBackPressed();
        return true;
    }
    return super.onOptionsItemSelected(item);
}

这篇关于使用onOptionsItemSelected从PreferenceArag和PreferenceFragments上升的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！