在首选项活动中添加带有后退按钮的操作栏 [英] add action bar with back button in preference activity

问题描述

这是我的偏好活动:

package com.example.hms.test;

import android.os.Bundle;
import android.preference.PreferenceActivity;

public class PrefsActivity extends PreferenceActivity {

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.prefs);
    }

}

在这里，我想显示一个带有名称设置和返回主页的后退按钮的操作栏

here I want to show an actionbar with name settings and a back button to home

推荐答案

您应该做几件事:

1. 将以下内容添加到PreferenceActivity的onCreate中:

1. Add the following to your onCreate of PreferenceActivity:

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

覆盖在PreferenceActivity中选择的onOptionsItem:

Override onOptionsItemSelected in PreferenceActivity:

@Override
 public boolean onOptionsItemSelected(MenuItem item) {
     switch (item.getItemId())
     {
         case android.R.id.home:
             NavUtils.navigateUpFromSameTask(this);
             return true;
     }
     return super.onOptionsItemSelected(item);
 }

为您的PreferenceActivity更改清单中的<activity>标记，如下所示:

change the <activity> tag in manifest for your PreferenceActivity to look something like this:

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

最后将android:launchMode ="singleTop"放入清单中的MainActivity <activity>标记中:

Finally put android:launchMode="singleTop" in your MainActivity <activity> tag in manifest:

<activity
  android:name=".MainActivity"
  android:label="@string/app_name"
  android:launchMode="singleTop"
  android:theme="@style/AppTheme.NoActionBar">
  <intent-filter>
    <action android:name="android.intent.action.MAIN" />

    <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
</activity>

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