Android 将返回按钮添加到操作栏

Add back button to action bar

提问by haythem souissi

I have been trying to add a back button to the action bar.

我一直在尝试向操作栏添加后退按钮。

I want my view to look like this:

我希望我的视图看起来像这样：

I want to add the back button in the left of the action bar.

我想在操作栏的左侧添加后退按钮。

I added this code

我添加了这个代码

ActionBar actionBar = getActionBar();

actionBar.setDisplayHomeAsUpEnabled(true);

but it doesn't work.

但它不起作用。

How can I fix this?

我怎样才能解决这个问题？

回答by Danesh

After setting actionBar.setHomeButtonEnabled(true);

设置后 actionBar.setHomeButtonEnabled(true);

Add the following code:

添加以下代码：

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            // app icon in action bar clicked; goto parent activity.
            this.finish();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

回答by clami219

Add

添加

actionBar.setHomeButtonEnabled(true);

and then add the following

然后添加以下内容

@Override
public boolean onOptionsItemSelected(MenuItem menuItem)
{       
    switch (menuItem.getItemId()) {
        case android.R.id.home:
            onBackPressed();
            return true;
        default:
            return super.onOptionsItemSelected(menuItem);
    }
}

As suggested by naXaI've added a check on the itemId, to have it work correctly in case there are multiple buttons on the action bar.

正如naXa所建议的，我在 , 上添加了一个检查itemId，以使其在操作栏上有多个按钮的情况下正常工作。

回答by Jason Saruulo

this one worked for me:

这个对我有用：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_your_activity);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    // ... other stuff
}

@Override
public boolean onSupportNavigateUp(){
    finish();
    return true;
}

The method onSupportNavigateUp() is called when you use the back button in the SupportActionBar.

当您使用 SupportActionBar 中的后退按钮时，将调用 onSupportNavigateUp() 方法。

回答by BoschAlex

After setting

设置后

 actionBar.setHomeButtonEnabled(true);

You have to configure the parent activity in your AndroidManifest.xml

您必须在 AndroidManifest.xml 中配置父活动

<activity
    android:name="com.example.MainActivity"
    android:label="@string/app_name"
    android:theme="@style/Theme.AppCompat" />
<activity
    android:name="com.example.SecondActivity"
    android:theme="@style/Theme.AppCompat" >
    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value="com.example.MainActivity" />
</activity>

Look here for more information http://developer.android.com/training/implementing-navigation/ancestral.html

在这里查看更多信息http://developer.android.com/training/implementing-navigation/ancestral.html

回答by Von Iobro

There are two ways to approach this.

有两种方法可以解决这个问题。

Option 1: Update the Android ManifestIf the settings Activity is always called from the same activity, you can make the relationship in the Android Manifest. Android will automagically show the 'back' button in the ActionBar

选项 1：更新 Android Manifest如果设置 Activity 总是从同一个 Activity 调用，您可以在 Android Manifest 中建立关系。Android 会自动在 ActionBar 中显示“后退”按钮

<activity
    android:name=".SettingsActivity"
    android:label="Setting Activity">
    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value="com.example.example.MainActivity" />
</activity>

Option 2: Change a setting for the ActionBarIf you don't know which Activity will call the Settings Activity, you can create it like this. First in your activity that extends ActionBarActivity (Make sure your @imports match the level of compatibility you are looking for).

选项 2：更改 ActionBar 的设置如果您不知道哪个 Activity 将调用设置 Activity，您可以像这样创建它。首先在扩展 ActionBarActivity 的活动中（确保您的 @imports 匹配您正在寻找的兼容性级别）。

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_settings_test);
    ActionBar actionBar = getSupportActionBar();
    actionBar.setHomeButtonEnabled(true);
    actionBar.setDisplayHomeAsUpEnabled(true);
}

Then, detect the 'back button' press and tell Android to close the currently open Activity.

然后，检测“后退按钮”按下并告诉 Android 关闭当前打开的活动。

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            // app icon in action bar clicked; goto parent activity.
            this.finish();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

That should do it!

应该这样做！

回答by Arunendra

Firstly Use this:

首先使用这个：

ActionBar bar = getSupportActionBar();
bar.setDisplayHomeAsUpEnabled(true);

Then set operation of button click in onOptionsItemSelectedmethod

然后在onOptionsItemSelected方法中设置按钮点击操作

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

回答by advantej

You'll need to check menuItem.getItemId()against android.R.id.homein the onOptionsItemSelectedmethod

你需要检查menuItem.getItemId()针对android.R.id.home的onOptionsItemSelected方法

Duplicate of Android Sherlock ActionBar Up button

重复的Android Sherlock ActionBar 向上按钮

回答by M. Usman Khan

Simpler and better: For API >= 16

更简单更好：对于 API >= 16

Simply add "parentActivityName" for each activity in Manifest. The back button will automatically take u to the parent activity.

只需为 Manifest 中的每个活动添加“parentActivityName”。后退按钮将自动将您带到父活动。

<activity
        android:name="com.example.myfirstapp.DisplayMessageActivity"
        android:label="@string/title_activity_display_message"
        android:parentActivityName="com.example.myfirstapp.MainActivity" >

回答by Amit Vaghela

Use this to show back button and move to previous activity,

使用它来显示后退按钮并移动到上一个活动，

final ActionBar actionBar = getSupportActionBar();
        assert actionBar != null;
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setHomeAsUpIndicator(R.drawable.back_dark);


@Override
    public boolean onOptionsItemSelected(final MenuItem item) {

        switch (item.getItemId()) {
            case android.R.id.home:
                onBackPressed();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

回答by Saad Mahmud

if anyone else need the solution

如果其他人需要解决方案

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    if (id == android.R.id.home) {
        onBackPressed();
    }

    return super.onOptionsItemSelected(item);
}