标题栏中的后退按钮？

Question

我想在标题栏区域放一个后退按钮,继续在Android应用程序中返回活动如何放置该按钮.

就像在这张图片中一样.

Answer 1

Manifest.xml像这样分配父活动:

<activity
    android:name="com.example.myfirstapp.DisplayMessageActivity"
    android:label="@string/title_activity_display_message"
    android:parentActivityName="com.example.myfirstapp.MainActivity" >
    <!-- The meta-data element is needed for versions lower than 4.1 -->
    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value="com.example.myfirstapp.MainActivity" />
</activity>

然后在Activity的onCreate():

ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);

最后在onOptionsItemSelected:

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

如果您需要,还有更多:

Android文档