我有两个java文件,NewContact
和ViewContact
。
在这两个中,我的代码都是这样的,适用于 NewContact
:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_contact);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ActionBar actionbar = getSupportActionBar();
actionbar.setDisplayHomeAsUpEnabled(true);
//show the App title
actionbar.setTitle("MyApp");
}
//code for the '<', back button. Go back to PopulistoListView, as defined
//in Manifest, PARENT_ACTIVITY
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
还有我的manifest
(从 <application>
到 </application>
)如下所示:
<application
android:name="com.example.chris.tutorialspoint.AppController"
android:allowBackup="true"
android:label="@string/app_name"
android:theme="@style/Theme.AppCompat.Light.NoActionBar">
<activity
android:name="com.example.chris.tutorialspoint.VerifyUserPhoneNumber"
android:noHistory="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.chris.tutorialspoint.DisplayMyPopulistoListView"
android:launchMode="singleInstance" />
<activity
android:name="com.example.chris.tutorialspoint.PopulistoListView"
android:launchMode="singleInstance" />
<activity android:name="com.example.chris.tutorialspoint.CountryCodes" />
<activity
android:name="com.example.chris.tutorialspoint.ViewContact"
android:noHistory="true" />
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.chris.tutorialspoint.PopulistoListView" />
<activity android:name="com.example.chris.tutorialspoint.EditContact" />
<activity
android:name="com.example.chris.tutorialspoint.NewContact"
android:configChanges="orientation|screenSize">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.chris.tutorialspoint.PopulistoListView" />
</activity><!-- ATTENTION: This was auto-generated to add Google Play services to your project for
App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information. -->
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
然而,当我点击'<'
时按钮位于 ViewContact
我收到错误:
java.lang.IllegalArgumentException: Activity ViewContact does not have a parent activity name specified. (Did you forget to add the android.support.PARENT_ACTIVITY <meta-data> element in your manifest?)
at android.support.v4.app.NavUtils.navigateUpFromSameTask(NavUtils.java:178)
at com.example.chris.tutorialspoint.ViewContact.onOptionsItemSelected(ViewContact.java:405)
at android.app.Activity.onMenuItemSelected(Activity.java:2681)
at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:403)
at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:189)
但是,你可以看到我确实有一个 parent activity
在我的 Manifest
中定义。我做错了什么?
最佳答案
如果您仔细查看 list ,特别是这部分:
<activity
android:name="com.example.chris.tutorialspoint.ViewContact"
android:noHistory="true" />
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.chris.tutorialspoint.PopulistoListView" />
您会看到您关闭了 <activity>
标记在 <meta-data>
之前元素,这意味着 <meta-data>
与整体相关<application>
对象(这是有效的,但不是你想要的)。
更新您的 list ,以便 <meta-data>
元素位于 <activity>
内元素:
<activity
android:name="com.example.chris.tutorialspoint.ViewContact"
android:noHistory="true">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.chris.tutorialspoint.PopulistoListView" />
</activity>
关于java - 使用 setDisplayHomeAsUpEnabled 返回 list 中的 PARENT_ACTIVITY 时出现问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48726434/