eclipse 如何导航到父活动
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How to navigate to a parent activity
提问by Yamen Nassif
Well when im working on something and i need to configure the action bar in my app i started from the http://developer.android.comand i found what i am looking for
好吧，当我在做某事并且我需要在我的应用程序中配置操作栏时，我从http://developer.android.com开始 ，我找到了我要找的东西
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;
}
return super.onOptionsItemSelected(item);}
ofcourse after adding the
当然在添加之后
<activity
android:name="com.example.myfirstapp.DisplayMessageActivity"
android:label="@string/title_activity_display_message"
android:parentActivityName="com.example.myfirstapp.MainActivity" >
<!-- Parent activity meta-data to support 4.0 and lower -->
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.myfirstapp.MainActivity" />
</activity>
and the
和
@Override
public void onCreate(Bundle savedInstanceState) {
...
getActionBar().setDisplayHomeAsUpEnabled(true);
}
i did all of this but when on my program i press the up button in the action bar the program crashes and here is the logcat
我做了所有这些，但是当我在我的程序中按下操作栏中的向上按钮时，程序崩溃了，这是 logcat
09-04 12:54:02.087: E/AndroidRuntime(11033): FATAL EXCEPTION: main
09-04 12:54:02.087: E/AndroidRuntime(11033): java.lang.IllegalArgumentException: Activity LegendActivity does not have a parent activity name specified. (Did you forget to add the android.support.PARENT_ACTIVITY <meta-data> element in your manifest?)
09-04 12:54:02.087: E/AndroidRuntime(11033): at android.support.v4.app.NavUtils.navigateUpFromSameTask(NavUtils.java:177)
09-04 12:54:02.087: E/AndroidRuntime(11033): at com.yay.android.projects.stories.LegendActivity.onOptionsItemSelected(LegendActivity.java:44)
09-04 12:54:02.087: E/AndroidRuntime(11033): at android.app.Activity.onMenuItemSelected(Activity.java:2611)
09-04 12:54:02.087: E/AndroidRuntime(11033): at com.android.internal.widget.ActionBarView.onClick(ActionBarView.java:206)
09-04 12:54:02.087: E/AndroidRuntime(11033): at android.view.View.performClick(View.java:4261)
09-04 12:54:02.087: E/AndroidRuntime(11033): at android.view.View$PerformClick.run(View.java:17356)
09-04 12:54:02.087: E/AndroidRuntime(11033): at android.os.Handler.handleCallback(Handler.java:615)
09-04 12:54:02.087: E/AndroidRuntime(11033): at android.os.Handler.dispatchMessage(Handler.java:92)
09-04 12:54:02.087: E/AndroidRuntime(11033): at android.os.Looper.loop(Looper.java:137)
09-04 12:54:02.087: E/AndroidRuntime(11033): at android.app.ActivityThread.main(ActivityThread.java:4921)
09-04 12:54:02.087: E/AndroidRuntime(11033): at java.lang.reflect.Method.invokeNative(Native Method)
09-04 12:54:02.087: E/AndroidRuntime(11033): at java.lang.reflect.Method.invoke(Method.java:511)
09-04 12:54:02.087: E/AndroidRuntime(11033): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
09-04 12:54:02.087: E/AndroidRuntime(11033): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
09-04 12:54:02.087: E/AndroidRuntime(11033): at dalvik.system.NativeStart.main(Native Method)
everything is just like they said ofcourse i have changed the activity names corresponding to names i have what's the problem here?
一切都和他们说的一样，当然我已经更改了与名称相对应的活动名称 我有什么问题？
回答by Muhannad A.Alhariri
You have to set the parent activity inside the Maniifest file
您必须在清单文件中设置父活动
<activity
android:name="com.example.MainActivity"
android:label="@string/title_activity_main"
android:parentActivityName="com.example.MainUIActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.SampleActivity" />
</activity>
Or use the Support-V4 as follows
或者使用 Support-V4 如下
NavUtils.navigateUpTo(sourceActivity, upIntent);
Or try the solution mentioned in this post
或者试试这篇文章中提到的解决方案
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
Intent upIntent = new Intent(this, YourListActivity.class);
if (NavUtils.shouldUpRecreateTask(this, upIntent)) {
// This activity is not part of the application's task, so
// create a new task
// with a synthesized back stack.
TaskStackBuilder
.from(this)
.addNextIntent(new Intent(this, HomeActivity.class))
.addNextIntent(upIntent).startActivities();
finish();
} else {
// This activity is part of the application's task, so simply
// navigate up to the hierarchical parent activity.
NavUtils.navigateUpTo(this, upIntent);
}
return true;
}
}
This is the best way to do so with android less than API level 11
这是使用低于 API 级别 11 的 android 执行此操作的最佳方法
