当我正在处理某些事情时,我需要在我的应用中配置操作栏 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);}
添加后的
<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>
和
@Override
public void onCreate(Bundle savedInstanceState) {
...
getActionBar().setDisplayHomeAsUpEnabled(true);
}
我做了所有这些 但是在我的程序中,我按下操作栏中的向上按钮,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$3.onClick(ActionBarView.java:206)
09-04 12:54:02.087: E/AndroidRuntime(11033): at android.view.View.performClick(View.java:4261)
09-04 12:54:02.087: E/AndroidRuntime(11033): at android.view.View$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)
一切都像他们说的那样
当然,我已经改变了与我拥有的名字相对应的活动名称
这有什么问题?
答案 0 :(得分:16)
您必须在Maniifest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>
或使用Support-V4,如下所示
NavUtils.navigateUpTo(sourceActivity, upIntent);
或尝试this post
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;
}
}
这是使用android低于API等级11的最佳方式