我的 android 应用程序正在使用支持 v4 库:
<uses-sdk
android:minSdkVersion="7"
android:maxSdkVersion="19"
android:targetSdkVersion="19" />
它只是作为一个新项目创建的。当我在手机上运行它并按下菜单按钮时,它会崩溃:
12-21 15:12:54.170 31705-31705/com.talkweb.woplus E/AndroidRuntime: 致命异常: android.support.v7.app.ActionBarImplICS.getThemedContext(ActionBarImplICS.java:287) 处的主要 java.lang.NullPointerException android.support.v7.app.ActionBarImplJB.getThemedContext(ActionBarImplJB.java:20) 在 android.support.v7.app.ActionBarActivityDelegate.getMenuInflater(ActionBarActivityDelegate.java:98) 在 android.support.v7.app.ActionBarActivity.getMenuInflater( ActionBarActivity.java:71) 在 com.talkweb.woplus.HomeActivity.onCreateOptionsMenu(HomeActivity.java:35) 在 android.app.Activity.onCreatePanelMenu(Activity.java:2652)
HomeActivity.java 中的代码:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE); // I add this line
setContentView(R.layout.activity_home);
if (savedInstanceState == null) {
webViewFragment = new WebViewFragment();
getSupportFragmentManager().beginTransaction()
.add(R.id.container, webViewFragment)
.commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.home, menu); // line: 35
return true;
}
样式.xml:
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat">
</style>
</resources>
显现:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.talkweb.woplus">
<uses-permission android:name="android.permission.INTERNET" />
<uses-sdk
android:minSdkVersion="7"
android:maxSdkVersion="19"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:theme="@style/AppTheme"
android:label="@string/app_name">
<activity
android:name="com.talkweb.woplus.HomeActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
菜单:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.talkweb.woplus.HomeActivity" >
<item android:id="@+id/action_settings"
android:title="@string/action_settings"
android:orderInCategory="100"
android:showAsAction="ifRoom|withText"
app:showAsAction="ifRoom|withText" />
</menu>