java.lang.NullPointerException android
这是我在控制台中看到的异常,但我找不到解决方案。 这是我的密码:java.lang.NullPointerException android,java,android,exception,Java,Android,Exception,这是我在控制台中看到的异常,但我找不到解决方案。 这是我的密码: public class MainActivity extends TabActivity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
public class MainActivity extends TabActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Resources res = getResources(); // Resource object to get Drawables
TabHost tabHost = getTabHost(); // The activity TabHost
TabHost.TabSpec spec; // Resusable TabSpec for each tab
Intent intent; // Reusable Intent for each tab // Create an Intent to launch an Activity for the tab (to be reused)
intent = new Intent().setClass(this, Collections.class);
spec = tabHost.newTabSpec("Collections").setIndicator("Collections") .setContent(intent);
tabHost.addTab(spec);
// Do the same for the other tabs
intent = new Intent().setClass(this, MyStampii.class);
spec = tabHost.newTabSpec("MyStampii").setIndicator("My Stampii") .setContent(intent);
tabHost.addTab(spec);
// Do the same for the other tabs
intent = new Intent().setClass(this, Notices.class);
spec = tabHost.newTabSpec("Notices").setIndicator("Notices") .setContent(intent);
tabHost.addTab(spec);
// Do the same for the other tabs
intent = new Intent().setClass(this, Tutorial.class);
spec = tabHost.newTabSpec("Tutorial").setIndicator("Tutorial") .setContent(intent);
tabHost.addTab(spec);
// Do the same for the other tabs
intent = new Intent().setClass(this, Settings.class);
spec = tabHost.newTabSpec("Settings").setIndicator("Settings") .setContent(intent);
tabHost.addTab(spec);
}
}
还有main.xml
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp">
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:padding="5dp" />
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0" />
</LinearLayout>
</TabHost>
有什么想法吗?无论如何,谢谢你的帮助 尝试在java文件中使用
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.tabs);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.win_title);
并使xml布局如下所示
<LinearLayout android:id="@+id/l1" android:layout_width="fill_parent" android:layout_height="fill_parent"
android:orientation="vertical" android:padding="5dp">
<TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content"
android:scrollbars="horizontal"/>
<FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent"
android:padding="5dp"/>
</LinearLayout>
希望这能起作用不确定这是否有帮助,但在哪一行引发异常?时出现了类似的错误,您确定这是完整的异常堆栈跟踪吗?没有“原因”?是的,我很确定,这就是整个异常stracktrace…它仍然出现
<LinearLayout android:id="@+id/l1" android:layout_width="fill_parent" android:layout_height="fill_parent"
android:orientation="vertical" android:padding="5dp">
<TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content"
android:scrollbars="horizontal"/>
<FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent"
android:padding="5dp"/>
</LinearLayout>