如何在android中修改标签的高度

我在上下文中的内容：：我在这里设置了一个Sherlock actionbar选项卡

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我正在尝试做的事情：

        01-31 15:40:58.270: E/AndroidRuntime(367): FATAL EXCEPTION: main
01-31 15:40:58.270: E/AndroidRuntime(367): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.project.findmybuffet/com.findmybuffet.restaurant_module.MainActivity}: java.lang.NullPointerException
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.os.Handler.dispatchMessage(Handler.java:99)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.os.Looper.loop(Looper.java:123)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread.main(ActivityThread.java:4627)
01-31 15:40:58.270: E/AndroidRuntime(367):  at java.lang.reflect.Method.invokeNative(Native Method)
01-31 15:40:58.270: E/AndroidRuntime(367):  at java.lang.reflect.Method.invoke(Method.java:521)
01-31 15:40:58.270: E/AndroidRuntime(367):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-31 15:40:58.270: E/AndroidRuntime(367):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-31 15:40:58.270: E/AndroidRuntime(367):  at dalvik.system.NativeStart.main(Native Method)
01-31 15:40:58.270: E/AndroidRuntime(367): Caused by: java.lang.NullPointerException
01-31 15:40:58.270: E/AndroidRuntime(367):  at com.findmybuffet.restaurant_module.MainActivity.onCreate(MainActivity.java:24)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
01-31 15:40:58.270: E/AndroidRuntime(367):  ... 11 more

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MainActivity.java

public class MainActivity extends SherlockFragmentActivity {
    // Declare Variables
    private FragmentTabHost mTabHost;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Set the view from main_fragment.xml
        setContentView(R.layout.main_fragment_desc_list_view);

        // Locate android.R.id.tabhost in main_fragment.xml
        mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);

        // Create the tabs in main_fragment.xml
        mTabHost.setup(this, getSupportFragmentManager(), R.id.tabcontent);

        // Create Tab1 with a custom image in res folder
        mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator("Rating"), 
                SortByRatingDescListView.class, null);

        // Create Tab2
        mTabHost.addTab(mTabHost.newTabSpec("tab2").setIndicator("Price"),
                SortByPriceDescListView.class, null);

        }
}

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注意：：代码功能正常，无需在代码行下方添加（降低高度）

如何降低标签的高度？ 我试过了：

//Setting custom height for the tabs
final int height = 45;
mTabHost.getTabWidget().getChildAt(0).getLayoutParams().height = height;
mTabHost.getTabWidget().getChildAt(1).getLayoutParams().height = height;

但我得到的错误是：

        01-31 15:40:58.270: E/AndroidRuntime(367): FATAL EXCEPTION: main
01-31 15:40:58.270: E/AndroidRuntime(367): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.project.findmybuffet/com.findmybuffet.restaurant_module.MainActivity}: java.lang.NullPointerException
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.os.Handler.dispatchMessage(Handler.java:99)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.os.Looper.loop(Looper.java:123)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread.main(ActivityThread.java:4627)
01-31 15:40:58.270: E/AndroidRuntime(367):  at java.lang.reflect.Method.invokeNative(Native Method)
01-31 15:40:58.270: E/AndroidRuntime(367):  at java.lang.reflect.Method.invoke(Method.java:521)
01-31 15:40:58.270: E/AndroidRuntime(367):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-31 15:40:58.270: E/AndroidRuntime(367):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-31 15:40:58.270: E/AndroidRuntime(367):  at dalvik.system.NativeStart.main(Native Method)
01-31 15:40:58.270: E/AndroidRuntime(367): Caused by: java.lang.NullPointerException
01-31 15:40:58.270: E/AndroidRuntime(367):  at com.findmybuffet.restaurant_module.MainActivity.onCreate(MainActivity.java:24)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-31 15:40:58.270: E/AndroidRuntime(367):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
01-31 15:40:58.270: E/AndroidRuntime(367):  ... 11 more

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有没有其他方法可以降低标签的高度。。。。当涉及到零碎的标签页时？ 谢谢，

试试这个