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我需要一些幫助來了解我失蹤或做錯了什麼。我的目標是在選中時將我的選項卡的背景色設置爲白色,未選中時將其設置爲黑色。但開始我只是試圖設置背景顏色爲紅色,作爲代碼測試:getTabHost()。getTabWidget()。getChildAt(0).setBackgroundColor(Color.parseColor(「#4E4E9C」));。我的代碼甚至在它開始之前崩潰了應用程序,原因如下:二進制XML文件行#19:您必須提供一個layout_width屬性。我無能爲力?我錯過了什麼?這與寬度屬性有什麼關係? /問候我無法設置我的標籤的背景顏色?
public class Tabs extends TabActivity
{
private static final String TAG = "TabHostActivity";
private boolean mHaveShownStartDialog = false;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.tab_host);
setOnCreatePreferences();
try
{
addTab(getString(R.string.Search), R.drawable.searchtab, SearchTask.class);
addTab(getString(R.string.Bookmarks), R.drawable.blackheart1, Bookmarks.class);
addTab(getString(R.string.Latest), R.drawable.clock3, Latest.class);
addTab(getString(R.string.QAndA), R.drawable.pen, LatestFeedback.class);
getTabHost().setCurrentTab(0);
getTabHost().getTabWidget().getChildAt(0).setBackgroundColor(Color.parseColor("#4E4E9C"));
}
catch(Exception e)
{
Log.e(TAG, e.getMessage());
}
}
private void addTab(CharSequence label, int drawable_id, Class<?> c)
{
TabHost.TabSpec spec = getTabHost().newTabSpec("tab" + " "+ label);
spec.setIndicator(label, getResources().getDrawable(drawable_id));
spec.setContent(new Intent().setClass(this, c));
getTabHost().addTab(spec);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.tabs_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.tabs_menu_options_item:
//startActivityForResult(new Intent(this, Options.class) , 0);
return true;
default: return super.onOptionsItemSelected(item);
}
}
//private void initTabsAppearance(TabWidget tabWidget){
//
// for(int i=0; i<tabWidget.getChildCount(); i++)
// tabWidget.getChildAt(i).setBackgroundResource(R.drawable.searchtab);
//
//}
private void setOnCreatePreferences()
{
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
boolean mUseStartDialog = preferences.getBoolean("use_dialog", true);
if(mUseStartDialog)
{
if(!mHaveShownStartDialog)
{
mHaveShownStartDialog = true;
startActivity(new Intent(this, WelcomeDialog.class));
}
}
}
}
我tab_host.xml
<?xml version="1.0" encoding="utf-8"?>
<TabHost
android:id="@android:id/tabhost"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
</TabHost>