可以在ViewPagerAdapter之外设置文字或背景颜色吗？

在ViewPagerAdapter.class我有2个布局（whereami.xml和mapview.xml），并使用LayoutInflater来为每个视图充气instantiateItem()，通常我应该在instantiateItem()内设置所有内容（TextView，ImageView等等）。但对我来说，我真的需要在ViewPagerActivity的onCreate()到的setText或背景颜色延伸MapActivity可以在ViewPagerAdapter之外设置文字或背景颜色吗？

是这样，反正有没有设定他们onCreate()？

P.S.我尝试调试程序，发现该进程在调出onCreate()方法之前不会调用instantiateItem()。所以，视图将不会创建，并且每当我尝试设置Text时由于视图为空而导致程序关闭。

ViewPagerActivity

public class ViewPagerActivity extends MapActivity { 
    private ViewPagerAdapter adapter; 
    private ViewPager pager; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     adapter = new ViewPagerAdapter(this); 
     pager = (ViewPager) findViewById(R.id.viewpager); 
     TitlePageIndicator indicator = (TitlePageIndicator) findViewById(R.id.indicator); 
     pager.setAdapter(adapter); 
     indicator.setViewPager(pager); 


     //LinearLayout bgcolor = (LinearLayout)findViewById(R.id.mainlayout); 
     //bgcolor.setBackgroundColor(Color.Black); 
     //TextView text1 = (TextView)findViewById(R.id.text1); 
     //text1.setText("somevalue"); 

    } 


}

ViewPagerAdapter

public class ViewPagerAdapter extends PagerAdapter implements TitleProvider { 
    private final Context context; 
    private MapView mapView; 
    private MapController mapController; 
    private View view; 

    public ViewPagerAdapter(Context context) { 
    } 

    private static String[] titles = new String[] { "Page1", "Map" }; 

    @Override 
    public Object instantiateItem(View pager, final int position) { 
     LayoutInflater inflater = (LayoutInflater) context 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

     if (position == 0) { 
      view = inflater.inflate(R.layout.whereami, null); 
      ((ViewPager) pager).addView(view, 0); 

     } 
     if (position == 1) { 
      view = inflater.inflate(R.layout.my_map_activity, null); 
      ((ViewPager) pager).addView(view, 0); 
      mapView = (MapView) view.findViewById(R.id.mapview); 

      mapController = mapView.getController(); 
      mapController.setZoom(14); 
     } 

     return view; 
    } 

}

whereami.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/mainlayout" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

<TextView 
    android:id="@+id/text1" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:padding="8dp" 
    android:textSize="16sp" > 
</TextView> 
</LinearLayout>

来源

2012-02-08 April Smith

如果你知道onCreate()中的TextView应该是什么，为什么不通过适配器的构造函数呢？

new ViewPagerAdapter(this, "TextToPass");

有了：

private String toDisplay; 
public ViewPagerAdapter(Context context, String toDisplay) { 
    this.toDispay = toDisplay; 
}

和：

view = inflater.inflate(R.layout.whereami, null); 
TextView textView = view.findViewById(R.id.text1); 
textView.setText(toDisplay);

来源

2012-02-08 15:05:45 Graeme

可以在ViewPagerAdapter之外设置文字或背景颜色吗？

回答

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