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我有一個viewpager,我正在使用它作爲雜誌電子閱讀器應用程序中的主要導航元素。我已經定義了一個佈局來充當每個文章的「封面」,並且這些顯示都很好。不過,我想通過膨脹不同的佈局來每6次顯示廣告。所以,在viewpager適配器的instantiateItem方法上,我有以下語句:if ((position != 0) && (position%6 == 0) && (adsShown < ads.size()))
。該計劃啓動罰款和文章的意見充分適當。但是,當我到達應顯示廣告的位置時,視圖是空白的。爲什麼是這樣?爲什麼我的viewpager返回空白視圖?
下面是instantiateItem方法的完整代碼:
@Override
public Object instantiateItem(View arg0, int position) {
if ((position != 0) && (position%2 == 0) && (adsShown < ads.size())){
View v = getLayoutInflater().inflate(R.layout.adview, null);
ImageView adImg = (ImageView)v.findViewById(R.id.adImage);
adImg.setImageBitmap(ads.get(adsShown).image);
v.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(ads.get(adsShown).linkURL));
startActivity(browserIntent);
}
});
adsShown++;
System.out.println("ADSSHOWN" + adsShown);
return v;
}
else{
Article s = toShow.get(position-adsShown);
View v = getLayoutInflater().inflate(R.layout.previewpage, null);
TextView hl = (TextView)v.findViewById(R.id.coverHl);
ImageView img = (ImageView)v.findViewById(R.id.coverImg);
TextView blurb = (TextView)v.findViewById(R.id.coverBlurb);
TextView author = (TextView)v.findViewById(R.id.coverAuthor);
TextView bot = (TextView)v.findViewById(R.id.coverBot);
hl.setText(s.title);
img.setImageBitmap(s.image);
blurb.setText(Html.fromHtml(s.excerpt));
author.setText("by "+ s.author.name);
bot.setText(s.cats.get(0).name + " // " + s.date);
v.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
Article topass = showing;
// System.out.println("XXYYZZAA: " + topass.headline);
intent.setClassName("com.calib.caliber", "com.calib.caliber.ArticleView");
// intent.putExtra("title", topass.title);
intent.putExtra("a", topass);
// intent.putExtra("author", topass.author.name);
// intent.putExtra("content", topass.content);
// intent.putExtra("id", topass.ID);
startActivityForResult(intent, 1);
}
});
((ViewPager) arg0).addView(v);
return v;
}
}
,這裏是爲AD瀏覽活動的XML佈局文件:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000">
<TextView
android:id = "@+id/adText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text = "advertisement"
android:textColor="#FFFFFF"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"></TextView>
<ImageView
android:id = "@+id/adImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below = "@id/adText">
</ImageView>
</RelativeLayout>
哎呀,謝謝你指出。 – drewmoore 2013-03-03 22:54:25