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问题描述
我正在尝试实现视图寻呼机，在我的视图寻呼机图像来自服务器，我能够显示和滚动但是当我到达最后一张图像时它显示错误并且应用程序崩溃了，以下是我的代码段
I am trying to implement view pager,in my view pager images comes from server,I am able to display and scroll but when i reach at last image it shows error and app got crash,following is my snippet code
public class Test_Pager extends Activity{
private String strtd;
String[] imgStr;
ImageView imageView;
ArrayList<String> userImgArrayList;
String[] myURLs;
/*country list*/
JSONArray country_list=null;
private ServiceHandler sh;
private String jsonStr;
private JSONObject jsonObj;
private String user_img;
private String user_pro;
private static String PROFILE_VIEW_URL = "";
private static final String USER_IMG="product_images";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.test_pagerss);
userImgArrayList = getIntent().getStringArrayListExtra("user_images");
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
ImageAdapter adapter = new ImageAdapter(this);
viewPager.setAdapter(adapter);
imageView = (ImageView) findViewById(R.id.full_image_view);
PROFILE_VIEW_URL="";
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
sh = new ServiceHandler();
// Making a request to url and getting response
jsonStr = sh.makeServiceCall(PROFILE_VIEW_URL, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
try {
jsonObj = new JSONObject(jsonStr);
/*proview_business = jsonObj.getString(PROFILE_VIEW_BUSINESS);
proview_subcat = jsonObj.getString(PROFILE_VIEW_SUB_CATAGORY);
proview_mainpro = jsonObj.getString(PROFILE_VIEW_MAINPRODUCTS);
proview_expr = jsonObj.getString(PROFILE_VIEW_EXPERIENCE);
proview_cmpname = jsonObj.getString(PROFILE_VIEW_COMPANYNAME);
proview_website = jsonObj.getString(PROFILE_VIEW_WEBSITE);*/
// user_img=jsonObj.getString(USER_IMG);
user_img=jsonObj.getString(USER_IMG);
user_img = "";
userImgArrayList = new ArrayList<String>();//declare userImgArrayList globally like ArrayList<String> userImgArrayList;
JSONArray picarray = jsonObj.getJSONArray(USER_IMG);
for(int i=0;i< picarray.length();i++)
{
user_img = picarray.getString(i);
userImgArrayList.add(user_img);
Log.d("mylog", "curent pro pic = " + user_img);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
public class ImageAdapter extends PagerAdapter {
Context context;
ImageAdapter(Context context)
{
this.context=context;
}
@Override
public int getCount() {
return USER_IMG.length();
}
@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeView((View) object);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((ImageView) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView imageView = new ImageView(context);
int padding = context.getResources().getDimensionPixelSize(
R.dimen.activity_horizontal_margin);
imageView.setPadding(padding, padding, padding, padding);
//imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
//Picasso.with(context).load(userImgArrayList.get(position)).into(imageView);
Picasso.with(context).load(userImgArrayList.get(position)).resize(200, 200) .into(imageView);
/*for(int i=0; i<myURLs.length;i++)
{
try {
url = new URL(myURLs[i]);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
imageView.setImageBitmap(bmp);
}
*/
// imageView.setImageURI(Uri.parse(imgStr[position]));
((ViewPager) container).addView(imageView, 0);
return imageView;
}
}
}
我的xml
<RelativeLayout
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:background="@android:color/white"
xmlns:android="http://schemas.android.com/apk/res/android">
<ScrollView
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_below="@+id/lnr"
android:fillViewport="true"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:orientation="vertical"
>
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView android:id="@+id/full_image_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/></LinearLayout>
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:orientation="vertical"
android:background="@drawable/secondpart"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="5dp"
>
<TableLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:shrinkColumns="*" android:stretchColumns="*" >
<TableRow
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:gravity="center_horizontal">
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="Product Name"
android:layout_marginLeft="5dp"
android:textColor="@android:color/black"
/>
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:id="@+id/txtageprofile"
android:textColor="@android:color/black"
android:layout_marginLeft="5dp"
/></TableRow>
<TableRow
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:gravity="center_horizontal"
android:paddingTop="5dp"
>
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="Code"
android:layout_marginLeft="5dp"
android:textColor="@android:color/black"
/>
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:id="@+id/txtheightprofile"
android:textColor="@android:color/black"
android:layout_marginLeft="5dp"
/></TableRow>
<TableRow
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:gravity="center_horizontal"
android:paddingTop="5dp"
>
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="Purchase Rate"
android:layout_marginLeft="5dp"
android:textColor="@android:color/black"
/>
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:id="@+id/txtmrgprofile"
android:textColor="@android:color/black"
android:layout_marginLeft="5dp"
/></TableRow>
<TableRow
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:gravity="center_horizontal"
android:paddingTop="5dp">
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="Weight"
android:layout_marginLeft="5dp"
android:textColor="@android:color/black"
/>
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:id="@+id/txtworkingprofile"
android:textColor="@android:color/black"
android:layout_marginLeft="5dp"
/></TableRow>
<TableRow
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:gravity="center_horizontal"
android:paddingTop="5dp"
>
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="Sales Rate"
android:layout_marginLeft="5dp"
android:textColor="@android:color/black"
/>
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:id="@+id/txtplaceprofile"
android:textColor="@android:color/black"
android:layout_marginLeft="5dp"
/></TableRow>
</TableLayout>
</LinearLayout>
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:orientation="vertical"
android:background="@drawable/secondpart"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="5dp"
>
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_gravity="center_vertical|right"
android:id="@+id/txteatprofile"
android:textColor="@android:color/black"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
/>
</LinearLayout>
</LinearLayout>
</ScrollView>
</RelativeLayout>
推荐答案
USER_IMG.length(); 返回String的长度("的字符数产品图像").您应该返回数据集的大小.改变
USER_IMG.length(); returns the length of the String (the number of chars of "product_images"). You should return the size of the data set instead. Change
@Override
public int getCount() {
return USER_IMG.length();
}
到
@Override
public int getCount() {
if (userImgArrayList == null) {
return 0;
}
return userImgArrayList.size();
}
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