到viewpager的左右导航不起作用

left and right navigation to viewpager not working(到viewpager的左右导航不起作用)

问题描述

我在我的应用程序中使用视图寻呼机，viewpager 工作完美，但我想添加 viewpagerindicator，以下是我的片段代码和 ui 设计的 xml 任何人都可以告诉我有什么问题吗?提前谢谢.............

I am using view pager in my app,viewpager is working perfect but i want to add viewpagerindicator,following is my snippet code and xml of ui design can any one tell me what is issue?thanks in advance.............

 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) {

    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);
      // TitlePageIndicator titleIndicator = (TitlePageIndicator) findViewById(R.id.titles);
      // titleIndicator.setViewPager(viewPager);
       leftss=(ImageView)findViewById(R.id.lefticonsss);
       rightss=(ImageView)findViewById(R.id.righticonsss); 

     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();
     }
leftss.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                viewPager.setCurrentItem(+1,true);
            }
        });
}
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

   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:background="@android:color/black"
android:gravity="center_horizontal"
>



     <ImageView 
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"

   android:src="QGRyYXdhYmxlL2Fycm93"
   android:rotation="180"
    android:id="@+id/lefticonsss"
    />


  <android.support.v4.view.ViewPager
  android:id="@+id/view_pager"
  android:layout_width="150dp"
  android:layout_height="150dp"

   />

    <ImageView android:id="@+id/full_image_view"
    android:layout_width="wrap_content"

    android:layout_height="wrap_content"/>


    <ImageView 
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    android:src="QGRyYXdhYmxlL2Fycm93"

    android:id="@+id/righticonsss"
    />



    </LinearLayout>

推荐答案

我使用这个库 https://github.com/astuetz/PagerSlidingTabStrip

总结:

1. 在你的 onCreate 中执行此操作

1.do this in your onCreate

// Initialize the ViewPager and set an adapter
ViewPager pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(new TestAdapter(getSupportFragmentManager()));

// Bind the tabs to the ViewPager
PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
tabs.setViewPager(pager);

1. (可选)如果您将 OnPageChangeListener 与 ViewPager 一起使用，则应将其设置在 Widget 而不是 ViewPager直接.

1. (Optional) If you use an OnPageChangeListener with your ViewPager you should set it in the Widget rather than on the ViewPager directly.

tabs.setOnPageChangeListener(mPageChangeListener);

这篇关于到viewpager的左右导航不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！