如何从服务器上获取ViewPager上的图像 [英] How to fetch images on ViewPager from server
本文介绍了如何从服务器上获取ViewPager上的图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想为图像实现一个应用程序，该图像显示图像将来自服务器端，并且假设服务器上只有一两个图像，则最多将有四个图像，然后传呼机将显示额外的页面或滑块，例如该图像.
I want to implement one app for image showing where images will come from server side and there will be maximum 4 images suppose that there are only one or two image on server then the pager will shown extra page or slider like this image.
public class BlankActivity extends FragmentActivity implements View.OnClickListener{
public static final String KEY_PIC = "pic";
public static final String KEY_PIC1 = "pic1";
public static final String KEY_PIC2 = "pic2";
public static final String KEY_PIC3 = "pic3";
public static final String JSON_ARRAY = "result";
String url1="https://www.maangal.com/photos/large_";
public String pic0="";
public String pic1="";
public String pic2="";
public String pic3="";
public String p0="";
public String p1="";
public String p2="";
public String p3="";
private ArrayList<String> ImagesArray = new ArrayList<>();
CustomTextView context;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_blank);
mPager = (ViewPager) findViewById(R.id.pager);
getData();
用于滑块调用初始化功能.
for slider call init function.
private void init( String p0,String p1,String p2,String p3) {
this.p0 = p0;
this.p1 = p1;
this.p2 = p2;
this.p3 = p3;
String[] IMAGES={p0,p1,p2,p3};
for(int i=0;i<IMAGES.length;i++) {
ImagesArray.add(IMAGES[i]);
if (p0.equalsIgnoreCase("https://www.maangal.com/photos/large_"))
{ Log.e("pic**********", url1 + IMAGES[i]);
mPager.setVisibility(View.GONE);
}
else Log.e("pic_______________", url1 + IMAGES[i]);
}
mPager = (ViewPager) findViewById(R.id.pager);
mPager.setAdapter(new SlidingImage_Adapter(BlankActivity.this,ImagesArray));
CirclePageIndicator indicator = (CirclePageIndicator) findViewById(R.id.indicator);
indicator.setViewPager(mPager);
final float density = getResources().getDisplayMetrics().density;
//Set circle indicator radius
indicator.setRadius(5 * density);
NUM_PAGES = IMAGES.length;
indicator.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
currentPage = position;
}
@Override
public void onPageScrolled(int pos, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int pos) {
}
});
}
getData函数，我在其中使用Volley响应从服务器获取图像
getData function where I used Volley response to fetch the images from server
private void getData() {
tv21.setText(getIntent().getExtras().getString("id"));
id = tv21.getText().toString().trim();
Bundle extras = getIntent().getExtras();
if (extras != null) {
id = extras.getString("ID");
strGender = extras.getString("gender");
} else {
// handle case
}
String detailsURL ="https://www.maangal.com/maangal_mobile/details2.php?id="+id+"&gender="+strGender+"&curr_user_id="+current_Id;
StringRequest stringRequest = new StringRequest(Request.Method.POST,detailsURL, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
showJSON(response);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(BlankActivity.this,error.getMessage().toString(),Toast.LENGTH_LONG).show();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(BlankActivity.this);
requestQueue.add(stringRequest);
}
private void showJSON(String response){
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray result = jsonObject.getJSONArray(Config.JSON_ARRAY);
JSONObject userData = result.getJSONObject(0);
pic0 = userData.getString(KEY_PIC);
pic1 = userData.getString(KEY_PIC1);
pic2 = userData.getString(KEY_PIC2);
pic3 = userData.getString(KEY_PIC3);
init(url1+pic0,url1+pic1,url1+pic2,url1+pic3);
}
SlidingImage_Adapter寻呼机适配器
SlidingImage_Adapter pager adapter
public class SlidingImage_Adapter extends PagerAdapter {
private ArrayList<String> IMAGES;
private LayoutInflater layoutInflater;
private Context context;
ProgressBar progressBar;
private ImageLoader imageLoader;
SessionManager session;
public String str_gender;
public SlidingImage_Adapter(Context context, ArrayList<String> IMAGES) {
this.context = context;
this.IMAGES=IMAGES;
for(int i=0;i<IMAGES.size();i++)
layoutInflater = LayoutInflater.from(context);
}
@Override
public Object instantiateItem(ViewGroup view, int position) {
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View item_view = layoutInflater.inflate(R.layout.screen_slide_fragment, view, false);
ImageView imageView = (ImageView) item_view.findViewById(R.id.image);
progressBar=(ProgressBar)item_view.findViewById(R.id.progressBar);
// Session class instance
session = new SessionManager(context);
// get user data from session
HashMap<String, String> user = session.getUserDetails();
str_gender = user.get(SessionManager.KEY_GENDER);
if(str_gender.equalsIgnoreCase("Female")){
Picasso.with(context)
.load(IMAGES.get(position))
.error(R.drawable.girl)
.placeholder(R.drawable.girl)
.fit()
.into(imageView);
view.addView(item_view);
}
else{
Picasso.with(context)
.load(IMAGES.get(position))
.error(R.drawable.boy)
.placeholder(R.drawable.boy)
.into(imageView);
view.addView(item_view);
}
return item_view;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public int getCount() {
return IMAGES.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view.equals(object);
}
@Override
public void restoreState(Parcelable state, ClassLoader loader) {
}
@Override
public Parcelable saveState(){
return null;
}
}
推荐答案
您需要检查其他URL是否为空白，则无需添加到图像数组中.使用下面的代码更改代码，然后检查.
You need to check if other URLs are blank then you don't need to add into Array of Image. Change your code with below code and check.
String[] IMAGES={p0,p1,p2,p3};
for(int i=0;i<IMAGES.length;i++) {
if(!IMAGES[i].isEmpty()) {
ImagesArray.add(IMAGES[i]);
}
if (p0.equalsIgnoreCase("https://www.maangal.com/photos/large_"))
{
Log.e("pic**********", url1 + IMAGES[i]);
mPager.setVisibility(View.GONE);
}
}
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