Java Volley可以在WIFI上工作,但不能在3G上工作
如果问题太长,我先道歉。我们开始: 有两个活动:Java Volley可以在WIFI上工作,但不能在3G上工作,java,android,android-activity,gridview,android-volley,Java,Android,Android Activity,Gridview,Android Volley,如果问题太长,我先道歉。我们开始: 有两个活动:Main和Detail活动 主要活动基本上是一个网格视图。 详细信息活动基本上是显示单击项目的详细信息。我正在将所选项目的id(pid)从Main传递到Detail活动 我面临的问题如下。最初,我有3G连接(手机连接),点击第一个项目,在详细信息活动中看到相应的项目详细信息,效果非常好,然后返回到主要活动,然后点击第二个项目,不幸的是,它仍然显示了我最初单击的DetailActivity中的第一项 当应用程序处于活动和打开状态时,我从3g切换到wi
Main
和Detail
活动
主要活动
基本上是一个网格视图。
详细信息活动
基本上是显示单击项目的详细信息。我正在将所选项目的id(pid
)从Main
传递到Detail
活动
我面临的问题如下。最初,我有3G
连接(手机连接),点击第一个项目,在详细信息活动中看到相应的项目详细信息,效果非常好,然后返回到主要活动
,然后点击第二个项目,不幸的是,它仍然显示了我最初单击的DetailActivity
中的第一项
当应用程序处于活动和打开状态时,我从3g
切换到wifi
。无论单击什么,它都会显示我最初单击的第一个项目
但是,当我删除并重新安装应用程序,并获得wifi
accessonly时,应用程序运行得非常好
在以下实现中,连接URL(产品详细信息URL)是http
,而不是https
。我正在使用Volley
库进行网络连接
DetailActivity.java
private void productDetailInit() {
// it is http
StringRequest postRequest = new StringRequest(Request.Method.POST, Config.PRODUCT_DETAIL_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
jsonObject = response;
loadJsonData();
} catch (Exception e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
}
) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<>();
params.put("id", productID);
return params;
}
};
RetryPolicy policy = new DefaultRetryPolicy(1000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
postRequest.setRetryPolicy(policy);
CustomVolleyRequest.getInstance(this).getRequestQueue().add(postRequest);
}
private void productDetailInit(){
//它是http
StringRequest postRequest=新的StringRequest(Request.Method.POST,Config.PRODUCT\u DETAIL\u URL,
新的Response.Listener(){
@凌驾
公共void onResponse(字符串响应){
试一试{
jsonObject=响应;
loadJsonData();
}捕获(例外e){
e、 printStackTrace();
}
}
},
新的Response.ErrorListener(){
@凌驾
公共无效onErrorResponse(截击错误){
错误。printStackTrace();
}
}
) {
@凌驾
受保护的映射getParams(){
Map params=新的HashMap();
参数put(“id”,productID);
返回参数;
}
};
RetryPolicy policy=新的DefaultRetryPolicy(1000,DefaultRetryPolicy.DEFAULT\u MAX\u RETRIES,DefaultRetryPolicy.DEFAULT\u BACKOFF\u MULT);
postRequest.setRetryPolicy(策略);
CustomVolleyRequest.getInstance(this).getRequestQueue().add(postRequest);
}
CustomVolleyRequest.java
public class CustomVolleyRequest {
private static CustomVolleyRequest customVolleyRequest;
private static Context context;
private RequestQueue requestQueue;
private ImageLoader imageLoader;
private CustomVolleyRequest(Context context) {
this.context = context;
this.requestQueue = getRequestQueue();
imageLoader = new ImageLoader(requestQueue,
new ImageLoader.ImageCache() {
private final LruCache<String, Bitmap>
cache = new LruCache<String, Bitmap>(20);
@Override
public Bitmap getBitmap(String url) {
return cache.get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
cache.put(url, bitmap);
}
});
}
private class BitmapCache implements ImageLoader.ImageCache {
private LruCache<String, Bitmap> mCache;
public BitmapCache() {
mCache = new LruCache<>(20);
}
@Override
public Bitmap getBitmap(String url) {
return mCache.get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
// scaling bitmap for avoiding too much big images
Bitmap scaled = ImageUtil.getInstance().scaleBitmap(bitmap);
mCache.put(url, scaled);
}
}
public static synchronized CustomVolleyRequest getInstance(Context context) {
if (customVolleyRequest == null) {
customVolleyRequest = new CustomVolleyRequest(context);
}
return customVolleyRequest;
}
public RequestQueue getRequestQueue() {
if (requestQueue == null) {
Cache cache = new DiskBasedCache(context.getCacheDir(), 10 * 1024 * 1024);
Network network = new BasicNetwork(new HurlStack());
requestQueue = new RequestQueue(cache, network);
requestQueue.start();
}
return requestQueue;
}
public ImageLoader getImageLoader() {
return imageLoader;
}
}
class ProductMainAdapter extends ArrayAdapter<ImageRecord> {
private ImageLoader mImageLoader;
private String jsonObject;
ProductMainAdapter(Context context) {
super(context, R.layout.grid_item);
mImageLoader = CustomVolleyRequest.getInstance(this.getContext()).getImageLoader();
}
@NonNull
@Override
public View getView(final int position, View convertView, @NonNull ViewGroup parent) {
final ViewHolder holder;
if(convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(getContext()).inflate(R.layout.grid_item, parent, false);
convertView.setBackgroundResource(R.drawable.round_gridview);
holder.priceTagImage = (ImageView) convertView.findViewById(R.id.priceTag_IV);
holder.textView = (TextView) convertView.findViewById(R.id.text);
holder.imageView = (NetworkImageView) convertView.findViewById(R.id.picture);
holder.priceTagRL = (RelativeLayout) convertView.findViewById(R.id.priceTag_RL);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
ImageRecord imageRecord = getItem(position);
holder.imageView.setImageUrl(imageRecord != null ? imageRecord.getUrl() : null, mImageLoader);
holder.imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
openProductDetail(position);
}
});
holder.textView.setText(imageRecord != null ? imageRecord.getTitle() : null);
holder.priceTagRL.setRotation(0);
return convertView;
}
private class ViewHolder{
TextView textView;
ImageView priceTagImage;
NetworkImageView imageView;
RelativeLayout priceTagRL;
}
private void openProductDetail(int position) {
try {
ImageRecord imr = getItem(position);
String productID = imr != null ? imr.getId() : "0";
Intent intent = new Intent(getContext(), ProductDetailActivity.class);
intent.putExtra("pid", productID);
getContext().startActivity(intent);
} catch (Exception e) {
Log.e("openProductDetail", "exception", e);
}
}
公共类CustomVolleyRequest{
私有静态CustomVolleyRequest CustomVolleyRequest;
私有静态语境;
私有请求队列请求队列;
私有图像加载器;
私有CustomVolleyRequest(上下文){
this.context=上下文;
this.requestQueue=getRequestQueue();
imageLoader=新的imageLoader(请求队列,
新建ImageLoader.ImageCache(){
私人决赛
缓存=新的LruCache(20);
@凌驾
公共位图getBitmap(字符串url){
返回cache.get(url);
}
@凌驾
公共位图(字符串url、位图){
cache.put(url、位图);
}
});
}
私有类BitmapCache实现ImageLoader.ImageCache{
私人LruCache-mCache;
公共位图缓存(){
mCache=新的LruCache(20);
}
@凌驾
公共位图getBitmap(字符串url){
返回mCache.get(url);
}
@凌驾
公共位图(字符串url、位图){
//缩放位图以避免过多的大图像
位图缩放=ImageUtil.getInstance().scaleBitmap(位图);
mCache.put(url,缩放);
}
}
公共静态同步CustomVolleyRequest getInstance(上下文){
if(customVolleyRequest==null){
customVolleyRequest=新customVolleyRequest(上下文);
}
返回客户截击请求;
}
公共请求队列getRequestQueue(){
if(requestQueue==null){
Cache Cache=new DiskBasedCache(context.getCacheDir(),10*1024*1024);
网络=新的基本网络(new HurlStack());
requestQueue=新的requestQueue(缓存、网络);
requestQueue.start();
}
返回请求队列;
}
公共ImageLoader getImageLoader(){
返回图像加载器;
}
}
Adapter.java
public class CustomVolleyRequest {
private static CustomVolleyRequest customVolleyRequest;
private static Context context;
private RequestQueue requestQueue;
private ImageLoader imageLoader;
private CustomVolleyRequest(Context context) {
this.context = context;
this.requestQueue = getRequestQueue();
imageLoader = new ImageLoader(requestQueue,
new ImageLoader.ImageCache() {
private final LruCache<String, Bitmap>
cache = new LruCache<String, Bitmap>(20);
@Override
public Bitmap getBitmap(String url) {
return cache.get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
cache.put(url, bitmap);
}
});
}
private class BitmapCache implements ImageLoader.ImageCache {
private LruCache<String, Bitmap> mCache;
public BitmapCache() {
mCache = new LruCache<>(20);
}
@Override
public Bitmap getBitmap(String url) {
return mCache.get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
// scaling bitmap for avoiding too much big images
Bitmap scaled = ImageUtil.getInstance().scaleBitmap(bitmap);
mCache.put(url, scaled);
}
}
public static synchronized CustomVolleyRequest getInstance(Context context) {
if (customVolleyRequest == null) {
customVolleyRequest = new CustomVolleyRequest(context);
}
return customVolleyRequest;
}
public RequestQueue getRequestQueue() {
if (requestQueue == null) {
Cache cache = new DiskBasedCache(context.getCacheDir(), 10 * 1024 * 1024);
Network network = new BasicNetwork(new HurlStack());
requestQueue = new RequestQueue(cache, network);
requestQueue.start();
}
return requestQueue;
}
public ImageLoader getImageLoader() {
return imageLoader;
}
}
class ProductMainAdapter extends ArrayAdapter<ImageRecord> {
private ImageLoader mImageLoader;
private String jsonObject;
ProductMainAdapter(Context context) {
super(context, R.layout.grid_item);
mImageLoader = CustomVolleyRequest.getInstance(this.getContext()).getImageLoader();
}
@NonNull
@Override
public View getView(final int position, View convertView, @NonNull ViewGroup parent) {
final ViewHolder holder;
if(convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(getContext()).inflate(R.layout.grid_item, parent, false);
convertView.setBackgroundResource(R.drawable.round_gridview);
holder.priceTagImage = (ImageView) convertView.findViewById(R.id.priceTag_IV);
holder.textView = (TextView) convertView.findViewById(R.id.text);
holder.imageView = (NetworkImageView) convertView.findViewById(R.id.picture);
holder.priceTagRL = (RelativeLayout) convertView.findViewById(R.id.priceTag_RL);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
ImageRecord imageRecord = getItem(position);
holder.imageView.setImageUrl(imageRecord != null ? imageRecord.getUrl() : null, mImageLoader);
holder.imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
openProductDetail(position);
}
});
holder.textView.setText(imageRecord != null ? imageRecord.getTitle() : null);
holder.priceTagRL.setRotation(0);
return convertView;
}
private class ViewHolder{
TextView textView;
ImageView priceTagImage;
NetworkImageView imageView;
RelativeLayout priceTagRL;
}
private void openProductDetail(int position) {
try {
ImageRecord imr = getItem(position);
String productID = imr != null ? imr.getId() : "0";
Intent intent = new Intent(getContext(), ProductDetailActivity.class);
intent.putExtra("pid", productID);
getContext().startActivity(intent);
} catch (Exception e) {
Log.e("openProductDetail", "exception", e);
}
}
class ProductMainAdapter扩展了ArrayAdapter{
私有图像加载器;
私有字符串jsonObject;
ProductMainAdapter(上下文){
超级(上下文、右布局、网格项);
mImageLoader=CustomVolleyRequest.getInstance(this.getContext()).getImageLoader();
}
@非空
@凌驾
公共视图getView(最终整型位置,视图转换视图,@NonNull视图组父级){
最终持票人;
if(convertView==null){
holder=新的ViewHolder();
convertView=LayoutInflater.from(getContext()).flate(R.layout.grid_项,父项,false);
convertView.setBackgroundResource(R.drawable.round_gridview);
holder.priceTagImage=(ImageView)convertView.findViewById(R.id.priceTag_IV);
holder.textView=(textView)convertView.findViewById(R.id.text);
holder.imageView=(NetworkImageView)convertView.findViewById(R.id.picture);
holder.priceTagRL=(RelativeLayout)convertView.findViewById(R.id.priceTag_RL);
convertView.setTag(支架);
}
否则{
holder=(ViewHolder)convertView.getTag();
}
成像仪
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
//do your logic based on the position
}
});