Loading data in SwipeRefreshLayout with help of Baseadapter
https://stackoverflow.com//questions/25033574
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21-12-2019 - |
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07-30 09:20:22.401: E/AndroidRuntime(1748): FATAL EXCEPTION: main
07-30 09:20:22.401: E/AndroidRuntime(1748): java.lang.NullPointerException
07-30 09:20:22.401: E/AndroidRuntime(1748): at com.example.swiperefreshdemoprac.adapter.DemoAdapter.getView(DemoAdapter.java:78)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.widget.AbsListView.obtainView(AbsListView.java:2143)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.widget.ListView.makeAndAddView(ListView.java:1831)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.widget.ListView.fillSpecific(ListView.java:1320)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.widget.ListView.layoutChildren(ListView.java:1630)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.widget.AbsListView.onLayout(AbsListView.java:1994)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.View.layout(View.java:14008)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.ViewGroup.layout(ViewGroup.java:4373)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:324)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.View.layout(View.java:14008)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.ViewGroup.layout(ViewGroup.java:4373)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.View.layout(View.java:14008)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.ViewGroup.layout(ViewGroup.java:4373)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1663)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1521)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.View.layout(View.java:14008)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.ViewGroup.layout(ViewGroup.java:4373)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.View.layout(View.java:14008)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.ViewGroup.layout(ViewGroup.java:4373)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1892)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1711)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.Choreographer.doFrame(Choreographer.java:532)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.os.Handler.handleCallback(Handler.java:725)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.os.Handler.dispatchMessage(Handler.java:92)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.os.Looper.loop(Looper.java:137)
07-30 09:20:22.401: E/AndroidRuntime(1748): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-30 09:20:22.401: E/AndroidRuntime(1748): at java.lang.reflect.Method.invokeNative(Native Method)
07-30 09:20:22.401: E/AndroidRuntime(1748): at java.lang.reflect.Method.invoke(Method.java:511)
07-30 09:20:22.401: E/AndroidRuntime(1748): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-30 09:20:22.401: E/AndroidRuntime(1748): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-30 09:20:22.401: E/AndroidRuntime(1748): at dalvik.system.NativeStart.main(Native Method)
07-30 09:22:37.049: E/Trace(1806): error opening trace file: No such file or directory (2)
What I am doing in I am loading some data in SwipeRefreshLayout with the help of BaseAdapter. Complete code is as follows.
This is the main activity class.
MainActivity.java
package com.example.swiperefreshdemoprac.activity;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import com.example.swiperefreshdemoprac.R;
import com.example.swiperefreshdemoprac.adapter.DemoAdapter;
import com.example.swiperefreshdemoprac.gettersetter.GetterSetter;
import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseFile;
import com.parse.ParseObject;
import com.parse.ParseQuery;
public class MainActivity extends Activity implements OnItemClickListener,OnRefreshListener{
private SwipeRefreshLayout swipeRefreshLayout;
Bitmap VideoThumbImage = null;
ListView VideolistView;
DemoAdapter adapter;
ArrayList<GetterSetter> newArray = new ArrayList<GetterSetter>();
ArrayList<GetterSetter> newArray2 = new ArrayList<GetterSetter>();
public List<ParseObject> objectTest;
int initialnum = 0;
int finalnum = 5;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main);
swipeRefreshLayout = new SwipeRefreshLayout(MainActivity.this);
setContentView(swipeRefreshLayout);
VideolistView = new ListView(MainActivity.this);
ParseQuery<ParseObject> newQuery = ParseQuery.getQuery("Videos");
newQuery.whereExists("url");
newQuery.addDescendingOrder("number");
newQuery.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(List<ParseObject> list, ParseException e) {
// TODO Auto-generated method stub
if (e == null) {
int dataSize = list.size();
for (int i = initialnum; i < finalnum; i++) {
ParseFile Youtubeimage = (ParseFile) list.get(i).get(
"VideoImage");
byte[] imageconvert;
try {
imageconvert = Youtubeimage.getData();
VideoThumbImage = BitmapFactory.decodeByteArray(
imageconvert, 0, imageconvert.length);
} catch (ParseException ee) {
ee.printStackTrace();
}
String Title = (String) list.get(i).get("Title");
String urlYou = (String) list.get(i).get("url");
GetterSetter setItNow = new GetterSetter();
setItNow.setImage(VideoThumbImage);
setItNow.setTitle(Title);
setItNow.setUrl(urlYou);
newArray.add(setItNow);
}
adapter = new DemoAdapter(getApplicationContext(),
newArray);
VideolistView.setAdapter(adapter);
VideolistView.setOnItemClickListener(MainActivity.this);
objectTest = list;
initialnum = finalnum;
if((list.size()-finalnum)>5){
finalnum = finalnum+5;
} else {
finalnum = list.size() - finalnum;
}
} else {
e.printStackTrace();
}
}
});
Log.d("THis is ", "7");
Log.d("This is Testing", "Testing");
// Log.d("The size is", "This is the size :- "+objectTest.size());
swipeRefreshLayout.addView(VideolistView);
swipeRefreshLayout.setOnRefreshListener(this);
}
@Override
public void onRefresh() {
// TODO Auto-generated method stub
new Thread(){
public void run() {
SystemClock.sleep(2000);
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this,"This is the object Length :- "+objectTest.size() +", This is the ini :- "+initialnum+", This si the final num" + finalnum, Toast.LENGTH_SHORT).show();
for (int i = initialnum; i < finalnum; i++) {
ParseFile Youtubeimage = (ParseFile) objectTest.get(i).get(
"VideoImage");
byte[] imageconvert;
try {
imageconvert = Youtubeimage.getData();
VideoThumbImage = BitmapFactory.decodeByteArray(
imageconvert, 0, imageconvert.length);
} catch (ParseException ee) {
ee.printStackTrace();
}
String Title = (String) objectTest.get(i).get("Title");
String urlYou = (String) objectTest.get(i).get("url");
GetterSetter setItNow2 = new GetterSetter();
setItNow2.setImage(VideoThumbImage);
setItNow2.setTitle(Title);
setItNow2.setUrl(urlYou);
newArray2.add(setItNow2);
}
Toast.makeText(MainActivity.this, "This is the size of the new Array :- " + newArray.size(), Toast.LENGTH_SHORT).show();
adapter.DemoAdapter2(MainActivity.this, newArray2);
// adapter.notifyDataSetChanged();
// adapter.notifyDataSetChanged();
swipeRefreshLayout.setRefreshing(false);
// VideolistView.setAdapter(adapter);
}
});
};
}.start();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
}
}
This is the Adapter class
DemoAdapter.java
package com.example.swiperefreshdemoprac.adapter;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.os.Binder;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.example.swiperefreshdemoprac.R;
import com.example.swiperefreshdemoprac.gettersetter.GetterSetter;
import com.parse.RefreshCallback;
public class DemoAdapter extends BaseAdapter{
Context cont;
ArrayList<GetterSetter> refrehsetter;
ArrayList<GetterSetter> refrehsetter2;
LayoutInflater inflate;
public DemoAdapter(Context cont,ArrayList<GetterSetter> refrehsetter){
this.cont = cont;
this.refrehsetter = refrehsetter;
}
public void DemoAdapter2(Context cont,ArrayList<GetterSetter> newrefrehsetter) {
// TODO Auto-generated constructor stub
this.cont = cont;
refrehsetter2 = newrefrehsetter;
this.refrehsetter.addAll(refrehsetter2);
notifyDataSetChanged();
Toast.makeText(cont, "This is the size after call :- "+refrehsetter2.size(), Toast.LENGTH_SHORT).show();
// refrehsetter.addAll(refrehsetter2);
// notifyDataSetChanged();
}
public class Holder{
ImageView image;
TextView url, Title;
}
@Override
public View getView(int position, View ConvertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder hold = null;
inflate = (LayoutInflater) cont.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if(ConvertView == null){
ConvertView = inflate.inflate(R.layout.layout_trailer_item, null);
hold = new Holder();
hold.image = (ImageView) ConvertView.findViewById(R.id.imageView1);
hold.Title = (TextView) ConvertView.findViewById(R.id.textView1);
hold.url = (TextView) ConvertView.findViewById(R.id.urlID);
Toast.makeText(cont,"This is not the result", Toast.LENGTH_SHORT).show();
} else {
hold = (Holder) ConvertView.getTag();
Toast.makeText(cont,"<<<<<This is the result>>>>>", Toast.LENGTH_SHORT).show();
}
GetterSetter getset = (GetterSetter) getItem(position);
hold.image.setImageBitmap(getset.getImage());
hold.Title.setText(getset.getTitle());
hold.url.setText(getset.getUrl());
return ConvertView;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return refrehsetter.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return refrehsetter.get(arg0);
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return refrehsetter.indexOf(getItem(arg0));
}
}
This Below is the Getter Setter.
GetterSetter.java
package com.example.swiperefreshdemoprac.gettersetter;
import android.graphics.Bitmap;
public class GetterSetter {
String url;
Bitmap image;
String title;
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public Bitmap getImage() {
return image;
}
public void setImage(Bitmap image) {
this.image = image;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
Here I am trying to load the data on refresh but when I swipe to refresh It is not loading the new data that I have got. Can anyone please tell me where am I going wrong.
المحلول
Hey all there was the error in handling the adapter tag. I wan not setting the Tag and also I was not setting the layout inflator in the proper place. Let me post the Adapter class.
package com.example.swiperefreshdemoprac.adapter;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.example.swiperefreshdemoprac.R;
import com.example.swiperefreshdemoprac.gettersetter.GetterSetter;
public class DemoAdapter extends BaseAdapter{
Context cont;
ArrayList<GetterSetter> refrehsetter;
LayoutInflater inflate;
public DemoAdapter(Context cont,ArrayList<GetterSetter> refrehsetter){
this.cont = cont;
this.refrehsetter = refrehsetter;
inflate = (LayoutInflater) cont.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
}
public void updateNewArray(ArrayList<GetterSetter> setit){
// refrehsetter.clear();
refrehsetter.addAll(setit);
notifyDataSetChanged();
}
public class Holder{
ImageView image;
TextView url, Title;
}
@Override
public View getView(int position, View ConvertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder hold;
View view = ConvertView;
if(ConvertView == null){
view = inflate.inflate(R.layout.layout_trailer_item, null);
hold = new Holder();
hold.image = (ImageView) view.findViewById(R.id.imageView1);
hold.Title = (TextView) view.findViewById(R.id.textView1);
hold.url = (TextView) view.findViewById(R.id.urlID);
view.setTag(hold);
Toast.makeText(cont,"This is not the result", Toast.LENGTH_SHORT).show();
} else {
hold = (Holder) ConvertView.getTag();
Toast.makeText(cont,"<<<<<This is the result>>>>>", Toast.LENGTH_SHORT).show();
}
GetterSetter getset = (GetterSetter) getItem(position);
hold.image.setImageBitmap(getset.getImage());
hold.Title.setText(getset.getTitle());
hold.url.setText(getset.getUrl());
return view;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return refrehsetter.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return refrehsetter.get(arg0);
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return refrehsetter.indexOf(getItem(arg0));
}
}
نصائح أخرى
Are you getting more data ? or you're getting updated data ?
If you're "refreshing" your list, then you shouldn't add the new list to your old list, you should just set your data source in the adapter to be the new refreshed list.
If you're getting more data, addAll() method will cause new data to be added at the bottom of your list.
لا تنتمي إلى StackOverflow
