Android viewpager 以 Android 中的数组大小显示索引中的最后一个值
Android viewpager showing last value in the index in the size of array in Android
我正在从 http 服务器获取数据，我能够显示 json 索引的最后一个值，但是，我无法在 viewpager 中显示我的 json 数组中的所有值.请验证我的代码并给我一个解决方案。
提前致谢
package com.example.vasundharaapp;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.squareup.picasso.Picasso;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
@SuppressWarnings("deprecation")
public class MainActivity extends ActionBarActivity {
static final int NUM_ITEMS = 8;
AdapterTask adapter;
ViewPager viewPager;
ProgressDialog progressDialog;
List<Channels> channelData;
String URl="http://172.17.22.21:925/api/homepage/gethomescroll";
JSONObject json;
JSONArray chanlarray;
String artimage,articaleTitle,articaleSdec,articaldec,aricaleId,articlThumImage;
ImageView anubandam,yuvatharang,beauty,dheera,events,ghumaghumalu,glomer,sweethome,work;
String[] resul;
Timer timer;
int page = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.pager);
anubandam=(ImageView) findViewById(R.id.anubandam);
yuvatharang=(ImageView) findViewById(R.id.Yuva);
beauty=(ImageView) findViewById(R.id.beauty);
dheera=(ImageView) findViewById(R.id.dheera);
events=(ImageView) findViewById(R.id.events);
ghumaghumalu=(ImageView) findViewById(R.id.ghumagumalu);
glomer=(ImageView) findViewById(R.id.glamor);
sweethome=(ImageView) findViewById(R.id.sweet);
work=(ImageView) findViewById(R.id.work);
startProgressDialog();
getChannels();
beauty.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,BeautyActivity.class);
startActivity(i);
}
});
}
private void getChannels() {
new Thread()
{
public void run() {
System.out.println("running");
String responce=SendRequest.GET(URl);
Log.d("responce", responce);
channelData=parseJSON(responce);
Message msg=new Message();
msg.arg1 = 1;
handler.sendMessage(msg);
}
}.start();
}
private List<Channels> parseJSON(String responce) {
// TODO Auto-generated method stub
List<Channels> chanel = new ArrayList<Channels>();
try {
chanlarray = new JSONArray(responce);
for (int i = 0; i < chanlarray.length(); i++) {
JSONObject channelName=chanlarray.getJSONObject(i);
String image = channelName.getString("articlethumbimg");
String title = channelName.getString("articletitle");
String article=channelName.getString("articleshortdec");
//channelData.add(new Channels(image, title,article));
}
} catch (JSONException e1) {
e1.printStackTrace();
}
return chanel;
};
private final Handler handler = new Handler() {
public void handleMessage(Message msg)
{
stopProgressDialog();
adapter = new AdapterTask(chanlarray,MainActivity.this);
viewPager.setAdapter(adapter);
pageSwitcher(4);
}
};
private void startProgressDialog() {
progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Please wait..");
progressDialog.show();
}
private void stopProgressDialog() {
if (progressDialog != null && progressDialog.isShowing())
progressDialog.dismiss();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
}
@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 boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void pageSwitcher(int seconds) {
timer = new Timer(); // At this line a new Thread will be created
timer.scheduleAtFixedRate(new RemindTask(), 0, seconds * 1000); // delay
// in
// milliseconds
}
// this is an inner class...
class RemindTask extends TimerTask {
@Override
public void run() {
// As the TimerTask run on a seprate thread from UI thread we have
// to call runOnUiThread to do work on UI thread.
runOnUiThread(new Runnable() {
public void run() {
if (page > 8) { // In my case the number of pages are 5
viewPager.setCurrentItem(1);
page=1;
} else {
viewPager.setCurrentItem(page++);
}
}
});
}
}
class AdapterTask extends PagerAdapter{
Context context;
String redu[];
JSONArray article;
LayoutInflater inflater;
private List<Channels> articlelist;
AdapterTask(JSONArray article, Context context) {
this.context = context;
this.article = article;
//this.content=content;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return article.length();
}
@Override
public boolean isViewFromObject(View view, Object object) {
// TODO Auto-generated method stub
return view == ((RelativeLayout) object);
}
@Override
public Object instantiateItem(ViewGroup container, final int position) {
ImageView imgflag;
TextView txt,title;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.fashionzone, container,
false);
Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/eenadu.ttf");
imgflag = (ImageView) itemView.findViewById(R.id.flag);
txt=(TextView) itemView.findViewById(R.id.atext);
title=(TextView) itemView.findViewById(R.id.atitle);
for (int j = 0; j < chanlarray.length(); j++) {
try {
JSONObject channelName = chanlarray.getJSONObject(j);
aricaleId=channelName.getString("articleId");
articaleTitle=channelName.getString("articletitle");
articaleSdec=channelName.getString("articleshortdec");
artimage=channelName.getString("articleimage");
articlThumImage=channelName.getString("articlethumbimg");
articaldec=channelName.getString("articledec");
title.setTypeface(tf);
txt.setTypeface(tf);
title.setText(articaleTitle);
txt.setText(articaleSdec);
try{
Picasso.with(MainActivity.this).load(articlThumImage).into(imgflag);
}catch(Exception e)
{
e.printStackTrace();
}
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
((ViewPager) container).addView(itemView);
imgflag.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,DetailsActivity.class);
//Bitmap bmp = flag[position];
i.putExtra("image", artimage);
i.putExtra("txt",articaldec );
startActivity(i);
}
});
txt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,DetailsActivity.class);
//Bitmap bmp = flag[position];
i.putExtra("image", artimage);
i.putExtra("txt",articaldec );
startActivity(i);
}
});
return itemView;
}
@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeView((View) object);
}
}
public class Channels {
private String image;
private String title;
private String desc;
}
}
我强烈建议您避免将 json 解析为 instantiateItem。 Adapter 应该接收 Collection 个项目，通常像数据集一样引用，并从中膨胀视图。这样你就必须付出解析时间，延迟视图的绘制。要解决您的问题，您必须从 instantiateItem 中删除 for 循环。 instantiateItem 被调用 getCount 次，您必须使用参数 position 从 json 中获取要表示的项目。将 for 循环替换为
JSONObject channelName = article.getJSONObject(positon);
我正在从 http 服务器获取数据，我能够显示 json 索引的最后一个值，但是，我无法在 viewpager 中显示我的 json 数组中的所有值.请验证我的代码并给我一个解决方案。 提前致谢
package com.example.vasundharaapp;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.squareup.picasso.Picasso;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
@SuppressWarnings("deprecation")
public class MainActivity extends ActionBarActivity {
static final int NUM_ITEMS = 8;
AdapterTask adapter;
ViewPager viewPager;
ProgressDialog progressDialog;
List<Channels> channelData;
String URl="http://172.17.22.21:925/api/homepage/gethomescroll";
JSONObject json;
JSONArray chanlarray;
String artimage,articaleTitle,articaleSdec,articaldec,aricaleId,articlThumImage;
ImageView anubandam,yuvatharang,beauty,dheera,events,ghumaghumalu,glomer,sweethome,work;
String[] resul;
Timer timer;
int page = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.pager);
anubandam=(ImageView) findViewById(R.id.anubandam);
yuvatharang=(ImageView) findViewById(R.id.Yuva);
beauty=(ImageView) findViewById(R.id.beauty);
dheera=(ImageView) findViewById(R.id.dheera);
events=(ImageView) findViewById(R.id.events);
ghumaghumalu=(ImageView) findViewById(R.id.ghumagumalu);
glomer=(ImageView) findViewById(R.id.glamor);
sweethome=(ImageView) findViewById(R.id.sweet);
work=(ImageView) findViewById(R.id.work);
startProgressDialog();
getChannels();
beauty.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,BeautyActivity.class);
startActivity(i);
}
});
}
private void getChannels() {
new Thread()
{
public void run() {
System.out.println("running");
String responce=SendRequest.GET(URl);
Log.d("responce", responce);
channelData=parseJSON(responce);
Message msg=new Message();
msg.arg1 = 1;
handler.sendMessage(msg);
}
}.start();
}
private List<Channels> parseJSON(String responce) {
// TODO Auto-generated method stub
List<Channels> chanel = new ArrayList<Channels>();
try {
chanlarray = new JSONArray(responce);
for (int i = 0; i < chanlarray.length(); i++) {
JSONObject channelName=chanlarray.getJSONObject(i);
String image = channelName.getString("articlethumbimg");
String title = channelName.getString("articletitle");
String article=channelName.getString("articleshortdec");
//channelData.add(new Channels(image, title,article));
}
} catch (JSONException e1) {
e1.printStackTrace();
}
return chanel;
};
private final Handler handler = new Handler() {
public void handleMessage(Message msg)
{
stopProgressDialog();
adapter = new AdapterTask(chanlarray,MainActivity.this);
viewPager.setAdapter(adapter);
pageSwitcher(4);
}
};
private void startProgressDialog() {
progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Please wait..");
progressDialog.show();
}
private void stopProgressDialog() {
if (progressDialog != null && progressDialog.isShowing())
progressDialog.dismiss();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
}
@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 boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void pageSwitcher(int seconds) {
timer = new Timer(); // At this line a new Thread will be created
timer.scheduleAtFixedRate(new RemindTask(), 0, seconds * 1000); // delay
// in
// milliseconds
}
// this is an inner class...
class RemindTask extends TimerTask {
@Override
public void run() {
// As the TimerTask run on a seprate thread from UI thread we have
// to call runOnUiThread to do work on UI thread.
runOnUiThread(new Runnable() {
public void run() {
if (page > 8) { // In my case the number of pages are 5
viewPager.setCurrentItem(1);
page=1;
} else {
viewPager.setCurrentItem(page++);
}
}
});
}
}
class AdapterTask extends PagerAdapter{
Context context;
String redu[];
JSONArray article;
LayoutInflater inflater;
private List<Channels> articlelist;
AdapterTask(JSONArray article, Context context) {
this.context = context;
this.article = article;
//this.content=content;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return article.length();
}
@Override
public boolean isViewFromObject(View view, Object object) {
// TODO Auto-generated method stub
return view == ((RelativeLayout) object);
}
@Override
public Object instantiateItem(ViewGroup container, final int position) {
ImageView imgflag;
TextView txt,title;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.fashionzone, container,
false);
Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/eenadu.ttf");
imgflag = (ImageView) itemView.findViewById(R.id.flag);
txt=(TextView) itemView.findViewById(R.id.atext);
title=(TextView) itemView.findViewById(R.id.atitle);
for (int j = 0; j < chanlarray.length(); j++) {
try {
JSONObject channelName = chanlarray.getJSONObject(j);
aricaleId=channelName.getString("articleId");
articaleTitle=channelName.getString("articletitle");
articaleSdec=channelName.getString("articleshortdec");
artimage=channelName.getString("articleimage");
articlThumImage=channelName.getString("articlethumbimg");
articaldec=channelName.getString("articledec");
title.setTypeface(tf);
txt.setTypeface(tf);
title.setText(articaleTitle);
txt.setText(articaleSdec);
try{
Picasso.with(MainActivity.this).load(articlThumImage).into(imgflag);
}catch(Exception e)
{
e.printStackTrace();
}
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
((ViewPager) container).addView(itemView);
imgflag.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,DetailsActivity.class);
//Bitmap bmp = flag[position];
i.putExtra("image", artimage);
i.putExtra("txt",articaldec );
startActivity(i);
}
});
txt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,DetailsActivity.class);
//Bitmap bmp = flag[position];
i.putExtra("image", artimage);
i.putExtra("txt",articaldec );
startActivity(i);
}
});
return itemView;
}
@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeView((View) object);
}
}
public class Channels {
private String image;
private String title;
private String desc;
}
}
我强烈建议您避免将 json 解析为 instantiateItem。 Adapter 应该接收 Collection 个项目，通常像数据集一样引用，并从中膨胀视图。这样你就必须付出解析时间，延迟视图的绘制。要解决您的问题，您必须从 instantiateItem 中删除 for 循环。 instantiateItem 被调用 getCount 次，您必须使用参数 position 从 json 中获取要表示的项目。将 for 循环替换为
JSONObject channelName = article.getJSONObject(positon);