Android 将按钮添加到ViewPager中的特定片段
我在安卓SDK中找到了ViewPager,当时正在摆弄它。基本上,我的最后一个任务是创建一个youtube、facebook和twitter提要,并使用ViewPager和片段在三个类别之间滚动。我很难理解这些工作,更具体地说,如何向特定片段添加元素(按钮)?以下是我目前的代码:Android 将按钮添加到ViewPager中的特定片段,android,android-fragments,android-viewpager,android-pageradapter,Android,Android Fragments,Android Viewpager,Android Pageradapter,我在安卓SDK中找到了ViewPager,当时正在摆弄它。基本上,我的最后一个任务是创建一个youtube、facebook和twitter提要,并使用ViewPager和片段在三个类别之间滚动。我很难理解这些工作,更具体地说,如何向特定片段添加元素(按钮)?以下是我目前的代码: package com.ito.mindtrekkers; import java.util.ArrayList; import twitter4j.Query; import twitter4j.QueryRes
package com.ito.mindtrekkers;
import java.util.ArrayList;
import twitter4j.Query;
import twitter4j.QueryResult;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import android.annotation.SuppressLint;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;
import android.widget.Toast;
@SuppressLint("ShowToast")
//Brady Mahar
public class Main extends FragmentActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
ArrayList<String> tweetList = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setCurrentItem(1); //sets initial page to "Facebook"
new DownloadFilesTask().execute("weather" , null, null);
}
@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;
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return getString(R.string.title_youtube);
case 1:
return getString(R.string.title_facebook);
case 2:
return getString(R.string.title_twitter);
}
return null;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
@SuppressLint("ShowToast")
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Create a new TextView and set its text to the fragment's section
// number argument value.
TextView textView = new TextView(getActivity());
textView.setGravity(Gravity.CENTER);
textView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
return textView;
}
}
/**
* Class for handling NetworkOnMainThread
* Sends the command Asynchronously
* @author austinn
*
*/
private class DownloadFilesTask extends AsyncTask<String, Void, String> {
protected String doInBackground(String... command) {
Twitter twitter = new TwitterFactory().getInstance();
Query query = new Query("from:MindTrekkers");
query.setRpp(100);
try {
QueryResult result = twitter.search(query);
for(twitter4j.Tweet tweet : result.getTweets()) {
//Toast.makeText(getApplicationContext(), tweet.getText(), Toast.LENGTH_SHORT);
Log.v("Tweet", tweet.getText());
tweetList.add(tweet.getText());
}
} catch (TwitterException e) {
//Toast.makeText(getApplicationContext(), e + "", Toast.LENGTH_SHORT);
Log.v("Error", e+"");
}
return null;
}
protected void onProgressUpdate(Void... progress) {}
protected void onPostExecute(String result) {}
}
}
package com.ito.mindtrakkers;
导入java.util.ArrayList;
导入twitter4j.Query;
导入twitter4j.QueryResult;
导入twitter4j.Twitter;
导入twitter4j.TwitterException;
导入twitter4j.TwitterFactory;
导入android.annotation.SuppressLint;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.support.v4.app.Fragment;
导入android.support.v4.app.FragmentActivity;
导入android.support.v4.app.FragmentManager;
导入android.support.v4.app.FragmentPagerAdapter;
导入android.support.v4.view.ViewPager;
导入android.util.Log;
导入android.view.Gravity;
导入android.view.LayoutInflater;
导入android.view.Menu;
导入android.view.view;
导入android.view.view.OnClickListener;
导入android.view.ViewGroup;
导入android.view.Window;
导入android.view.WindowManager;
导入android.widget.TextView;
导入android.widget.Toast;
@SuppressLint(“ShowToast”)
//布雷迪·马哈尔
公共类Main扩展了碎片活动{
/**
*将提供的{@link android.support.v4.view.PagerAdapter}
*每个部分的片段。我们使用
*{@link android.support.v4.app.FragmentPagerAdapter}派生,其中
*将所有加载的片段保留在内存中。如果这变得太内存化
*密集型,最好换成
*{@link android.support.v4.app.FragmentStatePagerAdapter}。
*/
分段SPAGERADAPTER mSectionsPagerAdapter;
/**
*将承载节内容的{@link ViewPager}。
*/
ViewPager mViewPager;
ArrayList tweetList=新的ArrayList();
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE\u NO\u TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_全屏,WindowManager.LayoutParams.FLAG_全屏);
setContentView(R.layout.main);
//创建适配器,该适配器将为这三个函数中的每一个返回一个片段
//应用程序的主要部分。
mSectionsPagerAdapter=新节spageradapter(
getSupportFragmentManager());
//使用分区适配器设置ViewPager。
mViewPager=(ViewPager)findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setCurrentItem(1);//将初始页面设置为“Facebook”
新建DownloadFilesTask().execute(“天气”,null,null);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
/**
*一个{@link FragmentPagerAdapter},返回对应于
*其中一个部分/选项卡/页面。
*/
公共类节SpagerAdapter扩展了FragmentPagerAdapter{
公共部分SpagerAdapter(碎片管理器fm){
超级(fm);
}
@凌驾
公共片段getItem(int位置){
//调用getItem来实例化给定页面的片段。
//返回DummySectionFragment(定义为静态内部类
//下面)将页码作为其唯一参数。
Fragment Fragment=新的DummySectionFragment();
Bundle args=新Bundle();
args.putInt(DummySectionFragment.ARG_节号,位置+1);
fragment.setArguments(args);
返回片段;
}
@凌驾
public int getCount(){
//显示共3页。
返回3;
}
@凌驾
公共字符序列getPageTitle(int位置){
开关(位置){
案例0:
返回getString(R.string.title\u youtube);
案例1:
返回getString(R.string.title\u facebook);
案例2:
返回getString(R.string.title\u twitter);
}
返回null;
}
}
/**
*一个虚拟片段,表示应用程序的一部分,但是
*显示虚拟文本。
*/
公共静态类DummySectionFragment扩展了片段{
/**
*表示此文件节号的片段参数
*碎片。
*/
公共静态最终字符串ARG\u SECTION\u NUMBER=“SECTION\u NUMBER”;
公共数据段(){
}
@SuppressLint(“ShowToast”)
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
//创建一个新的TextView并将其文本设置为片段的节
//数字参数值。
TextView TextView=新的TextView(getActivity());
textView.setGravity(Gravity.CENTER);
textView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER));
返回文本视图;
}
}
/**
*用于处理NetworkOnMainThread的类
*异步发送命令
*@作者奥斯汀酒店
*
*/
私有类DownloadFilesTask扩展了AsyncTask{
受保护字符串doInBackground(字符串…命令){
Twitter=new TwitterFactory().getInstance();
查询=新查询(“发件人:MindTrekkers”);
setRpp(100);
试一试{
QueryResult result=twitter.search(查询);
for(twitter4j.Tweet Tweet:result.getTweets()){
public class TestFragmentAdapter extends FragmentPagerAdapter implements IconPagerAdapter {
protected static final String[] CONTENT = new String[] { "CATEGORIAS", "PRINCIPAL", "AS MELHORES", };
protected static final int[] ICONS = new int[] {
R.drawable.perm_group_calendar,
R.drawable.perm_group_camera,
R.drawable.perm_group_device_alarms,
};
private int mCount = CONTENT.length;
public TestFragmentAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {Fragment f = null;
switch(position){
case 0:
{
f = new ArrayListFragment();//YourFragment
// set arguments here, if required
Bundle args = new Bundle();
f.setArguments(args);
break;
}
case 1:
{
f = new HomeFragment();//YourFragment
// set arguments here, if required
Bundle args = new Bundle();
f.setArguments(args);
break;
}
case 2:
{
f = new EndlessCustomView();//YourFragment
// set arguments here, if required
Bundle args = new Bundle();
f.setArguments(args);
break;
}
default:
throw new IllegalArgumentException("not this many fragments: " + position);
}
return f;
}
@Override
public int getCount() {
return mCount;
}
@Override
public CharSequence getPageTitle(int position) {
return TestFragmentAdapter.CONTENT[position % CONTENT.length];
}
@Override
public int getIconResId(int index) {
return ICONS[index % ICONS.length];
}
public void setCount(int count) {
if (count > 0 && count <= 10) {
mCount = count;
notifyDataSetChanged();
}
}
}
public class FaceBookFragment extends Fragment {
private static FaceBookFragment instance = null;
public static FaceBookFragment newInstance() {
if(instance == null) {
instance = new FaceBookFragment();
Bundle args = new Bundle();
instance.setArguments(args);
return instance;
}
return instance;
}
public FaceBookFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_facebook, container,
false);
...
return rootView;
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Fragment frag = null;
switch (position) {
case 0:
frag = FaceBookFragment.newInstance();
break;
case 1:
frag = TwitterFragment.newInstance();
break;
case 2:
frag = YouTubeFragment.newInstance();
break;
}
return frag;
}
}
public class MainActivity extends ActionBarActivity implements ActionBar.TabListener {
ArrayList<String> tweetList = new ArrayList<String>();
...
public ArrayList<String> getTweetlist() {
return tweetlist;
}
...
}
public class TwitterFragment extends Fragment {
...
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_twitter, container, false);
...
ArrayList<String> tweetList = ((MainActivity)getActivity()).getTweetlist();
...
return rootView;
}
...
}