ViewPager + Fragment实现滑动标签页
ViewPager 结合Fragment实现一个Activity里包含多个可滑动的标签页,每个标签页可以有独立的布局及响应。
activity_main.xml
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://schemas.android.com/tools"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:orientation="vertical">
- <LinearLayout
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:orientation="horizontal">
- <TextView
- android:id="@+id/tv_guid1"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_weight="1.0"
- android:gravity="center"
- android:text="特性1"
- android:textSize="18sp"/>
- <TextView
- android:id="@+id/tv_guid2"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_weight="1.0"
- android:gravity="center"
- android:text="特性2"
- android:textSize="18sp"/>
- <TextView
- android:id="@+id/tv_guid3"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_weight="1.0"
- android:gravity="center"
- android:text="特性3 "
- android:textSize="18sp"/>
- <TextView
- android:id="@+id/tv_guid4"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_weight="1.0"
- android:gravity="center"
- android:text="特性4"
- android:textSize="18sp"/>
- </LinearLayout>
- <ImageView
- android:id="@+id/cursor"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:scaleType="matrix"
- android:src="@drawable/cursor"/>
- <android.support.v4.view.ViewPager
- android:id="@+id/viewpager"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:flipInterval="30"
- android:persistentDrawingCache="animation"/>
- </LinearLayout>
MainActivity.java
- package com.example.viewpagernfragment;
- import java.util.ArrayList;
- import android.graphics.BitmapFactory;
- import android.graphics.Matrix;
- import android.os.Bundle;
- import android.support.v4.app.Fragment;
- import android.support.v4.app.FragmentActivity;
- import android.support.v4.view.ViewPager;
- import android.support.v4.view.ViewPager.OnPageChangeListener;
- import android.util.DisplayMetrics;
- import android.view.Menu;
- import android.view.View;
- import android.view.animation.Animation;
- import android.view.animation.TranslateAnimation;
- import android.widget.ImageView;
- import android.widget.TextView;
- import android.widget.Toast;
- public class MainActivity extends FragmentActivity {
- private ViewPager mPager;
- private ArrayList<Fragment> fragmentList;
- private ImageView image;
- private TextView view1, view2, view3, view4;
- private int currIndex;//当前页卡编号
- private int bmpW;//横线图片宽度
- private int offset;//图片移动的偏移量
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- InitTextView();
- InitImage();
- InitViewPager();
- }
- /*
- * 初始化标签名
- */
- public void InitTextView(){
- view1 = (TextView)findViewById(R.id.tv_guid1);
- view2 = (TextView)findViewById(R.id.tv_guid2);
- view3 = (TextView)findViewById(R.id.tv_guid3);
- view4 = (TextView)findViewById(R.id.tv_guid4);
- view1.setOnClickListener(new txListener(0));
- view2.setOnClickListener(new txListener(1));
- view3.setOnClickListener(new txListener(2));
- view4.setOnClickListener(new txListener(3));
- }
- public class txListener implements View.OnClickListener{
- private int index=0;
- public txListener(int i) {
- index =i;
- }
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- mPager.setCurrentItem(index);
- }
- }
- /*
- * 初始化图片的位移像素
- */
- public void InitImage(){
- image = (ImageView)findViewById(R.id.cursor);
- bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.cursor).getWidth();
- DisplayMetrics dm = new DisplayMetrics();
- getWindowManager().getDefaultDisplay().getMetrics(dm);
- int screenW = dm.widthPixels;
- offset = (screenW/4 - bmpW)/2;
- //imgageview设置平移,使下划线平移到初始位置(平移一个offset)
- Matrix matrix = new Matrix();
- matrix.postTranslate(offset, 0);
- image.setImageMatrix(matrix);
- }
- /*
- * 初始化ViewPager
- */
- public void InitViewPager(){
- mPager = (ViewPager)findViewById(R.id.viewpager);
- fragmentList = new ArrayList<Fragment>();
- Fragment btFragment= new ButtonFragment();
- Fragment secondFragment = TestFragment.newInstance("this is second fragment");
- Fragment thirdFragment = TestFragment.newInstance("this is third fragment");
- Fragment fourthFragment = TestFragment.newInstance("this is fourth fragment");
- fragmentList.add(btFragment);
- fragmentList.add(secondFragment);
- fragmentList.add(thirdFragment);
- fragmentList.add(fourthFragment);
- //给ViewPager设置适配器
- mPager.setAdapter(new MyFragmentPagerAdapter(getSupportFragmentManager(), fragmentList));
- mPager.setCurrentItem(0);//设置当前显示标签页为第一页
- mPager.setOnPageChangeListener(new MyOnPageChangeListener());//页面变化时的监听器
- }
- public class MyOnPageChangeListener implements OnPageChangeListener{
- private int one = offset *2 +bmpW;//两个相邻页面的偏移量
- @Override
- public void onPageScrolled(int arg0, float arg1, int arg2) {
- // TODO Auto-generated method stub
- }
- @Override
- public void onPageScrollStateChanged(int arg0) {
- // TODO Auto-generated method stub
- }
- @Override
- public void onPageSelected(int arg0) {
- // TODO Auto-generated method stub
- Animation animation = new TranslateAnimation(currIndex*one,arg0*one,0,0);//平移动画
- currIndex = arg0;
- animation.setFillAfter(true);//动画终止时停留在最后一帧,不然会回到没有执行前的状态
- animation.setDuration(200);//动画持续时间0.2秒
- image.startAnimation(animation);//是用ImageView来显示动画的
- int i = currIndex + 1;
- Toast.makeText(MainActivity.this, "您选择了第"+i+"个页卡", Toast.LENGTH_SHORT).show();
- }
- }
- @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;
- }
- }
谷歌官方认为,ViewPager应该和Fragment一起使用时,此时ViewPager的适配器是FragmentPagerAdapter,当你实现一个FragmentPagerAdapter,你必须至少覆盖以下方法:
getCount()
getItem()
如果ViewPager没有和Fragment一起,ViewPager的适配器是PagerAdapter,它是基类提供适配器来填充页面ViewPager内部,当你实现一个PagerAdapter,你必须至少覆盖以下方法:
- package com.example.viewpagernfragment;
- import java.util.ArrayList;
- import android.support.v4.app.Fragment;
- import android.support.v4.app.FragmentManager;
- import android.support.v4.app.FragmentPagerAdapter;
- public class MyFragmentPagerAdapter extends FragmentPagerAdapter{
- ArrayList<Fragment> list;
- public MyFragmentPagerAdapter(FragmentManager fm,ArrayList<Fragment> list) {
- super(fm);
- this.list = list;
- }
- @Override
- public int getCount() {
- return list.size();
- }
- @Override
- public Fragment getItem(int arg0) {
- return list.get(arg0);
- }
- }
- package com.example.viewpagernfragment;
- import android.os.Bundle;
- import android.support.v4.app.Fragment;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.Button;
- import android.widget.Toast;
- public class ButtonFragment extends Fragment{
- Button myButton;
- @Override
- public View onCreateView(LayoutInflater inflater, ViewGroup container,
- Bundle savedInstanceState) {
- View rootView = inflater.inflate(R.layout.guide_1, container, false);//关联布局文件
- myButton = (Button)rootView.findViewById(R.id.mybutton);//根据rootView找到button
- //设置按键监听事件
- myButton.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- Toast.makeText(ButtonFragment.this.getActivity(), "button is click!", Toast.LENGTH_SHORT).show();
- }
- });
- return rootView;
- }
- }
- package com.example.viewpagernfragment;
- import android.os.Bundle;
- import android.support.v4.app.Fragment;
- import android.util.Log;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.TextView;
- public class TestFragment extends Fragment {
- private static final String TAG = "TestFragment";
- private String hello;// = "hello android";
- private String defaultHello = "default value";
- static TestFragment newInstance(String s) {
- TestFragment newFragment = new TestFragment();
- Bundle bundle = new Bundle();
- bundle.putString("hello", s);
- newFragment.setArguments(bundle);
- //bundle还可以在每个标签里传送数据
- return newFragment;
- }
- @Override
- public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
- Log.d(TAG, "TestFragment-----onCreateView");
- Bundle args = getArguments();
- hello = args != null ? args.getString("hello") : defaultHello;
- View view = inflater.inflate(R.layout.guide_2, container, false);
- TextView viewhello = (TextView) view.findViewById(R.id.tv);
- viewhello.setText(hello);
- return view;
- }
- }
- <?xml version="1.0" encoding="UTF-8"?>
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:background="#ff0000ff" >
- <Button
- android:id="@+id/mybutton"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="hit me"
- android:gravity="center"/>
- </RelativeLayout>
- <?xml version="1.0" encoding="utf-8"?>
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical"
- android:background="#158684" >
- <TextView
- android:id="@+id/tv"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="TextView" />
- </RelativeLayout>