android--多View切换viewpager
网上看到viewpager的多view动画切换，模仿制作了一个 学习到了。
先看效果图：
先看主类的layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#222222" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/textView1"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:background="#999999"
android:gravity="center"
android:text="页面1"
android:textColor="#222222"
/>
<TextView
android:id="@+id/textView2"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:background="#999999"
android:gravity="center"
android:text="页面2"
android:textColor="#222222"
/>
<TextView
android:id="@+id/textView3"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:background="#999999"
android:gravity="center"
android:text="页面3"
android:textColor="#222222"
/>
</LinearLayout>
<ImageView
android:id="@+id/cursor"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scaleType="matrix"
android:src="@drawable/cursor"
android:background="#222222"/>
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
viewPager需要一个pagerAdapter的子类
package com.example.myview;
import java.util.List;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.support.v4.view.ViewPager;
public class MyAdapter extends PagerAdapter{
List<View> viewLists;
public MyAdapter(List<View> lists)
{
viewLists = lists;
}
@Override
public int getCount() { //获得size
// TODO Auto-generated method stub
return viewLists.size();
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0 == arg1;
}
@Override
public void destroyItem(View view, int position, Object object) //销毁Item
{
((ViewPager) view).removeView(viewLists.get(position));
}
@Override
public Object instantiateItem(View view, int position) //实例化Item
{
((ViewPager) view).addView(viewLists.get(position), 0);
return viewLists.get(position);
}
}
最后Main类
package com.example.myview;
import java.util.List;
import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.widget.TextView;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.DisplayMetrics;
import android.graphics.Matrix;
import android.widget.ImageView;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
public class MainActivity extends Activity {
private ViewPager viewPager;
private ImageView imageView;
private List<View> lists = new ArrayList<View>();
private MyAdapter myAdapter;
private Bitmap cursor;
private int offSet;
private int currentItem;
private Matrix matrix = new Matrix();
private int bmWidth;
private Animation animation;
private TextView textView1;
private TextView textView2;
private TextView textView3;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById (R.id.cursor);
textView1 = (TextView) findViewById (R.id.textView1);
textView2 = (TextView) findViewById (R.id.textView2);
textView3 = (TextView) findViewById (R.id.textView3);
lists.add(getLayoutInflater().inflate(R.layout.layout1, null));
lists.add(getLayoutInflater().inflate(R.layout.layout2, null));
lists.add(getLayoutInflater().inflate(R.layout.layout3, null));
initeCursor();
myAdapter = new MyAdapter(lists);
viewPager = (ViewPager) findViewById (R.id.viewPager);
viewPager.setAdapter(myAdapter);
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) { //当滑动式，顶部的imageView是通过animation缓慢的滑动
// TODO Auto-generated method stub
switch (arg0)
{
case 0:
if (currentItem == 1)
{
animation = new TranslateAnimation(
offSet * 2 + bmWidth, 0 , 0, 0);
}
else if(currentItem == 2)
{
animation = new TranslateAnimation(
offSet * 4 + 2 * bmWidth, 0, 0, 0);
}
break;
case 1:
if (currentItem == 0)
{
animation = new TranslateAnimation(
0, offSet * 2 + bmWidth, 0, 0);
}
else if (currentItem == 2)
{
animation = new TranslateAnimation(
4 * offSet + 2 * bmWidth, offSet * 2 + bmWidth, 0, 0);
}
break;
case 2:
if (currentItem == 0)
{
animation = new TranslateAnimation(
0, 4 * offSet + 2 * bmWidth, 0, 0);
}
else if (currentItem == 1)
{
animation = new TranslateAnimation(
offSet * 2 + bmWidth, 4 * offSet + 2 * bmWidth, 0, 0);
}
}
currentItem = arg0;
animation.setDuration(500);
animation.setFillAfter(true);
imageView.startAnimation(animation);
}
@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
}
});
textView1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
viewPager.setCurrentItem(0);
}
});
textView2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
viewPager.setCurrentItem(1);
}
});
textView3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
viewPager.setCurrentItem(2);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
private void initeCursor()
{
cursor = BitmapFactory.decodeResource(getResources(), R.drawable.cursor);
bmWidth = cursor.getWidth();
DisplayMetrics dm;
dm = getResources().getDisplayMetrics();
offSet = (dm.widthPixels - 3 * bmWidth) / 6;
matrix.setTranslate(offSet, 0);
imageView.setImageMatrix(matrix); //需要iamgeView的scaleType为matrix
currentItem = 0;
}
}
类外还有3个layout：layout1，layout2， layout3是最简单，就是定义了不同的背景颜色，这里不给出。
