實現效果
本實例主要實現用ViewPage和Fragment實現選項卡切換效果，選項卡個數為3個，點擊選項卡或滑動屏幕會切換Fragment並實現選項卡下方下邊框條跟隨移動效果。
本程序用android4.2.2真機調試，為方便部署，我使用adbWireless做為部署工具，電腦和手機接入同一局域網，在PC端輸入名稱 adb connect 手機端ip 默認連接5555端口。之后再Eclipse的Devices中即可看到介入設備。前提是android系統需要Root。如下圖：
設計實現
- 創建項目（此過程不做贅述）
- 在activity_main.xml中設置布局。xml內容如下：
<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"
tools:context="com.example.fengzhengapp.MainActivity" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:orientation="horizontal" >
<TextView
android:id="@+id/tv_hot"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1.0"
android:background="#ffEAEAEA"
android:gravity="center"
android:text="@string/tab_hot"
android:textSize="18sp" />
<TextView
android:id="@+id/tv_news"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1.0"
android:background="#ffEAEAEA"
android:gravity="center"
android:text="@string/tab_news"
android:textSize="18sp" />
<TextView
android:id="@+id/tv_fav"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1.0"
android:background="#ffEAEAEA"
android:gravity="center"
android:text="@string/tab_favorite"
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/bgborder" />
<android.support.v4.view.ViewPager
android:id="@+id/myViewPager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:flipInterval="30" >
</android.support.v4.view.ViewPager>
</LinearLayout>
上面布局頁實現的效果如下：
- 接下來，增加3個Fragment布局頁 ，分別在里面填充簡單的內容
第一個：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/txtHot"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="this is the hot tab" >
</TextView>
</LinearLayout>
第二個：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/txtNews"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="this is the news tab" >
</TextView>
</LinearLayout>
第三個:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/txtFav"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="this is the Fav tab" >
</TextView>
</LinearLayout>
以上3個Fragment的布局文件已創建完畢，每個文件中只顯示簡單的文本內容，用做演示。
- 加載3個Fragment到Activity中。
首先實現3個Fragment對應的后台類
熱點布局頁對應的類：
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentHot extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragmenthot, container, false);
return view;
}
}
news布局頁對應的類：
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentNews extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragmentnews, container, false);
return view;
}
}
收藏布局頁對應的類：
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentFavorite extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragmentfav, container, false);
return view;
}
}
- 之后再activity中初始化這3個Fragment
注意要點：
Activity繼承自FragmentActivity
要實現一個FragmentPagerAdapter，內容如下：
import java.util.ArrayList;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class MyFragmentAdapter extends FragmentPagerAdapter {
ArrayList<Fragment> list;
public MyFragmentAdapter(FragmentManager fm,ArrayList<Fragment> list){
super(fm);
this.list = list;
}
@Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
return list.get(arg0);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
}
然后在Activity中實現切換和動畫效果，代碼如下：
import java.util.ArrayList;
import android.app.Activity;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.support.v4.app.FragmentActivity;
import android.view.MenuItem;
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 mViewPager;
private ArrayList fragments;
private TextView view1, view2, view3;
private int currIndex;
private ImageView image;
private static int bmpW;//橫線圖片寬度
private static int offset;//圖片移動的偏移量
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViewPager();
InitTextView();
InitImage();
}
@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);
}
private void InitTextView(){
view1 = (TextView) findViewById(R.id.tv_hot);
view2 = (TextView) findViewById(R.id.tv_news);
view3 = (TextView) findViewById(R.id.tv_fav);
view1.setOnClickListener(new txtListener(0));
view2.setOnClickListener(new txtListener(1));
view3.setOnClickListener(new txtListener(2));
}
//內部類 重寫TextView點擊事件
public class txtListener implements View.OnClickListener{
private int index = 0;
public txtListener(int i){
index = i;
}
@Override
public void onClick(View v){
mViewPager.setCurrentItem(index);
}
}
/*
* 初始化圖片的位移像素
*/
public void InitImage(){
image = (ImageView)findViewById(R.id.cursor);
bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.bgborder).getWidth();
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int screenW = dm.widthPixels;
offset = (screenW/3 - bmpW)/2;
Log.i("screenW",String.valueOf(screenW));
Log.i("bmpW",String.valueOf(bmpW));
Log.i("offset",String.valueOf(offset));
//imgageview設置平移，使下划線平移到初始位置（平移一個offset）
Matrix matrix = new Matrix();
matrix.postTranslate(offset, 0);
image.setImageMatrix(matrix);
}
private void initViewPager(){
mViewPager = (ViewPager)findViewById(R.id.myViewPager);
fragments = new ArrayList<Fragment>();
Fragment fragmentHot = new FragmentHot();
Fragment fragmentNews = new FragmentNews();
Fragment fragmentFav = new FragmentFavorite();
fragments.add(fragmentHot);
fragments.add(fragmentNews);
fragments.add(fragmentFav);
mViewPager.setAdapter(new MyFragmentAdapter(getSupportFragmentManager(), fragments));
mViewPager.setCurrentItem(0);
mViewPager.setOnPageChangeListener(new myOnPageChangeListener());
}
public class myOnPageChangeListener implements OnPageChangeListener {
private int one = offset*2 +bmpW;//兩個相鄰頁面的偏移量
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
Log.i("aaaaaaaaaaaaa",String.valueOf(arg0));
Log.i("one",String.valueOf(one));
Animation animation = new TranslateAnimation(currIndex*one,arg0*one,0,0);//平移動畫
currIndex = arg0;
animation.setFillAfter(true);//動畫終止時停留在最后一幀，不然會回到沒有執行前的狀態
animation.setDuration(200);//動畫持續時間0.2秒
image.startAnimation(animation);//是用ImageView來顯示動畫的
//int i = currIndex + 1;
// Toast.makeText(MainActivity.this, "您選擇了第"+i+"個頁卡", Toast.LENGTH_SHORT).show();
}
}
}
源代碼地址請訪問這里：源碼