亚洲乱码卡一卡二卡三永久-亚洲乱码一二三四区-亚洲乱码一区二区三区在线观看-亚洲伦理一区-成人在色线视频在线观看免费大全-成人在线91

顯示效果：



實(shí)現(xiàn)過程：
1.創(chuàng)建3個(gè)選項(xiàng)卡中的內(nèi)容，即三個(gè)Fragment。
這里僅貼出其中一個(gè)：
Tab2：

package com.example.viewpagerdemo3;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

public class Tab2 extends Fragment
{
    private Button but = null;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.tab2,null);//注意不要指定父視圖
        but = (Button) view.findViewById(R.id.but);
        return view;
    }
    @Override
    public void onActivityCreated(Bundle savedInstanceState)
    {
        super.onActivityCreated(savedInstanceState);
        but.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Toast.makeText(Tab2.this.getActivity(),"hahah", 0).show();
            }
        });
    }
}

布局：

剩下兩個(gè)Fragment類似。
2.主界面布局

三個(gè)TextView代表選項(xiàng)卡標(biāo)題，ImageView代表選項(xiàng)卡下的下劃線。
3.實(shí)現(xiàn)activity。

package com.example.viewpagerdemo3;

import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.Matrix;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.DisplayMetrics;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends FragmentActivity
{
    private ViewPager vPager = null;
    /**
     * 代表選項(xiàng)卡下的下劃線的imageview
     */
    private ImageView cursor = null;
    /**
     * 選項(xiàng)卡下劃線長(zhǎng)度
     */
    private static int lineWidth = 0;
    
    /**
     * 偏移量
     *         （手機(jī)屏幕寬度/3-選項(xiàng)卡長(zhǎng)度）/2
     */
    private static int offset = 0;
    
    /**
     * 選項(xiàng)卡總數(shù)
     */
    private static final int TAB_COUNT = 3;
    /**
     * 當(dāng)前顯示的選項(xiàng)卡位置
     */
    private int current_index = 0;
    
    /**
     * 選項(xiàng)卡標(biāo)題
     */
    private TextView text1,text2,text3;
    
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        vPager = (ViewPager) findViewById(R.id.vPager);
        
        initImageView();
        text1 = (TextView) findViewById(R.id.text1);
        text2 = (TextView) findViewById(R.id.text2);
        text3 = (TextView) findViewById(R.id.text3);
        final TextView[] titles = {text1,text2,text3};
        vPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager())
        {
            @Override
            public int getCount()
            {
                return TAB_COUNT;
            }
            
            @Override
            public Fragment getItem(int index)//直接創(chuàng)建fragment對(duì)象并返回
            {
                switch (index)
                {
                case 0:
                    return new Tab1();
                case 1:
                    return new Tab2();
                case 2:
                    return new Tab3();
                }
                return null;
            }
        });
        vPager.setOnPageChangeListener(new OnPageChangeListener()
        {
            int one = offset * 2 + lineWidth;// 頁(yè)卡1 -> 頁(yè)卡2 偏移量
            @Override
            public void onPageSelected(int index)//設(shè)置標(biāo)題的顏sè以及下劃線的移動(dòng)效果
            {
                Animation animation = new TranslateAnimation(one*current_index,one*index, 0,0);
                animation.setFillAfter(true);
                animation.setDuration(300);
                cursor.startAnimation(animation);
                titles[current_index].setTextColor(Color.BLACK);
                titles[index].setTextColor(Color.RED);
                current_index = index;
            }
            
            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2)
            {
            }
            
            @Override
            public void onPageScrollStateChanged(int index)
            {
            }
        });
    }
    private void initImageView()
    {
        cursor = (ImageView) findViewById(R.id.cursor);
        //獲取圖片寬度
        lineWidth = BitmapFactory.decodeResource(getResources(),R.drawable.line).getWidth();
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        //獲取屏幕寬度
        int screenWidth = dm.widthPixels;
        Matrix matrix = new Matrix();
        offset = (int) ((screenWidth/(float)TAB_COUNT - lineWidth)/2);
        matrix.postTranslate(offset, 0);
        //設(shè)置初始位置
        cursor.setImageMatrix(matrix);
    }
}