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android listview的HeadView左右切换图片(仿新浪,网易,百度等切换图片)

2013年12月09日 ⁄ 综合 ⁄ 共 8771字 ⁄ 字号 评论关闭

首先我们还是看一些示例:(网易,新浪,百度)

1352275904_8547.jpg

  1352275926_5218.jpg  1352275946_5983.jpg
显示效果都不错,可是手感就不一样了,百度最棒,网易还行,新浪就操作很不好,这里我说的是滑动切换图片.自己可以测试一下.不得不说牛叉的公司确实有哦牛叉的道理.

下面我简单的介绍下实现方法:其实就是listview addHeaderView.只不过这个view是一个可以切换图片的view,至于这个view怎么做,就要根据自己的喜爱了,实现有多种方法,下面我简单介绍一下.

第一种:ViewFlipper+GestureDetector

主布局就是一个listview,这里就不介绍了,我介绍下切换图片布局head_iamge.xml

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<span style="font-size:12px;"><?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">
 
    <FrameLayout
        android:id="@+id/fl_main"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
 
        <ViewFlipper
            android:id="@+id/ViewFlipper01"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent">
        </ViewFlipper>
 
        <LinearLayout
            android:id="@+id/ll_point"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|center_horizontal"
            android:layout_marginBottom="10dp"
            android:src="@drawable/indicator"/>
    </FrameLayout>
 
</LinearLayout></span>

这里我就添加一系列切换点,至于显示新闻标题,透明效果等等,大家可以自己布局,方法同理,不难实现.

接下来我们看动画布局.

push_left_in.xml

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<span style="font-size:12px;"><?xml version="1.0"encoding="utf-8"?>
    android:fillAfter="true">
 
    <translate
        android:duration="500"
        android:fromXDelta="-100%p"
        android:toXDelta="0"/>
 
    <alpha
        android:duration="500"
        android:fromAlpha="0.1"
        android:toAlpha="1.0"/>
 
</set></span>

push_left_out.xml

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<span style="font-size:12px;"><?xml version="1.0"encoding="utf-8"?>
 
    <translate
        android:duration="500"
        android:fromXDelta="0"
        android:toXDelta="-100%p"/>
 
    <alpha
        android:duration="500"
        android:fromAlpha="1.0"
        android:toAlpha="0.5"/>
 
</set></span>

push_right_in.xml

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<span style="font-size:12px;"><?xml version="1.0"encoding="utf-8"?>
    android:fillAfter="true">
 
    <translate
        android:duration="500"
        android:fromXDelta="100%p"
        android:toXDelta="0"/>
 
    <alpha
        android:duration="500"
        android:fromAlpha="0.1"
        android:toAlpha="1.0"/>
 
</set></span>

push_right_out.xml

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<span style="font-size:12px;"><?xml version="1.0"encoding="utf-8"?>
 
    <translate
        android:duration="500"
        android:fromXDelta="0"
        android:toXDelta="100%p"/>
 
    <alpha
        android:duration="500"
        android:fromAlpha="1.0"
        android:toAlpha="0.5"/>
 
</set></span>

我简单介绍下这些布局:

push_left_in:左边进入,则要进入的view初始位置在-100%p位置,终止位置在0,而push_left_out:左边出来,则此时view的位置在0,而终止位置在-100%p.

右进右出同理,至于alpha渐变,很简单,动画就说道这里,相信了解动画的同学们不用看就ok了.

下面重点是如何实现.

代码:

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<span style="font-size:12px;">packagecom.jj.chage2;
 
import
java.util.ArrayList;
import
java.util.Timer;
import
java.util.TimerTask;
 
import
android.app.Activity;
import
android.content.Context;
import
android.graphics.Bitmap;
import
android.graphics.BitmapFactory;
import
android.graphics.Matrix;
import
android.os.Bundle;
import
android.util.Log;
import
android.view.GestureDetector;
import
android.view.LayoutInflater;
import
android.view.MotionEvent;
import
android.view.View;
import
android.view.ViewGroup;
import
android.view.View.OnTouchListener;
import
android.view.animation.AnimationUtils;
import
android.widget.AdapterView;
import
android.widget.AdapterView.OnItemClickListener;
import
android.widget.Button;
import
android.widget.ImageView.ScaleType;
import
android.widget.LinearLayout.LayoutParams;
import
android.widget.ArrayAdapter;
import
android.widget.FrameLayout;
import
android.widget.ImageView;
import
android.widget.LinearLayout;
import
android.widget.ListView;
import
android.widget.TextView;
import
android.widget.Toast;
import
android.widget.ViewFlipper;
 
public
class
MainActivity extendsActivity
implements
        GestureDetector.OnGestureListener {
    privateGestureDetector detector;
    privateViewFlipper flipper;
    privateint
image_id[] = { R.drawable.a, R.drawable.b, R.drawable.c };
    privateListView lv_main;
    privateLayoutInflater layoutInflater;
    privateLinearLayout ll_point;
    privateFrameLayout frameLayout;
    privatefinal
String msg[] = {"one",
"two","three",
"four", "five",
            "six","seven"
};
    privateint
frameheight;// 图片的高度
    privateint
window_width;// 屏幕宽度
    privateArrayList<ImageView> imageViews;// ponit 集合
    privateArrayList<View> views;// flipper的孩子
    privateTimer timer;
 
    /***
     * 初始化 point
     */
    voidinitPoint() {
        imageViews =new
ArrayList<ImageView>();
        ImageView imageView;
        for(int
i = 0; i < image_id.length; i++) {
            imageView =new
ImageView(this);
            imageView.setBackgroundResource(R.drawable.indicator);
            LinearLayout.LayoutParams layoutParams =new
LinearLayout.LayoutParams(
                    newViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
                            LayoutParams.WRAP_CONTENT));
            layoutParams.leftMargin =10;
            layoutParams.rightMargin =10;
            ll_point.addView(imageView, layoutParams);
            imageViews.add(imageView);
        }
 
    }
 
    /***
     * ChildView
     */
    voidinitChildView(ViewFlipper flipper) {
        views =new
ArrayList<View>();
        LayoutParams layoutParams =new
LayoutParams(LayoutParams.FILL_PARENT,
                LayoutParams.FILL_PARENT);
        for(int
i = 0; i < image_id.length; i++) {
            ImageView imageView =new
ImageView(this);
            imageView.setScaleType(ScaleType.FIT_XY);
            Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
                    image_id[i]);
            Bitmap bitmap2 = getBitmap(bitmap, window_width);
            frameheight = bitmap2.getHeight();// 获取要显示的高度
            imageView.setImageResource(image_id[i]);
            flipper.addView(imageView, layoutParams);
            views.add(imageView);
        }
        initPoint();
    }
 
    /***
     * 初始化 HeadImage
     */
    voidinitHeadImage() {
        layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View headview = layoutInflater.inflate(R.layout.head_image,null);
 
        flipper = (ViewFlipper) headview.findViewById(R.id.ViewFlipper01);
 
        ll_point = (LinearLayout) headview.findViewById(R.id.ll_point);
        frameLayout = (FrameLayout) headview.findViewById(R.id.fl_main);
        initChildView(flipper);
 
        LayoutParams layoutParams = (LayoutParams) frameLayout
                .getLayoutParams();
        layoutParams.height = frameheight;
        frameLayout.setLayoutParams(layoutParams);
        draw_Point(0);// 默认首次进入
        lv_main.addHeaderView(headview);// 要卸载setAdapter前面
        lv_main.setAdapter(newArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, msg));
 
    }
 
    /***
     * init view
     */
    voidinitView() {
        setTitle("jjhappyforever...");
        setContentView(R.layout.main);
        lv_main = (ListView) findViewById(R.id.lv_main);
        lv_main.setOnItemClickListener(newOnItemClickListener() {
 
            @Override
            publicvoid
onItemClick(AdapterView<?> parent, View view,
                    intposition,
long id) {
 
                if(position !=
0)
                    Toast.makeText(MainActivity.this, msg[position -1],
1)
                            .show();
                else{
                    intindex = getPageIndex(flipper.getCurrentView());
                    Toast.makeText(MainActivity.this,"图"
+ index, 1).show();
 
                }
 
            }
        });
        initHeadImage();
    }
 
    /***
     * 更新选中点
     *
     * @param index
     */
    privatevoid
draw_Point(intindex) {
        for(int
i = 0

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