ViewFlipper的简单用法

ViewFlipper和ViewPager挺像的，都是一个view容器。内部可以添加多个view，只是viewpager可以通过左右滑动来切换view，而viewFlipper则没有这个功能，所以需要在它上面监听手势。比较方便的是它不用使用适配器就能添加view，所以比较方便。

首先在布局文件中定义这个控件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ffffff">
    
    <ViewFlipper android:id="@+id/ViewFlipper01"
        android:layout_width="match_parent" 
        android:layout_height="match_parent"/>
    
</LinearLayout>

2.在代码中找到并且添加view

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        detector = new GestureDetector(this);
        flipper = (ViewFlipper) this.findViewById(R.id.ViewFlipper01);

        flipper.addView(addTextView("page 1"));//添加view到flipper中，这里添加5个textView
        flipper.addView(addTextView("page 2"));
        flipper.addView(addTextView("page 3"));
        flipper.addView(addTextView("page 4"));
        flipper.addView(addTextView("page 5"));
    }


/**
     * @param text
     * @return 一个textView对象
     */
    private View addTextView(String text) {
        TextView tv = new TextView(this);
        tv.setText(text);
        tv.setTextSize(40);
        tv.setTextColor(0xff000000);
        tv.setGravity(Gravity.CENTER);
        return tv;
    }

3.通过touch监听手势来切换view

@Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        if (e1.getX() - e2.getX() > 120) {
            this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in));
            this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));
            this.flipper.showNext();//切换到下一个view
            return true;
        } else if (e1.getX() - e2.getX() < -120) {
            this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_in));
            this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_out));
            this.flipper.showPrevious();
            return true;
        }
        return false;
    }

下面是Activity的完整代码：

package com.xu81.testflip;

import android.app.Activity;
import android.app.ActivityManager.RecentTaskInfo;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.GestureDetector.OnGestureListener;
import android.view.animation.AnimationUtils;
import android.widget.TextView;
import android.widget.ViewFlipper;

public class TestFlip extends Activity implements OnGestureListener {

    private ViewFlipper flipper;

    private GestureDetector detector;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        detector = new GestureDetector(this);
        flipper = (ViewFlipper) this.findViewById(R.id.ViewFlipper01);

        flipper.addView(addTextView("page 1"));//添加view到flipper中，这里添加5个textView
        flipper.addView(addTextView("page 2"));
        flipper.addView(addTextView("page 3"));
        flipper.addView(addTextView("page 4"));
        flipper.addView(addTextView("page 5"));
    }

    /**
     * @param text
     * @return 一个textView对象
     */
    private View addTextView(String text) {
        TextView tv = new TextView(this);
        tv.setText(text);
        tv.setTextSize(40);
        tv.setTextColor(0xff000000);
        tv.setGravity(Gravity.CENTER);
        return tv;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return this.detector.onTouchEvent(event);
    }

    @Override
    public boolean onDown(MotionEvent e) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        if (e1.getX() - e2.getX() > 120) {
            this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in));
            this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));
            this.flipper.showNext();//切换到下一个view
            return true;
        } else if (e1.getX() - e2.getX() < -120) {
            this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_in));
            this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_out));
            this.flipper.showPrevious();
            return true;
        }
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {
        // TODO 自动生成的方法存根
        
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
            float distanceY) {
        // TODO 自动生成的方法存根
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {
        // TODO 自动生成的方法存根
        
    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        // TODO 自动生成的方法存根
        return false;
    }


}

动画文件：

push_left_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="100%p" android:toXDelta="0"
        android:duration="500" />
    <alpha android:fromAlpha="0.1" android:toAlpha="1.0"
        android:duration="500" />
</set>

push_left_out.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="0" android:toXDelta="-100%p"
        android:duration="500" />
    <alpha android:fromAlpha="1.0" android:toAlpha="0.1"
        android:duration="500" />
</set>

push_right_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="-100%p" android:toXDelta="0"
        android:duration="500" />
    <alpha android:fromAlpha="0.1" android:toAlpha="1.0"
        android:duration="500" />
</set>

push_right_out.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="0" android:toXDelta="100%p"
        android:duration="500" />
    <alpha android:fromAlpha="1.0" android:toAlpha="0.1"
        android:duration="500" />
</set>