ViewFlipper和GestrueDetector 共同实现滑屏效果

关于GestureDetector的相关知识,在上一节已经介绍过了,不懂的大家可以去了解一下。

1.main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/bg"
    android:orientation="vertical" >

    <ViewFlipper
        android:id="@+id/viewFlipper1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:persistentDrawingCache="animation"  
       android:flipInterval="1000"  
       android:inAnimation="@anim/push_left_in"  
       android:outAnimation="@anim/push_left_out"  
        >
        <include android:id="@+id/lay1" layout="@layout/layout1"/>
        <include android:id="@+id/lay2" layout="@layout/layout2"/>
    </ViewFlipper>

</LinearLayout>

注:layout1和layout2 布局很简单,就是有一个textview和一个button,就不在这里写出了。其中包含了两个特效xml文件,放在res/anim下,

1.push_left_in

<?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="0.0"    
   android:toAlpha="1.0"  
    android:duration="500" />   
</set>   

2 push_left_out

<?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="0.0"    
    android:duration="500" />   
</set>  


主类:

package com.wj.gesture;

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.OnDoubleTapListener;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ViewFlipper;

public class GestureDetectorTest extends Activity implements OnClickListener, OnTouchListener,OnGestureListener,OnDoubleTapListener{
    GestureDetector gestureDetector;
    private Button next = null,up  = null;
    private ViewFlipper flipper = null;
    private static final int FLING_MIN_DISTANCE = 100;
    private static final int FLING_MIN_VELOCITY = 200;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        initview();
        setListener();
    }
    
    private void initview(){
        gestureDetector = new GestureDetector(this);
        next = (Button)this.findViewById(R.id.button1);
        up = (Button)this.findViewById(R.id.button2);
        next.setOnClickListener(this);
        up.setOnClickListener(this);
        flipper   = (ViewFlipper)this.findViewById(R.id.viewFlipper1);
        flipper.setLongClickable(true);
    }
    
    private void setListener(){
        flipper.setOnTouchListener(this);
    }
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        //Toast.makeText(this, "ontouch", 1000).show();
        return gestureDetector.onTouchEvent(event);
    }

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

    @Override
    public void onShowPress(MotionEvent e) {
        // TODO Auto-generated method stub
        
    }

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

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
            float distanceY) {

        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        if (e1.getX()-e2.getX()>FLING_MIN_DISTANCE&&Math.abs(velocityX)>FLING_MIN_VELOCITY) {
            flipper.setInAnimation(inFromRightAnimation());
            flipper.setOutAnimation(outToLeftAnimation());
            flipper.showNext();
        }else if (e2.getX()-e1.getX()>FLING_MIN_DISTANCE&&Math.abs(velocityX) > FLING_MIN_VELOCITY) {
            flipper.setInAnimation(inFromLeftAnimation());
            flipper.setOutAnimation(outToRightAnimation());
            flipper.showPrevious();
        }
        return false;
    }

    protected Animation inFromRightAnimation() {
        Animation inFromRight = new TranslateAnimation(
                Animation.RELATIVE_TO_PARENT, +1.0f,
                Animation.RELATIVE_TO_PARENT, 0.0f,
                Animation.RELATIVE_TO_PARENT, 0.0f,
                Animation.RELATIVE_TO_PARENT, 0.0f);
        inFromRight.setDuration(500);
        inFromRight.setInterpolator(new AccelerateInterpolator());
        return inFromRight;
    }

    protected Animation outToLeftAnimation() {
        Animation outtoLeft = new TranslateAnimation(
                Animation.RELATIVE_TO_PARENT, 0.0f,
                Animation.RELATIVE_TO_PARENT, -1.0f,
                Animation.RELATIVE_TO_PARENT, 0.0f,
                Animation.RELATIVE_TO_PARENT, 0.0f);
        outtoLeft.setDuration(500);
        outtoLeft.setInterpolator(new AccelerateInterpolator());
        return outtoLeft;
    }

    protected Animation inFromLeftAnimation() {
        Animation inFromLeft = new TranslateAnimation(
                Animation.RELATIVE_TO_PARENT, -1.0f,
                Animation.RELATIVE_TO_PARENT, 0.0f,
                Animation.RELATIVE_TO_PARENT, 0.0f,
                Animation.RELATIVE_TO_PARENT, 0.0f);
        inFromLeft.setDuration(500);
        inFromLeft.setInterpolator(new AccelerateInterpolator());
        return inFromLeft;
    }

    protected Animation outToRightAnimation() {
        Animation outtoRight = new TranslateAnimation(
                Animation.RELATIVE_TO_PARENT, 0.0f,
                Animation.RELATIVE_TO_PARENT, +1.0f,
                Animation.RELATIVE_TO_PARENT, 0.0f,
                Animation.RELATIVE_TO_PARENT, 0.0f);
        outtoRight.setDuration(500);
        outtoRight.setInterpolator(new AccelerateInterpolator());
        return outtoRight;
    }
    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        // TODO Auto-generated method stub
        return false;
    }

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

    @Override
    public boolean onDoubleTapEvent(MotionEvent e) {
        // TODO Auto-generated method stub
        return false;
    }
    @Override
    public void onClick(View v) {
        if (v==next) {
            flipper.showNext();
        }else{
            flipper.showPrevious();
        }
    }
}

你可能感兴趣的:(android,velocity,layout,animation,button,encoding)