Android用悬浮按钮实现翻页效果

Posted brave-sailor

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今天给大家分享下自己用悬浮按钮点击实现翻页效果的例子。技术分享

首先，一个按钮要实现悬浮，就要用到系统顶级窗口相关的WindowManager，WindowManager.LayoutParams。那么在androidManifest.xml中添加权限：

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<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

然后，我们要对WindowManager，WindowManager.LayoutParams的相关属性进行下设置：

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private WindowManager wm=null;
private WindowManager.LayoutParams wmParams=null;
 
private void initFloatView(){
    //获取WindowManager
    wm=(WindowManager)getApplicationContext().getSystemService("window");
    //设置LayoutParams(全局变量）相关参数
     wmParams = new WindowManager.LayoutParams();
         
    wmParams.type=LayoutParams.TYPE_PHONE;   //设置window type
    wmParams.format=PixelFormat.RGBA_8888;   //设置图片格式，效果为背景透明
     //设置Window flag
    wmParams.flags=LayoutParams.FLAG_NOT_TOUCH_MODAL
                     | LayoutParams.FLAG_NOT_FOCUSABLE;
 
    //以屏幕左上角为原点，设置x、y初始值
     wmParams.x=0;
    wmParams.y=0;
    //设置悬浮窗口长宽数据
     wmParams.width=50;
    wmParams.height=50;
}

通过WindowManager的addView方法创建的View可以实现悬浮窗口效果！因此，我们需要为屏幕创建2个悬浮按钮了。

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    /**
    * 创建左边悬浮按钮
    */
    private void createLeftFloatView(){
        leftbtn=new ImageView(this);
        leftbtn.setImageResource(R.drawable.prev);
        leftbtn.setAlpha(0);
        leftbtn.setOnClickListener(new View.OnClickListener() {
        public void onClick(View arg0) {
            //上一篇
        }
    });
        //调整悬浮窗口
        wmParams.gravity=Gravity.LEFT|Gravity.CENTER_VERTICAL;
        //显示myFloatView图像
        wm.addView(leftbtn, wmParams);
    }
    /**
    * 创建右边悬浮按钮
    */
    private void createRightFloatView(){
        rightbtn=new ImageView(this);
        rightbtn.setImageResource(R.drawable.next);
        rightbtn.setAlpha(0);
        rightbtn.setOnClickListener(new View.OnClickListener() {   
        public void onClick(View arg0) {
            //下一篇
        }
    });
        //调整悬浮窗口
        wmParams.gravity=Gravity.RIGHT|Gravity.CENTER_VERTICAL;
        //显示myFloatView图像
        wm.addView(rightbtn, wmParams);
    }

我把图片的Alpha值设置为0，是因为不想让悬浮按钮一开始就展现出来;我想通过对屏幕的触摸来实现悬浮按钮的渐变显示和渐变隐藏。那么我们还要对图片的渐变效果进行下处理：

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    // ImageView的alpha值  
    private int mAlpha = 0;
    private boolean isHide;
    /**
     * 图片渐变显示处理
     */
    private Handler mHandler = new Handler()
    {
    public void handleMessage(Message msg) {
        if(msg.what==1 && mAlpha<255){  
        //System.out.println("---"+mAlpha);                
        mAlpha += 50;
        if(mAlpha>255)
            mAlpha=255;
             leftbtn.setAlpha(mAlpha);
             leftbtn.invalidate();
             rightbtn.setAlpha(mAlpha);
             rightbtn.invalidate();
        if(!isHide && mAlpha<255)
            mHandler.sendEmptyMessageDelayed(1, 100);
        }else if(msg.what==0 && mAlpha>0){
        //System.out.println("---"+mAlpha);
        mAlpha -= 10;
        if(mAlpha<0)
            mAlpha=0;
        leftbtn.setAlpha(mAlpha);
        leftbtn.invalidate();
        rightbtn.setAlpha(mAlpha);
        rightbtn.invalidate();
        if(isHide && mAlpha>0)
            mHandler.sendEmptyMessageDelayed(0, 100);
        }          
    }
    };

我们再用2个方法分别来控制悬浮按钮的显示、隐藏：

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private void showFloatView(){
    isHide = false;
    mHandler.sendEmptyMessage(1);
}
 
private void hideFloatView(){
new Thread(){
    public void run() {
    try {
               Thread.sleep(1500);
               isHide = true;
               mHandler.sendEmptyMessage(0);
         } catch (Exception e) {
                ;
         }
    }
}.start();
}

这里为了不让悬浮按钮显示后，马上就开始隐藏。我使用了一个线程，先暂停1.5秒钟，再开始渐变隐藏。
接下来，我要重写Activity的onTouchEvent触屏事件，代码如下：

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    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_MOVE:
        case MotionEvent.ACTION_DOWN:
        //System.out.println("========ACTION_DOWN");
        showFloatView();           
        break;
        case MotionEvent.ACTION_UP:
        //System.out.println("========ACTION_UP");
        hideFloatView();               
        break;
    }
    return true;
    }

最后，要在Activity销毁时销毁悬浮按钮，不然悬浮按钮会一直悬浮在那。因此，我们要再重写Activity的onDestroy()方法，并调用WindowManager的removeView()方法来移除悬浮按钮。

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    @Override
    public void onDestroy(){
        super.onDestroy();
        //在程序退出(Activity销毁）时销毁悬浮窗口
        wm.removeView(leftbtn);
        wm.removeView(rightbtn);
    }

给大家展示下效果图：
技术分享

下面是程序的完整代码：

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package com.liux.pageflipper;
 
import android.app.Activity;
import android.graphics.PixelFormat;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.widget.ImageView;
import android.widget.ViewFlipper;
/**
 * 悬浮按钮实现翻篇效果
 * <a href="http://my.oschina.net/arthor" target="_blank" rel="nofollow">@author</a> liux  http://my.oschina.net/liux
 * @date 2012-2-10 下午2:48:52
 */
public class PageFlipperActivity extends Activity{
     
    private WindowManager wm=null;
    private WindowManager.LayoutParams wmParams=null;
     
    private ImageView leftbtn=null;
    private ImageView rightbtn=null;
     
    // ImageView的alpha值  
    private int mAlpha = 0;
    private boolean isHide;
     
    private ViewFlipper viewFlipper = null;
     
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
         
        viewFlipper = (ViewFlipper) this.findViewById(R.id.myViewFlipper);
         
        //初始化悬浮按钮
         initFloatView();
     
    }
    /**
     * 初始化悬浮按钮
     */
    private void initFloatView(){
        //获取WindowManager
        wm=(WindowManager)getApplicationContext().getSystemService("window");
        //设置LayoutParams(全局变量）相关参数
        wmParams = new WindowManager.LayoutParams();
         
        wmParams.type=LayoutParams.TYPE_PHONE;   //设置window type
        wmParams.format=PixelFormat.RGBA_8888;   //设置图片格式，效果为背景透明
         //设置Window flag
        wmParams.flags=LayoutParams.FLAG_NOT_TOUCH_MODAL
                               | LayoutParams.FLAG_NOT_FOCUSABLE;
 
        //以屏幕左上角为原点，设置x、y初始值
         wmParams.x=0;
        wmParams.y=0;
        //设置悬浮窗口长宽数据
         wmParams.width=50;
        wmParams.height=50;
         
        //创建悬浮按钮
         createLeftFloatView();
        createRightFloatView();
    }
     
    /**
     * 创建左边悬浮按钮
     */
    private void createLeftFloatView(){
        leftbtn=new ImageView(this);
        leftbtn.setImageResource(R.drawable.prev);
        leftbtn.setAlpha(0);
        leftbtn.setOnClickListener(new View.OnClickListener() {
                public void onClick(View arg0) {
        //上一篇
        viewFlipper.setInAnimation(PageFlipperActivity.this, R.anim.in_leftright);
        viewFlipper.setOutAnimation(PageFlipperActivity.this, R.anim.out_leftright);
        viewFlipper.showPrevious();
        }
    });
        //调整悬浮窗口
          wmParams.gravity=Gravity.LEFT|Gravity.CENTER_VERTICAL;
         //显示myFloatView图像
          wm.addView(leftbtn, wmParams);
    }
    /**
     * 创建右边悬浮按钮
     */
    private void createRightFloatView(){
        rightbtn=new ImageView(this);
        rightbtn.setImageResource(R.drawable.next);
        rightbtn.setAlpha(0);
         rightbtn.setOnClickListener(new View.OnClickListener() {  
        public void onClick(View arg0) {
        //下一篇
        viewFlipper.setInAnimation(PageFlipperActivity.this, R.anim.in_rightleft);
        viewFlipper.setOutAnimation(PageFlipperActivity.this, R.anim.out_rightleft);
        viewFlipper.showNext();
        }
    });
        //调整悬浮窗口
          wmParams.gravity=Gravity.RIGHT|Gravity.CENTER_VERTICAL;
         //显示myFloatView图像
          wm.addView(rightbtn, wmParams);
    }
    /**
     * 图片渐变显示处理
     */
    private Handler mHandler = new Handler()
    {
    public void handleMessage(Message msg) {
                if(msg.what==1 && mAlpha<255){  
        //System.out.println("---"+mAlpha);                
        mAlpha += 50;
        if(mAlpha>255)
                mAlpha=255;
        leftbtn.setAlpha(mAlpha);
        leftbtn.invalidate();
        rightbtn.setAlpha(mAlpha);
        rightbtn.invalidate();
        if(!isHide && mAlpha<255)
            mHandler.sendEmptyMessageDelayed(1, 100);
        }else if(msg.what==0 && mAlpha>0){
        //System.out.println("---"+mAlpha);
        mAlpha -= 10;
        if(mAlpha<0)
            mAlpha=0;
        leftbtn.setAlpha(mAlpha);
        leftbtn.invalidate();
        rightbtn.setAlpha(mAlpha);
        rightbtn.invalidate();
        if(isHide && mAlpha>0)
            mHandler.sendEmptyMessageDelayed(0, 100);
        }          
    }
    };
     
    private void showFloatView(){
        isHide = false;
        mHandler.sendEmptyMessage(1);
    }
     
    private void hideFloatView(){
    new Thread(){
                public void run() {
            try {
                 Thread.sleep(1500);
                 isHide = true;
                 mHandler.sendEmptyMessage(0);
            } catch (Exception e) {
                 ;
            }
        }
    }.start();
    }
     
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_MOVE:
        case MotionEvent.ACTION_DOWN:
        //System.out.println("========ACTION_DOWN");
        showFloatView();           
        break;
        case MotionEvent.ACTION_UP:
        //System.out.println("========ACTION_UP");
        hideFloatView();               
        break;
    }
    return true;
    }
 
    @Override
    public void onDestroy(){
        super.onDestroy();
        //在程序退出(Activity销毁）时销毁悬浮窗口
        wm.removeView(leftbtn);
        wm.removeView(rightbtn);
    }
}

附上源码：http://www.oschina.net/code/snippet_157182_8608

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