Android实现渐显按钮的左右滑动效果

[java]  package com.android.buttonpageflipper; 
 
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; 
 
/**
* Android实现带渐显按钮的左右滑动效果
* 自然状态下按钮不可见，触摸屏幕时显示按钮
* @author Administrator
*
*/ 
public class MainActivityextends Activity { 
//声明两个按钮，分别代表向左和向右滑动  
private ImageView btnLeft=null; 
private ImageView btnRight=null; 
 
//设置WindowManager  
private WindowManager wm=null; 
private WindowManager.LayoutParams wmParams=null; 
 
//ImageView的alpha值  
private int mAlpha = 0; 
private boolean isHide; 
 
private ViewFlipper viewFlipper = null; 
 
/** Called when the activity is first created.*/ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 
 
setTitle("Android实现渐显按钮的左右滑动效果"); 
viewFlipper = (ViewFlipper) this.findViewById(R.id.myViewFlipper); 
 
//初始化左右按钮  
initImageButtonView(); 
} 
 
/**
* 初始化悬浮按钮
*/ 
private void initImageButtonView(){ 
//获取WindowManager  
wm=(WindowManager)getApplicationContext().getSystemService("window"); 
 
//设置LayoutParams相关参数  
wmParams = new WindowManager.LayoutParams(); 
 
//设置window type  
wmParams.type=LayoutParams.TYPE_PHONE;  
 
//设置图片格式，效果为背景透明  
wmParams.format=PixelFormat.RGBA_8888;  
 
//设置Window flag参数  
wmParams.flags=LayoutParams.FLAG_NOT_TOUCH_MODAL  
| LayoutParams.FLAG_NOT_FOCUSABLE; 
 
//设置x、y初始值  
wmParams.x=0; 
wmParams.y=0; 
 
//设置窗口长宽数据  
wmParams.width=50; 
wmParams.height=50; 
 
//创建左右按钮  
createLeftButtonView(); 
createRightButtonView(); 
} 
 
/**
* 设置左边按钮
*/ 
private void createLeftButtonView(){ 
btnLeft=new ImageView(this); 
btnLeft.setImageResource(R.drawable.left); 
btnLeft.setAlpha(0); 
 
btnLeft.setOnClickListener(new View.OnClickListener() { 
public void onClick(View arg0) { 
//上一个图像  
viewFlipper.setInAnimation(MainActivity.this, R.anim.push_left_in); 
viewFlipper.setOutAnimation(MainActivity.this, R.anim.push_left_out); 
viewFlipper.showPrevious(); 
} 
}); 
 
//调整窗口  
wmParams.gravity=Gravity.LEFT|Gravity.CENTER_VERTICAL; 
 
//显示图像  
wm.addView(btnLeft, wmParams); 
} 
 
/**
* 设置右边按钮
*/ 
private void createRightButtonView(){ 
btnRight=new ImageView(this); 
btnRight.setImageResource(R.drawable.right); 
btnRight.setAlpha(0); 
 
btnRight.setOnClickListener(new View.OnClickListener() { 
public void onClick(View arg0) { 
//下一个图像  
viewFlipper.setInAnimation(MainActivity.this, R.anim.push_right_in); 
viewFlipper.setOutAnimation(MainActivity.this, R.anim.push_right_out); 
viewFlipper.showNext(); 
} 
}); 
 
//调整窗口  
wmParams.gravity=Gravity.RIGHT|Gravity.CENTER_VERTICAL; 
 
//显示图像  
wm.addView(btnRight, wmParams); 
} 
 
/**
* 设置按钮渐显效果
*/ 
private Handler mHandler = new Handler() 
{ 
public void handleMessage(Message msg) { 
if(msg.what==1 && mAlpha<255){  
//通过设置不透明度设置按钮的渐显效果  
mAlpha += 50; 
 
if(mAlpha>255) 
mAlpha=255; 
 
btnLeft.setAlpha(mAlpha); 
btnLeft.invalidate(); 
btnRight.setAlpha(mAlpha); 
btnRight.invalidate(); 
 
if(!isHide && mAlpha<255) 
mHandler.sendEmptyMessageDelayed(1, 100); 
}else if(msg.what==0 && mAlpha>0){ 
mAlpha -= 10; 
 
if(mAlpha<0) 
mAlpha=0; 
btnLeft.setAlpha(mAlpha); 
btnLeft.invalidate(); 
btnRight.setAlpha(mAlpha); 
btnRight.invalidate(); 
 
if(isHide && mAlpha>0) 
mHandler.sendEmptyMessageDelayed(0, 800); 
}  
} 
}; 
 
private void showImageButtonView(){ 
isHide = false; 
mHandler.sendEmptyMessage(1); 
} 
 
private void hideImageButtonView(){ 
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: 
showImageButtonView();  
break; 
case MotionEvent.ACTION_UP: 
hideImageButtonView();  
break; 
} 
 
return true; 
} 
 
@Override 
public void onDestroy(){ 
super.onDestroy(); 
//在程序退出(Activity销毁）时销毁窗口  
wm.removeView(btnLeft); 
wm.removeView(btnRight); 
} 
} 
package com.android.buttonpageflipper;

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;

/**
* Android实现带渐显按钮的左右滑动效果
* 自然状态下按钮不可见，触摸屏幕时显示按钮
* @author Administrator
*
*/
public class MainActivityextends Activity {
//声明两个按钮，分别代表向左和向右滑动
private ImageView btnLeft=null;
private ImageView bt

补充：移动开发 , Android ,

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