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。
首先,一个按钮要实现悬浮,就要用到系统*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" />
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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);
}
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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 );
}
}
};
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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 ;
}
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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);
}
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给大家展示下效果图:
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);
}
} |