需要注意的时本例中导入了com.nineoldandroids.view.ViewHelper的包,还用到了常用的ScreenUtils 辅助类来获取屏幕的信息。jar包可以在网盘中寻找。
另外,关于动画可参考http://code1.okbase.net/codefile/ViewHelper.java_2014032025926_38.htm
本文参照:http://blog.youkuaiyun.com/lmj623565791/article/details/39257409
更高级用法:http://blog.youkuaiyun.com/lmj623565791/article/details/41531475
神级用法:http://blog.youkuaiyun.com/lmj623565791/article/details/39670935
所以在以后的实践中要注意jar的使用,以及常用辅助类的总结
主程序
package com.test.mysideslip;
import android.support.v7.app.ActionBarActivity;
import com.test.sideslip.SlidingMenu;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.LinearLayout;
public class MainActivity extends Activity {
private SlidingMenu mMenu;
private LinearLayout mLinearLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
mMenu = (SlidingMenu) findViewById(R.id.id_menu);
}
public void toggle_Menu(View view)
{
mMenu.toggle();
}
public void linear_toggle_Menu(View view){
//实现一点击主页面时,就进入主页面
mMenu.toggle();
}
}
滑动效果实现的主要程序
package com.test.sideslip;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import com.nineoldandroids.view.ViewHelper;
import com.test.mysideslip.R;
public class SlidingMenu extends HorizontalScrollView
{
/**
* 屏幕宽度
*/
private int mScreenWidth;
/**
* dp
*/
private int mMenuRightPadding;
/**
* 开始隐藏菜单的宽度
*/
private int mMenuWidth;
private int mHalfMenuWidth;
private boolean isOpen;
private boolean once;
private ViewGroup mMenu;
private ViewGroup mContent;
public SlidingMenu(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public SlidingMenu(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
mScreenWidth = ScreenUtils.getScreenWidth(context);
//类型的数组,得到所有theme
//Sliding属性是定义在xml文件中的
TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
R.styleable.SlidingMenu, defStyle, 0);
int n = a.getIndexCount();
for (int i = 0; i < n; i++)
{
int attr = a.getIndex(i);
switch (attr)
{
case R.styleable.SlidingMenu_rightPadding:
// 默认50,后面传入的为默认值
mMenuRightPadding = a.getDimensionPixelSize(attr,
(int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 50f,
getResources().getDisplayMetrics()));
break;
}
}
a.recycle();
}
public SlidingMenu(Context context)
{
this(context, null, 0);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
/**
* 显示的设置一个宽度
*/
if (!once)
{
LinearLayout wrapper = (LinearLayout) getChildAt(0);
mMenu = (ViewGroup) wrapper.getChildAt(0);
mContent = (ViewGroup) wrapper.getChildAt(1);
//需要注意的mMenuWidth是屏幕的总宽度减去已经隐藏起来的右边内容的宽度
//所以mMenuWidth会越来越小。
mMenuWidth = mScreenWidth - mMenuRightPadding;
mHalfMenuWidth = mMenuWidth / 2;
mMenu.getLayoutParams().width = mMenuWidth;
//在屏幕上显示的部分
mContent.getLayoutParams().width = mScreenWidth;
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
/**
* 布局发生变化时调用的方法
*/
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
super.onLayout(changed, l, t, r, b);
if (changed)
{
// 将菜单隐藏
this.scrollTo(mMenuWidth, 0);
once = true;
}
}
@Override
public boolean onTouchEvent(MotionEvent ev)
{
int action = ev.getAction();
switch (action)
{
// Up时,进行判断,如果显示区域大于菜单宽度一半则完全显示,否则隐藏
case MotionEvent.ACTION_UP:
int scrollX = getScrollX();
if (scrollX > mHalfMenuWidth)
{
//菜单就是最开始的隐藏部分
this.smoothScrollTo(mMenuWidth, 0);
isOpen = false;
} else
{
this.smoothScrollTo(0, 0);
isOpen = true;
}
return true;
}
return super.onTouchEvent(ev);
}
//下面的三个方法完全是为了左上角的按钮切换。
/**
* 打开菜单
*/
public void openMenu()
{
if (isOpen)
return;
this.smoothScrollTo(0, 0);
isOpen = true;
}
/**
* 关闭菜单
*/
public void closeMenu()
{
if (isOpen)
{
this.smoothScrollTo(mMenuWidth, 0);
isOpen = false;
}
}
/**
* 切换菜单状态
*/
public void toggle()
{
if (isOpen)
{
closeMenu();
} else
{
openMenu();
}
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt)
{
super.onScrollChanged(l, t, oldl, oldt);
//得到左边隐藏宽度的单位宽度
float scale = l * 1.0f / mMenuWidth;
//左边的缩小比例
float leftScale = 1 - 0.3f * scale;
//右边的缩小比例
float rightScale = 0.8f + scale * 0.2f;
//放大缩小布局文件
ViewHelper.setScaleX(mMenu, leftScale);
ViewHelper.setScaleY(mMenu, leftScale);
ViewHelper.setAlpha(mMenu, 0.6f + 0.4f * (1 - scale));
ViewHelper.setTranslationX(mMenu, mMenuWidth * scale * 0.6f);
//设置缩放的中心线,就是scale时沿哪条中心线进行缩放。
ViewHelper.setPivotX(mContent, 0);
ViewHelper.setPivotY(mContent, mContent.getHeight()/2 );
//之所以用这个值的原因已经在onMeasure中解释
ViewHelper.setScaleX(mContent, rightScale);
ViewHelper.setScaleY(mContent, rightScale);
}
}
屏幕测量辅助类
package com.test.sideslip;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;
public class ScreenUtils {
private ScreenUtils() {
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}
/**
* 获得屏幕高度
*
* @param context
* @return
*/
public static int getScreenWidth(Context context) {
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.widthPixels;
}
/**
* 获得屏幕宽度
*
* @param context
* @return
*/
public static int getScreenHeight(Context context) {
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.heightPixels;
}
/**
* 获得状态栏的高度
*
* @param context
* @return
*/
public static int getStatusHeight(Context context) {
int statusHeight = -1;
try {
Class<?> clazz = Class.forName("com.android.internal.R$dimen");
Object object = clazz.newInstance();
int height = Integer.parseInt(clazz.getField("status_bar_height").get(object).toString());
statusHeight = context.getResources().getDimensionPixelSize(height);
} catch (Exception e) {
e.printStackTrace();
}
return statusHeight;
}
/**
* 获取当前屏幕截图,包含状态栏
*
* @param activity
* @return
*/
public static Bitmap snapShotWithStatusBar(Activity activity) {
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
int width = getScreenWidth(activity);
int height = getScreenHeight(activity);
Bitmap bp = null;
bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
view.destroyDrawingCache();
return bp;
}
/**
* 获取当前屏幕截图,不包含状态栏
*
* @param activity
* @return
*/
public static Bitmap snapShotWithoutStatusBar(Activity activity) {
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
Rect frame = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
int width = getScreenWidth(activity);
int height = getScreenHeight(activity);
Bitmap bp = null;
bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height - statusBarHeight);
view.destroyDrawingCache();
return bp;
}
}
主布局文件
<com.test.sideslip.SlidingMenu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:zhy="http://schemas.android.com/apk/res/com.test.mysideslip"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:scrollbars="none"
android:id="@+id/id_menu"
zhy:rightPadding="100dp"
android:background="@drawable/c"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<include layout="@layout/layout_menu" />
<LinearLayout
android:id="@+id/main_pager_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/c"
android:onClick="linear_toggle_Menu" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="toggle_Menu"
android:text="切换菜单" />
</LinearLayout>
</LinearLayout>
</com.test.sideslip.SlidingMenu>
layout_menu.xml布局文件
<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/one"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:src="@drawable/c" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_toRightOf="@id/one"
android:text="第1个Item"
android:textColor="#f0f0f0"
android:textSize="20sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/two"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:src="@drawable/b" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_toRightOf="@id/two"
android:text="第2个Item"
android:textColor="#f0f0f0"
android:textSize="20sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/three"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:src="@drawable/b" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_toRightOf="@id/three"
android:text="第3个Item"
android:textColor="#f0f0f0"
android:textSize="20sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/four"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:src="@drawable/b" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_toRightOf="@id/four"
android:text="第一个Item"
android:textColor="#f0f0f0"
android:textSize="20sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/five"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:src="@drawable/b" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_toRightOf="@id/five"
android:text="第5个Item"
android:textColor="#f0f0f0"
android:textSize="20sp" />
</RelativeLayout>
</LinearLayout>
</RelativeLayout>
效果图
当这样写时可以实现另一种效果
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt)
{
super.onScrollChanged(l, t, oldl, oldt);
float scale = l * 1.0f / mMenuWidth;
// float leftScale = 1 - 0.3f * scale;
// float rightScale = 0.8f + scale * 0.2f;
//
// ViewHelper.setScaleX(mMenu, leftScale);
// ViewHelper.setScaleY(mMenu, leftScale);
// ViewHelper.setAlpha(mMenu, 0.6f + 0.4f * (1 - scale));
ViewHelper.setTranslationX(mMenu, mMenuWidth * scale );
// ViewHelper.setPivotX(mContent, 0);
// ViewHelper.setPivotY(mContent, mContent.getHeight() / 2);
// ViewHelper.setScaleX(mContent, rightScale);
// ViewHelper.setScaleY(mContent, rightScale);
}
3、动画比例的计算
我们在onScrollChanged里面,拿到 l 也就是个getScrollX,即菜单已经显示的宽度值;
[html] view plaincopy在CODE上查看代码片派生到我的代码片
float scale = l * 1.0f / mMenuWidth;
与菜单的宽度做除法运算,在菜单隐藏到显示整个过程,会得到1.0~0.0这么个变化的区间;
有了这个区间,就可以根据这个区间设置动画了;
1、首先是内容区域的缩放比例计算:
我们准备让在菜单出现的过程中,让内容区域从1.0~0.8进行变化~~
那么怎么把1.0~0.0转化为1.0~0.8呢,其实很简单了:
float rightScale = 0.8f + scale * 0.2f; (scale 从1到0 ),是不是哦了~
接下来还有3个动画:
2、菜单的缩放比例计算
仔细观察了下QQ,菜单大概缩放变化是0.7~1.0
float leftScale = 1 - 0.3f * scale;
3、菜单的透明度比例:
我们设置为0.6~1.0;即:0.6f + 0.4f * (1 - scale)
4、菜单的x方向偏移量:
看一下QQ,并非完全从被内容区域覆盖,还是有一点拖出的感觉,所以我们的偏移量这么设置:
tranlateX = mMenuWidth * scale * 0.6f ;刚开始还是让它隐藏一点点~~~