知识点提示:
一、在ViewGroup中,让自己内容移动有以下几个方法:
1 、layout(l,t,r,b);
2、offsetTopAndBottom(offset)和offsetLeftAndRight(offset);
3、scrollTo和scrollBy方法;
注意:滚动的并不是viewgroup内容本身,而是它的矩形边框
它是瞬间移动,
4、event.getX()和event.getRawX(),前者是触摸点相对于view左上角的坐标,后者是触摸点相对于屏幕左上角的坐标
5、View移动可以细分为2类:
a.view本身在父view中移动,即整体移动,同时该分类也可看做是父view的内容在移动
b.view的内容在移动,即内部移动
二、在自定义ViewGroup中一般不需要去实现onMeasure,
我们去实现系统已有的ViewGroup,比如FrameLayout,
它会帮我们区实现onMeasure方法
三、让view在一段时间内移动到某个位置
1、.使用自定义动画(让view在一段时间内做某件事)
2、.使用Scroller(模拟一个执行流程,)
效果图:
第一步:分别创建侧滑菜单(使用scrollView) 主页面 两个布局文件
layout_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="240dp"
android:layout_height="match_parent"
android:background="@drawable/menu_bg"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingBottom="300dp">
<TextView
style="@style/MenuTabText"
android:background="#33aa9900"
android:drawableLeft="@drawable/tab_news"
android:text="新闻" />
<TextView
style="@style/MenuTabText"
android:drawableLeft="@drawable/tab_read"
android:text="订阅" />
<TextView
style="@style/MenuTabText"
android:drawableLeft="@drawable/tab_ties"
android:text="跟帖" />
<TextView
style="@style/MenuTabText"
android:drawableLeft="@drawable/tab_pics"
android:text="图片" />
<TextView
style="@style/MenuTabText"
android:drawableLeft="@drawable/tab_ugc"
android:text="话题" />
<TextView
style="@style/MenuTabText"
android:drawableLeft="@drawable/tab_vote"
android:text="投票" />
<TextView
style="@style/MenuTabText"
android:drawableLeft="@drawable/tab_focus"
android:text="聚合阅读" />
</LinearLayout>
</ScrollView>
layout_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#55666666"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:background="@drawable/top_bar_bg"
android:gravity="center_vertical"
android:orientation="horizontal">
<ImageView
android:id="@+id/btn_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/main_back" />
<View
android:layout_width="1dp"
android:layout_height="match_parent"
android:layout_marginBottom="5dp"
android:layout_marginTop="5dp"
android:background="@drawable/top_bar_divider" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:text="xxxx新闻"
android:textColor="#ffffff"
android:textSize="22sp" />
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="。。。。。"
android:textColor="#000000"
android:textSize="30sp" />
</LinearLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.zaizai.sildeslipmenu.MainActivity">
<com.zaizai.sildeslipmenu.view.SlideMenu
android:id="@+id/slideMenu"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<!--菜单界面-->
<include layout="@layout/layout_menu"/>
<!--主界面-->
<include layout="@layout/layout_main"/>
</com.zaizai.sildeslipmenu.view.SlideMenu>
</RelativeLayout>
自定义动画类SlideMenu.java
package com.zaizai.sildeslipmenu.view;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Transformation;
/**
* 让指定view在一段时间内scrollTo到指定位置
* @author Administrator
*
*/
public class ScrollAnimation extends Animation{
private View view;
private int targetScrollX;
private int startScrollX;
private int totalValue;
public ScrollAnimation(View view, int targetScrollX) {
super();
this.view = view;
this.targetScrollX = targetScrollX;
startScrollX = view.getScrollX();
totalValue = this.targetScrollX - startScrollX;
int time = Math.abs(totalValue);
setDuration(time);
}
/**
* 在指定的时间内一直执行该方法,直到动画结束
* interpolatedTime:0-1 标识动画执行的进度或者百分比
* time : 0 - 0.5 - 0.7 - 1
* value: 10 - 60 - 80 - 110
* 当前的值 = 起始值 + 总的差值*interpolatedTime
*/
@Override
protected void applyTransformation(float interpolatedTime,
Transformation t) {
super.applyTransformation(interpolatedTime, t);
int currentScrollX = (int) (startScrollX + totalValue*interpolatedTime);
view.scrollTo(currentScrollX, 0);
}
}
自定义类
package com.zaizai.sildeslipmenu.view;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.Scroller;
/**
* Created by zaizai on 2015/11/24.
*/
public class SlideMenu extends FrameLayout {
private static final String TAG = "zaizai";
private ScrollAnimation animation;
private View menuView;
private View mainView;
private int screenHight = 0;
private int downX;
private int menuWidth;
private Scroller scroller;
public SlideMenu(Context context) {
super(context);
init();
}
public SlideMenu(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
scroller = new Scroller(getContext());
}
/**
* 当1级的子view全部加载完调用可以用初始化子view的引用
* 这里无法获取子view 的宽高
*/
@Override
protected void onFinishInflate() {
super.onFinishInflate();
menuView = getChildAt(0);
mainView = getChildAt(1);
menuWidth = menuView.getLayoutParams().width;
}
/**
* widthMeasureSpec heightMeasureSpec 是系统测量SildeMenu时传入的参数
* 这两个参数测量出的狂傲能让SlideMenu充满窗体,其实是正好等于屏幕宽高
*/
/* @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//1、测量所有子view
//通过getLayoutParams 可以获得布局文件中制定的宽高
menuView.measure(menuWidth, heightMeasureSpec);
//2、直接使用SlideMenu的测量参数,因为他们的宽高都一样是充满父窗体
mainView.measure(widthMeasureSpec, heightMeasureSpec);
}*/
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
//l:当前子view距离父View坐标系中的X坐标 t:当前子View在父View坐标系中的Y坐标
// r:
Log.i(TAG, "menuViewR:" + menuView.getMeasuredWidth() + "b:" + menuView.getMeasuredHeight());
Log.i(TAG, "mainViewR:" + mainView.getLayoutParams().width + "b:" + mainView.getLayoutParams().height);
menuView.layout(-menuWidth, 0, 0, b);
mainView.layout(0, t, r, b);
}
//拦截触摸事件,试之不传递给ScrollView处理。
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = (int) ev.getX();
break;
case MotionEvent.ACTION_MOVE:
int deltaX = (int) (ev.getX() - downX);
if (Math.abs(deltaX) > 8) {
return true;
}
break;
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
downX = (int) event.getX();
break;
}
case MotionEvent.ACTION_MOVE: {
Log.i(TAG, "getScrollX:" + getScrollX());
/*gex()触摸屏幕的x坐标*/
Log.i(TAG, "getX:" + event.getX());
int moveX = (int) event.getX();
/*触摸移动的距离*/
int deltaX = moveX - downX;
int newScaleX = (int) (getScrollX() - deltaX);
if (newScaleX < -menuWidth) {
newScaleX = -menuWidth;
}
if (newScaleX > 0) {
newScaleX = 0;
}
downX = moveX;
scrollTo(newScaleX, 0);
break;
}
case MotionEvent.ACTION_UP: {
if (getScrollX() > (-menuWidth) / 2) {
/*关闭菜单*/
closeMenu();
} else {
/*打开菜单*/
openMenu();
}
break;
}
default: {
break;
}
}
return true;
// return super.onTouchEvent(event);
}
private void openMenu() {
/* scroller.startScroll(getScrollX(), 0, -menuWidth - getScrollX(), 0, 400);
invalidate();*/
scrollTo(-menuWidth, 0);
animation = new ScrollAnimation(this, -menuWidth);
startAnimation(animation);
}
private void closeMenu() {
scrollTo(0, 0);
animation = new ScrollAnimation(this, 0);
startAnimation(animation);
/*scroller.startScroll(getScrollX(), 0, 0 - getScrollX(), 0, 400);
invalidate();*/
}
/**
* Scroller不主动去调用这个方法
* 而invalidate()可以掉这个方法
* invalidate->draw->computeScroll
*/
/* @Override
public void computeScroll() {
super.computeScroll();
if (scroller.computeScrollOffset()) {//返回true,表示动画没结束
scrollTo(scroller.getCurrX(), 0);
invalidate();
}
}*/
/**
* 切换菜单的开和关
*/
public void switchMenu() {
if (getScrollX() == 0) {
//需要打开
openMenu();
} else {
//需要关闭
closeMenu();
}
}
}
主activity
package com.zaizai.sildeslipmenu;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.ImageView;
import com.zaizai.sildeslipmenu.view.SlideMenu;
public class MainActivity extends AppCompatActivity {
private ImageView btnBack;
private SlideMenu slideMenu;
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnBack = (ImageView) findViewById(R.id.btn_back);
slideMenu = (SlideMenu) findViewById(R.id.slideMenu);
btnBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
slideMenu.switchMenu();
}
});
}
}