自定义左右侧滑菜单
一、首先新建一个类，继承RelativeLayout，重写其构造方法。
public class MyMenu extends RelativeLayout {
public MyMenu(Context context) {
this(context, null);
}
public MyMenu(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public MyMenu(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
}
二、把实现效果分成三个部分，即中间部分跟左右两个部分，以中间部分为主体，创建三个FrameLayout，并添加到布局。
private Context context;
private FrameLayout leftMenu;
private FrameLayout bodyMenu;
private FrameLayout rightMenu;
private FrameLayout bodyMask;
private Scroller mScroller;
/**
* 初始化
* @param context
*/
private void init(Context context) {
this.context = context;
mScroller = new Scroller(context, new DecelerateInterpolator());
leftMenu = new FrameLayout(context);
bodyMenu = new FrameLayout(context);
rightMenu = new FrameLayout(context);
bodyMask = new FrameLayout(context);
leftMenu.setBackgroundColor(Color.YELLOW);
bodyMenu.setBackgroundColor(Color.RED);
rightMenu.setBackgroundColor(Color.GREEN);
bodyMask.setBackgroundColor(0x88000000);
leftMenu.setId(R.id.LETF_ID);
bodyMenu.setId(R.id.BODY_ID);
rightMenu.setId(R.id.RIGTH_ID);
addView(leftMenu);
addView(bodyMenu);
addView(rightMenu);
addView(bodyMask);
bodyMask.setAlpha(0);
}其中setId() 用于添加页面，需要在values中创建一个ids.xml文件
<resources>
<item name="LETF_ID" format="integer" type="id">0xaabbccitem>
<item name="BODY_ID" format="integer" type="id">0xaabbccitem>
<item name="RIGTH_ID" format="integer" type="id">0xaabbccitem>
resources>三、重写onMeasure() 方法，获取屏幕的宽高，并计算FrameLayout的大小。
/**
* 计算布局大小
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
bodyMenu.measure(widthMeasureSpec, heightMeasureSpec);
bodyMask.measure(widthMeasureSpec,heightMeasureSpec);
// 获取屏幕的最大宽度
int realWidth = MeasureSpec.getSize(widthMeasureSpec);
// 屏幕百分之八十的宽度
int tempWidthMeasure = MeasureSpec.makeMeasureSpec((int) (realWidth * 0.8f), MeasureSpec.EXACTLY);
leftMenu.measure(tempWidthMeasure, heightMeasureSpec);
rightMenu.measure(tempWidthMeasure, heightMeasureSpec);
}四、重写onLayout() 方法，计算FrameLayout 的初始位置。
/**
* 计算启始位置
*/
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
bodyMenu.layout(l, t, r, b);
bodyMask.layout(l, t, r, b);
leftMenu.layout(-leftMenu.getMeasuredWidth(), t, r, b);
rightMenu.layout(l + bodyMenu.getMeasuredWidth(), t, l + bodyMenu.getMeasuredWidth() + r + rightMenu.getMeasuredWidth(), b);
}五、添加滑动监听事件。
/**
* 事件监听处理
*/
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (!isTestCompete) {
getEventType(ev);
return true;
}
// 左右滑动
if (isleftrightEvent) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_MOVE:
int curScrollX = getScrollX(); // 获取滚动距离
int dis_x = (int) (ev.getX() - point.x); // 获取手指滑动距离
int expectX = -dis_x + curScrollX;
int finalX = 0;
if (expectX < 0) {
finalX = Math.max(expectX, -leftMenu.getMeasuredWidth()); // 向左
} else {
finalX = Math.min(expectX, rightMenu.getMeasuredWidth()); //向右
}
scrollTo(finalX, 0); //移动
point.x = (int) ev.getX();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
curScrollX = getScrollX();
if (Math.abs(curScrollX) > leftMenu.getMeasuredWidth() >> 1) {
if (curScrollX < 0) {
mScroller.startScroll(curScrollX,0,-leftMenu.getMeasuredWidth()-curScrollX,0,200);
}else{
mScroller.startScroll(curScrollX,0,leftMenu.getMeasuredWidth()-curScrollX,0,200);
}
}else{
mScroller.startScroll(curScrollX,0,-curScrollX,0,200);
}
invalidate();
isleftrightEvent = false;
isTestCompete = false;
break;
}
} else {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
isleftrightEvent = false;
isTestCompete = false;
break;
}
}
return super.dispatchTouchEvent(ev);
}
private Point point = new Point();
private static final int TEST_DIS = 20;
private boolean isleftrightEvent;
private void getEventType(MotionEvent ev) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
point.x = (int) ev.getX();
point.y = (int) ev.getY();
super.dispatchTouchEvent(ev);
break;
case MotionEvent.ACTION_MOVE:
int dx = Math.abs((int) (ev.getX() - point.x));
int dy = Math.abs((int) (ev.getY() - point.y));
if (dx > TEST_DIS && dx > dy) {
//左右滑动
isleftrightEvent = true;
isTestCompete = true;
point.x = (int) ev.getX();
point.y = (int) ev.getY();
} else if (dy > TEST_DIS && dy > dx) {
//上下滑动
isleftrightEvent = false;
isTestCompete = true;
point.x = (int) ev.getX();
point.y = (int) ev.getY();
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
super.dispatchTouchEvent(ev);
isTestCompete = false;
isleftrightEvent = false;
break;
default:
break;
}
}六、添加左右滑动动画
private Scroller mScroller;
private void init(Context context) {
// 在init（）方法中添加Scroller的初始化
mScroller = new Scroller(context, new DecelerateInterpolator());
}
// 在事件监听dispatchTouchEvent（）方法中添加滑动位置
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
curScrollX = getScrollX();
if (Math.abs(curScrollX) > leftMenu.getMeasuredWidth() >> 1) {
if (curScrollX < 0) {
mScroller.startScroll(curScrollX,0,-leftMenu.getMeasuredWidth()-curScrollX,0,200);
}else{
mScroller.startScroll(curScrollX,0,leftMenu.getMeasuredWidth()-curScrollX,0,200);
}
}else{
mScroller.startScroll(curScrollX,0,-curScrollX,0,200);
}
// 刷新
invalidate();
isleftrightEvent = false;
isTestCompete = false;
break;
// 最后别忘了添加滑动方法，不然不会执行滑动效果
@Override
public void computeScroll() {
super.computeScroll();
if(!mScroller.computeScrollOffset()){
return;
}
int tempX = mScroller.getCurrX();
scrollTo(tempX,0);
}七、进行滑动阴影模板计算。
/**
* 滑动
*/
@Override
public void scrollTo(int x, int y) {
super.scrollTo(x, y);
int curX = Math.abs(getScrollX());
float scale = curX/(float)leftMenu.getMeasuredWidth();
bodyMask.setAlpha(scale);
System.out.println("透明度："+scale);
}这样就完成一个简单的自定义左右侧滑菜单，在mainActivtiy中可以这样调用。
package com.niowoo.laok.iliaotian;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
private MyMenu myMenu;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myMenu = new MyMenu(this);
setContentView(myMenu);
// 使用app包下的Framgnet添加布局
getFragmentManager().beginTransaction().replace(R.id.LETF_ID,new TestFragment()).commit();
}
}Fragment的代码，记住是app包下的Fragment。
package com.niowoo.laok.iliaotian;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
private MyMenu myMenu;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myMenu = new MyMenu(this);
setContentView(myMenu);
// 使用app包下的Framgnet添加布局
getFragmentManager().beginTransaction().replace(R.id.LETF_ID,new TestFragment()).commit();
}
}Fragment的布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="@+id/button"
android:layout_gravity="center_horizontal" />
LinearLayout>