自定义控件在应用中非常重要，因此需要认真学习
自定义控件逻辑部分
package com.bwei.xmo;
import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.widget.LinearLayout;public class MainLinearLayout extends LinearLayout { //左边距 int left; /** * 判断侧滑菜单是否为展开 * true为关闭，false 为展开 */ boolean isClose=false; //判断是不是第一次进入的标记 boolean isFirst=false; int x; int y; int distancex; int distancey; //以恒定的速度移动 int speed=5; LinearLayout ll_left; MainLinearLayout ll_main; public void addrest(LinearLayout ll_left,MainLinearLayout ll_main){ this.ll_left=ll_left; this.ll_main=ll_main; } public MainLinearLayout(Context context) { super(context); } public MainLinearLayout(Context context, AttributeSet attrs) { super(context, attrs); } public MainLinearLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()){ case MotionEvent.ACTION_DOWN: /* * 通过宽度获取左边距,因为宽度和左边距相等 * 获取左边距 * left 必须为负 */ if (isFirst==false){ left=ll_left.getWidth()*(-1); isFirst=true; } x= (int) event.getX(); y= (int) event.getY(); break; case MotionEvent.ACTION_MOVE: /** * 得到滑动的距离 *比较华东的x和y的值判断时水平滑动还是上下滑动 * */ distancex= (int) (event.getX()-x); distancey= (int) (event.getY()-y); //如果滑动的x值大于y则为水平滑动 if (Math.abs(distancex)>Math.abs(distancey)){ /* * 判断是向左滑动还是向右滑动 * distancex 大于0 向右滑动, distancex 小于0 向左滑动 */ if (distancex>0){ left+=speed; //如果左边距大于0，则全部显示 if (left>0){ left=0; } }else { left-=speed; if (left<ll_left.getWidth()*(-1)){ left=ll_left.getWidth()*(-1); } } //动态设置左边距 LinearLayout.LayoutParams params= (LinearLayout.LayoutParams) ll_left.getLayoutParams(); params.leftMargin=left; ll_left.setLayoutParams(params); LinearLayout.LayoutParams params1= (LinearLayout.LayoutParams) ll_main.getLayoutParams(); params1.rightMargin=-(ll_left.getWidth()-Math.abs(left)); ll_main.setLayoutParams(params1); } break; case MotionEvent.ACTION_UP: /* * 抬起的时候,首先判断是左滑动还是右滑动 * 根据 distancex 判断,如果大于0 是向右滑动,如果小于 0 向左滑动 */ /* * 向右滑动的时候如果划出来的左边宽度小于整体宽度的一般的时候,设置自定弹回去 * 向左滑动的时候,如果进去的宽度大于一般,设置宽度为宽度,负责反之 */ if (Math.abs(left)>ll_left.getWidth()/2){ left=ll_left.getWidth()*(-1); isClose=true; }else{ left=0; isClose=false; } LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) ll_left.getLayoutParams(); params.leftMargin = left; ll_left.setLayoutParams(params); LinearLayout.LayoutParams params1= (LinearLayout.LayoutParams) ll_main.getLayoutParams(); params1.rightMargin=-(ll_left.getWidth()-Math.abs(left)); ll_main.setLayoutParams(params1); break; } return true; } public void LeftClose(){ if (isClose==false){ //当isClose==false展开侧滑菜单 isClose=true; Left(0); }else{ isClose=false; Left(-ll_left.getWidth()); } } public void Left(int left){ LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) ll_left.getLayoutParams(); params.leftMargin = left; ll_left.setLayoutParams(params); LinearLayout.LayoutParams params1= (LinearLayout.LayoutParams) ll_main.getLayoutParams(); params1.rightMargin=-(ll_left.getWidth()-Math.abs(left)); ll_main.setLayoutParams(params1); }}
//xml布局部分
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" > <!--左边的布局--> <LinearLayout android:id="@+id/ll_left" android:background="#ff00ff" android:layout_marginLeft="-150dp" android:layout_width="150dp" android:layout_height="match_parent" android:orientation="horizontal" > </LinearLayout> <!--主布局--> <com.bwei.xmo.MainLinearLayout android:id="@+id/ll_main" android:background="#00ff00" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/tv_main_click" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="20dp" android:text="展开" android:textSize="30sp" /> <ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:src="@mipmap/ic_launcher" /> </com.bwei.xmo.MainLinearLayout></LinearLayout>
//主函数调用
@Override PRotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ll_left = (LinearLayout) findViewById(R.id.ll_left); ll_main = (MainLinearLayout) findViewById(R.id.ll_main); main = (LinearLayout) findViewById(R.id.activity_main); tv_main_click = (TextView) findViewById(R.id.tv_main_click); ll_main.addrest(ll_left,ll_main); tv_main_click.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { ll_main.LeftClose(); } }); }
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