VIew-CoordinatorLayout 笔记

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CoordinatorLayout

协调者：一般会是两个控件，一个Dependency一个child ，CoordinatorLayout的主要功能就是协调这两个控件，使child跟随Dependency的布局变化而变化（比如：位置，大小等）。其中变化的规则，则是由一个CoordinatorLayout.Behavior来决定。demo：

一：布局

<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <com.kxl.mydemo.view.CoordinaterDependencyView        android:id="@+id/coor_layout"        android:layout_width="60dp"        android:text="Dependency"        android:textColor="#000000"        android:layout_height="60dp"        android:background="#55ff55" />    <Button        android:layout_width="100dp"        android:layout_height="50dp"        android:background="#ff5555"        android:text="child"        app:layout_behavior="com.kxl.mydemo.coordinator.MoveBehavior" /></android.support.design.widget.CoordinatorLayout>

二。自定义的一个，可移动的view：com.kxl.mydemo.view.CoordinaterDependencyView

import android.content.Context;import android.support.design.widget.CoordinatorLayout;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;/** * Created by kxl on 2016/10/18. */public class CoordinaterDependencyView extends TextView {    private  String TAG = "CoordinaterDependencyView";    private int width;    private int height;    int lastx;    int lasty;    public CoordinaterDependencyView(Context context) {        super(context);        DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();        int displaywidth =  displayMetrics.widthPixels;        int displayheight =  displayMetrics.heightPixels;        Log.i(TAG,"displaywidth:"+displaywidth+"  displayheight:"+displayheight);    }    public CoordinaterDependencyView(Context context, AttributeSet attrs) {        super(context, attrs);        width = getMeasuredWidth();        height = getMeasuredHeight();    }    @Override    public boolean onTouchEvent(MotionEvent event) {        int x = (int)event.getRawX();        int y = (int)event.getRawY();        Log.i(TAG,"onTouchEvent x:"+x+"  y:"+y);        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:                break;            case MotionEvent.ACTION_MOVE:                ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) getLayoutParams();                int nx = layoutParams.leftMargin+x-lastx;                int ny = layoutParams.topMargin+y-lasty;                layoutParams.leftMargin = nx;                layoutParams.topMargin = ny;                setLayoutParams(layoutParams);                requestLayout();                break;            case MotionEvent.ACTION_UP:                break;            default:                break;        }        lastx = x;        lasty = y;        return true;    }}

三：协调规则。Behavior：

import android.content.Context;import android.support.design.widget.CoordinatorLayout;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.view.View;import android.view.ViewGroup;import com.kxl.mydemo.view.CoordinaterDependencyView;/** * Created by kxl on 2016/10/18. */public class MoveBehavior extends CoordinatorLayout.Behavior<View> {    int  width;    public MoveBehavior(Context context, AttributeSet attrs) {        super(context, attrs);        DisplayMetrics display = context.getResources().getDisplayMetrics();        width  = display.widthPixels;    }    /**     * @return 返回是否是child依赖的布局     */    @Override    public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {        return dependency instanceof CoordinaterDependencyView;    }    /**     *  dependency控件有变化时，会调用这个方法     */    @Override    public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {        ViewGroup.MarginLayoutParams pa = (ViewGroup.MarginLayoutParams) child.getLayoutParams();        pa.leftMargin = width  - dependency.getLeft();        pa.topMargin =  dependency.getTop();        child.setLayoutParams(pa);        return true;    }}

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