CoordinatorLayout --自定义Behavior

1.加入com.android.support:design:24.1.1包引用

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2.自定义 CoordinatorLayout.Behavior
public class EasyBehavior extends CoordinatorLayout.Behavior<TextView> {//这里的泛型是child的类型，也就是观察者View
public EasyBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}

@Override
public boolean layoutDependsOn(CoordinatorLayout parent, TextView child, View dependency) {
//告知监听的父控件是Button
return dependency instanceof Button;
}

@Override
//当 dependency(Button)变化的时候，可以对child(TextView)进行操作
public boolean onDependentViewChanged(CoordinatorLayout parent, TextView child, View dependency) {
child.setX(dependency.getX()+200);
child.setY(dependency.getY()+200);
child.setText(dependency.getX()+","+dependency.getY());
return true;
}
}

3.加载这个自定义的Behavior（注意包名要写对）

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4.Textview将跟随Bottom移动了

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