Android 可开关式顶部下拉view

效果：

 

实现方法

1、layout文件结构

最外部使用相对布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

布局最下面添加头部下拉可隐藏view

 

    <LinearLayout
        android:id="@+id/mmm"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal"
        android:background="@color/colorPrimaryDark">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:textColor="@color/colorAccent"
            android:textSize="18dp"
            android:text="可开关——下拉view"/>
    </LinearLayout>

</RelativeLayout>

2、activity实现下拉显示与隐藏

1、实例化

private LinearLayout mNumberLayout;

private int mTranslationY = 0;

mNumberLayout = (LinearLayout) findViewById(R.id.mmm);

2、显示，隐藏、两个方法

private void showNumberView()
{
    ViewHelper.setAlpha(mNumberLayout, 0);
    ViewHelper.setTranslationY(mNumberLayout,
            mTranslationY - mNumberLayout.getHeight());
    ViewPropertyAnimator.animate(mNumberLayout).alpha(1f).translationY(mTranslationY)
            .setInterpolator(new DecelerateInterpolator()).setDuration(300)
            .setStartDelay(0).setListener(new CustomAnimatorListener()
    {
        @Override
        public void onAnimationEnd(Animator animator)
        {

        }
    }).start();
}

private void hideNumberView()
{
    ViewPropertyAnimator.animate(mNumberLayout).alpha(0f)
            .translationY(-mNumberLayout.getHeight() + mTranslationY)
            .setInterpolator(new AccelerateInterpolator()).setDuration(300)
            .setListener(new CustomAnimatorListener()
            {
                @Override
                public void onAnimationEnd(Animator animator)
                {

                }
            }).start();

}

 

3、点击方法

private boolean ifshow;

layout_bottom_bar.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        if (ifshow){
            showNumberView();
            ifshow=!ifshow;
        }else {
            hideNumberView();
            ifshow=!ifshow;
        }
    }
});