利用ObjectAnimator编写弹出式二级菜单

MainActivity.java

public class MainActivity extends AppCompatActivity {

private Toolbar mToolbar;
private ImageView mImageView;
private FrameLayout firstbar_layout,secondbar_layout;
private int animationDuration = 300;
private int animator_height,secondbar_height;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mToolbar = (Toolbar) findViewById(R.id.toolbar);
//Toolbar
mImageView = (ImageView)findViewById(R.id.image);
//占用屏幕空间的视图，这里用了图片来代替
firstbar_layout = (FrameLayout)findViewById(R.id.firstbar);
//一级菜单
secondbar_layout = (FrameLayout)findViewById(R.id.secondbar);
//二级菜单

animator_height = ScreenInfoUtil.dip2px(this, 50);
//界面中Toolbar和图片需要上移的高度
secondbar_height = ScreenInfoUtil.dip2px(this, 100);
//二级菜单的高度

firstbar_layout.setOnClickListener(new View.OnClickListener() { //一级菜单点击事件
@Override
public void onClick(View view) {
moveY(0, -animator_height);
moveBar(secondbar_height,0);
}
});
secondbar_layout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) { //二级菜单点击事件
moveY(-animator_height, 0);
moveBar(0,secondbar_height);
}
});
}

private void moveY(float startY, float endY) {
//利用ObjectAnimator实现视图的Y轴移动操作
Object[] animComponent = {mToolbar,mImageView};
//对Toolbar和ImageView进行移动
for (final Object obj : animComponent) {
ObjectAnimator animator = ObjectAnimator.ofFloat(obj,
"translationY", startY, endY);
animator.setDuration(animationDuration).setInterpolator(
new AccelerateDecelerateInterpolator());
animator.start();
}
}
private void moveBar(float startY, float endY) {
//利用ObjectAnimator实现二级菜单的弹出操作
secondbar_layout.setVisibility(View.VISIBLE);
Object[] animComponent = {secondbar_layout};
for (final Object obj : animComponent) {
ObjectAnimator animator = ObjectAnimator.ofFloat(obj,
"translationY", startY, endY);
animator.setDuration(animationDuration).setInterpolator(
new AccelerateDecelerateInterpolator());
animator.start();
}
}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/root_layout"
tools:context="com.lla.testviewup.MainActivity">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="?attr/colorPrimary"/>
<ImageView
android:layout_width="match_parent"
android:layout_height="280dp"
android:id="@+id/image"
android:layout_marginTop="120dp"
android:scaleType="centerCrop"
android:background="@drawable/godness"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="@+id/firstbar"
android:layout_alignParentBottom="true"
android:background="@color/colorPrimary"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:text="我是一级菜单，点我弹出二级菜单"/>
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="100dp"
android:id="@+id/secondbar"
android:layout_alignParentBottom="true"
android:background="@color/bottom_bar"
android:visibility="invisible">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:text="我是二级菜单，点我返回一级菜单"/>
</FrameLayout>
</RelativeLayout>