SelfAdjointView

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SelfAdjointView is an Android library that allows developers to easily let view change with the parent which can scroll. The animation contains one or more of parallax,alpha,scale.

Apply to

• ScrollView/HorizontalScrollView
• ListView/GridView
• RecyclerView
• ViewPager
• sth else that can scroll

EFFECT

.............

..............

Samples

click me

How do I use it?

Setup

dependencies {

// jCenter
compile 'com.cysion:adjointlib:1.3.0' 
}
 

Parallax

Now the effect can only use for image while the image can be places in any viewgroup provided it is AdjointImageView and it is wrapped by AdjointContainer. Note that in this condition, AdjointContainer should only have one child, and height/width of image should be larger than that of AdjointContainer(vertical move) and width/height of image should be larger than that of AdjointContainer(horizontal move).

lib provides VerticalMoveStyle and HoriMoveStyle..A new style can be created by implement AdStyle.

Step 1

Code in layout

...<sth like scrollview>... <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="#66ffffff"

android:orientation="horizontal"

android:padding="10dp">
  <com.cysion.adjointlib.view.AdjointContainer

android:id="@+id/container"

android:layout_width="180dp"

android:layout_height="100dp"

android:layout_gravity="center_horizontal"

android:layout_margin="10dp"

>

<com.cysion.adjointlib.view.AdjointImageView

 android:id="@+id/img_holder_img"

 android:layout_width="match_parent"

 android:layout_height="wrap_content"

 android:adjustViewBounds="true"

 android:background="#99ff0000"

 android:padding="3dp"

 />
  </com.cysion.adjointlib.view.AdjointContainer>
  ...other view... </LinearLayout> ...</sth like scrollview>... 

Step 2

Set scroll View's location in Rect and provide a locator for AdjointContainer.

public class SecondActivity extends AppCompatActivity implements Locator{

 @Override
  protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

...
mContainer1 = (AdjointContainer) findViewById(R.id.adcontainer1);

mScrollView.post(new Runnable() {

 @Override

 public void run() {

  mScrollView.getGlobalVisibleRect(mR);

  mContainer1.setLocator(SecondActivity.this);

}

}
);
 .. 
}
  @Override
  public Rect getLocation() {

return mR;
  
}
  ... 
}
 

Step 3

create an obj of AdjointStyle and add it to the container.

 AdjointStyle style= new VerticalMoveStyle().minScale(0.9f);
  mContainer1.addStyle(style);

and now when parent scrolls, the image scrolls too.

Alpha/Scale

View(s) to show these effect should be wrapped in AdjointContainer.

From version 1.3.0 ,OnReachMiddleCallBack was provided for getting the middle item;

AdStyle' config:

Step 1

Code in layout

<ScrollView
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/scroller"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  >

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

 <com.cysion.adjointlib.view.AdjointContainer

 android:id="@+id/adcontainer1"

 android:layout_width="match_parent"

 android:layout_height="wrap_content"

 android:layout_marginBottom="10dp">

  <com.cysion.adjointlib.view.AdjointImageView

  android:id="@+id/img_ad1"

  android:layout_width="match_parent"

  android:layout_height="wrap_content"

  android:adjustViewBounds="true"

  android:src="@mipmap/p1c"/>

  <TextView

  android:layout_width="wrap_content"

  android:layout_height="40dp"

  android:layout_alignParentBottom="true"

  android:layout_below="@+id/img_ad1"

  android:layout_centerHorizontal="true"

  android:text="Hello world"

  android:textColor="@color/colorPrimary"

  android:textSize="24sp"/>

</com.cysion.adjointlib.view.AdjointContainer>
....../other view.....
....../other view.....
....../other view.....
....../other view.....
  </LinearLayout>  </ScrollView>  

Step 2

Just like step2 in Parallex-step2.

Step 3

create one or more obj of AdjointStyle and add it to the container.

AdjointStyle style= new VerticalMoveStyle().minScale(0.9f);
 AdjointStyle style2= new VerticalAlphaStyle();
 ..  mContainer1.addStyle(style);
  mContainer1.addStyle(style2);
 ..

and now when parent scrolls, the image will change its alpha or scale.

Refer to sample app for more detail.

License

Copyright 2017 CysionLiu  Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License. You may obtain a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.