How to Implement Coordinator Behavior in Android Studio.
Creating New Project.
Open android studio and create a new project.
File => New => New Project => Configure your new project => Select the form factor yours app will run on => Add an Activity to Mobile => Customize the Activity => Finish.
First we need to add Library to our project.
compile 'com.android.support:design:23.2.1'
compile 'com.android.support:cardview-v7:23.2.1'
compile 'de.hdodenhof:circleimageview:1.3.0'
Create Xml file in project.
Open => app => res => layout - activity_main.xml.
<android.support.design.widget.CoordinatorLayout
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"
tools:ignore="RtlHardcoded"
>
<android.support.design.widget.AppBarLayout
android:id="@+id/main.appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
>
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/main.collapsing"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
>
<ImageView
android:id="@+id/main.imageview.placeholder"
android:layout_width="match_parent"
android:layout_height="300dp"
android:scaleType="centerCrop"
android:src="@drawable/icon_background"
android:tint="#11000000"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.9"
/>
<FrameLayout
android:id="@+id/main.framelayout.title"
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_gravity="bottom|center_horizontal"
android:background="#FF387E8B"
android:orientation="vertical"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.3"
>
<LinearLayout
android:id="@+id/main.linearlayout.title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="6dp"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:gravity="bottom|center"
android:text="Arun Kumar Choudhary"
android:textColor="@android:color/white"
android:textSize="16sp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Software Developer"
android:textSize="14dp"
android:textColor="@android:color/white"
/>
</LinearLayout>
</FrameLayout>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
app:behavior_overlapTop="30dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<android.support.v7.widget.CardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="12dp"
app:cardElevation="8dp"
app:contentPadding="16dp"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:lineSpacingExtra="8dp"
android:text="@string/decription"
android:textSize="18sp"
/>
</android.support.v7.widget.CardView>
</android.support.v4.widget.NestedScrollView>
<android.support.v7.widget.Toolbar
android:id="@+id/main.toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#FF387E8B"
app:layout_anchor="@id/main.framelayout.title"
app:theme="@style/ThemeOverlay.AppCompat.Dark"
app:title="">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal" >
<Space
android:layout_width="@dimen/image_final_width"
android:layout_height="@dimen/image_final_width"
/>
<TextView
android:id="@+id/main.textview.title"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="8dp"
android:gravity="center_vertical"
android:text="Android Developer"
android:textColor="@android:color/white"
android:textSize="20sp"
/>
</LinearLayout>
</android.support.v7.widget.Toolbar>
<de.hdodenhof.circleimageview.CircleImageView
android:layout_width="@dimen/image_width"
android:layout_height="@dimen/image_width"
android:layout_gravity="center_horizontal"
android:src="@drawable/icon_background"
app:border_color="@android:color/white"
app:border_width="2dp"
app:finalHeight="@dimen/image_final_width"
app:finalYPosition="2dp"
app:layout_behavior="saulmm.myapplication.ImageBehavior"
app:startHeight="2dp"
app:startToolbarPosition="2dp"
android:layout_marginBottom="12dp"
app:startXPosition="2dp"
/>
</android.support.design.widget.CoordinatorLayout>
Create the Java file in project.
Open app => main => src = MainActivity.java
import android.os.Bundle;
import android.support.design.widget.AppBarLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements AppBarLayout.OnOffsetChangedListener {
private static final float PERCENTAGE_TO_SHOW_TITLE_AT_TOOLBAR = 0.9f;
private static final float PERCENTAGE_TO_HIDE_TITLE_DETAILS = 0.3f;
private static final int ALPHA_ANIMATIONS_DURATION = 200;
private boolean mIsTheTitleVisible = false;
private boolean mIsTheTitleContainerVisible = true;
private LinearLayout mTitleContainer;
private TextView mTitle;
private AppBarLayout mAppBarLayout;
private Toolbar mToolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bindActivity();
mAppBarLayout.addOnOffsetChangedListener(this);
mToolbar.inflateMenu(R.menu.menu_main);
startAlphaAnimation(mTitle, 0, View.INVISIBLE);
}
private void bindActivity() {
mToolbar = (Toolbar) findViewById(R.id.main_toolbar);
mTitle = (TextView) findViewById(R.id.main_textview_title);
mTitleContainer = (LinearLayout) findViewById(R.id.main_linearlayout_title);
mAppBarLayout = (AppBarLayout) findViewById(R.id.main_appbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public void onOffsetChanged(AppBarLayout appBarLayout, int offset) {
int maxScroll = appBarLayout.getTotalScrollRange();
float percentage = (float) Math.abs(offset) / (float) maxScroll;
handleAlphaOnTitle(percentage);
handleToolbarTitleVisibility(percentage);
}
private void handleToolbarTitleVisibility(float percentage) {
if (percentage >= PERCENTAGE_TO_SHOW_TITLE_AT_TOOLBAR) {
if(!mIsTheTitleVisible) {
startAlphaAnimation(mTitle, ALPHA_ANIMATIONS_DURATION, View.VISIBLE);
mIsTheTitleVisible = true;
}
} else {
if (mIsTheTitleVisible) {
startAlphaAnimation(mTitle, ALPHA_ANIMATIONS_DURATION, View.INVISIBLE);
mIsTheTitleVisible = false;
}
}
}
private void handleAlphaOnTitle(float percentage) {
if (percentage >= PERCENTAGE_TO_HIDE_TITLE_DETAILS) {
if(mIsTheTitleContainerVisible) {
startAlphaAnimation(mTitleContainer, ALPHA_ANIMATIONS_DURATION, View.INVISIBLE);
mIsTheTitleContainerVisible = false;
}
} else {
if (!mIsTheTitleContainerVisible) {
startAlphaAnimation(mTitleContainer, ALPHA_ANIMATIONS_DURATION, View.VISIBLE);
mIsTheTitleContainerVisible = true;
}
}
}
public static void startAlphaAnimation (View v, long duration, int visibility) {
AlphaAnimation alphaAnimation = (visibility == View.VISIBLE)
? new AlphaAnimation(0f, 1f)
: new AlphaAnimation(1f, 0f);
alphaAnimation.setDuration(duration);
alphaAnimation.setFillAfter(true);
v.startAnimation(alphaAnimation);
}
}
Create the Java file in project.
Open app => main => src = ImageBehavior.java
import android.content.Context;
import android.content.res.TypedArray;
import android.support.design.widget.CoordinatorLayout;
import android.support.v7.widget.Toolbar;
import android.util.AttributeSet;
import android.view.View;
import de.hdodenhof.circleimageview.CircleImageView;
@SuppressWarnings("unused")
public class ImageBehavior extends CoordinatorLayout.Behavior<CircleImageView> {
private final static float MIN_AVATAR_PERCENTAGE_SIZE = 0.3f;
private final static int EXTRA_FINAL_AVATAR_PADDING = 80;
private final static String TAG = "behavior";
private Context mContext;
private float mCustomFinalYPosition;
private float mCustomStartXPosition;
private float mCustomStartToolbarPosition;
private float mCustomStartHeight;
private float mCustomFinalHeight;
private float mAvatarMaxSize;
private float mFinalLeftAvatarPadding;
private float mStartPosition;
private int mStartXPosition;
private float mStartToolbarPosition;
private int mStartYPosition;
private int mFinalYPosition;
private int mStartHeight;
private int mFinalXPosition;
private float mChangeBehaviorPoint;
public ImageBehavior(Context context, AttributeSet attrs) {
mContext = context;
if (attrs != null) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ImageBehavior);
mCustomFinalYPosition = a.getDimension(R.styleable.ImageBehavior_finalYPosition, 0);
mCustomStartXPosition = a.getDimension(R.styleable.ImageBehavior_startXPosition, 0);
mCustomStartToolbarPosition = a.getDimension(R.styleable.ImageBehavior_startToolbarPosition, 0);
mCustomStartHeight = a.getDimension(R.styleable.ImageBehavior_startHeight, 0);
mCustomFinalHeight = a.getDimension(R.styleable.ImageBehavior_finalHeight, 0);
a.recycle();
}
init();
mFinalLeftAvatarPadding = context.getResources().getDimension(
R.dimen.spacing_normal);
}
private void init() {
bindDimensions();
}
private void bindDimensions() {
mAvatarMaxSize = mContext.getResources().getDimension(R.dimen.image_width);
}
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, CircleImageView child, View dependency) {
return dependency instanceof Toolbar;
}
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, CircleImageView child, View dependency) {
maybeInitProperties(child, dependency);
final int maxScrollDistance = (int) (mStartToolbarPosition);
float expandedPercentageFactor = dependency.getY() / maxScrollDistance;
if (expandedPercentageFactor < mChangeBehaviorPoint) {
float heightFactor = (mChangeBehaviorPoint - expandedPercentageFactor) / mChangeBehaviorPoint;
float distanceXToSubtract = ((mStartXPosition - mFinalXPosition)
* heightFactor) + (child.getHeight()/2);
float distanceYToSubtract = ((mStartYPosition - mFinalYPosition)
* (1f - expandedPercentageFactor)) + (child.getHeight()/2);
child.setX(mStartXPosition - distanceXToSubtract);
child.setY(mStartYPosition - distanceYToSubtract);
float heightToSubtract = ((mStartHeight - mCustomFinalHeight) * heightFactor);
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) child.getLayoutParams();
lp.width = (int) (mStartHeight - heightToSubtract);
lp.height = (int) (mStartHeight - heightToSubtract);
child.setLayoutParams(lp);
} else {
float distanceYToSubtract = ((mStartYPosition - mFinalYPosition)
* (1f - expandedPercentageFactor)) + (mStartHeight/2);
child.setX(mStartXPosition - child.getWidth()/2);
child.setY(mStartYPosition - distanceYToSubtract);
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) child.getLayoutParams();
lp.width = (int) (mStartHeight);
lp.height = (int) (mStartHeight);
child.setLayoutParams(lp);
}
return true;
}
private void maybeInitProperties(CircleImageView child, View dependency) {
if (mStartYPosition == 0)
mStartYPosition = (int) (dependency.getY());
if (mFinalYPosition == 0)
mFinalYPosition = (dependency.getHeight() /2);
if (mStartHeight == 0)
mStartHeight = child.getHeight();
if (mStartXPosition == 0)
mStartXPosition = (int) (child.getX() + (child.getWidth() / 2));
if (mFinalXPosition == 0)
mFinalXPosition = mContext.getResources().getDimensionPixelOffset(R.dimen.abc_action_bar_content_inset_material) + ((int) mCustomFinalHeight / 2);
if (mStartToolbarPosition == 0)
mStartToolbarPosition = dependency.getY();
if (mChangeBehaviorPoint == 0) {
mChangeBehaviorPoint = (child.getHeight() - mCustomFinalHeight) / (2f * (mStartYPosition - mFinalYPosition));
}
}
public int getStatusBarHeight() {
int result = 0;
int resourceId = mContext.getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = mContext.getResources().getDimensionPixelSize(resourceId);
}
return result;
}
}
Add some xml file in values folder.
attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="ImageBehavior">
<attr name="finalYPosition" format="dimension"/>
<attr name="startXPosition" format="dimension"/>
<attr name="startToolbarPosition" format="dimension"/>
<attr name="startHeight" format="dimension"/>
<attr name="finalHeight" format="dimension"/>
</declare-styleable>
</resources>
string.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- strings -->
<string name="app_name">CoordinatorDemo</string>
<string name="decription">enter the description here</string>
<!-- colors -->
<color name="primary">#785447</color>
<color name="primaryDark">#5B3F36</color>
<!-- dimensions -->
<dimen name="image_width">120dp</dimen>
<dimen name="image_final_width">32dp</dimen>
<dimen name="spacing_normal">16dp</dimen>
<!-- styles -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">@color/primary</item>
<item name="colorPrimaryDark">@color/primaryDark</item>
</style>
</resources>
Add some xml file in menu folder.
menu_main.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MainActivity">
<item android:id="@+id/menu_share"
android:icon="@mipmap/ic_launcher"
app:showAsAction="always"
android:title="Favorite" />
</menu>
Screen:-
Creating New Project.
Open android studio and create a new project.
File => New => New Project => Configure your new project => Select the form factor yours app will run on => Add an Activity to Mobile => Customize the Activity => Finish.
First we need to add Library to our project.
compile 'com.android.support:design:23.2.1'
compile 'com.android.support:cardview-v7:23.2.1'
compile 'de.hdodenhof:circleimageview:1.3.0'
Create Xml file in project.
Open => app => res => layout - activity_main.xml.
<android.support.design.widget.CoordinatorLayout
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"
tools:ignore="RtlHardcoded"
>
<android.support.design.widget.AppBarLayout
android:id="@+id/main.appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
>
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/main.collapsing"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
>
<ImageView
android:id="@+id/main.imageview.placeholder"
android:layout_width="match_parent"
android:layout_height="300dp"
android:scaleType="centerCrop"
android:src="@drawable/icon_background"
android:tint="#11000000"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.9"
/>
<FrameLayout
android:id="@+id/main.framelayout.title"
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_gravity="bottom|center_horizontal"
android:background="#FF387E8B"
android:orientation="vertical"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.3"
>
<LinearLayout
android:id="@+id/main.linearlayout.title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="6dp"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:gravity="bottom|center"
android:text="Arun Kumar Choudhary"
android:textColor="@android:color/white"
android:textSize="16sp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Software Developer"
android:textSize="14dp"
android:textColor="@android:color/white"
/>
</LinearLayout>
</FrameLayout>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
app:behavior_overlapTop="30dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<android.support.v7.widget.CardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="12dp"
app:cardElevation="8dp"
app:contentPadding="16dp"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:lineSpacingExtra="8dp"
android:text="@string/decription"
android:textSize="18sp"
/>
</android.support.v7.widget.CardView>
</android.support.v4.widget.NestedScrollView>
<android.support.v7.widget.Toolbar
android:id="@+id/main.toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#FF387E8B"
app:layout_anchor="@id/main.framelayout.title"
app:theme="@style/ThemeOverlay.AppCompat.Dark"
app:title="">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal" >
<Space
android:layout_width="@dimen/image_final_width"
android:layout_height="@dimen/image_final_width"
/>
<TextView
android:id="@+id/main.textview.title"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="8dp"
android:gravity="center_vertical"
android:text="Android Developer"
android:textColor="@android:color/white"
android:textSize="20sp"
/>
</LinearLayout>
</android.support.v7.widget.Toolbar>
<de.hdodenhof.circleimageview.CircleImageView
android:layout_width="@dimen/image_width"
android:layout_height="@dimen/image_width"
android:layout_gravity="center_horizontal"
android:src="@drawable/icon_background"
app:border_color="@android:color/white"
app:border_width="2dp"
app:finalHeight="@dimen/image_final_width"
app:finalYPosition="2dp"
app:layout_behavior="saulmm.myapplication.ImageBehavior"
app:startHeight="2dp"
app:startToolbarPosition="2dp"
android:layout_marginBottom="12dp"
app:startXPosition="2dp"
/>
</android.support.design.widget.CoordinatorLayout>
Create the Java file in project.
Open app => main => src = MainActivity.java
import android.os.Bundle;
import android.support.design.widget.AppBarLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements AppBarLayout.OnOffsetChangedListener {
private static final float PERCENTAGE_TO_SHOW_TITLE_AT_TOOLBAR = 0.9f;
private static final float PERCENTAGE_TO_HIDE_TITLE_DETAILS = 0.3f;
private static final int ALPHA_ANIMATIONS_DURATION = 200;
private boolean mIsTheTitleVisible = false;
private boolean mIsTheTitleContainerVisible = true;
private LinearLayout mTitleContainer;
private TextView mTitle;
private AppBarLayout mAppBarLayout;
private Toolbar mToolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bindActivity();
mAppBarLayout.addOnOffsetChangedListener(this);
mToolbar.inflateMenu(R.menu.menu_main);
startAlphaAnimation(mTitle, 0, View.INVISIBLE);
}
private void bindActivity() {
mToolbar = (Toolbar) findViewById(R.id.main_toolbar);
mTitle = (TextView) findViewById(R.id.main_textview_title);
mTitleContainer = (LinearLayout) findViewById(R.id.main_linearlayout_title);
mAppBarLayout = (AppBarLayout) findViewById(R.id.main_appbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public void onOffsetChanged(AppBarLayout appBarLayout, int offset) {
int maxScroll = appBarLayout.getTotalScrollRange();
float percentage = (float) Math.abs(offset) / (float) maxScroll;
handleAlphaOnTitle(percentage);
handleToolbarTitleVisibility(percentage);
}
private void handleToolbarTitleVisibility(float percentage) {
if (percentage >= PERCENTAGE_TO_SHOW_TITLE_AT_TOOLBAR) {
if(!mIsTheTitleVisible) {
startAlphaAnimation(mTitle, ALPHA_ANIMATIONS_DURATION, View.VISIBLE);
mIsTheTitleVisible = true;
}
} else {
if (mIsTheTitleVisible) {
startAlphaAnimation(mTitle, ALPHA_ANIMATIONS_DURATION, View.INVISIBLE);
mIsTheTitleVisible = false;
}
}
}
private void handleAlphaOnTitle(float percentage) {
if (percentage >= PERCENTAGE_TO_HIDE_TITLE_DETAILS) {
if(mIsTheTitleContainerVisible) {
startAlphaAnimation(mTitleContainer, ALPHA_ANIMATIONS_DURATION, View.INVISIBLE);
mIsTheTitleContainerVisible = false;
}
} else {
if (!mIsTheTitleContainerVisible) {
startAlphaAnimation(mTitleContainer, ALPHA_ANIMATIONS_DURATION, View.VISIBLE);
mIsTheTitleContainerVisible = true;
}
}
}
public static void startAlphaAnimation (View v, long duration, int visibility) {
AlphaAnimation alphaAnimation = (visibility == View.VISIBLE)
? new AlphaAnimation(0f, 1f)
: new AlphaAnimation(1f, 0f);
alphaAnimation.setDuration(duration);
alphaAnimation.setFillAfter(true);
v.startAnimation(alphaAnimation);
}
}
Create the Java file in project.
Open app => main => src = ImageBehavior.java
import android.content.Context;
import android.content.res.TypedArray;
import android.support.design.widget.CoordinatorLayout;
import android.support.v7.widget.Toolbar;
import android.util.AttributeSet;
import android.view.View;
import de.hdodenhof.circleimageview.CircleImageView;
@SuppressWarnings("unused")
public class ImageBehavior extends CoordinatorLayout.Behavior<CircleImageView> {
private final static float MIN_AVATAR_PERCENTAGE_SIZE = 0.3f;
private final static int EXTRA_FINAL_AVATAR_PADDING = 80;
private final static String TAG = "behavior";
private Context mContext;
private float mCustomFinalYPosition;
private float mCustomStartXPosition;
private float mCustomStartToolbarPosition;
private float mCustomStartHeight;
private float mCustomFinalHeight;
private float mAvatarMaxSize;
private float mFinalLeftAvatarPadding;
private float mStartPosition;
private int mStartXPosition;
private float mStartToolbarPosition;
private int mStartYPosition;
private int mFinalYPosition;
private int mStartHeight;
private int mFinalXPosition;
private float mChangeBehaviorPoint;
public ImageBehavior(Context context, AttributeSet attrs) {
mContext = context;
if (attrs != null) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ImageBehavior);
mCustomFinalYPosition = a.getDimension(R.styleable.ImageBehavior_finalYPosition, 0);
mCustomStartXPosition = a.getDimension(R.styleable.ImageBehavior_startXPosition, 0);
mCustomStartToolbarPosition = a.getDimension(R.styleable.ImageBehavior_startToolbarPosition, 0);
mCustomStartHeight = a.getDimension(R.styleable.ImageBehavior_startHeight, 0);
mCustomFinalHeight = a.getDimension(R.styleable.ImageBehavior_finalHeight, 0);
a.recycle();
}
init();
mFinalLeftAvatarPadding = context.getResources().getDimension(
R.dimen.spacing_normal);
}
private void init() {
bindDimensions();
}
private void bindDimensions() {
mAvatarMaxSize = mContext.getResources().getDimension(R.dimen.image_width);
}
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, CircleImageView child, View dependency) {
return dependency instanceof Toolbar;
}
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, CircleImageView child, View dependency) {
maybeInitProperties(child, dependency);
final int maxScrollDistance = (int) (mStartToolbarPosition);
float expandedPercentageFactor = dependency.getY() / maxScrollDistance;
if (expandedPercentageFactor < mChangeBehaviorPoint) {
float heightFactor = (mChangeBehaviorPoint - expandedPercentageFactor) / mChangeBehaviorPoint;
float distanceXToSubtract = ((mStartXPosition - mFinalXPosition)
* heightFactor) + (child.getHeight()/2);
float distanceYToSubtract = ((mStartYPosition - mFinalYPosition)
* (1f - expandedPercentageFactor)) + (child.getHeight()/2);
child.setX(mStartXPosition - distanceXToSubtract);
child.setY(mStartYPosition - distanceYToSubtract);
float heightToSubtract = ((mStartHeight - mCustomFinalHeight) * heightFactor);
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) child.getLayoutParams();
lp.width = (int) (mStartHeight - heightToSubtract);
lp.height = (int) (mStartHeight - heightToSubtract);
child.setLayoutParams(lp);
} else {
float distanceYToSubtract = ((mStartYPosition - mFinalYPosition)
* (1f - expandedPercentageFactor)) + (mStartHeight/2);
child.setX(mStartXPosition - child.getWidth()/2);
child.setY(mStartYPosition - distanceYToSubtract);
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) child.getLayoutParams();
lp.width = (int) (mStartHeight);
lp.height = (int) (mStartHeight);
child.setLayoutParams(lp);
}
return true;
}
private void maybeInitProperties(CircleImageView child, View dependency) {
if (mStartYPosition == 0)
mStartYPosition = (int) (dependency.getY());
if (mFinalYPosition == 0)
mFinalYPosition = (dependency.getHeight() /2);
if (mStartHeight == 0)
mStartHeight = child.getHeight();
if (mStartXPosition == 0)
mStartXPosition = (int) (child.getX() + (child.getWidth() / 2));
if (mFinalXPosition == 0)
mFinalXPosition = mContext.getResources().getDimensionPixelOffset(R.dimen.abc_action_bar_content_inset_material) + ((int) mCustomFinalHeight / 2);
if (mStartToolbarPosition == 0)
mStartToolbarPosition = dependency.getY();
if (mChangeBehaviorPoint == 0) {
mChangeBehaviorPoint = (child.getHeight() - mCustomFinalHeight) / (2f * (mStartYPosition - mFinalYPosition));
}
}
public int getStatusBarHeight() {
int result = 0;
int resourceId = mContext.getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = mContext.getResources().getDimensionPixelSize(resourceId);
}
return result;
}
}
Add some xml file in values folder.
attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="ImageBehavior">
<attr name="finalYPosition" format="dimension"/>
<attr name="startXPosition" format="dimension"/>
<attr name="startToolbarPosition" format="dimension"/>
<attr name="startHeight" format="dimension"/>
<attr name="finalHeight" format="dimension"/>
</declare-styleable>
</resources>
string.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- strings -->
<string name="app_name">CoordinatorDemo</string>
<string name="decription">enter the description here</string>
<!-- colors -->
<color name="primary">#785447</color>
<color name="primaryDark">#5B3F36</color>
<!-- dimensions -->
<dimen name="image_width">120dp</dimen>
<dimen name="image_final_width">32dp</dimen>
<dimen name="spacing_normal">16dp</dimen>
<!-- styles -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">@color/primary</item>
<item name="colorPrimaryDark">@color/primaryDark</item>
</style>
</resources>
Add some xml file in menu folder.
menu_main.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MainActivity">
<item android:id="@+id/menu_share"
android:icon="@mipmap/ic_launcher"
app:showAsAction="always"
android:title="Favorite" />
</menu>
Screen:-
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| Add caption |
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