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AndroidGradientUI library can help you to create transition of UI gradually.

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Quick Setup

1. Include library

Using AndroidStudio

Edit your build.gradle file and add below dependency:

dependencies {
    compile 'com.david.gradientuilib:gradientuilibrary:1.0.1'
}

2. Using in layout.xml

GradientIconView

First the custom attribute should declare in xml like this:

xmlns:app="http://schemas.android.com/apk/res-auto"

Then you can add GradientIconView in layout.xml

<com.david.gradientuilibrary.GradientIconView
    android:id="@+id/id_iconfont_chat"
    app:bottom_icon="@mipmap/chats"
    app:top_icon="@mipmap/chats_green"
    android:layout_width="40dp"
    android:layout_height="35dp" />

The GradientIconView can gradient change itself from top_icon to bottom_icon. GradientIconView will show top icon completely like this:

gradientIconView.setIconAlpha(1.0f);

And it will show bottom icon completely like this:

gradientIconView.setIconAlpha(0);

GradientTextView

You can add GradientTextView in layout.xml like this.

<com.david.gradientuilibrary.GradientTextView
    android:id="@+id/id_chats_tv"
    app:bottom_text_color="@color/tab_text_gray"
    app:text="@string/chats"
    app:text_size="12sp"
    app:top_text_color="@color/tab_bg_green"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

The GradientTextView can gradient change itself textcolor from top_text_color to bottom_text_color. GradientIconView will show top textcolor completely like this:

gradientTextView.setTextViewAlpha(1.0f);

And it will show bottom textcolor completely like this:

gradientTextView.setTextViewAlpha(0);

3. Running effect

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AndroidGradientUI library can help you to create transition of UI gradually.

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