14日 7月 2017

    [Android]Color gradation and rounding corners

    [日本語]

     

    I will introduce how to set gradation on a background color of View and round corners of View and on Android.

     

    Environment：Android Studio 2.2.1, API 19

      

    Use GradientDrawable for setting color gradation and rounding corners.

    Set gradient colors to GradientDrawable's argument and declare gradation direction using Orientation.

    GradientDrawable gradient = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, new int[]{Color.BLUE, Color.WHITE});

    Use setCornerRadius for rounding corners of View.

    gradient.setCornerRadius(5);

    Use setCornerRadius for rounding corners of View.

    private Button buttonSample = new Button(this);

    buttonSample.setBackground(gradient);

     

    [Sample Code]

    package net.studioks.sample1;

     

    import android.app.Activity;

    import android.graphics.Color;

    import android.graphics.drawable.GradientDrawable;

    import android.os.Bundle;

    import android.widget.Button;

    import android.widget.RelativeLayout;

     

    public class sample1 extends Activity {

    　　private Button buttonSample;

     

    　　@Override

    　　public void onCreate(Bundle bundle){

    　　　　super.onCreate(bundle);

    　　　　RelativeLayout relativeLayout = new RelativeLayout(this);

    　　　　setContentView(relativeLayout);

    　　　　buttonSample = new Button(this);

    　　　　buttonSample.setText("Sample");

    　　　　buttonSample.setTextColor(Color.WHITE);

    　　　　buttonSample.setPadding(0,0,0,0);

    　　　　GradientDrawable gradient = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, new int[]{Color.BLUE, Color.WHITE});

    　　　　gradient.setCornerRadius(5);

    　　　　buttonSample.setBackground(gradient);

    　　　　RelativeLayout.LayoutParams param = new RelativeLayout.LayoutParams(100, 50);

    　　　　param.leftMargin = 20;

    　　　　param.topMargin = 10;

    　　　　param.addRule(RelativeLayout.ALIGN_TOP);

    　　　　relativeLayout.addView(buttonSample,param);

    　　}

    }

    カテゴリ： english, android programming-201701