【Android】客製化有圓角的Button (不用圖片)

=======================CheckableButton.java=======================

package com.tsots.widget;

import android.content.Context;

import android.util.AttributeSet;

import android.widget.Button;

import android.widget.Checkable;

public class CheckableButton extends Button implements Checkable {

private boolean mChecked;

private static final int[] CHECKED_STATE_SET = { android.R.attr.state_checked };

public CheckableButton(Context context) {

  super(context);

}

public CheckableButton(Context context, AttributeSet attrs) {

  super(context, attrs);

}

@Override

public int[] onCreateDrawableState(int extraSpace) {

  final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);

  if (isChecked()) {

   mergeDrawableStates(drawableState, CHECKED_STATE_SET);

  }

  return drawableState;

}

@Override

public boolean isChecked() {

  return mChecked;

}

@Override

public void setChecked(boolean checked) {

  if (mChecked != checked) {

   mChecked = checked;

   refreshDrawableState();

  }

}

@Override

public void toggle() {

  setChecked(!mChecked);

}

}

=======================button_background.xml=======================

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true">

        <shape android:shape="rectangle">

            <corners android:radius="80dip" />

            <solid android:color="@color/background_selected" />

        </shape>

</item>

    <item android:state_checked="true">

        <shape android:shape="rectangle">

            <corners android:radius="80dip" />

            <solid android:color="@color/background_selected" />

        </shape>

    </item>

    <item android:state_focused="true">

        <shape android:shape="rectangle">

            <corners android:radius="80dip" />

            <solid android:color="@color/background_selected" />

        </shape>

</item>

    <item>

        <shape android:shape="rectangle">

            <corners android:radius="80dip" />

            <solid android:color="@color/background_normal" />

        </shape>

</item>

</selector>

=======================colors.xml=======================

<color name="background_normal">#1ec20d</color>                          

<color name="background_selected">#0C635B</color>

<color name="white">#FFFFFF</color>

=======================main_layout.xml=======================

<com.tsots.widget.CheckableButton

            android:id="@+id/service_btn"

            android:layout_width="120dp"

            android:layout_height="30dp"

            android:layout_centerHorizontal="true"

            android:background="@drawable/button_background"

            android:text="登入"

            android:textColor="@color/white"

            android:textSize="24dp"

            />