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   源码介绍

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package com.abto.gradients;

import android.app.Activity;
import android.graphics.drawable.LayerDrawable;
import android.os.Bundle;
import android.view.ViewTreeObserver;
import android.widget.Button;
import android.widget.RadioGroup;

public class MainActivity extends Activity{

	Button button;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main_activity);
		button = (Button) findViewById(R.id.button);
		RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radioGroup);
		radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

			@Override
			public void onCheckedChanged(RadioGroup group, int checkedId) {

				boolean pressed = false;
				boolean focused = false;
				boolean enabled = false;

				switch (checkedId) {
				case R.id.normal:
					pressed = false;
					focused = false;
					enabled = true;
					break;
				case R.id.pressed:
					pressed = true;
					focused = true;
					enabled = true;
					break;
				case R.id.focused:
					pressed = false;
					focused = true;
					enabled = true;
					break;
				case R.id.disabled:
					pressed = false;
					focused = false;
					enabled = false;
					break;
				case R.id.disabledAndFocused:
					pressed = false;
					focused = true;
					enabled = false;
					break;
				}
				
				setState(pressed, focused, enabled);
			}
		});
		
		radioGroup.check(R.id.normal);
		
	}
	
	private void setState(boolean pressed, boolean focused, boolean enabled) {
		button.setPressed(pressed);
		if (focused) {
			button.setFocusableInTouchMode(true);
			button.requestFocus();
		} else {
			button.setFocusableInTouchMode(false);
			button.clearFocus();
		}
		button.setEnabled(enabled);
	}
}