AlphaAnimation渐变动画Demo

最新推荐文章于 2021-02-21 09:08:02 发布

原创最新推荐文章于 2021-02-21 09:08:02 发布 · 365 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#Alphaanimation #渐变动画

View 专栏收录该内容

56 篇文章

订阅专栏

本文详细介绍了如何在Java中实现动画，包括直接在代码中使用AlphaAnimation进行动画效果设置，以及通过XML文件配置动画效果。演示了如何在Android应用中为按钮添加淡入淡出的动画，提供了完整的代码示例。

一、直接在java中实现动画：

package com.jikexueyuan.alphaanimation;

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AlphaAnimation;
import android.view.animation.AnimationUtils;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		if (savedInstanceState == null) {
			getFragmentManager().beginTransaction()
			.add(R.id.container, new PlaceholderFragment())
			.commit();
		}
	}

	public static class PlaceholderFragment extends Fragment {

		public PlaceholderFragment() {
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			View view= inflater.inflate(R.layout.fragment_main, container, false);
			view.findViewById(R.id.btnAnimMe).setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View arg0) {
					   AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1);  //起始动画透明度
					   alphaAnimation.setDuration(1000);  //动画时间
					   arg0.startAnimation(alphaAnimation);
				}
			});
			return view;
		}
	}
}

二、通过编写xml实现动画：

package com.jikexueyuan.alphaanimation;

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		if (savedInstanceState == null) {
			getFragmentManager().beginTransaction()
			.add(R.id.container, new PlaceholderFragment())
			.commit();
		}
	}

	public static class PlaceholderFragment extends Fragment {

		public PlaceholderFragment() {
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			View view= inflater.inflate(R.layout.fragment_main, container, false);
			view.findViewById(R.id.btnAnimMe).setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View arg0) {
					arg0.startAnimation(AnimationUtils.loadAnimation(getActivity(), R.anim.aa));//通过aa.xml来配置动画效果
				}
			});
			return view;
		}
	}

}

aa.xml:

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromAlpha="0"  //动画开始的透明度
    android:toAlpha="1"    //动画结束的透明度
    android:duration="1000" >    //动画持续时间

</alpha>