Android开发----动画

逐帧动画补间动画属性动画 逐帧动画 关键语句

获取动画的Drwable资源AnimationDrawable anim=(AnimationDrawable)relativeLayout.getBackground();
启动动画anim.start()
停止动画anim.stop()

首先在drawable中放入图片素材并且new一个DrawableResourceFile
里面填写代码

item中的drawable属性填写图片的位置,duration代表每过多少毫秒跳转下一张图片
界面代码为:

java代码为:

package com.example.myanim;

import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.RelativeLayout;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private  boolean flag=true;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RelativeLayout relativeLayout=findViewById(R.id.anim);
        //获取drwable资源
        final AnimationDrawable anim=(AnimationDrawable)relativeLayout.getBackground();
        relativeLayout.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {
                if(flag){
                    anim.start();
                    flag=false;
                }else{
                    anim.stop();
                    flag=true;
                }
            }
        });
    }
}

帧动画的练习就完成,由于是动画不好将运行结果放入到文章中,总之帧动画练习完成!!!

alpha 透明度rotate 旋转scale 缩放translate 平移

首先res中创个文件夹anim并且在该文件夹中创建DrawableResourceFile

界面
随便拿一张图片作为练习素材

alpha

scale

rotate

translate

duration表示运行该动画所花费时长(毫秒)

Java代码:

package com.example.myanim;

import android.graphics.drawable.AnimationDrawable;
import android.media.Image;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
      	final ImageView imageview =findViewById(R.id.iv);
        imageview.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //通过加载xml动画设置文件来创建一个Animation对象
//                Animation animation=AnimationUtils.loadAnimation(MainActivity.this,R.anim.alpha);//透明度

//                Animation animation=AnimationUtils.loadAnimation(MainActivity.this,R.anim.rotate);//旋转

//                Animation animation=AnimationUtils.loadAnimation(MainActivity.this,R.anim.scale);//缩放

                Animation animation=AnimationUtils.loadAnimation(MainActivity.this,R.anim.translate);//平移
                imageview.startAnimation(animation);
            }
        });
    }
}

补间动画的练习就ojbk…

package com.example.myanim;

import android.animation.ValueAnimator;
import android.graphics.drawable.AnimationDrawable;
import android.media.Image;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //属性动画
        ValueAnimator valueAnimator=ValueAnimator.ofFloat(0f,1f);
        valueAnimator.setDuration(2000);
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                float val=(float)valueAnimator.getAnimatedValue();
                Log.e("属性动画","值="+val);
            }
        });
        valueAnimator.start();

    }
}

最终效果花费2s打印0~1的小数值

此处只展示打印部分数值…这就是ValueAnimator的应用~

xml

java

 TextView text=findViewById(R.id.tv);
        ObjectAnimator objectAnimator=ObjectAnimator.ofFloat(text,"alpha",0f,1f);
        objectAnimator.setDuration(3000);
        objectAnimator.start();

最终会将"csdn博客认证:碰磕从透明度0显示到1"
这就是ObjectAnimator的应用…ok

objectAnimator.addListener(new Animator.AnimatorListener() {
            //动画开始
            @Override
            public void onAnimationStart(Animator animator) {

            }
            //动画结束
            @Override
            public void onAnimationEnd(Animator animator) {

            }
            //动画被取消
            @Override
            public void onAnimationCancel(Animator animator) {

            }
            //动画重复执行
            @Override
            public void onAnimationRepeat(Animator animator) {

            }
        });