Android 动画

帧动画

动画的启动和停止

获取动画的 Drawable资源

AnimationDrawable anim = (AnimationDrawable)relativeLayout.getBackground();

//启动动画
- ```
anim.start();
```
停止动画
- ```
anim.stop();
```

得到frame帧布局

<animation-list xmlns:android="http://schemas.android.com/apk/res/android">

<item android:drawable="@drawable/meinv" android:duration="120"/>
<item android:drawable="@drawable/meinv2" android:duration="120"/>
<item android:drawable="@drawable/meinv3" android:duration="120"/>
<item android:drawable="@drawable/meinv4" android:duration="120"/>

</animation-list>

创建RelativeLayout 布局

<RelativeLayout
    android:id="@+id/rl"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:background="@drawable/frame"
    xmlns:android="http://schemas.android.com/apk/res/android" />

设置点击开始和结束

private boolean flag;

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

        RelativeLayout relativeLayout = findViewById(R.id.rl);
        final AnimationDrawable animationDrawable = (AnimationDrawable) relativeLayout.getBackground();

        relativeLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if(flag){
                    animationDrawable.start();
                }else {
                    animationDrawable.stop();
                    flag = true;
                }
            }
        });
    }

补间动画

alpha 透明度
ratate 旋转
scale 缩放
translate 平移

alpha

设置alpha动画

<alpha
    android:fromAlpha="0"
    android:toAlpha="1"
    android:duration = "2000"
    />

设置动画图片

<ImageView
        android:id="@+id/iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:adjustViewBounds="true"
        android:maxWidth="300dp"
        android:maxHeight="300dp"
        android:src="@drawable/meinv"/>

设置点击事件

imageview = findViewById(R.id.iv);

imageview.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // 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);
        imageview.startAnimation(animation);
    }
});

rotate

设置rotate布局

<rotate
        android:duration = "2000"
        android:fromDegrees="0"
        android:toDegrees="360"
        android:pivotX="50%"
        android:pivotY="50%"
        />

设置点击事件

imageview = findViewById(R.id.iv);

imageview.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // 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.rotate);
        imageview.startAnimation(animation);
    }
});

scale

设置scale帧

<scale
        android:fromXScale="1"
        android:fromYScale="1"
        android:toXScale="0.5"
        android:toYScale="0.5"
        android:pivotY="50%"
        android:pivotX="50%"
        android:duration="2000"
        />

translate

设置布局

<translate

    android:fromXDelta="0"
    android:fromYDelta="0"
    android:toXDelta="400"
    android:toYDelta="400"
    android:duration = "2000"
    />

属性动画

ValueAnimator

改变animator值的

ValueAnimator valueAnimator = ValueAnimator.ofFloat(0f,1f);
        valueAnimator.setDuration(2000);
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float value = (float)animation.getAnimatedValue();
                Log.e("leo","onAnimationUpdate" + value);
            }
        });
        valueAnimator.start();

ObjectAnimator

继承 ValueAnimator 可以直接针对对象控制控件

设置图片控件

<ImageView
    android:id="@+id/iv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:adjustViewBounds="true"
    android:maxWidth="300dp"
    android:maxHeight="300dp"
    android:src="@drawable/meinv"/>

设置图片渐进

ImageView imageView = findViewById(R.id.iv);
        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(imageView,"alpha", 0f,1f );
        objectAnimator.setDuration(4000);
        objectAnimator.start();

监听器

onAnimationStart() 动画开始的时候调用
onAnimationEnd() 动画结束的时候调用
onAnimationCancel() 动画被取消的时候调用

onAnimationRepeat() 动画重复执行的时候调用

objectAnimator.addListener(new Animator.AnimatorListener() {
    @Override
    public void onAnimationStart(Animator animation) {

    }

    @Override
    public void onAnimationEnd(Animator animation) {

    }

    @Override
    public void onAnimationCancel(Animator animation) {

    }

    @Override
    public void onAnimationRepeat(Animator animation) {

    }
});

objectAnimator.addListener(new AnimatorListenerAdapter() {
    @Override
    public void onAnimationStart(Animator animation) {
        super.onAnimationStart(animation);
    }
});