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HomeWeb Front-endHTML TutorialAndroid animation learning--Tween Animation_html/css_WEB-ITnose

Table of Contents

  • Table of Contents
  • Android Animation Learning
  • Tween Animation
  • scale animation to adjust size
  • alpha animation to adjust transparency
  • rotate animation to rotate
  • translate animation to translate
  • Android animation learning

    There are three types of animation in android:

    1. Tween Animation: generated by continuously performing image transformations (translation, scaling, rotation) on objects in the scene Animation effect is a gradient animation.
    2. Frame Animation: sequentially plays pre-made images, which is a kind of screen transition animation.
    3. Property Animation: Property animation, which achieves animation effects by dynamically changing the properties of objects. Property animation is a new feature of API 11.

    This blog mainly analyzes the basic use of Tween Animation.

    Tween Animation

    Tween Animation has four forms:

    1. alpha: gradient transparent animation effect.
    2. scale: Gradient size expansion and contraction animation effect.
    3. translate: Screen position movement animation effect.
    4. rotate: Screen rotation animation effect.

    These four animation implementation methods are all implemented through the combination of Animation class and AnimationUtils. Animation effects can be pre-configured in the xml file in the res/anim directory.

    Scale animation? Adjust size

    The parameters of scale are as follows:

  • android:fromXScale: The scaling ratio relative to itself in the starting X direction, Floating point value. For example, 1.0 represents no change, 0.5 represents twice the initial size, and 2.0 represents doubling the size.
  • android:toXScale: The scaling ratio relative to itself in the X direction at the end.
  • android:fromYScale: The scaling ratio relative to itself in the Y direction at the beginning.
  • android:toYScale: The scaling ratio relative to itself in the Y direction at the end.
  • android:pivotX: The X-axis coordinate of the zoom starting point, which can be in three forms: numerical value, percentage, and percentage. (Note: The starting point refers to the coordinates of the upper left corner of the current View)
  • android:pivotY: Scale the Y-axis coordinate of the starting point.
  • In addition, the Animation class is the base class for all animations (scale, alpha, translate, rotate). Properties inherited from the Animation class:

  • android:duration: animation duration in milliseconds unit.
  • android:fillAfter: If set to true, when the control animation ends, the last state of the animation will be maintained.
  • android:fillBefore: If set to true, after the control animation ends, it will be restored to the state before the startup animation.
  • android:fillEnabled: has the same effect as android:fillBefore, both restore the control to its initial state at the end of the animation.
  • android:repeatCount: Number of repetitions
  • android:repeatMode: Repeat type, with two values: reverse and restart. Reverse means playback in reverse order, and restart means playback again.
  • Talking without practice is not enough. Here are an anim xml file, a layout file and an Activity class to practice the use of scale animation.

    res/anim/anim_scale.xml file is as follows:

    <?xml version="1.0" encoding="utf-8"?><scale xmlns:android="http://schemas.android.com/apk/res/android" android:duration="700" android:fromXScale="0.0" android:fromYScale="0.0" android:pivotX="150" android:pivotY="300" android:toXScale="1.4" android:toYScale="1.4" android:fillAfter="true" android:repeatCount="10" android:repeatMode="reverse"></scale>

    res/layout/tween_animation_layout.xml file is as follows:

    <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" >    <LinearLayout  android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" >        <Button  android:id="@+id/alpha_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="@string/alpha" />        <Button  android:id="@+id/scale_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="@string/scale" />        <Button  android:id="@+id/rotate_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="@string/rotate" />        <Button  android:id="@+id/trans_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="@string/trans" />    </LinearLayout>    <ImageView  android:id="@+id/anim_image" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:contentDescription="@null" android:src="@drawable/splash_logo" /></LinearLayout>

    Animation demonstration implementation class is implemented as follows :

    import com.example.photocrop.R;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.widget.Button;import android.widget.ImageView;public class TweenAnimationTest extends Activity implements OnClickListener {    private Button alphaButton;    private Button scaleButton;    private Button rotateButton;    private Button transButton;    private ImageView animImageView;    @Override    protected void onCreate(Bundle savedInstanceState) {    // TODO Auto-generated method stub    super.onCreate(savedInstanceState);    setContentView(R.layout.tween_animation_layout);    initView();    }    private void initView() {    animImageView = (ImageView) findViewById(R.id.anim_image);    alphaButton = (Button) findViewById(R.id.alpha_button);    scaleButton = (Button) findViewById(R.id.scale_button);    rotateButton = (Button) findViewById(R.id.rotate_button);    transButton = (Button) findViewById(R.id.trans_button);    alphaButton.setOnClickListener(this);    scaleButton.setOnClickListener(this);    rotateButton.setOnClickListener(this);    transButton.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {    case R.id.alpha_button:        break;    case R.id.scale_button:        Animation animation = AnimationUtils.loadAnimation(this, R.anim.anim_scale);        animImageView.startAnimation(animation);        break;    case R.id.rotate_button:        break;    case R.id.trans_button:        break;        }    }}

    alpha animation? Adjust transparency

    The parameters of alpha are as follows:

  • android:fromAlpha: transparency at the beginning of animation, from 0.0~ 1.0, 0.0 means completely transparent, 1.0 means completely opaque.
  • android:toAlpha: The transparency at the end of the animation is also from 0.0~1.0.
  • Properties inherited from the Animation class:

  • android:duration: animation duration, in milliseconds.
  • android:fillAfter: If set to true, when the control animation ends, the last state of the animation will be maintained.
  • android:fillBefore: If set to true, after the control animation ends, it will be restored to the state before the startup animation.
  • android:fillEnabled: has the same effect as android:fillBefore, both restore the control to its initial state at the end of the animation.
  • android:repeatCount: Number of repetitions
  • android:repeatMode: Repeat type, with two values: reverse and restart. Reverse means playback in reverse order, and restart means playback again.
  • We use the previous TweenAnimationTest class as a template. When the alpha button is clicked, we trigger the transparency animation effect.

    res/anim/anim_alpha.xml file is as follows:

    <?xml version="1.0" encoding="utf-8"?><alpha xmlns:android="http://schemas.android.com/apk/res/android" android:duration="500" android:fillBefore="true" android:fromAlpha="0.0" android:toAlpha="1.0" ></alpha>

    The listener event in response to clicking the alpha button is:

    case R.id.alpha_button:    Animation alphaAnimation = AnimationUtils.loadAnimation(this, R.anim.anim_alpha);    animImageView.startAnimation(alphaAnimation);    break;

    rotate animation?rotate

    rotate parameters are as follows:

  • android:fromDegrees: the angular position of starting rotation, positive value represents the angle of clockwise rotation, and negative value represents the angle of counterclockwise rotation.
  • android:toDegrees: The angular position to which the rotation is completed. Positive values ​​represent clockwise angles, and negative values ​​represent counterclockwise rotation angles.
  • android:pivotX: X-axis coordinate of the starting point of rotation.
  • android:pivotY: Y-axis coordinate of the starting point of rotation.
  • Properties inherited from the Animation class:

  • android:duration:动画持续时间,以毫秒为单位。
  • android:fillAfter:如果设置为true,控件动画结束时,将保持动画最后时的状态。
  • android:fillBefore:如果设置为true,控件动画结束后,还原到开机动画前的状态。
  • android:fillEnabled:与android:fillBefore的效果相同,都是在动画结束时将控件还原到初始状态。
  • android:repeatCount:重复次数
  • android:repeatMode:重复类型,有reverse和restart两个值,reverse表示倒序回放,restart表示重新放一遍。
  • res/anim/anim_rotate.xml文件如下:

    <?xml version="1.0" encoding="utf-8"?><rotate xmlns:android="http://schemas.android.com/apk/res/android" android:duration="1000" android:fillAfter="true" android:fromDegrees="0" android:pivotX="0" android:pivotY="0" android:repeatCount="3" android:toDegrees="810" ></rotate>

    响应点击alpha button的listener事件为:

    case R.id.rotate_button:    Animation rotateAnimation = AnimationUtils.loadAnimation(this, R.anim.anim_rotate);    animImageView.startAnimation(rotateAnimation);    break;

    translate动画?平移

    translate参数:

  • android:fromXDelta:起始X轴坐标。
  • android:fromYDelta:起始Y轴坐标。
  • android:toXDelta:结束X轴坐标。
  • android:toYDelta:结束Y轴坐标。
  • 从Animation类继承的属性:

  • android:duration:动画持续时间,以毫秒为单位。
  • android:fillAfter:如果设置为true,控件动画结束时,将保持动画最后时的状态。
  • android:fillBefore:如果设置为true,控件动画结束后,还原到开机动画前的状态。
  • android:fillEnabled:与android:fillBefore的效果相同,都是在动画结束时将控件还原到初始状态。
  • android:repeatCount:重复次数
  • android:repeatMode:重复类型,有reverse和restart两个值,reverse表示倒序回放,restart表示重新放一遍。
  • 注意:京东splash页面的进度条用的就是translate动画。

    res/anim/anim_rotate.xml文件如下:

    <?xml version="1.0" encoding="utf-8"?><translate xmlns:android="http://schemas.android.com/apk/res/android" android:duration="2000" android:fillAfter="true" android:fromXDelta="0.0" android:toXDelta="60%p" ></translate>

    响应点击alpha button的listener事件为:

    case R.id.trans_button:    Animation transAnimation = AnimationUtils.loadAnimation(this, R.anim.anim_translate);    animImageView.startAnimation(transAnimation);    break;
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