动画的简单应用

红点代表pointx，pointy分别是0，0
rotate，scale 的属性
android:pivotX=”0%”
android:pivotY=”0%”
都在红点出发生变化

动画的基本用法：

package com.example.animation;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private Button scale;
    private Button alpha;
    private Button rotate;
    private Button translate;
    private ImageView image;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        scale = (Button) findViewById(R.id.scale);
        alpha =(Button) findViewById(R.id.alpha);
        rotate =(Button)findViewById(R.id.rotate);
        translate = (Button) findViewById(R.id.translate);
        translate.setOnClickListener(this);
        rotate.setOnClickListener(this);
        alpha.setOnClickListener(this);
        scale.setOnClickListener(this);
        image = (ImageView) findViewById(R.id.image);
    }

    @Override
    public void onClick(View v) {
        Animation loadAnimation;
        switch (v.getId()){
            case R.id.scale: {
                loadAnimation = AnimationUtils.loadAnimation(this, R.anim.scale);
                image.startAnimation(loadAnimation);
                break;
            }

            case R.id.alpha: {
                loadAnimation = AnimationUtils.loadAnimation(this, R.anim.alpha);
                image.startAnimation(loadAnimation);
                break;
            }

            case R.id.rotate: {
                loadAnimation = AnimationUtils.loadAnimation(this, R.anim.rotate);  
                image.startAnimation(loadAnimation);
                break;
            }

            case R.id.translate: {
                loadAnimation = AnimationUtils.loadAnimation(this, R.anim.translate); 
                image.startAnimation(loadAnimation);
                break;
            }
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <Button
        android:id="@+id/scale"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="ScaleAnimation(缩放动画)" />
    <Button
        android:id="@+id/alpha"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="AlphaAnimation（透明度动画）" />

    <Button
        android:id="@+id/rotate"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="RotateAnimation（旋转动画）" />

    <Button
        android:id="@+id/translate"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="TranslateAnimation（位移动画）" />

    <ImageView
        android:id="@+id/image"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_gravity="center"
        android:src="@mipmap/ic_launcher" >
    </ImageView>
</LinearLayout>

<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <translate
        android:duration="1000"
        android:fromXDelta="0"
        android:fromYDelta="0"
        android:toXDelta="100"
        android:toYDelta="100" />

</set>

<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <rotate
        android:duration="1000"
        android:fromDegrees="0"
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"
        android:pivotX="0%"
        android:pivotY="0%"
        android:toDegrees="+360" />

    </set>

<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <alpha
        android:duration="1000"
        android:fromAlpha="0.1"
        android:toAlpha="1.0" >
    </alpha>

</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <scale
        android:duration="2000"
        android:fillAfter="false"
        android:fromXScale="0.0"
        android:fromYScale="0.0"
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"
        android:pivotX="0%"
        android:pivotY="0%"
        android:toXScale="1.0"
        android:toYScale="1.0" />
    <!--pivotX,pivotY相对于x，y周的位置 50%，50% 为中心-->

</set>