补间动画的实现

public class MainActivity extends Activity {    private ImageView img_view;    private AlphaAnimation animation;    private AlphaAnimation alpha;    private ScaleAnimation scaleAnimation;    private TranslateAnimation transalte;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        img_view = (ImageView) findViewById(R.id.img_view);        // codeAlpha();        // initAlpha();        // 监听        img_view.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                // scaleAnimtion();                // codeScaleAnim();                // transalteAnim();                // codeTransaleAnim();                // rotateAnim();                // codeRotateAnim();                // groupAnim();                codeGroupAnim();            }        });    }    // 1.利用xml实现渐变的补间动画    private void initAlpha() {        alpha = (AlphaAnimation) AnimationUtils.loadAnimation                (MainActivity.this, R.anim.lapha_two);        img_view.startAnimation(alpha);        /*           * <alpha        android:fromAlpha="0.0"        android:toAlpha="1.0"        android:duration="5000"        xmlns:android="http://schemas.android.com/apk/res/android">         </alpha>*/    }    // 1.用代码实现渐变的补间动画    private void codeAlpha() {        animation = new AlphaAnimation(0.0f, 1.0f);        // 持续的时间        animation.setDuration(5000);        //        img_view.startAnimation(animation);    }    // 2.用xml实现缩放    private void scaleAnimtion() {        scaleAnimation = (ScaleAnimation) AnimationUtils.loadAnimation(                MainActivity.this, R.anim.scale_anim);        img_view.startAnimation(scaleAnimation);        /* XML实现缩放         * <scale        android:fromXScale="0.0"        android:toXScale="1.0"        android:fromYScale="0.0"        android:toYScale="1.0"        android:pivotX="0.5"        android:pivotY="0.5"        android:duration="1000"        xmlns:android="http://schemas.android.com/apk/res/android">        </scale>*/    }    // 2.用代码实现的缩放    private void codeScaleAnim() {        ScaleAnimation scale = new ScaleAnimation(0.0f, 1.0f, 0.0f, 1.0f,                Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,                0.5f);        scale.setDuration(1000);        img_view.startAnimation(scale);    }    // 3.用xml实现平移    private void transalteAnim() {        transalte = (TranslateAnimation) AnimationUtils.loadAnimation(                MainActivity.this, R.anim.translate_anim);        img_view.startAnimation(transalte);        /* XML实现的平移         * <translate            xmlns:android="http://schemas.android.com/apk/res/android"        android:fromXDelta="0.0"        android:toXDelta="0.0"        android:fromYDelta="0.0"        android:toYDelta="50%"        android:duration="1000"        android:repeatCount="-1"        android:repeatMode="reverse"        >               </translate>*/    }    // 3.用代码实现平移    private void codeTransaleAnim() {        float toYValue;        TranslateAnimation transalte2 = new TranslateAnimation(                Animation.RELATIVE_TO_SELF, 0f, Animation.RELATIVE_TO_SELF,                0.5f, Animation.RELATIVE_TO_SELF, 0f,                Animation.RELATIVE_TO_SELF, 0f);        // 无限循环        transalte2.setRepeatCount(-1);        // REVERSE往返循环        transalte2.setRepeatMode(Animation.REVERSE);        transalte2.setDuration(1000);        img_view.startAnimation(transalte2);    }    // 4.用xml实现旋转    private void rotateAnim() {        RotateAnimation rotate = (RotateAnimation) AnimationUtils                .loadAnimation(MainActivity.this, R.anim.rotate_anim);        img_view.startAnimation(rotate);        /*  Xml定义         * <rotate             xmlns:android="http://schemas.android.com/apk/res/android"         android:fromDegrees="0.0"         android:toDegrees="90"         android:pivotX="50%"         android:pivotY="50%"         android:duration="2000"        >            </rotate>*/    }    // 4.用代码实现旋转    private void codeRotateAnim() {        RotateAnimation rotate2 = new RotateAnimation(0f, 360f,                Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,                0.5f);        rotate2.setDuration(2000);        img_view.startAnimation(rotate2);    }    // 5.用xml实现的组合状态    private void groupAnim() {        AnimationSet group = (AnimationSet) AnimationUtils.loadAnimation(                MainActivity.this, R.anim.group_anim);        img_view.startAnimation(group);        /*         * anima包下的 <set         <set xmlns:android="http://schemas.android.com/apk/res/android">    <scale        android:fromXScale="0.0"        android:toXScale="1.5"        android:fromYScale="0.0"        android:toYScale="1.5"        android:duration="2000"        />    <rotate        android:fromDegrees="0.0"        android:toDegrees="360"        android:pivotX="50%"        android:pivotY="50%"        android:duration="3000"        />     </set>         */    }    // 5.用代码实现的组合状态    private void codeGroupAnim() {        AnimationSet animationSet = new AnimationSet(false);        // 旋转        RotateAnimation rotates = new RotateAnimation(0f, 360f,                Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,                0.5f);        rotates.setDuration(2000);        // 缩放        ScaleAnimation scales = new ScaleAnimation(0f, 1.5f, 0f, 1.5f,                Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,                0.5f);        scales.setDuration(3000);        // 将动画添加到动画集合中        animationSet.addAnimation(rotates);        animationSet.addAnimation(scales);        // 开启        img_view.startAnimation(animationSet);    }}