属性动画简单的使用

MainActivity代码

package likuo.bwie.com.donghua;

import android.animation.Animator;
import android.animation.AnimatorInflater;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private ImageButton imageView;
    private Button alpha_bt;
    private Button rotationY_bt;
    private Button scaleX_bt;
    private Button translationX_bt;
    private Button AnimatorSet_bt;


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

        //静态的初始就有一个动画需要在res文件加入animator加入一个xml   我的objectanimator.xml
        Animator Xmlanimator = AnimatorInflater.loadAnimator(this, R.animator.objectanimator);
        Xmlanimator.setTarget(imageView);
        Xmlanimator.start();

    }

    private void init() {
        imageView = findViewById(R.id.animation_iv);
        alpha_bt = findViewById(R.id.alpha_bt);
        rotationY_bt = findViewById(R.id.rotationY_bt);
        scaleX_bt = findViewById(R.id.scaleX_bt);
        translationX_bt = findViewById(R.id.translationY_bt);
        AnimatorSet_bt = findViewById(R.id.AnimatorSet_bt);
        alpha_bt.setOnClickListener(this);
        rotationY_bt.setOnClickListener(this);
        scaleX_bt.setOnClickListener(this);
        translationX_bt.setOnClickListener(this);
        AnimatorSet_bt.setOnClickListener(this);

    }


    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.alpha_bt:

                ObjectAnimator alpha = ObjectAnimator.ofFloat(imageView, "alpha", new float[]{0.0f, 0.2f, 0.4f, 0.6f, 0.8f, 1.0f});
                alpha.setDuration(2000);
                alpha.setRepeatMode(ObjectAnimator.RESTART);
                alpha.setRepeatCount(1);
                alpha.start();

                break;
            case R.id.rotationY_bt:
                ObjectAnimator rotationY = ObjectAnimator.ofFloat(imageView, "rotationY", new float[]{90f, 180f, 270f, 360f});
                rotationY.setDuration(2000);
                rotationY.setRepeatMode(ObjectAnimator.RESTART);
                rotationY.setRepeatCount(1);
                rotationY.start();
                break;
            case R.id.scaleX_bt:
                ObjectAnimator scaleX = ObjectAnimator.ofFloat(imageView, "scaleX", new float[]{1f, 2f, 3f, 4f, 5f, 6f, 1f});
                scaleX.setDuration(2000);
                scaleX.setRepeatMode(ObjectAnimator.RESTART);
                scaleX.setRepeatCount(1);
                scaleX.start();

                break;
            case R.id.translationY_bt:
                ObjectAnimator translationY = ObjectAnimator.ofFloat(imageView, "translationY", new float[]{10f, 20f, 30f, 40f, 60f, 80f});
                translationY.setDuration(2000);
                translationY.setRepeatMode(ObjectAnimator.RESTART);
                translationY.setRepeatCount(1);
                translationY.start();
            case R.id.AnimatorSet_bt:
                AnimatorSet set = new AnimatorSet();
                ObjectAnimator oa = ObjectAnimator.ofFloat(imageView, "translationX", new float[]{10f, 20f, 30f, 40f, 60f, 80f});
                oa.setDuration(3000);
                ObjectAnimator oa2 = ObjectAnimator.ofFloat(imageView, "translationY", new float[]{-10f, -20f, -30f, -40f, -60f, -80f});
                oa2.setDuration(3000);
                set.playTogether(oa, oa2);
                set.start();
                break;
            default:
                break;
        }
    }

    public void yyyy(View v) {
        System.out.println("思达高科，斯大林说看风景");
    }
}

布局文件。。

<?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">
    <!--    注意background的属性置为null -->

    <Button
        android:id="@+id/alpha_bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="渐变"/>

    <Button
        android:id="@+id/translationY_bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="平移"/>

    <Button
        android:id="@+id/scaleX_bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="拉伸"/>

    <Button
        android:id="@+id/rotationY_bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="旋转"/>

    <Button
        android:id="@+id/AnimatorSet_bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="集合"/>

    <ImageButton
        android:id="@+id/animation_iv"
        android:layout_width="256dp"
        android:layout_height="264dp"
        android:layout_gravity="center"
        android:background="@null"
        android:onClick="yyyy"
        android:src="@mipmap/ic_launcher" />

</LinearLayout>

下面是那个xml文件objectanimator.xml

<?xml version="1.0" encoding="utf-8"?>
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
    android:propertyName="rotationX"
    android:duration="3000"
    android:repeatCount="1"
    android:repeatMode="reverse"
    android:startOffset="0"
    android:valueFrom="360.0">
</objectAnimator>

<!--注意:在xml定义动画类的属性,浮点型小数,直接写小数即可,不用再带f.
提示:控件位移的参照单位在xml文件里有所不同,不过更简单,不用再特意去定义参照物属性了,直接是根据值,区分两种方式:
    一种是以整个屏幕为参照物,在xml文件属性定义值是int%p;   一种以控件自身大小为参照物,在xml文件属性定义值是int-->