PropertyValuesHolder的使用

PropertyValuesHolder的使用

PropertyValuesHolder这个类可以先将动画属性和值暂时的存储起来，后一起执行，在有些时候可以使用替换掉AnimatorSet，减少代码量

在activity_main.xml文件中

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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" tools:context=".MainActivity">

    <Button  android:id="@+id/btn" android:layout_centerInParent="true" android:layout_width="200dp" android:layout_height="200dp" android:text="执行" />
</RelativeLayout>

在MainActivity文件中

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button mButton;

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

        mButton = (Button) findViewById(R.id.btn);
        mButton.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        showPropertyValuesHolderAnim();
    }

    /**PropertyValuesHolder这个类可以先将动画属性和值暂时的存储起来，后一起执行，在有些时候可以使用替换掉AnimatorSet，减少代码量*/
    private void showPropertyValuesHolderAnim() {

        //keyframe
        Keyframe keyframe1 = Keyframe.ofFloat(0.0f,0);
        Keyframe keyframe2 = Keyframe.ofFloat(0.25f,-30);
        Keyframe keyframe3 = Keyframe.ofFloat(0.5f,0);
        Keyframe keyframe4 = Keyframe.ofFloat(0.75f, 30);
        Keyframe keyframe5 = Keyframe.ofFloat(1.0f,0);
        PropertyValuesHolder rotation = PropertyValuesHolder.ofKeyframe("rotation", keyframe1, keyframe2, keyframe3, keyframe4,keyframe5);

        PropertyValuesHolder alpha = PropertyValuesHolder.ofFloat("alpha",1.0f,0.2f,1.0f);
        PropertyValuesHolder scaleX = PropertyValuesHolder.ofFloat("scaleX",1.0f,0.2f,1.0f);
        PropertyValuesHolder scaleY = PropertyValuesHolder.ofFloat("scaleY",1.0f,0.2f,1.0f);
        PropertyValuesHolder color = PropertyValuesHolder.ofInt("BackgroundColor", 0XFFFFFF00, 0XFF0000FF);

        ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(mButton, alpha, scaleX, scaleY,color,rotation);
        animator.setInterpolator(new OvershootInterpolator());
        animator.setDuration(5000).start();
    }
}