ObjectAnimator的简单使用

ObjectAnimator的简单使用

1.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" android:background="@android:color/white" tools:context=".MainActivity">

    <TextView  android:id="@+id/main_tv" android:layout_width="200dp" android:layout_height="200dp" android:layout_centerInParent="true" />


    <Button  android:id="@+id/main_btn_top" android:layout_width="match_parent" android:layout_height="150dp" android:background="@android:color/white" />

    <Button  android:id="@+id/main_btn_bottom" android:layout_width="match_parent" android:layout_height="150dp" android:layout_alignParentBottom="true" android:background="@android:color/white" />

</RelativeLayout>

2.在res/anim/property_animator_large.xml文件中，ObjectAnimator的xml放大动画。

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:duration="1000" android:ordering="together">

    <objectAnimator  android:interpolator="@android:anim/overshoot_interpolator" android:propertyName="scaleX" android:valueFrom="0.1f" android:valueTo="1.0f" android:valueType="floatType" />

    <objectAnimator  android:interpolator="@android:anim/overshoot_interpolator" android:propertyName="scaleY" android:valueFrom="0.1f" android:valueTo="1.0f" android:valueType="floatType" />

    <objectAnimator  android:propertyName="backgroundColor" android:valueFrom="@android:color/holo_red_dark" android:valueTo="@android:color/holo_blue_bright" android:valueType="colorType" />
</set>

3.在res/anim/property_animator_small.xml文件中，ObjectAnimator的xml缩小动画。

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:duration="1000" android:ordering="together">

    <objectAnimator  android:interpolator="@android:anim/overshoot_interpolator" android:propertyName="scaleX" android:valueFrom="1.0f" android:valueTo="0.1f" android:valueType="floatType" />

    <objectAnimator  android:interpolator="@android:anim/overshoot_interpolator" android:propertyName="scaleY" android:valueFrom="1.0f" android:valueTo="0.1f" android:valueType="floatType" />

    <objectAnimator  android:propertyName="backgroundColor" android:valueFrom="@android:color/holo_blue_bright" android:valueTo="@android:color/holo_red_dark" android:valueType="colorType" />

</set>

4.在MainActivity中

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private TextView mTextView;
    private Button mButtonTop;
    private Button mButtonBottom;

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

    private void initView() {
        mTextView = (TextView) findViewById(R.id.main_tv);
        mButtonTop = (Button) findViewById(R.id.main_btn_top);
        mButtonBottom = (Button) findViewById(R.id.main_btn_bottom);
    }

    private void initListener() {
        mButtonTop.setOnClickListener(this);
        mButtonBottom.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.main_btn_top:
                //大变小
// largeToSmallAnim(mTextView);

                //xml实现
                xmlSmallAnim(mTextView);

                break;

            case R.id.main_btn_bottom:
                //小变大
// smallToLarge(mTextView);

                //xml实现
                xmlLargeAnim(mTextView);
                break;
        }
    }

    private void xmlSmallAnim(View view) {
        Animator animator = AnimatorInflater.loadAnimator(this, R.animator.property_animator_small);
        animator.setTarget(view);
        animator.start();
    }

    private void xmlLargeAnim(View view) {
        Animator animator = AnimatorInflater.loadAnimator(this, R.animator.property_animator_large);
        animator.setTarget(view);
        animator.start();
    }

    private void largeToSmallAnim(View view) {
        ObjectAnimator scaleX = ObjectAnimator.ofFloat(view, "scaleX", 1.0f, 0.1f,1.0f);
        scaleX.setInterpolator(new OvershootInterpolator());
        ObjectAnimator scaleY = ObjectAnimator.ofFloat(view, "scaleY", 1.0f, 0.1f,1.0f);
        scaleY.setInterpolator(new OvershootInterpolator());
        ObjectAnimator color = ObjectAnimator.ofArgb(view, "backgroundColor", 0xFFFF0000, 0xFF0000FF);

        AnimatorSet set = new AnimatorSet();
        set.playTogether(scaleX, scaleY, color);
        set.setDuration(1000).start();
    }

    private void smallToLarge(View view) {
        ObjectAnimator scaleX = ObjectAnimator.ofFloat(view, "scaleX", 0.1f, 1.0f,0.5f);
        scaleX.setInterpolator(new OvershootInterpolator());
        ObjectAnimator scaleY = ObjectAnimator.ofFloat(view, "scaleY", 0.1f, 1.0f,0.5f);
        scaleY.setInterpolator(new OvershootInterpolator());
        ObjectAnimator color = ObjectAnimator.ofArgb(view, "backgroundColor", 0xFF0000FF, 0xFFFF0000);

        AnimatorSet set = new AnimatorSet();
        set.playTogether(scaleX, scaleY, color);
        set.setDuration(1000).start();
    }
}

在代码中实现动画更加灵活，可以设置更多的变量，在xml只能设置2个属性值

 ObjectAnimator.ofFloat(view, "scaleX", 1.0f, 0.1f,1.0f);

 android:valueFrom="1.0f"
 android:valueTo="0.1f"