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"