Android APP启动界面（动画）

首先定义基类BaseActivity

public abstract class BaseActivity extends AppCompatActivity {

实现类SplashActivity

public class SplashActivity extends BaseActivity {    @BindView(R.id.iv_logo)    ImageView mIvLogo;    @BindView(R.id.tv_name)    TextView mTvName;    @Override    public int getLayoutId() {        return R.layout.activty_splash;    }    @Override    public void initPresenter() {    }    @Override    public void initView() {        ............        });        animatorSet.start();    }}

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知识点：

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1. Android 注解式绑定控件BindView

    @BindView(R.id.iv_logo)    ImageView mIvLogo;    @BindView(R.id.tv_name)    TextView mTvName;

2.属性动画 PropertyValuesHolder类（存储动画属性和值，执行，降低代码量）

PropertyValuesHolder alpha = PropertyValuesHolder.ofFloat("alpha", 0.3f, 1f);        PropertyValuesHolder scaleX = PropertyValuesHolder.ofFloat("scaleX", 0.3f, 1f);        PropertyValuesHolder scaleY = PropertyValuesHolder.ofFloat("scaleY", 0.3f, 1f);        ObjectAnimator objectAnimator1 = ObjectAnimator.ofPropertyValuesHolder(mTvName, alpha, scaleX, scaleY);        ObjectAnimator objectAnimator2 = ObjectAnimator.ofPropertyValuesHolder(mIvLogo, alpha, scaleX, scaleY);

3.AnimatorSet类

AnimatorSet animatorSet = new AnimatorSet();        animatorSet.playTogether(objectAnimator1, objectAnimator2);        animatorSet.setInterpolator(new AccelerateInterpolator());        animatorSet.setDuration(2000);        animatorSet.addListener(new Animator.AnimatorListener() {            @Override            public void onAnimationStart(Animator animator) {            }            @Override            public void onAnimationEnd(Animator animator) {            MainActivity.startAction(SplashActivity .this);                finish();            }