android

需求：

启动页：使用属性动画实现，3秒后自动跳转
（渐变、缩放、平移、旋转）

• activity_animation

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <ImageView        android:id="@+id/img"        android:layout_width="100dp"        android:layout_height="100dp"        android:layout_centerHorizontal="true"        android:src="@mipmap/ic_launcher_round" /></RelativeLayout>

-AnimationActivity

public class AnimationActivity extends AppCompatActivity {    private ImageView imageView;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_animation);        imageView = (ImageView) findViewById(R.id.img);//        平移        ObjectAnimator translationY = ObjectAnimator.ofFloat(imageView, "translationY", 0, 500f);        ObjectAnimator alpha = ObjectAnimator.ofFloat(imageView, "alpha", 0f, 1f);        ObjectAnimator rotation = ObjectAnimator.ofFloat(imageView, "rotation", 0f, 360f);        ObjectAnimator scaleY = ObjectAnimator.ofFloat(imageView, "scaleY", 2f, 1f);        ObjectAnimator scaleX = ObjectAnimator.ofFloat(imageView, "scaleX", 2f, 1f);        AnimatorSet animSet = new AnimatorSet();        animSet.playTogether(translationY, alpha, rotation, scaleY, scaleX);        animSet.setDuration(3000);        animSet.start();        new Handler().postDelayed(new Runnable() {            @Override            public void run() {                startActivity(new Intent(AnimationActivity.this, DetailsActivity.class));                finish();            }        }, 3000);    }