Android开发 之 Activity全透明渐变切换

Activity全透明渐变切换

类似于Dialog的显示动画效果一样

1. 先设置Acitivity为去透明，在取消掉Activity默认的切换动画

    <style name="AppTheme2" parent="Theme.AppCompat.Light">        <!-- Customize your theme here. -->        <item name="windowNoTitle">true</item>        <item name="colorPrimary">@color/colorPrimary</item>        <item name="colorPrimaryDark">@color/tabbackground</item>        <item name="colorAccent">@color/colorAccent</item>    　　<item name="android:windowBackground">@color/transparent</item>//这个之时全透明        <item name="android:windowIsTranslucent">true</item>        <item name="android:windowAnimationStyle">@style/activityanimation</item>    </style>    <style name="activityanimation" >        <item name="android:activityOpenEnterAnimation">@null</item>        <item name="android:activityOpenExitAnimation">@null</item>        <item name="android:activityCloseEnterAnimation">@null</item>        <item name="android:activityCloseExitAnimation">@null</item>    </style>

2. 设置渐变动画：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/ll"    android:orientation="vertical"    android:layout_width="match_parent"    android:background="#000"    android:layout_height="match_parent">    <MyImageView        android:layout_width="match_parent"        android:layout_height="300dp"        android:layout_centerInParent="true"        android:clickable="true"        android:background="@mipmap/meinv"/></RelativeLayout>

public class Activitytwo extends AppCompatActivity{    private int tran=0x00000000;    private int end=0x88000000;    private RelativeLayout ll;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);        setContentView(R.layout.ativity);        ll = (RelativeLayout) findViewById(R.id.ll);        returnposition();        ll.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                finish();            }        });    }    public void returnposition()    {        ValueAnimator colorAnim = ObjectAnimator.ofInt(ll, "backgroundColor", tran, end);        colorAnim.setDuration(300);        colorAnim.setEvaluator(new ArgbEvaluator());        colorAnim.start();    }    @Override    public void finish() {        ValueAnimator colorAnim = ObjectAnimator.ofInt(ll, "backgroundColor", end, tran);        colorAnim.setDuration(300);        colorAnim.setEvaluator(new ArgbEvaluator());        colorAnim.start();        super.finish();    }}