Android(安卓)利用TransitionDrawable 实现两张图片渐变切换

一，布局

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"                android:id="@+id/activity_main"                android:layout_width="match_parent"                android:layout_height="match_parent">    <ImageView        android:id="@+id/iv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:minHeight="400dp"        android:minWidth="400dp"        android:src="@drawable/transition_drawable"/>RelativeLayout>

二，@drawable/transition_drawable 对应资源

<?xml version="1.0" encoding="utf-8"?><transition  xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@drawable/start_three" />    <item android:drawable="@drawable/start_four" />transition >

三，java代码

public class Main4Activity extends AppCompatActivity {    private ImageView iv;    private TransitionDrawable transitionDrawable;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main4);        iv = (ImageView)findViewById(R.id.iv);        transitionDrawable = (TransitionDrawable)iv.getDrawable();        transitionDrawable.startTransition(4000);    }}

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