Android(安卓)利用ScaleDrawable实现缩放

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="match_parent"        android:layout_height="match_parent"        android:layout_centerHorizontal="true"        android:minHeight="400dp"        android:minWidth="400dp"        android:scaleType="fitXY"        android:src="@drawable/scale_drawable"/>RelativeLayout>

二，@drawable/scale_drawable 对应资源

<?xml version="1.0" encoding="utf-8"?><scale xmlns:android="http://schemas.android.com/apk/res/android"       android:drawable="@drawable/start_one"       android:scaleGravity="center"       android:scaleHeight="100%"       android:scaleWidth="100%">scale>

三，java 代码

public class Main5Activity extends AppCompatActivity {    private ImageView iv;    private Drawable scaleDrawable;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main5);        iv = (ImageView)findViewById(R.id.iv);        scaleDrawable = iv.getDrawable();        ValueAnimator valueAnimator  =  ValueAnimator.ofInt(1,10000);        valueAnimator.setDuration(5000);        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                scaleDrawable.setLevel((int)animation.getAnimatedValue());            }        });        valueAnimator.start();    }}

四，效果图

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