xml写动画

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public class Main21 extends Activity implements OnClickListener{private Button main20_rotate;private Button main20_scale;private Button main20_alpha;private Button main20_translate;private ImageView main20_image;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main20);  main20_rotate=(Button)this.findViewById(R.id.main20_rotate);  //旋转          main20_rotate.setOnClickListener(this);          main20_scale=(Button)this.findViewById(R.id.main20_scale);  //缩放          main20_scale.setOnClickListener(this);          main20_alpha=(Button)this.findViewById(R.id.main20_alpha);  //淡入淡出          main20_alpha.setOnClickListener(this);          main20_translate=(Button)this.findViewById(R.id.main20_translate);  //移动          main20_translate.setOnClickListener(this);                    main20_image=(ImageView)this.findViewById(R.id.main20_image);  }@Override      public void onClick(View v) {                  switch (v.getId()) {          case R.id.main20_rotate:     //旋转                            Animation rotate=AnimationUtils.loadAnimation(getApplicationContext(), R.anim.main21_rotate);                 main20_image.startAnimation(rotate);              break;                        case R.id.main20_scale:     //缩放                           Animation scale=AnimationUtils.loadAnimation(getApplicationContext(), R.anim.main21_scale);             main20_image.startAnimation(scale);              break;                        case R.id.main20_alpha:   //淡入淡出           Animation alpha=AnimationUtils.loadAnimation(getApplicationContext(), R.anim.main21_alpha);             main20_image.startAnimation(alpha);              break;          case R.id.main20_translate:   // 移动          Animation translate=AnimationUtils.loadAnimation(getApplicationContext(), R.anim.main21_translate);            main20_image.startAnimation(translate);                break;          default:              break;          }                }  }

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:interpolator="@android:anim/accelerate_decelerate_interpolator">        <rotate        android:fromDegrees="0"        android:toDegrees="+360"        android:pivotX="50%"        android:pivotY="50%"        android:duration="2000"></rotate></set>

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