Android(安卓)动画之RotateAnimation应用详解

android中提供了4中动画：
AlphaAnimation 透明度动画效果
ScaleAnimation 缩放动画效果
TranslateAnimation 位移动画效果
RotateAnimation 旋转动画效果

本节讲解RotateAnimation 动画，
RotateAnimation (float fromDegrees, float toDegrees, int pivotXType, float pivotXValue, int pivotYType, float pivotYValue)
参数说明：
float fromDegrees：旋转的开始角度。
float toDegrees：旋转的结束角度。
int pivotXType：X轴的伸缩模式，可以取值为ABSOLUTE、RELATIVE_TO_SELF、RELATIVE_TO_PARENT。
float pivotXValue：X坐标的伸缩值。
int pivotYType：Y轴的伸缩模式，可以取值为ABSOLUTE、RELATIVE_TO_SELF、RELATIVE_TO_PARENT。
float pivotYValue：Y坐标的伸缩值。
代码：

复制代码代码如下:
public class MainActivity extends Activity {
ImageView image;
Button start;
Button cancel;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
image = (ImageView) findViewById(R.id.main_img);
start = (Button) findViewById(R.id.main_start);
cancel = (Button) findViewById(R.id.main_cancel);
/** 设置旋转动画 */
final RotateAnimation animation =new RotateAnimation(0f,360f,Animation.RELATIVE_TO_SELF,
0.5f,Animation.RELATIVE_TO_SELF,0.5f);
animation.setDuration(3000);//设置动画持续时间
/** 常用方法 */
//animation.setRepeatCount(int repeatCount);//设置重复次数
//animation.setFillAfter(boolean);//动画执行完后是否停留在执行完的状态
//animation.setStartOffset(long startOffset);//执行前的等待时间
start.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
image.setAnimation(animation);
/** 开始动画 */
animation.startNow();
}
});
cancel.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
/** 结束动画 */
animation.cancel();
}
});
}

}

应用：listview 上拉刷新，下拉加载箭头

package com.imooc.listviewfrashdemo1;import java.text.SimpleDateFormat;import java.util.Date;import android.content.Context;import android.util.AttributeSet;import android.util.Log;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.animation.RotateAnimation;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.ImageView;import android.widget.ListView;import android.widget.ProgressBar;import android.widget.TextView;import com.example.listviewfrashdemo1.R;public class ReFlashListView extends ListView implements OnScrollListener {View header;// 顶部布局文件；int headerHeight;// 顶部布局文件的高度；int firstVisibleItem;// 当前第一个可见的item的位置；int scrollState;// listview 当前滚动状态；boolean isRemark;// 标记，当前是在listview最顶端摁下的；int startY;// 摁下时的Y值；int state;// 当前的状态；final int NONE = 0;// 正常状态；final int PULL = 1;// 提示下拉状态；final int RELESE = 2;// 提示释放状态；final int REFLASHING = 3;// 刷新状态；IReflashListener iReflashListener;//刷新数据的接口View footer;// 底部布局；int totalItemCount;// 总数量；int lastVisibleItem;// 最后一个可见的item；boolean isLoading;// 正在加载；ILoadListener iLoadListener;public ReFlashListView(Context context) {super(context);initView(context);}public ReFlashListView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubinitView(context);}public ReFlashListView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);// TODO Auto-generated constructor stubinitView(context);}/** * 初始化界面，添加顶部布局文件到 listview *  * @param context */private void initView(Context context) {LayoutInflater inflater = LayoutInflater.from(context);header = inflater.inflate(R.layout.header_layout, null);measureView(header);headerHeight = header.getMeasuredHeight();Log.i("tag", "headerHeight = " + headerHeight);topPadding(-headerHeight);this.addHeaderView(header);footer = inflater.inflate(R.layout.footer_layout, null);footer.findViewById(R.id.load_layout).setVisibility(View.GONE);this.addFooterView(footer);this.setOnScrollListener(this);}/** * 通知父布局，占用的宽，高； *  * @param view */private void measureView(View view) {ViewGroup.LayoutParams p = view.getLayoutParams();if (p == null) {p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);}int width = ViewGroup.getChildMeasureSpec(0, 0, p.width);int height;int tempHeight = p.height;if (tempHeight > 0) {height = MeasureSpec.makeMeasureSpec(tempHeight,MeasureSpec.EXACTLY);} else {height = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);}view.measure(width, height);}/** * 设置header 布局 上边距； *  * @param topPadding */private void topPadding(int topPadding) {header.setPadding(header.getPaddingLeft(), topPadding,header.getPaddingRight(), header.getPaddingBottom());header.invalidate();}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {// TODO Auto-generated method stubthis.firstVisibleItem = firstVisibleItem;this.lastVisibleItem = firstVisibleItem + visibleItemCount;this.totalItemCount = totalItemCount;}@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {// TODO Auto-generated method stubthis.scrollState = scrollState;if (totalItemCount == lastVisibleItem&& scrollState == SCROLL_STATE_IDLE) {if (!isLoading) {isLoading = true;footer.findViewById(R.id.load_layout).setVisibility(View.VISIBLE);// 加载更多iLoadListener.onLoad();}}}@Overridepublic boolean onTouchEvent(MotionEvent ev) {// TODO Auto-generated method stubswitch (ev.getAction()) {case MotionEvent.ACTION_DOWN:if (firstVisibleItem == 0) {isRemark = true;startY = (int) ev.getY();}break;case MotionEvent.ACTION_MOVE:onMove(ev);break;case MotionEvent.ACTION_UP:if (state == RELESE) {state = REFLASHING;// 加载最新数据；reflashViewByState();iReflashListener.onReflash();} else if (state == PULL) {state = NONE;isRemark = false;reflashViewByState();}break;}return super.onTouchEvent(ev);}/** * 判断移动过程操作； *  * @param ev */private void onMove(MotionEvent ev) {if (!isRemark) {return;}int tempY = (int) ev.getY();int space = tempY - startY;int topPadding = space - headerHeight;switch (state) {case NONE:if (space > 0) {state = PULL;reflashViewByState();}break;case PULL:topPadding(topPadding);if (space > headerHeight + 30&& scrollState == SCROLL_STATE_TOUCH_SCROLL) {state = RELESE;reflashViewByState();}break;case RELESE:topPadding(topPadding);if (space < headerHeight + 30) {state = PULL;reflashViewByState();} else if (space <= 0) {state = NONE;isRemark = false;reflashViewByState();}break;}}/** * 根据当前状态，改变界面显示； */private void reflashViewByState() {TextView tip = (TextView) header.findViewById(R.id.tip);ImageView arrow = (ImageView) header.findViewById(R.id.arrow);ProgressBar progress = (ProgressBar) header.findViewById(R.id.progress);/**  William 2016年1月7日14:51:43 float fromDegrees：旋转的开始角度。  float toDegrees：旋转的结束角度。  int pivotXType：X轴的伸缩模式，可以取值为ABSOLUTE、RELATIVE_TO_SELF、RELATIVE_TO_PARENT。 float pivotXValue：X坐标的伸缩值。  int pivotYType：Y轴的伸缩模式，可以取值为ABSOLUTE、RELATIVE_TO_SELF、RELATIVE_TO_PARENT。 float pivotYValue：Y坐标的伸缩值。  */RotateAnimation anim = new RotateAnimation(0, 180,RotateAnimation.RELATIVE_TO_SELF, 0.5f,RotateAnimation.RELATIVE_TO_SELF, 0.5f);anim.setDuration(500);anim.setFillAfter(true);RotateAnimation anim1 = new RotateAnimation(180, 0,RotateAnimation.RELATIVE_TO_SELF, 0.5f,RotateAnimation.RELATIVE_TO_SELF, 0.5f);anim1.setDuration(500);anim1.setFillAfter(true);switch (state) {case NONE:arrow.clearAnimation();topPadding(-headerHeight);break;case PULL:arrow.setVisibility(View.VISIBLE);progress.setVisibility(View.GONE);tip.setText("下拉可以刷新！");arrow.clearAnimation();arrow.setAnimation(anim1);break;case RELESE:arrow.setVisibility(View.VISIBLE);progress.setVisibility(View.GONE);tip.setText("松开可以刷新！");arrow.clearAnimation();arrow.setAnimation(anim);break;case REFLASHING:topPadding(50);arrow.setVisibility(View.GONE);progress.setVisibility(View.VISIBLE);tip.setText("正在刷新...");arrow.clearAnimation();break;}}/** * 获取完数据； */public void reflashComplete() {state = NONE;isRemark = false;reflashViewByState();TextView lastupdatetime = (TextView) header.findViewById(R.id.lastupdate_time);SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日 hh:mm:ss");Date date = new Date(System.currentTimeMillis());String time = format.format(date);lastupdatetime.setText(time);}public void setReflashListener(IReflashListener iReflashListener){this.iReflashListener = iReflashListener;}public void setILoadListener(ILoadListener iLoadListener){this.iLoadListener = iLoadListener;}/** * 刷新数据接口 * @author Administrator */public interface IReflashListener{public void onReflash();}/** * 加载完毕 */public void loadComplete(){isLoading = false;footer.findViewById(R.id.load_layout).setVisibility(View.GONE);}//加载更多数据的回调接口public interface ILoadListener{public void onLoad();}}

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