Android实现下拉刷新的视图和图标的旋转

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/pull_to_refresh_header"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:background="#F3F3F3"> <RelativeLayout  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:paddingTop="23dp">  <LinearLayout 　　　　　　　android:id="@+id/pull_to_refresh_view"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:orientation="vertical"   android:layout_centerHorizontal="true">   <TextViewandroid:id="@+id/pull_to_refresh_text"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_gravity="center"android:text="@string/pull_to_refresh_text"    android:textColor="#777777"    android:textSize="16sp"/>   <TextViewandroid:id="@+id/pull_to_refresh_update_text"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_gravity="center"android:text="@string/pull_to_refresh_update_text"    android:textColor="#999999"    android:textSize="14sp"/>  </LinearLayout>  <ProgressBarandroid:id="@+id/pull_to_refresh_progress"   android:layout_width="30dp"   android:layout_height="30dp"android:layout_toLeftOf="@id/pull_to_refresh_view"   android:layout_marginRight="22dp"   android:layout_marginTop="5dp"   android:indeterminate="true"android:indeterminateDrawable="@drawable/ic_loading_refresh"   android:visibility="gone"/>  <ImageView   android:id="@+id/pull_to_refresh_image"   android:layout_width="32dp"   android:layout_height="32dp"android:layout_toLeftOf="@id/pull_to_refresh_view"   android:layout_marginRight="20dp"   android:layout_marginTop="5dp"   android:src="@drawable/ic_refresh_down"   android:scaleType="centerInside"android:contentDescription="@string/app_name"/> </RelativeLayout> <View  android:layout_width="match_parent"  android:layout_height="15dp"/></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><rotate xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/ic_loading" android:fromDegrees="0" android:toDegrees="360" android:pivotX="50%" android:pivotY="50%" />

private ImageView mPull_to_refresh_image;private RotateAnimation mFlipAnimation;...  mFlipAnimation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f,    RotateAnimation.RELATIVE_TO_SELF, 0.5f);  mFlipAnimation.setInterpolator(new LinearInterpolator());  mFlipAnimation.setDuration(250);  mFlipAnimation.setFillAfter(true);...mPull_to_refresh_image.startAnimation(mFlipAnimation);

public RotateAnimation(float fromDegrees, float toDegrees, int pivotXType, float pivotXValue,   int pivotYType, float pivotYValue)