自定义 头部刷新和底部刷新

在我们使用SmartRefreshLayout的时候也就是它 有默认的上拉刷新下滑 加载更多的图标或文字 所有写了一下自定义头部刷新图标和底部刷新 。

思路：
添加刷新底部和头部依赖
创建头部和底部的view 都 继承（extends） ConstraintLayout 实现（implements） RefreshHeader
创建XML 布局
在Application里面构造全局(避免在每个页面添加Head，Foot 的Xml布局)
在我们刷新的时候有时会下拉但是不动。如何处理？
答：我使用了帧动画也就是将gif 转为png 图片，每次下拉的时候不会自己转动。具体在自定义View中体现

1. 添加刷新底部和头部依赖

implementation deps.other.smartRefreshLayout
implementation deps.other.smartRefreshHeader

2. 创建头部和底部的view 都 继承（extends） ConstraintLayout 实现（implements） RefreshHeader

a.Head:

public class SmartRefreshHeader extends ConstraintLayout implements RefreshHeader {

    private GifView mGifView;
    private ImageView mMaskView;
    private DecimalFormat decimalFormat = new DecimalFormat("000");

    public SmartRefreshHeader(Context context) {
        super(context);
    }

    public SmartRefreshHeader(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SmartRefreshHeader(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }


    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        mGifView = findViewById(R.id.gifView);
        mMaskView = findViewById(R.id.maskView);
        mGifView.setVisibility(INVISIBLE);
        mGifView.pause();
    }

    @NonNull
    @Override
    public View getView() {
        return this;
    }

    @NonNull
    @Override
    public SpinnerStyle getSpinnerStyle() {
        return SpinnerStyle.Translate;
    }

    @Override
    public void setPrimaryColors(int... colors) {
    }

    @Override
    public void onInitialized(@NonNull RefreshKernel kernel, int height, int maxDragHeight) {

    }

    @Override
    public void onMoving(boolean isDragging, float percent, int offset, int height, int maxDragHeight) {
        mGifView.setVisibility( offset > 1 ? INVISIBLE : VISIBLE);
        mMaskView.setVisibility(offset > 1 ? VISIBLE : INVISIBLE);
        if (isDragging && percent <= 1) {
            int p = (int) (percent * 100) / 2; // (0 ~ 50)
            String prefixName = "header" + decimalFormat.format(p);
            int id = getResources().getIdentifier(prefixName, "drawable", getContext().getPackageName());
            if (id > 0) {
                mMaskView.setBackgroundResource(id);
            }
        }

    }

    @Override
    public void onReleased(@NonNull RefreshLayout refreshLayout, int height, int maxDragHeight) {

    }

    @Override
    public void onStartAnimator(@NonNull RefreshLayout refreshLayout, int height, int maxDragHeight) {
        mMaskView.setVisibility(INVISIBLE);
        mGifView.setVisibility(VISIBLE);
        mGifView.play();
    }

    @Override
    public int onFinish(@NonNull RefreshLayout refreshLayout, boolean success) {
        mGifView.pause();
        return 500;
    }

    @Override
    public void onHorizontalDrag(float percentX, int offsetX, int offsetMax) {

    }

    @Override
    public boolean isSupportHorizontalDrag() {
        return false;
    }

    @Override
    public void onStateChanged(@NonNull RefreshLayout refreshLayout, @NonNull RefreshState oldState, @NonNull RefreshState newState) {

        //switch ()
    }
}

b.Foot

public class SmartRefreshFooter extends ConstraintLayout implements RefreshFooter {

    private GifView mGifView;
    private ImageView mMaskView;
    private DecimalFormat decimalFormat = new DecimalFormat("000");

    public SmartRefreshFooter(Context context) {
        super(context);
    }

    public SmartRefreshFooter(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SmartRefreshFooter(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }


    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        mGifView = findViewById(R.id.gifView);
        mMaskView = findViewById(R.id.maskView);
        mGifView.setVisibility(INVISIBLE);
        mGifView.pause();
    }

    @NonNull
    @Override
    public View getView() {
        return this;
    }

    @NonNull
    @Override
    public SpinnerStyle getSpinnerStyle() {
        return SpinnerStyle.Translate;
    }

    @Override
    public void setPrimaryColors(int... colors) {
    }

    @Override
    public void onInitialized(@NonNull RefreshKernel kernel, int height, int maxDragHeight) {

    }

    @Override
    public void onMoving(boolean isDragging, float percent, int offset, int height, int maxDragHeight) {
        if (isDragging && percent <= 1) {
            if(!mGifView.isPlaying()){
                mGifView.setVisibility(INVISIBLE);
                mMaskView.setVisibility(VISIBLE);
                int p = (int) (percent * 100) / 2; // (0 ~ 50)
                String prefixName = "header" + decimalFormat.format(p);
                int id = getResources().getIdentifier(prefixName, "drawable", getContext().getPackageName());
                if (id > 0) {
                    mMaskView.setBackgroundResource(id);
                }
            }else{
                mMaskView.setVisibility(INVISIBLE);
            }


        }

    }

    @Override
    public void onReleased(@NonNull RefreshLayout refreshLayout, int height, int maxDragHeight) {

    }

    @Override
    public void onStartAnimator(@NonNull RefreshLayout refreshLayout, int height, int maxDragHeight) {
        mMaskView.setVisibility(INVISIBLE);
        mGifView.setVisibility(VISIBLE);
        mGifView.play();
    }

    @Override
    public int onFinish(@NonNull RefreshLayout refreshLayout, boolean success) {
        mGifView.pause();
        return 500; //  加载完成后多久关闭，即回弹会去
    }

    @Override
    public void onHorizontalDrag(float percentX, int offsetX, int offsetMax) {

    }

    @Override
    public boolean isSupportHorizontalDrag() {
        return false;
    }

    @Override
    public void onStateChanged(@NonNull RefreshLayout refreshLayout, @NonNull RefreshState oldState, @NonNull RefreshState newState) {

    }

    @Override
    public boolean setNoMoreData(boolean noMoreData) {
        return false;
    }
}

创建自定义VIew 的xml

a.header:

<com.wds.see_road.widgets.SmartRefreshHeader
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/white"
   >
    <com.cunoraz.gifview.library.GifView
        android:id="@+id/gifView"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp"
        app:gif="@drawable/mvp_loading"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/maskView"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />
</com.wds.see_road.widgets.SmartRefreshHeader>

b.footer:

<com.wds.see_road.widgets.SmartRefreshFooter
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:background="@color/white"
    android:layout_height="wrap_content"
   >
    <com.cunoraz.gifview.library.GifView
        android:id="@+id/gifView"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp"
        app:gif="@drawable/mvp_loading"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/maskView"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />
</com.wds.see_road.widgets.SmartRefreshFooter>

4.使用：

public class MyApp extends Application {
    public static MyApp app;

    public static void setApp(MyApp app) {
        MyApp.app = app;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        app=this;
        SmartRefreshLayout.setDefaultRefreshHeaderCreator(new DefaultRefreshHeaderCreator() {
            @NonNull
            @Override
            public RefreshHeader createRefreshHeader(@NonNull Context context, @NonNull RefreshLayout layout) {
                return (RefreshHeader) LayoutInflater.from(context).inflate(R.layout.layout_refresh_head,null,false);
            }

        });

        SmartRefreshLayout.setDefaultRefreshFooterCreator(new DefaultRefreshFooterCreator() {
            @NonNull
            @Override
            public RefreshFooter createRefreshFooter(@NonNull Context context, @NonNull RefreshLayout layout) {
                return (RefreshFooter) LayoutInflater.from(context).inflate(R.layout.layout_refresh_footer,null,false);
            }
        });
    }
}

必须在清单文件声明：android:name=".data.net.service.MyApp"