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app/src/main/java/com/gh/common/view/EmptyDrawable.java

@@ -0,0 +1,52 @@
+package com.gh.common.view;
+
+import android.annotation.SuppressLint;
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.drawable.Drawable;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+
+/**
+ * 一个空的类 主要是用来回调 onLevelChange(加载进度)的内容
+ */
+
+public class EmptyDrawable extends Drawable {
+    private OnLoadingListener mLoadingListener;
+
+    public EmptyDrawable(OnLoadingListener listener) {
+        this.mLoadingListener = listener;
+    }
+
+    @Override
+    public void draw(@NonNull Canvas canvas) {
+
+    }
+
+    @Override
+    public void setAlpha(int alpha) {
+
+    }
+
+    @Override
+    public void setColorFilter(@Nullable ColorFilter colorFilter) {
+
+    }
+
+    @SuppressLint("WrongConstant")
+    @Override
+    public int getOpacity() {
+        return 0;
+    }
+
+    //Default Max:10000
+    @Override
+    protected boolean onLevelChange(int level) {
+        if (mLoadingListener != null) mLoadingListener.onProgress(level);
+        return false;
+    }
+
+    public interface OnLoadingListener {
+        void onProgress(int progress);
+    }
+}