Show progress bar when downloading

htmltextview-default-adapter/src/main/java/com/westkit/htmltextview/defaultadapater/HtmlTextViewDefaultAdapter.java

@@ -5,6 +5,7 @@
 import android.util.Log;
 
 import com.facebook.drawee.backends.pipeline.Fresco;
+import com.facebook.drawee.drawable.ProgressBarDrawable;
 import com.facebook.drawee.interfaces.DraweeController;
 import com.facebook.drawee.view.SimpleDraweeView;
 import com.westkit.htmltextview.HtmlTextView;
@@ -22,9 +23,11 @@ public ImgViewHolder renderImg(Context context, String src, int width, int heigh
             DraweeController controller = Fresco.newDraweeControllerBuilder()
                     .setUri(Uri.parse(src))
                     .setAutoPlayAnimations(true)
-            .build();
+                    .build();
             view.setController(controller);
 
+            view.getHierarchy().setProgressBarImage(new HtmlTextViewProgressBarDrawable());
+
             oldViewHolder = new ImgViewHolder(view);
         }
 

htmltextview-default-adapter/src/main/java/com/westkit/htmltextview/defaultadapater/HtmlTextViewProgressBarDrawable.java

@@ -0,0 +1,111 @@
+package com.westkit.htmltextview.defaultadapater;
+
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.util.Log;
+
+import com.facebook.drawee.drawable.DrawableUtils;
+import com.facebook.drawee.drawable.ProgressBarDrawable;
+
+//Adapt from Fresco's ProgressBarDrawable
+public class HtmlTextViewProgressBarDrawable extends Drawable {
+    private static final String TAG = "HtmlTextViewProgressBarDrawable";
+    private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
+    private int mBackgroundColor = 0x80CCCCCC;
+    private int mColor = 0x800099FF;
+    private int mBarWidth = 8;
+    private int mLevel = 0;
+    private boolean mHideWhenZero = false;
+
+    /** Sets the progress bar color. */
+    public void setColor(int color) {
+        if (mColor != color) {
+            mColor = color;
+            invalidateSelf();
+        }
+    }
+
+    /** Gets the progress bar color. */
+    public int getColor() {
+        return mColor;
+    }
+
+    /** Sets the progress bar background color. */
+    public void setBackgroundColor(int backgroundColor) {
+        if (mBackgroundColor != backgroundColor) {
+            mBackgroundColor = backgroundColor;
+            invalidateSelf();
+        }
+    }
+
+    /** Gets the progress bar background color. */
+    public int getBackgroundColor() {
+        return mBackgroundColor;
+    }
+
+    /** Sets the progress bar width. */
+    public void setBarWidth(int barWidth) {
+        if (mBarWidth != barWidth) {
+            mBarWidth = barWidth;
+            invalidateSelf();
+        }
+    }
+
+    /** Gets the progress bar width. */
+    public int getBarWidth() {
+        return mBarWidth;
+    }
+
+    /** Sets whether the progress bar should be hidden when the progress is 0. */
+    public void setHideWhenZero(boolean hideWhenZero) {
+        mHideWhenZero = hideWhenZero;
+    }
+
+    /** Gets whether the progress bar should be hidden when the progress is 0. */
+    public boolean getHideWhenZero() {
+        return mHideWhenZero;
+    }
+
+    @Override
+    protected boolean onLevelChange(int level) {
+        mLevel = level;
+        invalidateSelf();
+        return true;
+    }
+
+    @Override
+    public void setAlpha(int alpha) {
+        mPaint.setAlpha(alpha);
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter cf) {
+        mPaint.setColorFilter(cf);
+    }
+
+    @Override
+    public int getOpacity() {
+        return DrawableUtils.getOpacityFromColor(mPaint.getColor());
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        if (mHideWhenZero && mLevel == 0) {
+            return;
+        }
+        drawBar(canvas, 10000, mBackgroundColor);
+        drawBar(canvas, mLevel, mColor);
+    }
+
+    private void drawBar(Canvas canvas, int level, int color) {
+        Rect bounds = getBounds();
+        int length = bounds.width() * level / 10000;
+        int xpos = bounds.left;
+        int ypos = bounds.top;
+        mPaint.setColor(color);
+        canvas.drawRect(xpos, ypos, xpos + length, ypos + mBarWidth, mPaint);
+    }
+}