Improve GalleryDetailScene

app/src/main/java/com/hippo/widget/LinkifyTextView.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.widget;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+import android.text.Layout;
+import android.text.Spanned;
+import android.text.style.ClickableSpan;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.widget.TextView;
+
+public class LinkifyTextView extends TextView {
+
+    private ClickableSpan mCurrentSpan;
+
+    public LinkifyTextView(Context context) {
+        super(context);
+    }
+
+    public LinkifyTextView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public LinkifyTextView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public ClickableSpan getCurrentSpan() {
+        return mCurrentSpan;
+    }
+
+    public void clearCurrentSpan() {
+        mCurrentSpan = null;
+    }
+
+    @Override
+    public boolean onTouchEvent(@NonNull MotionEvent event) {
+        // Let the parent or grandparent of TextView to handles click aciton.
+        // Otherwise click effect like ripple will not work, and if touch area
+        // do not contain a url, the TextView will still get MotionEvent.
+        // onTouchEven must be called with MotionEvent.ACTION_DOWN for each touch
+        // action on it, so we analyze touched url here.
+        if (event.getAction() == MotionEvent.ACTION_DOWN) {
+            mCurrentSpan = null;
+
+            if (getText() instanceof Spanned) {
+                // Get this code from android.text.method.LinkMovementMethod.
+                // Work fine !
+                int x = (int) event.getX();
+                int y = (int) event.getY();
+
+                x -= getTotalPaddingLeft();
+                y -= getTotalPaddingTop();
+
+                x += getScrollX();
+                y += getScrollY();
+
+                Layout layout = getLayout();
+                int line = layout.getLineForVertical(y);
+                int off = layout.getOffsetForHorizontal(line, x);
+
+                ClickableSpan[] spans = ((Spanned)getText()).getSpans(off, off, ClickableSpan.class);
+
+                if (spans.length > 0) {
+                    mCurrentSpan = spans[0];
+                }
+            }
+        }
+
+        return super.onTouchEvent(event);
+    }
+}