Support copying links on long click.

Fixes #6343
Closes #6454

src/org/thoughtcrime/securesms/util/LongClickCopySpan.java

@@ -0,0 +1,73 @@
+package org.thoughtcrime.securesms.util;
+
+import android.annotation.TargetApi;
+import android.content.ClipData;
+import android.content.Context;
+import android.support.annotation.ColorInt;
+import android.text.TextPaint;
+import android.text.style.URLSpan;
+import android.view.View;
+import android.widget.Toast;
+
+import org.thoughtcrime.securesms.R;
+
+public class LongClickCopySpan extends URLSpan {
+  private static final String PREFIX_MAILTO = "mailto:";
+  private static final String PREFIX_TEL = "tel:";
+
+  private boolean isHighlighted;
+  @ColorInt
+  private int highlightColor;
+
+  public LongClickCopySpan(String url) {
+    super(url);
+  }
+
+  void onLongClick(View widget) {
+    Context context = widget.getContext();
+    String preparedUrl = prepareUrl(getURL());
+    copyUrl(context, preparedUrl);
+    Toast.makeText(context,
+            context.getString(R.string.ConversationItem_copied_text, preparedUrl), Toast.LENGTH_SHORT).show();
+  }
+
+  @Override
+  public void updateDrawState(TextPaint ds) {
+    super.updateDrawState(ds);
+    ds.bgColor = highlightColor;
+    ds.setUnderlineText(!isHighlighted);
+  }
+
+  void setHighlighted(boolean highlighted, @ColorInt int highlightColor) {
+    this.isHighlighted = highlighted;
+    this.highlightColor = highlightColor;
+  }
+
+  private void copyUrl(Context context, String url) {
+    int sdk = android.os.Build.VERSION.SDK_INT;
+    if (sdk < android.os.Build.VERSION_CODES.HONEYCOMB) {
+      @SuppressWarnings("deprecation") android.text.ClipboardManager clipboard =
+              (android.text.ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
+      clipboard.setText(url);
+    } else {
+      copyUriSdk11(context, url);
+    }
+  }
+
+  @TargetApi(android.os.Build.VERSION_CODES.HONEYCOMB)
+  private void copyUriSdk11(Context context, String url) {
+    android.content.ClipboardManager clipboard =
+            (android.content.ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
+    ClipData clip = ClipData.newPlainText(context.getString(R.string.app_name), url);
+    clipboard.setPrimaryClip(clip);
+  }
+
+  private String prepareUrl(String url) {
+    if (url.startsWith(PREFIX_MAILTO)) {
+      return url.substring(PREFIX_MAILTO.length());
+    } else if (url.startsWith(PREFIX_TEL)) {
+      return url.substring(PREFIX_TEL.length());
+    }
+    return url;
+  }
+}

src/org/thoughtcrime/securesms/util/LongClickMovementMethod.java

@@ -0,0 +1,103 @@
+package org.thoughtcrime.securesms.util;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.graphics.Color;
+import android.support.v4.content.ContextCompat;
+import android.text.Layout;
+import android.text.Selection;
+import android.text.Spannable;
+import android.text.method.LinkMovementMethod;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.TextView;
+
+import org.thoughtcrime.securesms.R;
+
+public class LongClickMovementMethod extends LinkMovementMethod {
+  @SuppressLint("StaticFieldLeak")
+  private static LongClickMovementMethod sInstance;
+
+  private final GestureDetector gestureDetector;
+  private View widget;
+  private LongClickCopySpan currentSpan;
+
+  private LongClickMovementMethod(final Context context) {
+    gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
+      @Override
+      public void onLongPress(MotionEvent e) {
+        if (currentSpan != null && widget != null) {
+          currentSpan.onLongClick(widget);
+          widget = null;
+          currentSpan = null;
+        }
+      }
+
+      @Override
+      public boolean onSingleTapUp(MotionEvent e) {
+        if (currentSpan != null && widget != null) {
+          currentSpan.onClick(widget);
+          widget = null;
+          currentSpan = null;
+        }
+        return true;
+      }
+    });
+  }
+
+  @Override
+  public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) {
+    int action = event.getAction();
+
+    if (action == MotionEvent.ACTION_UP ||
+            action == MotionEvent.ACTION_DOWN) {
+      int x = (int) event.getX();
+      int y = (int) event.getY();
+
+      x -= widget.getTotalPaddingLeft();
+      y -= widget.getTotalPaddingTop();
+
+      x += widget.getScrollX();
+      y += widget.getScrollY();
+
+      Layout layout = widget.getLayout();
+      int line = layout.getLineForVertical(y);
+      int off = layout.getOffsetForHorizontal(line, x);
+
+      LongClickCopySpan longClickCopySpan[] = buffer.getSpans(off, off, LongClickCopySpan.class);
+      if (longClickCopySpan.length != 0) {
+        LongClickCopySpan aSingleSpan = longClickCopySpan[0];
+        if (action == MotionEvent.ACTION_DOWN) {
+          Selection.setSelection(buffer, buffer.getSpanStart(aSingleSpan),
+                  buffer.getSpanEnd(aSingleSpan));
+          aSingleSpan.setHighlighted(true,
+                  ContextCompat.getColor(widget.getContext(), R.color.touch_highlight));
+        } else {
+          Selection.removeSelection(buffer);
+          aSingleSpan.setHighlighted(false, Color.TRANSPARENT);
+        }
+
+        this.currentSpan = aSingleSpan;
+        this.widget = widget;
+        return gestureDetector.onTouchEvent(event);
+      }
+    } else if (action == MotionEvent.ACTION_CANCEL) {
+      // Remove Selections.
+      LongClickCopySpan[] spans = buffer.getSpans(Selection.getSelectionStart(buffer),
+              Selection.getSelectionEnd(buffer), LongClickCopySpan.class);
+      for (LongClickCopySpan aSpan : spans) {
+        aSpan.setHighlighted(false, Color.TRANSPARENT);
+      }
+      Selection.removeSelection(buffer);
+    }
+    return super.onTouchEvent(widget, buffer, event);
+  }
+
+  public static LongClickMovementMethod getInstance(Context context) {
+    if (sInstance == null) {
+      sInstance = new LongClickMovementMethod(context.getApplicationContext());
+    }
+    return sInstance;
+  }
+}