Load QR Code asynchronously and with a fade in animation

1 files changed, 41 insertions, 5 deletions

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyShareFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyShareFragment.java
index 52b573f47..46cd7e25b 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyShareFragment.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyShareFragment.java
@@ -19,8 +19,16 @@ package org.sufficientlysecure.keychain.ui;
 
 import android.annotation.TargetApi;
 import android.content.Intent;
+import android.content.res.Resources;
 import android.database.Cursor;
+import android.graphics.Bitmap;
+import android.graphics.Color;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.TransitionDrawable;
 import android.net.Uri;
+import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
 import android.provider.Settings;
@@ -152,7 +160,7 @@ public class ViewKeyShareFragment extends LoaderFragment implements
                         KeyRings.buildUnifiedKeyRingUri(dataUri),
                         Keys.FINGERPRINT, ProviderHelper.FIELD_TYPE_BLOB);
                 String fingerprint = PgpKeyHelper.convertFingerprintToHex(data);
-                if(!toClipboard){
+                if (!toClipboard) {
                     content = Constants.FINGERPRINT_SCHEME + ":" + fingerprint;
                 } else {
                     content = fingerprint;
@@ -292,10 +300,7 @@ public class ViewKeyShareFragment extends LoaderFragment implements
                     String fingerprint = PgpKeyHelper.convertFingerprintToHex(fingerprintBlob);
                     mFingerprint.setText(PgpKeyHelper.colorizeFingerprint(fingerprint));
 
-                    String qrCodeContent = Constants.FINGERPRINT_SCHEME + ":" + fingerprint;
-                    mFingerprintQrCode.setImageBitmap(
-                            QrCodeUtils.getQRCodeBitmap(qrCodeContent, QR_CODE_SIZE)
-                    );
+                    loadQrCode(fingerprint);
 
                     break;
                 }
@@ -311,4 +316,35 @@ public class ViewKeyShareFragment extends LoaderFragment implements
      */
     public void onLoaderReset(Loader<Cursor> loader) {
     }
+
+    /**
+     * Load QR Code asynchronously and with a fade in animation
+     *
+     * @param fingerprint
+     */
+    private void loadQrCode(final String fingerprint) {
+        AsyncTask<Void, Void, Bitmap> loadTask =
+                new AsyncTask<Void, Void, Bitmap>() {
+                    protected Bitmap doInBackground(Void... unused) {
+                        String qrCodeContent = Constants.FINGERPRINT_SCHEME + ":" + fingerprint;
+                        return QrCodeUtils.getQRCodeBitmap(qrCodeContent, QR_CODE_SIZE);
+                    }
+
+                    protected void onPostExecute(Bitmap qrCode) {
+                        mFingerprintQrCode.setImageBitmap(qrCode);
+
+                        // Transition drawable with a transparent drawable and the final bitmap
+                        final TransitionDrawable td =
+                                new TransitionDrawable(new Drawable[]{
+                                        new ColorDrawable(Color.TRANSPARENT),
+                                        new BitmapDrawable(getResources(), qrCode)
+                                });
+
+                        mFingerprintQrCode.setImageDrawable(td);
+                        td.startTransition(200);
+                    }
+                };
+
+        loadTask.execute();
+    }
 }