1 files changed, 139 insertions, 0 deletions
diff --git a/subsonic-android/src/net/sourceforge/subsonic/androidapp/util/ModalBackgroundTask.java b/subsonic-android/src/net/sourceforge/subsonic/androidapp/util/ModalBackgroundTask.java
new file mode 100644
index 00000000..15e2add2
--- /dev/null
+++ b/subsonic-android/src/net/sourceforge/subsonic/androidapp/util/ModalBackgroundTask.java
@@ -0,0 +1,139 @@
+/*
+ This file is part of Subsonic.
+
+ Subsonic is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Subsonic is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Subsonic.  If not, see <http://www.gnu.org/licenses/>.
+
+ Copyright 2009 (C) Sindre Mehus
+ */
+package net.sourceforge.subsonic.androidapp.util;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
+import android.util.Log;
+import net.sourceforge.subsonic.androidapp.R;
+
+/**
+ * @author Sindre Mehus
+ */
+public abstract class ModalBackgroundTask<T> extends BackgroundTask<T> {
+
+    private static final String TAG = ModalBackgroundTask.class.getSimpleName();
+
+    private final AlertDialog progressDialog;
+    private Thread thread;
+    private final boolean finishActivityOnCancel;
+    private boolean cancelled;
+
+    public ModalBackgroundTask(Activity activity, boolean finishActivityOnCancel) {
+        super(activity);
+        this.finishActivityOnCancel = finishActivityOnCancel;
+        progressDialog = createProgressDialog();
+    }
+
+    public ModalBackgroundTask(Activity activity) {
+        this(activity, true);
+    }
+
+    private AlertDialog createProgressDialog() {
+        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+        builder.setIcon(android.R.drawable.ic_dialog_info);
+        builder.setTitle(R.string.background_task_wait);
+        builder.setMessage(R.string.background_task_loading);
+        builder.setCancelable(true);
+        builder.setOnCancelListener(new DialogInterface.OnCancelListener() {
+            @Override
+            public void onCancel(DialogInterface dialogInterface) {
+                cancel();
+            }
+        });
+        builder.setPositiveButton(R.string.common_cancel, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialogInterface, int i) {
+                cancel();
+            }
+        });
+
+        return builder.create();
+    }
+
+    public void execute() {
+        cancelled = false;
+        progressDialog.show();
+
+        thread = new Thread() {
+            @Override
+            public void run() {
+                try {
+                    final T result = doInBackground();
+                    if (cancelled) {
+                        progressDialog.dismiss();
+                        return;
+                    }
+
+                    getHandler().post(new Runnable() {
+                        @Override
+                        public void run() {
+                            progressDialog.dismiss();
+                            done(result);
+                        }
+                    });
+
+                } catch (final Throwable t) {
+                    if (cancelled) {
+                        return;
+                    }
+                    getHandler().post(new Runnable() {
+                        @Override
+                        public void run() {
+                            progressDialog.dismiss();
+                            error(t);
+                        }
+                    });
+                }
+            }
+        };
+        thread.start();
+    }
+
+    protected void cancel() {
+        cancelled = true;
+        if (thread != null) {
+            thread.interrupt();
+        }
+
+        if (finishActivityOnCancel) {
+            getActivity().finish();
+        }
+    }
+
+    protected boolean isCancelled() {
+        return cancelled;
+    }
+
+    protected void error(Throwable error) {
+        Log.w(TAG, "Got exception: " + error, error);
+        new ErrorDialog(getActivity(), getErrorMessage(error), finishActivityOnCancel);
+    }
+
+    @Override
+    public void updateProgress(final String message) {
+        getHandler().post(new Runnable() {
+            @Override
+            public void run() {
+                progressDialog.setMessage(message);
+            }
+        });
+    }
+}