Add InstallerDelegate for watching that a package gets installed

chrome/android/java/src/org/chromium/chrome/browser/banners/InstallerDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/banners/InstallerDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/banners/InstallerDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/banners/InstallerDelegate.java
new file mode 100644
index 0000000000000000000000000000000000000000..3e6fc6061b46f221532675eb0929763d027d8a9f
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/banners/InstallerDelegate.java
@@ -0,0 +1,87 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.banners;
+
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.os.Handler;
+import android.text.TextUtils;
+
+import java.util.List;
+
+/**
+ * Monitors the PackageManager to see when an app has been installed.
+ */
+public class InstallerDelegate implements Runnable {
+    /**
+     * Callback for when the app install has completed.
+     */
+    public static interface Observer {
+        /**
+         * Called when the task has finished.
+         * @param delegate Instance of the class that finished.
+         * @param success  Whether or not the package was successfully installed.
+         */
+        public void onInstallFinished(InstallerDelegate delegate, boolean success);
+    }
+
+    private final PackageManager mPackageManager;
+    private final Observer mObserver;
+    private final String mPackageName;
+    private boolean mIsCancelled;
+
+    /**
+     * Constructs the InstallerDelegate.
+     * @param packageManager Provides access to the list of installed apps.
+     * @param observer       Alerted when the package has been completely installed.
+     * @param packageName    Name of the package for the app to monitor.
+     */
+    InstallerDelegate(PackageManager packageManager, Observer observer, String packageName) {
+        mPackageManager = packageManager;
+        mObserver = observer;
+        mPackageName = packageName;
+    }
+
+    /**
+     * Begins monitoring the package manager for the app install.
+     */
+    @Override
+    public void run() {
+        if (isInstalled()) {
+            mObserver.onInstallFinished(this, true);
+        } else if (mIsCancelled) {
+            mObserver.onInstallFinished(this, false);
+        } else {
+            new Handler().postDelayed(this, 1000);

[Yaron, 2014/02/13 08:45:43]

make member variable

[gone, 2014/02/14 05:16:26]

Well, that took a lot more effort than expected.

+        }
+    }
+
+    /**
+     * Checks if the app has been installed on the system.
+     * @return True if the PackageManager reports that the app is installed, false otherwise.
+     */
+    private boolean isInstalled() {
+        List<PackageInfo> packs = mPackageManager.getInstalledPackages(0);
+        for (int i = 0; i < packs.size(); i++) {
+            if (TextUtils.equals(packs.get(i).packageName, mPackageName)) return true;
+        }
+        return false;
+    }
+
+    /**
+     * Prevent rescheduling the Runnable.
+     */
+    void cancel() {
+        mIsCancelled = true;
+    }
+
+    /**
+     * Checks to see if the Runnable will continue scheduling itself.
+     * @return True if the runnable has not been cancelled.
+     */
+    boolean isRunning() {
+        return !mIsCancelled;
+    }
+}