Add support for webapk without runtimeHost (part 2)

chrome/android/webapk/shell_apk/src/org/chromium/webapk/shell_apk/InstallHostBrowserDialog.java

+// Copyright 2017 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.webapk.shell_apk;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.view.ContextThemeWrapper;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+/** Shows the dialog to install a host browser for launching WebAPK. */
+public class InstallHostBrowserDialog {
+    /**
+     * A listener to receive updates when user chooses to install the host browser, or dismisses the
+     * dialog.

[pkotwicz, 2017/06/05 19:18:20]

Nit: "A listener to receive updates" -> "A listener which is notified"

"receive updates" implies that the listener's methods will be called several
times. In our case in the listener is called exactly oncce.

[Xi Han, 2017/06/06 15:12:28]

Done.

+     */
+    public interface DialogListener {
+        void onConfirmInstall(String packageName);
+        void onConfirmQuit();
+    }
+
+    /**
+     * Shows the dialog to install a host browser.
+     * @param context The current context.
+     * @param listener The listener for the dialog.
+     * @param url URL of the WebAPK for which the dialog is shown.
+     * @param hostBrowserPackageName The package name of the host browser.
+     * @param hostBrowserApplicationName The application name of the host browser.
+     * @param hostBrowserIconId The resource id of the icon of the host browser.
+     */
+    public static void show(Context context, final DialogListener listener, String url,
+            final String hostBrowserPackageName, String hostBrowserApplicationName,
+            int hostBrowserIconId) {
+        View view = LayoutInflater.from(context).inflate(
+                R.layout.choose_host_browser_dialog_list, null);
+        TextView name = (TextView) view.findViewById(R.id.browser_name);
+        ImageView icon = (ImageView) view.findViewById(R.id.browser_icon);
+
+        name.setText(hostBrowserApplicationName);
+        icon.setImageResource(hostBrowserIconId);
+
+        AlertDialog.Builder builder = new AlertDialog.Builder(
+                new ContextThemeWrapper(context, android.R.style.Theme_DeviceDefault_Light_Dialog));
+        builder.setTitle(context.getString(R.string.install_host_browser_dialog_title, url))
+                .setView(view)
+                .setNegativeButton(R.string.choose_host_browser_dialog_quit,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                listener.onConfirmQuit();
+                            }
+                        })
+                .setPositiveButton(R.string.install_host_browser_dialog_install_button,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                listener.onConfirmInstall(hostBrowserPackageName);
+                            }
+                        });
+
+        AlertDialog dialog = builder.create();
+        dialog.show();
+    };
+}