解决使用默认的UpdateDialogFragment在初次安装应用时候，因为DownloadService没有能使用activity.s…

update-app/src/main/java/com/vector/update_app/SilenceUpdateCallback.java

@@ -53,6 +53,11 @@ public boolean onFinish(File file) {
                 public void onError(String msg) {
 
                 }
+
+                @Override
+                public boolean onInstallAppAndAppOnForeground(File file) {
+                    return false;
+                }
             });
         }
     }

update-app/src/main/java/com/vector/update_app/UpdateDialogFragment.java

@@ -387,6 +387,7 @@ public boolean onFinish(final File file) {
                                 @Override
                                 public void onClick(View v) {
                                     AppUpdateUtils.installApp(UpdateDialogFragment.this, file);
+                                    dismiss();
                                 }
                             });
                         } else {
@@ -402,6 +403,14 @@ public void onError(String msg) {
                         dismissAllowingStateLoss();
                     }
                 }
+
+                @Override
+                public boolean onInstallAppAndAppOnForeground(File file) {
+                    // 如果应用处于前台，那么就自行处理应用安装
+                    AppUpdateUtils.installApp(UpdateDialogFragment.this.getActivity(), file);
+                    dismiss();
+                    return true;
+                }
             });
         }
     }

update-app/src/main/java/com/vector/update_app/service/DownloadService.java

@@ -189,6 +189,14 @@ public interface DownloadCallback {
          * @param msg 异常信息
          */
         void onError(String msg);
+
+        /**
+         * 当应用处于前台，准备执行安装程序时候的回调，
+         *
+         * @param file
+         * @return
+         */
+        boolean onInstallAppAndAppOnForeground(File file);
     }
 
     /**
@@ -283,7 +291,10 @@ public void onResponse(File file) {
                 if (AppUpdateUtils.isAppOnForeground(DownloadService.this) || mBuilder == null) {
                     //App前台运行
                     mNotificationManager.cancel(NOTIFY_ID);
-                    AppUpdateUtils.installApp(DownloadService.this, file);
+                    boolean temp = mCallBack.onInstallAppAndAppOnForeground(file);
+                    if (!temp) {
+                        AppUpdateUtils.installApp(DownloadService.this, file);
+                    }
                 } else {
                     //App后台运行
                     //更新参数,注意flags要使用FLAG_UPDATE_CURRENT

update-app/src/main/java/com/vector/update_app/utils/AppUpdateUtils.java

@@ -96,6 +96,28 @@ public static boolean installApp(Context context, File appFile) {
         return false;
     }
 
+    public static boolean installApp(Activity activity, File appFile) {
+        try {
+            Intent intent = new Intent(Intent.ACTION_VIEW);
+            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+                Uri fileUri = FileProvider.getUriForFile(activity, activity.getApplicationContext().getPackageName() + ".fileProvider", appFile);
+                intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+                intent.setDataAndType(fileUri, "application/vnd.android.package-archive");
+            } else {
+                intent.setDataAndType(Uri.fromFile(appFile), "application/vnd.android.package-archive");
+            }
+            if (activity.getPackageManager().queryIntentActivities(intent, 0).size() > 0) {
+                activity.startActivityForResult(intent, REQ_CODE_INSTALL_APP);
+            }
+            return true;
+        } catch (Exception e) {
+            // TODO 后续可以考虑这种情况应该通知应用开发者
+            e.printStackTrace();
+        }
+        return false;
+    }
+
     public static boolean installApp(Fragment fragment, File appFile) {
         try {
             final Activity activity = fragment.getActivity();