如何使用 Parse 避免安装重复? [英] How to avoid Installation duplicates using Parse?

问题描述

我注意到每次我将我的应用程序部署到我的手机时，它都会在解析中复制安装以接收推送通知.每当我重新安装应用程序时，如何避免这种情况发生?

I've noticed that every time I've deployed my app to my phone,it duplicates the installation in parse to receive push notifications. How can I avoid this from happening whenever I reinstall the app?

推荐答案

经过一周的研究和尝试，我终于找到了一个可行的解决方案.基本上，您需要做两件事来实现这一点:

After a week of research and try and error, I finally found a working solution. Basically, you need to do two things to achieve this:

• 在您的 Android 应用中:在您初始化并保存 ParseInstallation 时传递一些唯一 ID.我们将使用 ANDROID_ID.
• 在解析云代码中:在保存新的安装之前，检查它的唯一 ID 是否存在于旧的安装中.如果是，请删除旧的.

• In your Android app: pass some unique ID when you initialize and save the ParseInstallation. we will use ANDROID_ID.
• In Parse Cloud Code: Before you save a new Installation, check to see if its unique ID exist in an old Installation. If it does, delete the old one.

怎么做:

• 在您的应用程序的 onCreate() 方法中:

//First: get the ANDROID_ID
String android_id = Settings.Secure.getString(this.getContentResolver(), Settings.Secure.ANDROID_ID);
Parse.initialize(this, "APP_ID", "CLIENT_KEY");
//Now: add ANDROID_ID value to your Installation before saving.
ParseInstallation.getCurrentInstallation().put("androidId", android_id);
ParseInstallation.getCurrentInstallation().saveInBackground();

在您的云代码中，添加:

In your cloud code, add this:

Parse.Cloud.beforeSave(Parse.Installation, function(request, response) {
    Parse.Cloud.useMasterKey();
    var androidId = request.object.get("androidId");
    if (androidId == null || androidId == "") {
        console.warn("No androidId found, save and exit");
        response.success();
    }
    var query = new Parse.Query(Parse.Installation);
    query.equalTo("androidId", androidId);
    query.addAscending("createdAt");
    query.find().then(function(results) {
        for (var i = 0; i < results.length; ++i) {
            console.warn("iterating over Installations with androidId= "+ androidId);
            if (results[i].get("installationId") != request.object.get("installationId")) {
                console.warn("Installation["+i+"] and the request have different installationId values. Try to delete. [installationId:" + results[i].get("installationId") + "]");
                results[i].destroy().then(function() {
                    console.warn("Installation["+i+"] has been deleted");
                },
                function() {
                    console.warn("Error: Installation["+i+"] could not be deleted");
                });
            } else {
                console.warn("Installation["+i+"] and the request has the same installationId value. Ignore. [installationId:" + results[i].get("installationId") + "]");
            }
        }
        console.warn("Finished iterating over Installations. A new Installation will be saved now...");
        response.success();
    },
    function(error) {
        response.error("Error: Can't query for Installation objects.");
    });
});

就是这样！

您可能想知道的事情:

• Android 设备没有完美唯一标识符.就我而言，我使用了 ANDROID_ID.你可能会用别的东西.阅读这篇官方文章以获得更好的画面.
• 请注意，在第一次调用 put("androidId", android_id); 后，一个名为 androidId 的新列将添加到您的 Installation Parse App Dashboard 中的表格视图.

• There is no perfect unique identifier for Android devices. In my case, I used ANDROID_ID. You might use something else. Read this official article to get a better picture.
• Note that after calling put("androidId", android_id); for the first time, a new column named androidId will be added to your Installation table view in the Parse App Dashboard.

资源:[1]、[2]、[3]

Resources: [1], [2], [3]

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