Question

创建BroadcastReceiver，在安装/卸载任何应用程序时显示应用程序名称和版本号。但我通过intent.getData()获取包名。但是当我试图使用packagemanager找到该应用程序的名称时，它会在所有安装/卸载/替换的情况下抛出异常。可能存在的问题是什么？如何解决？

代码：

    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.content.pm.ApplicationInfo;
    import android.content.pm.PackageManager;
    import android.widget.Toast;

public class ApplicationStatusNotification extends BroadcastReceiver {

    /**
     * This method receives message for any application status(Install/ Uninstall) and display details.
     */
    @Override
    public void onReceive(Context context, Intent intent) {

        // Get application status(Install/ Uninstall)
        boolean applicationStatus = intent.getBooleanExtra(Intent.EXTRA_REPLACING, false);
        String toastMessage = null;

        // Check if the application is install or uninstall and display the message accordingly
        if(intent.getAction().equals("android.intent.action.PACKAGE_INSTALL")){
            // Application Install
            toastMessage = "PACKAGE_INSTALL: "+  intent.getData().toString() + getApplicationName(context, intent.getData().toString(), PackageManager.GET_UNINSTALLED_PACKAGES);
        }else if(intent.getAction().equals("android.intent.action.PACKAGE_REMOVED")){
            // Application Uninstall
            toastMessage = "PACKAGE_REMOVED: "+  intent.getData().toString() + getApplicationName(context, intent.getData().toString(), PackageManager.GET_UNINSTALLED_PACKAGES);
        }else if(intent.getAction().equals("android.intent.action.PACKAGE_REPLACED")){
            // Application Replaced
            toastMessage = "PACKAGE_REPLACED: "+  intent.getData().toString() + getApplicationName(context, intent.getData().toString(), PackageManager.GET_UNINSTALLED_PACKAGES);
        }

        //Display Toast Message
        if(toastMessage != null){
            Toast.makeText(context, toastMessage, Toast.LENGTH_LONG).show();
        }
    }

    /**
     * This method get application name name from application package name
     */
    private String getApplicationName(Context context, String data, int flag) {

        final PackageManager pckManager = context.getPackageManager();
        ApplicationInfo applicationInformation;
        try {
            applicationInformation = pckManager.getApplicationInfo(data, flag);
        } catch (PackageManager.NameNotFoundException e) {
            applicationInformation = null;
        }
        final String applicationName = (String) (applicationInformation != null ? pckManager.getApplicationLabel(applicationInformation) : "(unknown)");

        return applicationName;
    }
}

Answer 1

我遵循this示例，其中引入了BroadcastReceiver，如下所示;

<receiver android:name="PackageChangeReceiver">
    <intent-filter>
        <action android:name="android.intent.action.PACKAGE_ADDED"/>
        <action android:name="android.intent.action.PACKAGE_REPLACED"/>
        <action android:name="android.intent.action.PACKAGE_REMOVED"/>
        <data android:scheme="package"/>
    </intent-filter>
</receiver>

现在一旦调用了PackageChangeReceiver.onReceive（..），Intent.getData（）就会包含一些内容;由Uri.toString（）返回的package:my.test.package。要使用PackageManager搜索此ApplicationInfo，您应该只提取可以由Uri.getSchemeSpecificPart()检索的包名称，该名称只能为您提供my.test.package。

此外，基于快速测试，删除包后很可能不再有ApplicationInfo可用。

创建BroadcastReceiver，在安装/卸载任何应用程序时显示应用程序名称和版本号？

1 个答案: