如何检查Android设备中安装了Whatsapp? [英] How to check Whatsapp is installed in device in android?

问题描述

我想检查whatsapp是否已安装在移动设备中(如果已安装)，则显示已安装"，如果未安装，则显示未安装"，请提供帮助.

I want to check that whether whatsapp is installed in mobile or not if installed then show toast "installed" and if not installed then show Toast "Not Installed".How can I do that Kindly help.

推荐答案

您可以使用此代码.它将检查软件包是否已安装.

You can use this code. It will check if package is installed.

public class Example extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //Put the package name here...
        boolean installed = appInstalledOrNot("com.whatsapp");  
        if(installed) {
            System.out.println("App is already installed on your phone");         
        } else {
            System.out.println("App is not currently installed on your phone");
        }
    }

    private boolean isAppInstalled(String packageName) {
        PackageManager pm = getPackageManager();
        boolean app_installed;
        try {
            pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
            app_installed = true;
        }
        catch (PackageManager.NameNotFoundException e) {
            app_installed = false;
        }
        return app_installed;
    }
}

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