如何检查facebook应用程序是否安装在我的设备中[重复]

Question

我创建了一个android照片应用程序，并在其中添加了使用intent在facebook、twitter、instagram上共享图像的功能，但当我共享图像时，如果设备上未安装facebook、twitter、instagram应用程序，该应用程序将崩溃。

Answer 1

看到这个问题。它会给你你想要的。只需将包名替换为com.facebook.android或com.facebook.katana

守则：

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.Ch.Example.pack");  
        if(installed) {
            //This intent will help you to launch if the package is already installed
            Intent LaunchIntent = getPackageManager()
                .getLaunchIntentForPackage("com.facebook.katana");//if this name does not work provide the other one
            startActivity(LaunchIntent);

            System.out.println("App already installed on your phone");        
        }
        else {
            System.out.println("App is not installed on your phone");
        }
    }

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