Question

我试图在用户点击imageview时打开Facebook页面..但如果安装了应用程序然后它工作正常，但我想要的是如果没有安装应用程序然后它应该在浏览器中打开，以下是我的代码。

   iv_fb.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {


            boolean installed = appInstalledOrNot("fb://page/pageid");  
            if(installed) {
                //This intent will help you to launch if the package is already installed
               /* Intent LaunchIntent = getPackageManager()
                    .getLaunchIntentForPackage("com.facebook.katana");*/

                startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("fb://page/pageid")));
                ContactActivity.this.finish();
               // startActivity(LaunchIntent);

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

            // TODO Auto-generated method stub

        }
    });

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

Answer 1

我使用这种方法：

如果安装了应用，请创建一个chek的方法：

private boolean isPackageInstalled(String packagename, Context context) {
        PackageManager pm = context.getPackageManager();
        try {
            pm.getPackageInfo(packagename, PackageManager.GET_ACTIVITIES);
            return true;
        } catch (NameNotFoundException e) {
            return false;
        }
    }

如果未安装应用，请将浏览器打开到您想要的页面。

boolean FBInstalled = isPackageInstalled("com.facebook.katana",context);
            if(FBInstalled){
                //do your stuff with the application
            }else{
                Intent i = new Intent(Intent.ACTION_VIEW,Uri.parse(YOUR_SITE_URL));
                startActivity(i);
            }

Answer 2

尝试添加

 } else {
  Intent viewWebPage = new Intent(Intent.ACTION_VIEW, 
  Uri.parse("The url of the page you want to open if app isn't installed"));
  startActivity(viewWebPage);

 System.out.println("App is not currently installed on your device ");
            }

        }

如果未安装facebook应用程序，则应在浏览器中打开

2 个答案: