dependencies - How to make an Android app that depends on another app? -

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if create app depends on app or apps (eg: facebook , twitter apps), yet not installed, there method of checking dependencies , installing them @ same time own app?

i did in application requires zxing scanner app installed. want inside onclick or ontouch:

try{     intent intent = new intent("com.google.zxing.client.android.scan");     intent.setpackage("com.google.zxing.client.android");     startactivityforresult(intent, 0); } catch (exception e) {     createalert("barcode scanner not installed!", "this application uses " +     "the open source barcode scanner zxing team, need install " +     "this before can use software!", true); }

which calls

public void createalert(string title, string message, boolean button) {     // http://androidideasblog.blogspot.com/2010/02/how-to-add-messagebox-in-android.html     alertdialog alertdialog;     alertdialog = new alertdialog.builder(this).create();     alertdialog.settitle(title);     alertdialog.setmessage(message);     if ((button == true)) {         alertdialog.setbutton("download now",         new dialoginterface.onclicklistener() {             public void onclick(dialoginterface arg0, int arg1) {                 intent browserintent = new intent(                     intent.action_view,                     uri.parse("market://search?q=pname:com.google.zxing.client.android"));                 startactivity(browserintent);             }         });     }     alertdialog.show(); }

then after sorting out code out realise asked installed @ same time app. not sure if should post code, may helpful


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