Android共有機能の実現

protected void shareApk(){
    //1.    
    Intent intent = new Intent("android.intent.action.SEND");
    intent.addCategory("android.intent.category.DEFAULT");
    intent.setType("text/plain");
    intent.putExtra(Intent.EXTRA_TEXT, "Don't be worry.Be happy!");
    startActivity(intent);
    //2.    
    //     
}