android 实用代码片段

站在巨人的肩膀上，该文章代码皆从网上总结而来。

1.创建AlertDialog

public void showDeleteDialog() {AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setMessage("Are you sure want to delete?").setCancelable(false)///back按键.setPositiveButton("Yes", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int id) {// TODO Auto-generated method stubstartDelete();}}).setNegativeButton("No", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int id) {// TODO Auto-generated method stubdialog.cancel();}}).show();AlertDialog alert = builder.create();}

 2.getRootView()获取Activity root View (相对应于setContentView)

    private static View getRootView(Activity context)      {          return ((ViewGroup)context.findViewById(android.R.id.content)).getChildAt(0);      }