簡單的AlertDialog

AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle("ALERTTILESTRING")
        .setMessage("alertNameString")
        .setCancelable(false)
        .setNegativeButton("Close",new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                dialog.cancel();
            }
        });
        AlertDialog alert = builder.create();
        alert.show();
    }

將圖片id快速加到陣列

public void imgIdtoArray() {
        ArrayList Icon = new ArrayList<>();
        
        //假設有50張圖
        for (int i = 0; i < 50; i++) {
            //每張圖片的檔名 → no_1,no_2,no_3.....
            String name = "no_" + i; 
            ballIcon.add(getResources()
               .getIdentifier(name, "drawable", getPackageName()));
        }
    }