字体大小

private void getzitidaxiao() {

// 创建数据
        final String[] titlle2 = new String[]{"小", "中", "大", "特大"};

        AlertDialog.Builder builder = new AlertDialog.Builder(this);

        builder.setTitle("字体大小")
                .setSingleChoiceItems(titlle2, 0, new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub

                        if (which == 0) {
                            textzt.setText(titlle2[which]);

                            getSharedPreferences("ALER", MODE_PRIVATE).edit().putInt("font", 0).commit();
                            alertDialog.dismiss();
                        } else if (which == 1) {
                            textzt.setText(titlle2[which]);
                            getSharedPreferences("ALER", MODE_PRIVATE).edit().putInt("font", 1).commit();
                            alertDialog.dismiss();
                        } else if (which == 2) {
                            textzt.setText(titlle2[which]);
                            getSharedPreferences("ALER", MODE_PRIVATE).edit().putInt("font", 2).commit();
                            alertDialog.dismiss();
                        }
                        if (which == 3) {
                            textzt.setText(titlle2[which]);
                            getSharedPreferences("ALER", MODE_PRIVATE).edit().putInt("font", 3).commit();
                            alertDialog.dismiss();
                        }

                    }

                });

        builder.setPositiveButton("取消", null);

         alertDialog = builder.create();
        alertDialog.setCanceledOnTouchOutside(true);
        alertDialog.show();
    }

适配器  tv要更改的TextView

if (anInt == 0) {
                tv.setTextSize(TypedValue.COMPLEX_UNIT_PX, 15); //设置45PX
                notifyDataSetChanged();
            } else if (anInt == 1) {
                tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 30); //设置45SP
                notifyDataSetChanged();
            } else if (anInt == 2) {
                tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 46); //设置45SP
                notifyDataSetChanged();
            } else if (anInt == 3) {
                tv.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 58);//设置45DIP
                notifyDataSetChanged();
            }

获取

int anInt = context.getSharedPreferences("ALER",MODE_PRIVATE).getInt("font", 0);