ListView on ScrollView

This entry was posted in Android and tagged Listview ScrollView by

Buat custom ListView tanpa fitur scroll.

package al.akh.example.testing.view;
import android.content.Context;
import android.util.AttributeSet;
import android.view.ViewGroup;
import android.widget.ListView;

public class ListViewNonScroll extends ListView {

    public ListViewNonScroll(Context context) {
        super(context);
    }
    public ListViewNonScroll(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public ListViewNonScroll(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }
    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int heightMeasureSpec_custom = MeasureSpec.makeMeasureSpec(
                Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, heightMeasureSpec_custom);
        ViewGroup.LayoutParams params = getLayoutParams();
        params.height = getMeasuredHeight();
    }
}

 

Pada layout resource file, gunakan custom ListView yang telah dibuat di atas.

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fadingEdgeLength="0dp"
    android:fillViewport="true"
    android:overScrollMode="never"
    android:scrollbars="none" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <al.akh.example.testing.view.ListViewNonScroll
            android:id="@+id/list_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/ >

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/list_view" >
            ...
        </RelativeLayout>
    </RelativeLayout>

</ScrollView>

Mount raw file

This entry was posted in Linux and tagged dd Raw File by

Katakanlah kita mempunyai raw file hasil dari dd command.

dd if=/dev/sda of=/mnt/data/backup/akhalos.img

Langkah pertama adalah membuat folder untuk mount file image.

sudo mkdir /mnt/akhalos

Langkah selanjutnya adalah mencari nilai offset sector yang ada pada file image yang nantinya akan digunakan sebagai parameter offset pada perintah mount.

fdisk -l /mnt/data/backup/akhalos.img
Device       Boot Start      End  Sectors Size Id Type
akhalos.img1 *     2048 16777182 16775135   8G 83 Linux

Dari data diatas, didaptkan offset sebesar 2048. Karena nilai setiap sector adalah 512 bytes, maka nilai offset yang didapatkan untuk parameter mount adalah 2048*512 = 1048576. Sehingga, perintah mountnya menjadi:

sudo mount -o loop,offset=1048576 /mnt/data/backup/akhalos.img /mnt/akhalos

3.5inch RPi Display

This entry was posted in RaspberryPi and tagged LCD 3.5 Inch Raspbian RPi Display by

Features

  • 320×480 resolution
  • Resistive touch control
  • Supports any revision of Raspberry Pi (directly-pluggable)
  • Compatible with Raspberry Pi A, B, A+, B+, 2B, 3B, 3B+versions
  • Drivers provided (works with your own Raspbian/Ubuntu directly)
  • Size perfectly fits the Pi
  • High quality immersion gold surface plating
  • Supports Raspbian system, ubuntu system ,kali Linux system

Key Parameters

SKU MPI3501
LCD Type TFT
LCD Interface SPI
Touch Screen Type Resistive
Touch Screen Controller XPT2046
Colors 65536
Backlight LED
Resolution 320*240 (Pixel)
Aspect Ratio 8:5
Backlight Current TBD
Operating Temp. (℃) TBD

Interface

PIN NO. SYMBOL DESCRIPTION
1, 17 3.3V Power positive (3.3V power input)
2, 4 5V Power positive (5V power input)
3, 5, 7, 8, 10, 22 NC NC
6, 9, 14, 20, 25 GND Ground
11 TP_IRQ Touch Panel interrupt, low level while the Touch Panel detects touching
12 KEY1 Key
13 RST Reset
15 LCD_RS LCD instruction control, Instruction/Data Register selection
16 KEY2 KEY
18 KEY3 KEY
19 LCD_SI / TP_SI SPI data input of LCD/Touch Panel
21 TP_SO SPI data output of Touch Panel
23 LCD_SCK / TP_SCK SPI clock of LCD/Touch Panel
24 LCD_CS LCD chip selection, low active
26 TP_CS Touch Panel chip selection, low active

Driver Installation

  • Download raspbian image. 
    https://www.raspberrypi.org/downloads/raspbian/
  • Tulis raspberry image ke sdcard.
  • Buka terminal, install driver lcd pada Raspberry Pi. 
    git clone https://github.com/goodtft/LCD-show.git
chmod -R 755 LCD-show
cd LCD-show/
sudo ./LCD35-show
  • Tunggu beberapa saat, Raspberry Pi akan reboot dengan sendirinya.

Touch screen calibration

Touchscreen dapat dikalibrasi dengan menggunakan program xinput_calibrator.

cd LCD-show/
sudo dpkg -i -B xinput-calibrator_0.7.5-1_armhf.deb

Setelah instalasi selesai, buka Preference->Calibrate Touchscreen. Ikuti perintah yang muncul pada layar. Jika kalibrasi selesai, copy parameter yang dihasilkan pada file 99-calibration.conf, kemudian simpan di folder /ect/X11/xorg.conf.d/.

/ect/X11/xorg.conf.d/99-calibration.conf

Problem Solving

  • Jika touchsreen antara x dan y tertukar, dapat diatasi dengan solusi berikut ini: 
    sudo nano /boot/config.txt
dtoverlay=piscreen,speed=16000000,rotate=90
reboot
  • Jika x axis posisinya dalam keaadan mirror, dapat diatasi dengan solusi memasang evdev. 
    apt-get install xserver-xorg-input-evdev

    Ganti urutan file pada folder /usr/share/X11/xorg.conf.d. Hal ini dilakukan agar konfigurasi evdev tidak tertimpa (overide) dengan konfigurasi libinput. Ganti angka evdev.conf lebih tinggi dari pada libinput.conf.

    cd /usr/share/X11/xorg.conf.d
sudo mv 10-evdev.conf 45-evdev.conf
reboot

Download

Jika kesulitan untuk memasang drivernya, dapat langsung mengunduh image yang sudah disediakan.

 

 

Image Name Version Support Password Download
Raspbian 2018-06-29 PI3B+/A/A+/
B/B+/PI2/PI3/
ZERO/ZERO W		 user:pi
password:raspberry		 MPI3501-Raspbian-20180629.7z
Ubuntu Mate:16.04 PI3,PI2 user:pi
password:raspberry		 3.5inch-RPI3-RPI2-ubuntu-mate-16.04-beta2.7z
Kali-linux 2018.2(nexmon) PI3B+,PI3,PI2 user:root
password:toor		 3.5SPI-kali-linux-2018.2-rpi3B+-nexmon.7z

Cross-compilation Qt 5.9.6 for RaspberryPi

This entry was posted in RaspberryPi and tagged QT Ubuntu by

Persiapan Raspberry Pi

Update package

Edit sources list /etc/apt/sources.list, kemudian uncomment baris deb-src:

sudo nano /etc/apt/sources.list
sudo apt-get update
sudo apt-get dist-upgrade
sudo reboot

Update Raspberry Pi firmware

sudo rpi-update
sudo reboot

Install dependencies

sudo apt-get build-dep qt4-x11
sudo apt-get build-dep libqt5gui5
sudo apt-get install libudev-dev libinput-dev libts-dev libxcb-xinerama0-dev libxcb-xinerama0

Persiapan Linux Host

Pada tutorial ini digunakan Ubuntu 16.04 x64.

Update package

sudo apt-get update
sudo apt-get -y upgrade

Install dependencies

sudo apt-get install git bison python gperf

Buat folder kerja

sudo mkdir /opt/qt5pi
sudo chown akhal:akhal /opt/qt5pi
cd /opt/qt5pi

Clone toolchain

git clone https://github.com/raspberrypi/tools

Tambahkan toolchain binary di variabel PATH

nano ~/.bashrc

Tambahkan baris berikut:

export PATH=$PATH:/opt/qt5pi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin

Download QT Source

https://download.qt.io/official_releases/qt/5.9/5.9.6/single/qt-everywhere-opensource-src-5.9.6.tar.xz

Untar QT source

tar -xvf t-everywhere-opensource-src-5.9.6.tar.xz

Buat hf configuration

cp -R qt-everywhere-opensource-src-5.9.6/qtbase/mkspecs/linux-arm-gnueabi-g++ qt-everywhere-opensource-src-5.9.6/qtbase/mkspecs/linux-arm-gnueabihf-g++
sed -i -e 's/arm-linux-gnueabi-/arm-linux-gnueabihf-/g' qt-everywhere-opensource-src-5.9.6/qtbase/mkspecs/linux-arm-gnueabihf-g++/qmake.conf

Copy raspberry pi sysroot

mkdir sysroot sysroot/usr sysroot/opt
rsync -avz akhal@192.168.1.100:/lib sysroot
rsync -avz akhal@192.168.1.100:/usr/include sysroot/usr
rsync -avz akhal@192.168.1.100:/usr/lib sysroot/usr
rsync -avz akhal@192.168.1.100:/opt/vc sysroot/opt

Buat symlinks to “missing” libraries

mv sysroot/usr/lib/arm-linux-gnueabihf/libEGL.so.1.0.0 sysroot/usr/lib/arm-linux-gnueabihf/libEGL.so.1.0.0_backup
ln -s sysroot/opt/vc/lib/libEGL.so sysroot/usr/lib/arm-linux-gnueabihf/libEGL.so.1.0.0
mv sysroot/usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0 sysroot/usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0_backup
ln -s sysroot/opt/vc/lib/libGLESv2.so sysroot/usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0
ln -s sysroot/opt/vc/lib/libEGL.so sysroot/opt/vc/lib/libEGL.so.1
ln -s sysroot/opt/vc/lib/libGLESv2.so sysroot/opt/vc/lib/libGLESv2.so.2

Ganti absolute symlinks dalam bentuk relative symlinks

wget https://raw.githubusercontent.com/riscv/riscv-poky/master/scripts/sysroot-relativelinks.py
chmod +x sysroot-relativelinks.py
./sysroot-relativelinks.py sysroot

Buat folder untuk build

mkdir qt5build
cd qt5build

Konfigurasi QT Source

../qt-everywhere-opensource-src-5.9.6/configure -opengl es2 -device linux-rasp-pi-g++ -device-option CROSS_COMPILE=arm-linux-gnueabihf- -sysroot /opt/qt5pi/sysroot -prefix /usr/local/qt5pi -opensource -confirm-license -skip qtwebengine -skip qtscript -nomake examples -make libs -v

Jika muncul error unknown CPU architecture ketika konfigurasi, tambahkan baris -no-use-gold-linker sehingga menjadi:

../qt-everywhere-opensource-src-5.9.6/configure -opengl es2 -device linux-rasp-pi-g++ -device-option CROSS_COMPILE=arm-linux-gnueabihf- -sysroot /opt/qt5pi/sysroot -prefix /usr/local/qt5pi -opensource -confirm-license -skip qtwebengine -skip qtscript -nomake examples -make libs -v -no-use-gold-linker

Make

Jika konfigurasi sudah selesai, jalankan perintah make.

make
make install

Upload hasil compile ke Raspberry Pi

cd /opt/qt5pi
rsync -avz sysroot/usr/local/qt5pi akhal@192.168.1.100:/usr/local

Konfigurasi Pada QT Creator

Install QT

Konfigurasi toolkit

Buka QT Creator, kemudian pilih option dan tambahkan parameter-parameter berikut:

  • Tools->Options…->Devices->Add
    Generic Linux Device
    Edit host, username, dan password.
  • Tools->Build&Run->Debuggers->Add
    Edit name dan path ( /opt/qt5pi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-gdb )
  • Tools->Compilers->Add->GCC->C
    Edit name dan path ( /opt/qt5pi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-gcc )
  • Tools->Compilers->Add->GCC->C++
    Edit name dan path ( /opt/qt5pi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-g++ )
  • Tools->Qt Versions->Add
    Pilih /opt/qt5pi/sysroot/usr/local/qt5pi/bin/qmake
  • Tools->Kits->Add
    Edit name
    Device type: Generic Linux Device
    Device: raspberry pi device
    Sysroot: Choose /opt/qt5pi/sysroot
    C and C++: Choose prior created raspberry pi compilers
    Debugger: Choose prior created raspberry pi debugger
    Qt version: Choose prior created raspberry pi qt version

Selesai

SSH login as root

This entry was posted in RaspberryPi and tagged SSH by

Jika ingin login menggunakan ssh sebagai root pada raspberry pi, perlu mengganti file config untuk sshd.

  • login, kemudian edit file config untuk sshd. 
    sudo nano /etc/ssh/sshd_config
  • Cari baris PermitRootLogin prohibit-password, kemudian ganti menjadi PermitRootLogin yes
  • Tutup file & simpan.
  • Reboot

Configure Static IP Addresses on Ubuntu 18.04 LTS Server

This entry was posted in Linux and tagged Ubuntu by

Untuk mengganti ip pada Ubuntu server 18.04, dapat menggunakan NetPlan. Pertama-tama, lihat network device dengan menggunakan perintah ip addr. Misal yang akan diganti adalah eth0.
Langkah selanjutnya buat file 01-netcfg.yaml di folder /etc/netplan.

sudo nano /etc/netplan/01-netcfg.yaml

Untuk mengganti ip address, tuliskan baris berikut:

# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
 version: 2
 renderer: networkd
 ethernets:
   eth0:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.1.2/24]
     gateway4: 192.168.1.1
     nameservers:
       addresses: [8.8.8.8,8.8.4.4]

Keluar dari editor, kemudian jalankan command berikut ini:

sudo netplan apply

Locale Issue on Ubuntu

This entry was posted in Linux and tagged Ubuntu by

Error message:

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LC_TIME = "id_ID.UTF-8",
        LC_MONETARY = "id_ID.UTF-8",
        LC_ADDRESS = "id_ID.UTF-8",
        LC_TELEPHONE = "id_ID.UTF-8",
        LC_NAME = "id_ID.UTF-8",
        LC_MEASUREMENT = "id_ID.UTF-8",
        LC_IDENTIFICATION = "id_ID.UTF-8",
        LC_NUMERIC = "id_ID.UTF-8",
        LC_PAPER = "id_ID.UTF-8",
        LANG = "en_US.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to a fallback locale ("en_US.UTF-8").
locale: Cannot set LC_ALL to default locale: No such file or directory

Edit bashrc:

nano ~/.bashrc

Tambahkan code berikut:

export LC_ALL="en_US.UTF-8"

Fujitsu Touchpad Not Working In Ubuntu 18.04

This entry was posted in Linux and tagged Touchpad Ubuntu by

Untuk mengatasi masalah touchpad yang tidak berfungsi, dapat dilakukan dengan menambahkan i8042.notimeout i8042.nomux pada grub.
Edit parameter grub.

sudo gedit /etc/default/grub

Edit baris berikut GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" sehingga menjadi:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i8042.notimeout i8042.nomux"

Update grub:

sudo update-grub

Langkah terakhir, reboot system.

Custom ActionBar on Android

This entry was posted in Android by

Buat activity untuk ActionBar. Misal saya beri nama custom_actionbar_center.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="@android:color/transparent">

    <TextView
        android:id="@+id/title_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:textSize="25sp"
        android:textColor="#fff"
        android:gravity="center"
        android:text="title"
        />

    <ImageButton
        android:id="@+id/ibtn_bluetooth"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginRight="15dp"
        android:layout_alignParentRight="true"
        android:foregroundGravity="center"
        android:background="@null"
        android:src="@drawable/ic_settings_white_32dp" />

</RelativeLayout>

Tambahkan code berikut pada activity

ActionBar mActionBar = getSupportActionBar();
assert mActionBar != null;
mActionBar.setDisplayShowHomeEnabled(false);
mActionBar.setDisplayShowTitleEnabled(false);
LayoutInflater mInflater = LayoutInflater.from(this);
View actionBar = mInflater.inflate(R.layout.custom_actionbar_center, null);
TextView mTitleTextView = actionBar.findViewById(R.id.title_text);
mTitleTextView.setText(R.string.app_name);
mActionBar.setCustomView(actionBar);
mActionBar.setDisplayShowCustomEnabled(true);
((Toolbar) actionBar.getParent()).setContentInsetsAbsolute(0,0);

Jika ingin menghilangkan shadow di bawah ActionBar, tambahkan code berikut pada activity:

getSupportActionBar().setElevation(0);

How to Fix Time Differences in Ubuntu 16.04 and Windows 10 Dual Boot

This entry was posted in Linux and tagged Dual Boot Local Time UTC Windows 10 by

Untuk mengatasi masalah perbedaan waktu ketika dual boot antara ubuntu dan windows, dapat dilakukan dengan cara menonaktifkan UTC dan menggunakan local time. Berikut adalah langkah-langkahnya:

  • Buka terminal, kemudian jalankan command berikut: 
    timedatectl set-local-rtc 1 --adjust-system-clock
  • Cek apakah sudah berubah menjadi local time, dengan menggunakan command berikut: 
    timedatectl
  • reboot