Categories: AndroidJava

Fungsi berguna di android studio java

Bismillahirrohmaanirrohiim…

Di bawah ini adalah beberapa fungsi yang berguna untuk program java di android studio.

Unik ID berupa string
public String getId() {
    Random r = new Random();
    long unixTime = System.currentTimeMillis();// / 1000L;
    int rmin = 1;
    int rmax = 9999;

    String unikid = Long.toString(unixTime) + Integer.toString(r.nextInt(rmax - rmin) + rmin);

    return unikid;
}
Unik ID berupa integer
public int getIdInt() {
    Random r = new Random();
    int idx = (int)System.currentTimeMillis();
    int rmin = 1;
    int rmax = 9999;

    int unikid = idx + (r.nextInt(rmax - rmin) + rmin);

    return unikid;
}
Mendapatkan info device
public String getDeviceInfoStr() {
    String devinfo = "";
    devinfo += "|SDK: " + String.valueOf(Build.VERSION.SDK_INT);
    devinfo += "|VERSION: " + Build.VERSION.RELEASE;
    devinfo += "|BRAND: " + Build.BRAND;
    devinfo += "|MANUFACTURER: " + Build.MANUFACTURER;
    devinfo += "|MODEL: " + Build.MODEL;
    devinfo += "|ID: " + Build.ID;
    devinfo += "|SERIAL: " + Build.SERIAL;
    /*
    Log.i("TAGG", "SERIAL: " + Build.SERIAL);
    Log.i("TAGG","MODEL: " + Build.MODEL);
    Log.i("TAGG","ID: " + Build.ID);
    Log.i("TAGG","Manufacture: " + Build.MANUFACTURER);
    Log.i("TAGG","PRODUCT: " + Build.PRODUCT);
    Log.i("TAGG","type: " + Build.TYPE);
    Log.i("TAGG","user: " + Build.USER);
    Log.i("TAGG","BASE: " + Build.VERSION_CODES.BASE);
    Log.i("TAGG","INCREMENTAL " + Build.VERSION.INCREMENTAL);
    Log.i("TAGG","SDK  " + Build.VERSION.SDK_INT);
    Log.i("TAGG","BOARD: " + Build.BOARD);
    Log.i("TAGG","BOOTLOADER: " + Build.BOOTLOADER);
    Log.i("TAGG","BRAND " + Build.BRAND);
    Log.i("TAGG","HOST " + Build.HOST);
    Log.i("TAGG","FINGERPRINT: "+Build.FINGERPRINT);
    Log.i("TAGG","Version Code: " + Build.VERSION.RELEASE);
    Log.i("TAGG","DEVICE: " + Build.DEVICE);
    Log.i("TAGG","DISPLAY: " + Build.DISPLAY);
    Log.i("TAGG","HARDWARE: " + Build.HARDWARE);
    Log.i("TAGG","TAGS: " + Build.TAGS);

     */    return devinfo;
}
Mendapatkan tanggal sekarang
public String dateNow(String formatdate) {
    //return "yyyyMMdd"
    SimpleDateFormat sdf = new SimpleDateFormat(formatdate);
    return sdf.format(new Date());
}
public String getCurrentDate() {
    Calendar cal = Calendar.getInstance();

    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String formattedDate = df.format(cal.getTime());

    return formattedDate;
}
Merubah format tanggal di android
String getdateFmt = '2020-9-3';//tgl 3 sept 2020

SimpleDateFormat fromUser = new SimpleDateFormat("yyyy-M-d");
SimpleDateFormat myFormat = new SimpleDateFormat("dd MMMM yyyy");
try {
    getdateFmt = myFormat.format(fromUser.parse(getdate));
} catch (ParseException e) {
    e.printStackTrace();
}
Sleep di android studio java
Handler handler = new Handler(); 
handler.postDelayed(new Runnable() {
     @Override 
     public void run() { 
          //perintah di sini 
     } 
}, 1000);//1 detik
Menambah textview secara dinamis dengan java
private void addTextView() {
    //llObj = linear layout obj
    int numChild = llObj.getChildCount();

    TextView textView = new TextView(this);
    textView.setText("tambahan baru. Jum Child: "+numChild);
    llObj.addView(textView, 0);
    //0 adalah index, jadi posisi paling atas (prepend). kl dikosongi nanti textview akan ditaruh di paling bawah

    if (numChild>= 10) {
        //hapus bari paling bawah, shg tdk memanjang unlimited
        llResponse.removeViewAt(10);
    }
}
Extract json menjadi teks
String options = '{"data1":"value1","data2":"value2"}';
try {
    JSONObject jo = new JSONObject(options);
    String data1= jo.getString("data1");
} catch (JSONException e) {
    //e.printStackTrace();
    //e.getMessage()
}
Extract json multidimensi untuk mendapatkan iterasi key value
String options = '{"nama":"rudi","kendaraan":{"satu":"mobil","dua":"motor"}}';
try {
    JSONObject jo = new JSONObject(options);
    String data1= jo.getString("nama");
} catch (JSONException e) {
    //e.printStackTrace();
    //e.getMessage()
}

//ada dua cara

//cara pertama
JSONObject pp = null;
HashMap<String, Object> map = new HashMap<>();

try {
    pp = jo.getJSONObject("kendaraan");
    //String value1 = pp.getString("satu");//ini bisa diambil kalau kunci sudah diketahui, hasilnya=>mobil
    Iterator<String> iter = pp.keys();
    while (iter.hasNext()) {
        String key = iter.next();
        map.put(key, pp.get(key));
    }
} catch (JSONException e) {
    e.printStackTrace();
}

//cara kedua

JSONArray pparr = null;
try {
    pparr = jo.getJSONArray("post_params");
    for (int i=0;i<pparr.length();i++) {
        JSONObject jsonObj = pparr.getJSONObject(i);
        String k = jsonObj.keys().next();
        String v = jsonObj.getString(k);
    }
} catch (JSONException e) {
    e.printStackTrace();
}
Mendapatkan key dan value HashMap
Map<String, String> map = new HashMap<String, String>();
    map.put("key1", "value1");
    map.put("key2", "value2");
    for (Map.Entry<String, String> entry : map.entrySet()) {
        System.out.println(entry.getKey() + " = " + entry.getValue());
    }

 

Kemungkinan posting ini akan terus diupdate seiring perkembangan perkodingan.

Terimakasih semoga berguna.

Bagikan
rasupe

Share
Published by
rasupe

Recent Posts

Template Blogger Blogspot Gratis dan Bagus

Bismillaahirrohmaanirrohiim... Berikut ini beberapa template blogspot yang dapat anda gunakan secara gratis namun tampilannya bagus.…

2 weeks ago

MySQL error di xampp phpmyadmin dengan tabel “inuse”

Bismillaahirrohmaanirrohiim... Bagi yang menggunakan xampp, mungkin sudah familiar dengan database mysql dan web base phpmyadmin.…

2 weeks ago

Solusi CPU usage 100% karena root/.x/static

Bismillaahirrohmaanirrohiim... Bagi pengguna server linux, adakalanya kena serangan hacker, dimana servernya digunakan untuk menjalankan aksi…

1 month ago

Teks panjang jadi titik-titik dengan css

Bismillaahirrohmaanirrohiim... Saat kita membuat kotak dengan lebar dan tinggi tertentu, tentunya teks didalamnya harus kita…

3 months ago

Bekerja dengan clearfix di css untuk posisi gambar dan teks dalam kotak

Bismillaahirrohmaanirrohiim... Clearfix pada css biasanya digunakan untuk menangani posisi elemen saat menggunakan float, dimana float…

3 months ago

Fix npx atau npm tidak jalan di windows

Bismillaahirrohmaanirrohiim... Setelah menginstall node.js dan ingin menggunakan perintah npx atau npm di power shell atau…

3 months ago