DDM 20211102

package com.joythis.android.passwordgenerator;

import android.app.Activity;
import android.view.Gravity;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Random;

public class AmUtil {
    private Activity mA;

    public AmUtil(Activity pA){
        this.mA = pA;
    }//AmUtil

    public void fb  (String pStrMsg){
        Toast t = Toast.makeText(
        this.mA,
            pStrMsg,
            Toast.LENGTH_SHORT
        );

        t.setGravity(Gravity.CENTER, 0, 0);

        t.show();
    }//fb

    //tools related to randomness
    public static int randomInt(int pMin, int pMax){
        Random r = new Random();
        int iAmplitude = pMax-pMin+1;
        int iJump = r.nextInt(iAmplitude);
        int iDestination = pMin + iJump;
        return iDestination;
    }//randomInt

    public static char random_az(){
        int code_a = (int)'a';
        int code_z = (int)'z';
        int codeRandom = randomInt(code_a, code_z);
        char letterRandom = (char)codeRandom;
        return letterRandom;
    }//random_az

    public static char random_AZ(){
        int code_A = (int)'A';
        int code_Z = (int)'Z';
        int codeRandom = randomInt(code_A, code_Z);
        char letterRandom = (char)codeRandom;
        return letterRandom;
    }//random_AZ

    public static char random_09(){
        int code_0 = (int)'0';
        int code_9 = (int)'9';
        int codeRandom = randomInt(code_0, code_9);
        char letterRandom = (char)codeRandom;
        return letterRandom;
    }//random_09

    public static char randomSymbol(char pS1, char pS2){
        int code_s1 = (int)pS1;
        int code_s2 = (int)pS2;
        int codeRandom = randomInt(code_s1, code_s2);
        char letterRandom = (char)codeRandom;
        return letterRandom;
    }//randomSymbol

    public static char rAZ(){return randomSymbol('A', 'Z');}
    public static char raz(){return randomSymbol('a', 'z');}
    public static char r09(){return randomSymbol('0', '9');}

    /*
    ["*", "?", ":"]
     */
    public static char randomSpecialSymbol(
        ArrayList<String> pAlAcceptableSpecialSymbols
    ){
        int iHowMany = pAlAcceptableSpecialSymbols.size();
        int iRandomAddress = randomInt(0, iHowMany-1);
        String strRandomSymbol =
                pAlAcceptableSpecialSymbols.get(iRandomAddress);
        return strRandomSymbol.charAt(0);
    }//randomSpecialSymbol
}//AmUtil

********************


package com.joythis.android.passwordgenerator;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SeekBar;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    //data members
    CheckBox mCbAZ, mCbaz, mCbDigits;
    EditText mEtSS; //for the Special Symbols
    SeekBar mSbLength; //for the password length / size
    Button mBtnGenPass;
    ListView mLvPasswords;
    ArrayList<String> mAlPasswords;
    ArrayAdapter<String> mAd;

    Context mContext;

    View.OnClickListener mClickHandler = new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }//onClick
    };//mClickHandler

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rl_pass_gen_v1);

        init(savedInstanceState);
    }//onCreate

    void init (Bundle pB){
        //bindings
        mContext = this;
        //mContext = MainActivity.this;

        mCbaz = findViewById(R.id.idCbaz);
        mCbAZ = findViewById(R.id.idCbAZ);
        mCbDigits = findViewById(R.id.idCbDigits);
        mEtSS = findViewById(R.id.idEtSS);
        mSbLength = findViewById(R.id.idSbLength);
        mBtnGenPass = findViewById(R.id.idBtnGenPass);
        mLvPasswords = findViewById(R.id.idLvPasswords);

        if (mLvPasswords!=null){
            //data source + adapter
            mAlPasswords = new ArrayList<>();
            mAd = new ArrayAdapter<>(
                mContext,
                android.R.layout.simple_list_item_1,
                mAlPasswords
            );
            mLvPasswords.setAdapter(mAd);
        }//if (ListView pattern)

        //behaviors
    }//init


}